/*
This file is part of GNUnet.
- (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2001-2013 GNUnet e.V.
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 2, or (at your
- option) any later version.
+ GNUnet is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Affero General Public License as published
+ by the Free Software Foundation, either version 3 of the License,
+ or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Affero General Public License for more details.
*/
/**
* @author Gerd Knorr <kraxel@bytesex.org>
* @author Ioana Patrascu
* @author Tzvetan Horozov
+ * @author Jeffrey Burdges <burdges@gnunet.org>
+ *
+ * @defgroup crypto Crypto library: cryptographic operations
+ * Provides cryptographic primitives.
+ *
+ * @see [Documentation](https://gnunet.org/crypto-api)
+ *
+ * @defgroup hash Crypto library: hash operations
+ * Provides hashing and operations on hashes.
+ *
+ * @see [Documentation](https://gnunet.org/crypto-api)
*/
#ifndef GNUNET_CRYPTO_LIB_H
#endif
#endif
+/**
+ * @brief A 512-bit hashcode. These are the default length for GNUnet, using SHA-512.
+ */
+struct GNUNET_HashCode
+{
+ uint32_t bits[512 / 8 / sizeof (uint32_t)]; /* = 16 */
+};
+
+
+
+/**
+ * @brief A 256-bit hashcode. Used under special conditions, like when space
+ * is critical and security is not impacted by it.
+ */
+struct GNUNET_ShortHashCode
+{
+ uint32_t bits[256 / 8 / sizeof (uint32_t)]; /* = 8 */
+};
+
+
+/**
+ * The identity of the host (wraps the signing key of the peer).
+ */
+struct GNUNET_PeerIdentity;
+
#include "gnunet_common.h"
-#include "gnunet_scheduler_lib.h"
+#include <gcrypt.h>
+
+
+/**
+ * Maximum length of an ECC signature.
+ * Note: round up to multiple of 8 minus 2 for alignment.
+ */
+#define GNUNET_CRYPTO_ECC_SIGNATURE_DATA_ENCODING_LENGTH 126
+
/**
- * Desired quality level for cryptographic operations.
+ * Desired quality level for random numbers.
+ * @ingroup crypto
*/
enum GNUNET_CRYPTO_Quality
{
/**
* No good quality of the operation is needed (i.e.,
* random numbers can be pseudo-random).
+ * @ingroup crypto
*/
GNUNET_CRYPTO_QUALITY_WEAK,
/**
* High-quality operations are desired.
+ * @ingroup crypto
*/
GNUNET_CRYPTO_QUALITY_STRONG,
/**
* Randomness for IVs etc. is required.
+ * @ingroup crypto
*/
GNUNET_CRYPTO_QUALITY_NONCE
};
*/
#define GNUNET_CRYPTO_AES_KEY_LENGTH (256/8)
-
-/**
- * @brief Length of RSA encrypted data (2048 bit)
- *
- * We currently do not handle encryption of data
- * that can not be done in a single call to the
- * RSA methods (read: large chunks of data).
- * We should never need that, as we can use
- * the GNUNET_CRYPTO_hash for larger pieces of data for signing,
- * and for encryption, we only need to encode sessionkeys!
- */
-#define GNUNET_CRYPTO_RSA_DATA_ENCODING_LENGTH 256
-
-
-/**
- * Length of an RSA KEY (d,e,len), 2048 bit (=256 octests) key d, 2 byte e
- */
-#define GNUNET_CRYPTO_RSA_KEY_LENGTH 258
-
-
/**
* Length of a hash value
*/
-#define GNUNET_CRYPTO_HASH_LENGTH 512/8
+#define GNUNET_CRYPTO_HASH_LENGTH (512/8)
/**
- * The private information of an RSA key pair.
+ * How many characters (without 0-terminator) are our ASCII-encoded
+ * public keys (ECDSA/EDDSA/ECDHE).
*/
-struct GNUNET_CRYPTO_RsaPrivateKey;
-
+#define GNUNET_CRYPTO_PKEY_ASCII_LENGTH 52
/**
- * @brief 0-terminated ASCII encoding of a GNUNET_HashCode.
+ * @brief 0-terminated ASCII encoding of a struct GNUNET_HashCode.
*/
struct GNUNET_CRYPTO_HashAsciiEncoded
{
};
-
-/**
- * @brief an RSA signature
- */
-struct GNUNET_CRYPTO_RsaSignature
-{
- unsigned char sig[GNUNET_CRYPTO_RSA_DATA_ENCODING_LENGTH];
-};
+GNUNET_NETWORK_STRUCT_BEGIN
/**
- * @brief header of what an RSA signature signs
+ * @brief header of what an ECC signature signs
* this must be followed by "size - 8" bytes of
* the actual signed data
*/
-struct GNUNET_CRYPTO_RsaSignaturePurpose
+struct GNUNET_CRYPTO_EccSignaturePurpose
{
/**
* How many bytes does this signature sign?
/**
- * @brief A public key.
+ * @brief an ECC signature using EdDSA.
+ * See https://gnunet.org/ed25519
+ */
+struct GNUNET_CRYPTO_EddsaSignature
+{
+
+ /**
+ * R value.
+ */
+ unsigned char r[256 / 8];
+
+ /**
+ * S value.
+ */
+ unsigned char s[256 / 8];
+
+};
+
+
+
+/**
+ * @brief an ECC signature using ECDSA
+ */
+struct GNUNET_CRYPTO_EcdsaSignature
+{
+
+ /**
+ * R value.
+ */
+ unsigned char r[256 / 8];
+
+ /**
+ * S value.
+ */
+ unsigned char s[256 / 8];
+
+};
+
+
+/**
+ * Public ECC key (always for Curve25519) encoded in a format suitable
+ * for network transmission and EdDSA signatures.
*/
-struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
+struct GNUNET_CRYPTO_EddsaPublicKey
{
/**
- * In big-endian, must be GNUNET_CRYPTO_RSA_KEY_LENGTH+4
+ * Q consists of an x- and a y-value, each mod p (256 bits), given
+ * here in affine coordinates and Ed25519 standard compact format.
*/
- uint16_t len GNUNET_PACKED;
+ unsigned char q_y[256 / 8];
+};
+
+
+/**
+ * Public ECC key (always for Curve25519) encoded in a format suitable
+ * for network transmission and ECDSA signatures.
+ */
+struct GNUNET_CRYPTO_EcdsaPublicKey
+{
/**
- * Size of n in key; in big-endian!
+ * Q consists of an x- and a y-value, each mod p (256 bits), given
+ * here in affine coordinates and Ed25519 standard compact format.
*/
- uint16_t sizen GNUNET_PACKED;
+ unsigned char q_y[256 / 8];
+
+};
+
+/**
+ * The identity of the host (wraps the signing key of the peer).
+ */
+struct GNUNET_PeerIdentity
+{
+ struct GNUNET_CRYPTO_EddsaPublicKey public_key;
+};
+
+
+/**
+ * Public ECC key (always for Curve25519) encoded in a format suitable
+ * for network transmission and encryption (ECDH),
+ * See http://cr.yp.to/ecdh.html
+ */
+struct GNUNET_CRYPTO_EcdhePublicKey
+{
/**
- * The key itself, contains n followed by e.
+ * Q consists of an x- and a y-value, each mod p (256 bits), given
+ * here in affine coordinates and Ed25519 standard compact format.
*/
- unsigned char key[GNUNET_CRYPTO_RSA_KEY_LENGTH];
+ unsigned char q_y[256 / 8];
+};
+
+/**
+ * Private ECC key encoded for transmission. To be used only for ECDH
+ * key exchange (ECDHE to be precise).
+ */
+struct GNUNET_CRYPTO_EcdhePrivateKey
+{
/**
- * Padding (must be 0)
+ * d is a value mod n, where n has at most 256 bits.
*/
- uint16_t padding GNUNET_PACKED;
+ unsigned char d[256 / 8];
+
};
+/**
+ * Private ECC key encoded for transmission. To be used only for ECDSA
+ * signatures.
+ */
+struct GNUNET_CRYPTO_EcdsaPrivateKey
+{
+ /**
+ * d is a value mod n, where n has at most 256 bits.
+ */
+ unsigned char d[256 / 8];
+
+};
/**
- * RSA Encrypted data.
+ * Private ECC key encoded for transmission. To be used only for EdDSA
+ * signatures.
*/
-struct GNUNET_CRYPTO_RsaEncryptedData
+struct GNUNET_CRYPTO_EddsaPrivateKey
{
- unsigned char encoding[GNUNET_CRYPTO_RSA_DATA_ENCODING_LENGTH];
+ /**
+ * d is a value mod n, where n has at most 256 bits.
+ */
+ unsigned char d[256 / 8];
+
};
/**
* @brief type for session keys
*/
-struct GNUNET_CRYPTO_AesSessionKey
+struct GNUNET_CRYPTO_SymmetricSessionKey
{
/**
- * Actual key.
+ * Actual key for AES.
*/
- unsigned char key[GNUNET_CRYPTO_AES_KEY_LENGTH];
+ unsigned char aes_key[GNUNET_CRYPTO_AES_KEY_LENGTH];
/**
- * checksum!
+ * Actual key for TwoFish.
*/
- uint32_t crc32 GNUNET_PACKED;
+ unsigned char twofish_key[GNUNET_CRYPTO_AES_KEY_LENGTH];
+
};
+GNUNET_NETWORK_STRUCT_END
/**
* @brief IV for sym cipher
*
* NOTE: must be smaller (!) in size than the
- * GNUNET_HashCode.
+ * `struct GNUNET_HashCode`.
*/
-struct GNUNET_CRYPTO_AesInitializationVector
+struct GNUNET_CRYPTO_SymmetricInitializationVector
{
- unsigned char iv[GNUNET_CRYPTO_AES_KEY_LENGTH / 2];
+ unsigned char aes_iv[GNUNET_CRYPTO_AES_KEY_LENGTH / 2];
+
+ unsigned char twofish_iv[GNUNET_CRYPTO_AES_KEY_LENGTH / 2];
};
};
+/**
+ * Size of paillier plain texts and public keys.
+ * Private keys and ciphertexts are twice this size.
+ */
+#define GNUNET_CRYPTO_PAILLIER_BITS 2048
+
+
+/**
+ * Paillier public key.
+ */
+struct GNUNET_CRYPTO_PaillierPublicKey
+{
+ /**
+ * N value.
+ */
+ unsigned char n[GNUNET_CRYPTO_PAILLIER_BITS / 8];
+};
+
+
+/**
+ * Paillier private key.
+ */
+struct GNUNET_CRYPTO_PaillierPrivateKey
+{
+ /**
+ * Lambda-component of the private key.
+ */
+ unsigned char lambda[GNUNET_CRYPTO_PAILLIER_BITS / 8];
+ /**
+ * Mu-component of the private key.
+ */
+ unsigned char mu[GNUNET_CRYPTO_PAILLIER_BITS / 8];
+};
+
+
+/**
+ * Paillier ciphertext.
+ */
+struct GNUNET_CRYPTO_PaillierCiphertext
+{
+ /**
+ * Guaranteed minimum number of homomorphic operations with this ciphertext,
+ * in network byte order (NBO).
+ */
+ int32_t remaining_ops GNUNET_PACKED;
+
+ /**
+ * The bits of the ciphertext.
+ */
+ unsigned char bits[GNUNET_CRYPTO_PAILLIER_BITS * 2 / 8];
+};
+
+
/* **************** Functions and Macros ************* */
+/**
+ * @ingroup crypto
+ * Seed a weak random generator. Only #GNUNET_CRYPTO_QUALITY_WEAK-mode generator
+ * can be seeded.
+ *
+ * @param seed the seed to use
+ */
+void
+GNUNET_CRYPTO_seed_weak_random (int32_t seed);
+
+
+/**
+ * @ingroup hash
+ * Calculate the checksum of a buffer in one step.
+ *
+ * @param buf buffer to calculate CRC over
+ * @param len number of bytes in @a buf
+ * @return crc8 value
+ */
+uint8_t
+GNUNET_CRYPTO_crc8_n (const void *buf,
+ size_t len);
+
+
+/**
+ * Perform an incremental step in a CRC16 (for TCP/IP) calculation.
+ *
+ * @param sum current sum, initially 0
+ * @param buf buffer to calculate CRC over (must be 16-bit aligned)
+ * @param len number of bytes in @a buf, must be multiple of 2
+ * @return updated crc sum (must be subjected to #GNUNET_CRYPTO_crc16_finish to get actual crc16)
+ */
+uint32_t
+GNUNET_CRYPTO_crc16_step (uint32_t sum,
+ const void *buf,
+ size_t len);
+
+
+/**
+ * Convert results from GNUNET_CRYPTO_crc16_step to final crc16.
+ *
+ * @param sum cummulative sum
+ * @return crc16 value
+ */
+uint16_t
+GNUNET_CRYPTO_crc16_finish (uint32_t sum);
+
+
+/**
+ * @ingroup hash
+ * Calculate the checksum of a buffer in one step.
+ *
+ * @param buf buffer to calculate CRC over (must be 16-bit aligned)
+ * @param len number of bytes in @a buf, must be multiple of 2
+ * @return crc16 value
+ */
+uint16_t
+GNUNET_CRYPTO_crc16_n (const void *buf,
+ size_t len);
+
+
+
/**
+ * @ingroup hash
* Compute the CRC32 checksum for the first len
* bytes of the buffer.
*
* @param buf the data over which we're taking the CRC
- * @param len the length of the buffer in bytes
+ * @param len the length of the buffer @a buf in bytes
* @return the resulting CRC32 checksum
*/
-int32_t GNUNET_CRYPTO_crc32_n (const void *buf,
- size_t len);
+int32_t
+GNUNET_CRYPTO_crc32_n (const void *buf,
+ size_t len);
/**
+ * @ingroup crypto
+ * Fill block with a random values.
+ *
+ * @param mode desired quality of the random number
+ * @param buffer the buffer to fill
+ * @param length buffer length
+ */
+void
+GNUNET_CRYPTO_random_block (enum GNUNET_CRYPTO_Quality mode,
+ void *buffer,
+ size_t length);
+
+/**
+ * @ingroup crypto
* Produce a random value.
*
* @param mode desired quality of the random number
* @param i the upper limit (exclusive) for the random number
- * @return a random value in the interval [0,i) (exclusive).
+ * @return a random value in the interval [0,@a i) (exclusive).
*/
-uint32_t GNUNET_CRYPTO_random_u32 (enum GNUNET_CRYPTO_Quality mode,
- uint32_t i);
+uint32_t
+GNUNET_CRYPTO_random_u32 (enum GNUNET_CRYPTO_Quality mode,
+ uint32_t i);
/**
- * Random on unsigned 64-bit values.
+ * @ingroup crypto
+ * Random on unsigned 64-bit values.
*
* @param mode desired quality of the random number
- * @param max value returned will be in range [0,max) (exclusive)
+ * @param max value returned will be in range [0,@a max) (exclusive)
* @return random 64-bit number
*/
-uint64_t GNUNET_CRYPTO_random_u64 (enum GNUNET_CRYPTO_Quality mode,
- uint64_t max);
+uint64_t
+GNUNET_CRYPTO_random_u64 (enum GNUNET_CRYPTO_Quality mode,
+ uint64_t max);
/**
+ * @ingroup crypto
* Get an array with a random permutation of the
* numbers 0...n-1.
- * @param mode GNUNET_CRYPTO_QUALITY_STRONG if the strong (but expensive) PRNG should be used, GNUNET_CRYPTO_QUALITY_WEAK otherwise
+ * @param mode #GNUNET_CRYPTO_QUALITY_STRONG if the strong (but expensive) PRNG should be used,
+ * #GNUNET_CRYPTO_QUALITY_WEAK or #GNUNET_CRYPTO_QUALITY_NONCE otherwise
* @param n the size of the array
* @return the permutation array (allocated from heap)
*/
-unsigned int *GNUNET_CRYPTO_random_permute (enum GNUNET_CRYPTO_Quality mode,
- unsigned int n);
+unsigned int *
+GNUNET_CRYPTO_random_permute (enum GNUNET_CRYPTO_Quality mode,
+ unsigned int n);
/**
- * Create a new Session key.
+ * @ingroup crypto
+ * Create a new random session key.
*
* @param key key to initialize
*/
-void GNUNET_CRYPTO_aes_create_session_key (struct GNUNET_CRYPTO_AesSessionKey
- *key);
-
-/**
- * Check that a new session key is well-formed.
- *
- * @param key key to check
- * @return GNUNET_OK if the key is valid
- */
-int GNUNET_CRYPTO_aes_check_session_key (const struct
- GNUNET_CRYPTO_AesSessionKey *key);
+void
+GNUNET_CRYPTO_symmetric_create_session_key (struct GNUNET_CRYPTO_SymmetricSessionKey *key);
/**
- * Encrypt a block with the public key of another
- * host that uses the same cyper.
+ * @ingroup crypto
+ * Encrypt a block using a symmetric sessionkey.
*
* @param block the block to encrypt
- * @param len the size of the block
+ * @param size the size of the @a block
* @param sessionkey the key used to encrypt
* @param iv the initialization vector to use, use INITVALUE
* for streams.
* @return the size of the encrypted block, -1 for errors
*/
-ssize_t GNUNET_CRYPTO_aes_encrypt (const void *block,
- size_t len,
- const struct GNUNET_CRYPTO_AesSessionKey
- *sessionkey,
- const struct
- GNUNET_CRYPTO_AesInitializationVector *iv,
- void *result);
+ssize_t
+GNUNET_CRYPTO_symmetric_encrypt (const void *block,
+ size_t size,
+ const struct GNUNET_CRYPTO_SymmetricSessionKey *sessionkey,
+ const struct GNUNET_CRYPTO_SymmetricInitializationVector *iv,
+ void *result);
/**
- * Decrypt a given block with the sessionkey.
+ * @ingroup crypto
+ * Decrypt a given block using a symmetric sessionkey.
*
* @param block the data to decrypt, encoded as returned by encrypt
* @param size how big is the block?
* @param result address to store the result at
* @return -1 on failure, size of decrypted block on success
*/
-ssize_t GNUNET_CRYPTO_aes_decrypt (const void *block,
- size_t size,
- const struct GNUNET_CRYPTO_AesSessionKey *sessionkey,
- const struct GNUNET_CRYPTO_AesInitializationVector *iv,
- void *result);
+ssize_t
+GNUNET_CRYPTO_symmetric_decrypt (const void *block,
+ size_t size,
+ const struct GNUNET_CRYPTO_SymmetricSessionKey *sessionkey,
+ const struct GNUNET_CRYPTO_SymmetricInitializationVector *iv,
+ void *result);
/**
+ * @ingroup crypto
* @brief Derive an IV
* @param iv initialization vector
* @param skey session key
* @param salt salt for the derivation
- * @param salt_len size of the salt
+ * @param salt_len size of the @a salt
* @param ... pairs of void * & size_t for context chunks, terminated by NULL
*/
void
-GNUNET_CRYPTO_aes_derive_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
- const struct GNUNET_CRYPTO_AesSessionKey *skey,
- const void *salt, size_t salt_len,
- ...);
+GNUNET_CRYPTO_symmetric_derive_iv (struct GNUNET_CRYPTO_SymmetricInitializationVector *iv,
+ const struct GNUNET_CRYPTO_SymmetricSessionKey *skey,
+ const void *salt,
+ size_t salt_len, ...);
/**
* @param iv initialization vector
* @param skey session key
* @param salt salt for the derivation
- * @param salt_len size of the salt
+ * @param salt_len size of the @a salt
* @param argp pairs of void * & size_t for context chunks, terminated by NULL
*/
void
-GNUNET_CRYPTO_aes_derive_iv_v (struct GNUNET_CRYPTO_AesInitializationVector *iv,
- const struct GNUNET_CRYPTO_AesSessionKey *skey,
- const void *salt, size_t salt_len,
- va_list argp);
+GNUNET_CRYPTO_symmetric_derive_iv_v (struct GNUNET_CRYPTO_SymmetricInitializationVector *iv,
+ const struct GNUNET_CRYPTO_SymmetricSessionKey *skey,
+ const void *salt,
+ size_t salt_len,
+ va_list argp);
/**
+ * @ingroup hash
* Convert hash to ASCII encoding.
* @param block the hash code
* @param result where to store the encoding (struct GNUNET_CRYPTO_HashAsciiEncoded can be
* safely cast to char*, a '\\0' termination is set).
*/
-void GNUNET_CRYPTO_hash_to_enc (const GNUNET_HashCode * block,
- struct GNUNET_CRYPTO_HashAsciiEncoded
- *result);
+void
+GNUNET_CRYPTO_hash_to_enc (const struct GNUNET_HashCode *block,
+ struct GNUNET_CRYPTO_HashAsciiEncoded *result);
+
+
+/**
+ * @ingroup hash
+ * Convert ASCII encoding back to a 'struct GNUNET_HashCode'
+ *
+ * @param enc the encoding
+ * @param enclen number of characters in @a enc (without 0-terminator, which can be missing)
+ * @param result where to store the hash code
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR if result has the wrong encoding
+ */
+int
+GNUNET_CRYPTO_hash_from_string2 (const char *enc,
+ size_t enclen,
+ struct GNUNET_HashCode *result);
/**
- * Convert ASCII encoding back to GNUNET_CRYPTO_hash
+ * @ingroup hash
+ * Convert ASCII encoding back to `struct GNUNET_HashCode`
+ *
* @param enc the encoding
- * @param result where to store the GNUNET_CRYPTO_hash code
- * @return GNUNET_OK on success, GNUNET_SYSERR if result has the wrong encoding
+ * @param result where to store the hash code
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR if result has the wrong encoding
*/
-int GNUNET_CRYPTO_hash_from_string (const char *enc,
- GNUNET_HashCode * result);
+#define GNUNET_CRYPTO_hash_from_string(enc, result) \
+ GNUNET_CRYPTO_hash_from_string2 (enc, strlen(enc), result)
/**
- * Compute the distance between 2 hashcodes.
- * The computation must be fast, not involve
- * a.a or a.e (they're used elsewhere), and
- * be somewhat consistent. And of course, the
- * result should be a positive number.
+ * @ingroup hash
+ *
+ * Compute the distance between 2 hashcodes. The
+ * computation must be fast, not involve @a a[0] or @a a[4] (they're used
+ * elsewhere), and be somewhat consistent. And of course, the result
+ * should be a positive number.
*
* @param a some hash code
* @param b some hash code
* @return number between 0 and UINT32_MAX
*/
-uint32_t GNUNET_CRYPTO_hash_distance_u32 (const GNUNET_HashCode * a,
- const GNUNET_HashCode * b);
+uint32_t
+GNUNET_CRYPTO_hash_distance_u32 (const struct GNUNET_HashCode *a,
+ const struct GNUNET_HashCode *b);
/**
+ * @ingroup hash
* Compute hash of a given block.
*
* @param block the data to hash
- * @param size size of the block
+ * @param size size of the @a block
* @param ret pointer to where to write the hashcode
*/
-void GNUNET_CRYPTO_hash (const void *block,
- size_t size,
- GNUNET_HashCode * ret);
+void
+GNUNET_CRYPTO_hash (const void *block,
+ size_t size,
+ struct GNUNET_HashCode *ret);
+
+
+/**
+ * Context for cummulative hashing.
+ */
+struct GNUNET_HashContext;
+
+
+/**
+ * Start incremental hashing operation.
+ *
+ * @return context for incremental hash computation
+ */
+struct GNUNET_HashContext *
+GNUNET_CRYPTO_hash_context_start (void);
+
+
+/**
+ * Add data to be hashed.
+ *
+ * @param hc cummulative hash context
+ * @param buf data to add
+ * @param size number of bytes in @a buf
+ */
+void
+GNUNET_CRYPTO_hash_context_read (struct GNUNET_HashContext *hc,
+ const void *buf,
+ size_t size);
+
+
+/**
+ * Finish the hash computation.
+ *
+ * @param hc hash context to use, is freed in the process
+ * @param r_hash where to write the latest / final hash code
+ */
+void
+GNUNET_CRYPTO_hash_context_finish (struct GNUNET_HashContext *hc,
+ struct GNUNET_HashCode *r_hash);
+
+
+/**
+ * Abort hashing, do not bother calculating final result.
+ *
+ * @param hc hash context to destroy
+ */
+void
+GNUNET_CRYPTO_hash_context_abort (struct GNUNET_HashContext *hc);
/**
+ * @ingroup hash
* Calculate HMAC of a message (RFC 2104)
*
* @param key secret key
* @param plaintext input plaintext
- * @param plaintext_len length of plaintext
+ * @param plaintext_len length of @a plaintext
* @param hmac where to store the hmac
*/
-void
+void
GNUNET_CRYPTO_hmac (const struct GNUNET_CRYPTO_AuthKey *key,
- const void *plaintext,
- size_t plaintext_len,
- GNUNET_HashCode *hmac);
+ const void *plaintext,
+ size_t plaintext_len,
+ struct GNUNET_HashCode *hmac);
/**
* @param cls closure
* @param res resulting hash, NULL on error
*/
-typedef void (*GNUNET_CRYPTO_HashCompletedCallback) (void *cls,
- const GNUNET_HashCode *
- res);
+typedef void
+(*GNUNET_CRYPTO_HashCompletedCallback) (void *cls,
+ const struct GNUNET_HashCode *res);
/**
*/
struct GNUNET_CRYPTO_FileHashContext;
+
/**
+ * @ingroup hash
* Compute the hash of an entire file.
*
* @param priority scheduling priority to use
* @param filename name of file to hash
* @param blocksize number of bytes to process in one task
* @param callback function to call upon completion
- * @param callback_cls closure for callback
+ * @param callback_cls closure for @a callback
* @return NULL on (immediate) errror
*/
struct GNUNET_CRYPTO_FileHashContext *
GNUNET_CRYPTO_hash_file (enum GNUNET_SCHEDULER_Priority priority,
- const char *filename,
- size_t blocksize,
- GNUNET_CRYPTO_HashCompletedCallback callback,
- void *callback_cls);
+ const char *filename,
+ size_t blocksize,
+ GNUNET_CRYPTO_HashCompletedCallback callback,
+ void *callback_cls);
/**
/**
+ * @ingroup hash
* Create a random hash code.
*
* @param mode desired quality level
* @param result hash code that is randomized
*/
-void GNUNET_CRYPTO_hash_create_random (enum GNUNET_CRYPTO_Quality mode,
- GNUNET_HashCode * result);
+void
+GNUNET_CRYPTO_hash_create_random (enum GNUNET_CRYPTO_Quality mode,
+ struct GNUNET_HashCode *result);
/**
- * compute result(delta) = b - a
+ * @ingroup hash
+ * compute @a result = @a b - @a a
*
* @param a some hash code
* @param b some hash code
- * @param result set to b - a
+ * @param result set to @a b - @a a
*/
-void GNUNET_CRYPTO_hash_difference (const GNUNET_HashCode * a,
- const GNUNET_HashCode * b,
- GNUNET_HashCode * result);
+void
+GNUNET_CRYPTO_hash_difference (const struct GNUNET_HashCode *a,
+ const struct GNUNET_HashCode *b,
+ struct GNUNET_HashCode *result);
/**
- * compute result(b) = a + delta
+ * @ingroup hash
+ * compute @a result = @a a + @a delta
*
* @param a some hash code
* @param delta some hash code
- * @param result set to a + delta
+ * @param result set to @a a + @a delta
*/
-void GNUNET_CRYPTO_hash_sum (const GNUNET_HashCode * a,
- const GNUNET_HashCode * delta,
- GNUNET_HashCode * result);
+void
+GNUNET_CRYPTO_hash_sum (const struct GNUNET_HashCode *a,
+ const struct GNUNET_HashCode *delta,
+ struct GNUNET_HashCode *result);
/**
+ * @ingroup hash
* compute result = a ^ b
*
* @param a some hash code
* @param b some hash code
- * @param result set to a ^ b
+ * @param result set to @a a ^ @a b
*/
-void GNUNET_CRYPTO_hash_xor (const GNUNET_HashCode * a,
- const GNUNET_HashCode * b,
- GNUNET_HashCode * result);
+void
+GNUNET_CRYPTO_hash_xor (const struct GNUNET_HashCode *a,
+ const struct GNUNET_HashCode *b,
+ struct GNUNET_HashCode *result);
/**
+ * @ingroup hash
* Convert a hashcode into a key.
*
* @param hc hash code that serves to generate the key
* @param skey set to a valid session key
* @param iv set to a valid initialization vector
*/
-void GNUNET_CRYPTO_hash_to_aes_key (const GNUNET_HashCode * hc,
- struct GNUNET_CRYPTO_AesSessionKey *skey,
- struct
- GNUNET_CRYPTO_AesInitializationVector
- *iv);
+void
+GNUNET_CRYPTO_hash_to_aes_key (const struct GNUNET_HashCode * hc,
+ struct GNUNET_CRYPTO_SymmetricSessionKey *skey,
+ struct GNUNET_CRYPTO_SymmetricInitializationVector *iv);
/**
+ * @ingroup hash
* Obtain a bit from a hashcode.
*
- * @param code the GNUNET_CRYPTO_hash to index bit-wise
+ * @param code the `struct GNUNET_HashCode` to index bit-wise
* @param bit index into the hashcode, [0...159]
* @return Bit \a bit from hashcode \a code, -1 for invalid index
*/
-int GNUNET_CRYPTO_hash_get_bit (const GNUNET_HashCode * code,
- unsigned int bit);
+int
+GNUNET_CRYPTO_hash_get_bit (const struct GNUNET_HashCode *code,
+ unsigned int bit);
+
/**
+ * @ingroup hash
* Determine how many low order bits match in two
- * GNUNET_HashCodes. i.e. - 010011 and 011111 share
+ * `struct GNUNET_HashCodes`. i.e. - 010011 and 011111 share
* the first two lowest order bits, and therefore the
* return value is two (NOT XOR distance, nor how many
* bits match absolutely!).
*
* @param first the first hashcode
* @param second the hashcode to compare first to
- *
* @return the number of bits that match
*/
-unsigned int GNUNET_CRYPTO_hash_matching_bits(const GNUNET_HashCode *first, const GNUNET_HashCode *second);
+unsigned int
+GNUNET_CRYPTO_hash_matching_bits (const struct GNUNET_HashCode *first,
+ const struct GNUNET_HashCode *second);
/**
+ * @ingroup hash
* Compare function for HashCodes, producing a total ordering
* of all hashcodes.
*
* @param h1 some hash code
* @param h2 some hash code
- * @return 1 if h1 > h2, -1 if h1 < h2 and 0 if h1 == h2.
+ * @return 1 if @a h1 > @a h2, -1 if @a h1 < @a h2 and 0 if @a h1 == @a h2.
*/
-int GNUNET_CRYPTO_hash_cmp (const GNUNET_HashCode * h1,
- const GNUNET_HashCode * h2);
+int
+GNUNET_CRYPTO_hash_cmp (const struct GNUNET_HashCode *h1,
+ const struct GNUNET_HashCode *h2);
/**
+ * @ingroup hash
* Find out which of the two GNUNET_CRYPTO_hash codes is closer to target
* in the XOR metric (Kademlia).
*
* @param h1 some hash code
* @param h2 some hash code
* @param target some hash code
- * @return -1 if h1 is closer, 1 if h2 is closer and 0 if h1==h2.
+ * @return -1 if @a h1 is closer, 1 if @a h2 is closer and 0 if @a h1== @a h2.
*/
-int GNUNET_CRYPTO_hash_xorcmp (const GNUNET_HashCode * h1,
- const GNUNET_HashCode * h2,
- const GNUNET_HashCode * target);
+int
+GNUNET_CRYPTO_hash_xorcmp (const struct GNUNET_HashCode *h1,
+ const struct GNUNET_HashCode *h2,
+ const struct GNUNET_HashCode *target);
/**
+ * @ingroup hash
* @brief Derive an authentication key
* @param key authentication key
* @param rkey root key
* @param argp pair of void * & size_t for context chunks, terminated by NULL
*/
void
-GNUNET_CRYPTO_hmac_derive_key_v(struct GNUNET_CRYPTO_AuthKey *key,
- const struct GNUNET_CRYPTO_AesSessionKey *rkey,
- const void *salt,
- size_t salt_len,
- va_list argp);
+GNUNET_CRYPTO_hmac_derive_key_v (struct GNUNET_CRYPTO_AuthKey *key,
+ const struct GNUNET_CRYPTO_SymmetricSessionKey *rkey,
+ const void *salt, size_t salt_len,
+ va_list argp);
/**
+ * @ingroup hash
* @brief Derive an authentication key
* @param key authentication key
* @param rkey root key
* @param ... pair of void * & size_t for context chunks, terminated by NULL
*/
void
-GNUNET_CRYPTO_hmac_derive_key(struct GNUNET_CRYPTO_AuthKey *key,
- const struct GNUNET_CRYPTO_AesSessionKey *rkey,
- const void *salt,
- size_t salt_len,
- ...);
+GNUNET_CRYPTO_hmac_derive_key (struct GNUNET_CRYPTO_AuthKey *key,
+ const struct GNUNET_CRYPTO_SymmetricSessionKey *rkey,
+ const void *salt, size_t salt_len,
+ ...);
+
/**
+ * @ingroup hash
* @brief Derive key
* @param result buffer for the derived key, allocated by caller
* @param out_len desired length of the derived key
* @param xtr_algo hash algorithm for the extraction phase, GCRY_MD_...
* @param prf_algo hash algorithm for the expansion phase, GCRY_MD_...
* @param xts salt
- * @param xts_len length of xts
+ * @param xts_len length of @a xts
* @param skm source key material
- * @param skm_len length of skm
- * @return GNUNET_YES on success
+ * @param skm_len length of @a skm
+ * @param ... pair of void * & size_t for context chunks, terminated by NULL
+ * @return #GNUNET_YES on success
*/
int
-GNUNET_CRYPTO_hkdf (void *result,
- size_t out_len,
- int xtr_algo, int prf_algo,
- const void *xts, size_t xts_len,
- const void *skm, size_t skm_len,
- ...);
+GNUNET_CRYPTO_hkdf (void *result,
+ size_t out_len,
+ int xtr_algo,
+ int prf_algo,
+ const void *xts,
+ size_t xts_len,
+ const void *skm,
+ size_t skm_len,
+ ...);
/**
+ * @ingroup hash
* @brief Derive key
* @param result buffer for the derived key, allocated by caller
* @param out_len desired length of the derived key
* @param xtr_algo hash algorithm for the extraction phase, GCRY_MD_...
* @param prf_algo hash algorithm for the expansion phase, GCRY_MD_...
* @param xts salt
- * @param xts_len length of xts
+ * @param xts_len length of @a xts
* @param skm source key material
- * @param skm_len length of skm
+ * @param skm_len length of @a skm
* @param argp va_list of void * & size_t pairs for context chunks
- * @return GNUNET_YES on success
+ * @return #GNUNET_YES on success
*/
int
-GNUNET_CRYPTO_hkdf_v (void *result,
- size_t out_len,
- int xtr_algo,
- int prf_algo,
- const void *xts, size_t xts_len,
- const void *skm, size_t skm_len,
- va_list argp);
+GNUNET_CRYPTO_hkdf_v (void *result,
+ size_t out_len,
+ int xtr_algo,
+ int prf_algo,
+ const void *xts,
+ size_t xts_len,
+ const void *skm,
+ size_t skm_len,
+ va_list argp);
/**
* @param result buffer for the derived key, allocated by caller
* @param out_len desired length of the derived key
* @param xts salt
- * @param xts_len length of xts
+ * @param xts_len length of @a xts
* @param skm source key material
- * @param skm_len length of skm
+ * @param skm_len length of @a skm
* @param argp va_list of void * & size_t pairs for context chunks
- * @return GNUNET_YES on success
+ * @return #GNUNET_YES on success
*/
int
-GNUNET_CRYPTO_kdf_v (void *result,
- size_t out_len,
- const void *xts, size_t xts_len,
- const void *skm, size_t skm_len,
- va_list argp);
+GNUNET_CRYPTO_kdf_v (void *result,
+ size_t out_len,
+ const void *xts,
+ size_t xts_len,
+ const void *skm,
+ size_t skm_len,
+ va_list argp);
+
+
+/**
+ * Deterministically generate a pseudo-random number uniformly from the
+ * integers modulo a libgcrypt mpi.
+ *
+ * @param[out] r MPI value set to the FDH
+ * @param n MPI to work modulo
+ * @param xts salt
+ * @param xts_len length of @a xts
+ * @param skm source key material
+ * @param skm_len length of @a skm
+ * @param ctx context string
+ */
+void
+GNUNET_CRYPTO_kdf_mod_mpi (gcry_mpi_t *r,
+ gcry_mpi_t n,
+ const void *xts, size_t xts_len,
+ const void *skm, size_t skm_len,
+ const char *ctx);
/**
+ * @ingroup hash
* @brief Derive key
* @param result buffer for the derived key, allocated by caller
* @param out_len desired length of the derived key
* @param xts salt
- * @param xts_len length of xts
+ * @param xts_len length of @a xts
* @param skm source key material
- * @param skm_len length of skm
+ * @param skm_len length of @a skm
* @param ... void * & size_t pairs for context chunks
- * @return GNUNET_YES on success
+ * @return #GNUNET_YES on success
*/
int
-GNUNET_CRYPTO_kdf (void *result, size_t out_len,
- const void *xts, size_t xts_len, const void *skm,
- size_t skm_len, ...);
+GNUNET_CRYPTO_kdf (void *result,
+ size_t out_len,
+ const void *xts,
+ size_t xts_len,
+ const void *skm,
+ size_t skm_len,
+ ...);
/**
- * Create a new private key. Caller must free return value.
+ * @ingroup crypto
+ * Extract the public key for the given private key.
*
- * @return fresh private key
+ * @param priv the private key
+ * @param pub where to write the public key
*/
-struct GNUNET_CRYPTO_RsaPrivateKey *GNUNET_CRYPTO_rsa_key_create (void);
+void
+GNUNET_CRYPTO_ecdsa_key_get_public (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv,
+ struct GNUNET_CRYPTO_EcdsaPublicKey *pub);
/**
- * Create a new private key by reading it from a file. If the
- * files does not exist, create a new key and write it to the
- * file. Caller must free return value. Note that this function
- * can not guarantee that another process might not be trying
- * the same operation on the same file at the same time.
- * If the contents of the file
- * are invalid the old file is deleted and a fresh key is
- * created.
+ * @ingroup crypto
+ * Extract the public key for the given private key.
*
- * @param filename name of file to use for storage
- * @return new private key, NULL on error (for example,
- * permission denied)
+ * @param priv the private key
+ * @param pub where to write the public key
*/
-struct GNUNET_CRYPTO_RsaPrivateKey
- *GNUNET_CRYPTO_rsa_key_create_from_file (const char *filename);
+void
+GNUNET_CRYPTO_eddsa_key_get_public (const struct GNUNET_CRYPTO_EddsaPrivateKey *priv,
+ struct GNUNET_CRYPTO_EddsaPublicKey *pub);
+
/**
- * Deterministically (!) create a private key using only the
- * given HashCode as input to the PRNG.
+ * @ingroup crypto
+ * Extract the public key for the given private key.
*
- * @param hc "random" input to PRNG
- * @return some private key purely dependent on input
+ * @param priv the private key
+ * @param pub where to write the public key
*/
-struct GNUNET_CRYPTO_RsaPrivateKey
- *GNUNET_CRYPTO_rsa_key_create_from_hash (const GNUNET_HashCode * hc);
+void
+GNUNET_CRYPTO_ecdhe_key_get_public (const struct GNUNET_CRYPTO_EcdhePrivateKey *priv,
+ struct GNUNET_CRYPTO_EcdhePublicKey *pub);
/**
- * Free memory occupied by the private key.
- * @param hostkey pointer to the memory to free
+ * Convert a public key to a string.
+ *
+ * @param pub key to convert
+ * @return string representing @a pub
*/
-void GNUNET_CRYPTO_rsa_key_free (struct GNUNET_CRYPTO_RsaPrivateKey *hostkey);
+char *
+GNUNET_CRYPTO_ecdsa_public_key_to_string (const struct GNUNET_CRYPTO_EcdsaPublicKey *pub);
/**
- * Extract the public key of the host.
+ * Convert a private key to a string.
*
- * @param priv the private key
- * @param pub where to write the public key
+ * @param priv key to convert
+ * @return string representing @a pub
*/
-void GNUNET_CRYPTO_rsa_key_get_public (const struct
- GNUNET_CRYPTO_RsaPrivateKey *priv,
- struct
- GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
- *pub);
+char *
+GNUNET_CRYPTO_eddsa_private_key_to_string (const struct GNUNET_CRYPTO_EddsaPrivateKey *priv);
/**
- * Encrypt a block with the public key of another host that uses the
- * same cyper.
+ * Convert a public key to a string.
*
- * @param block the block to encrypt
- * @param size the size of block
- * @param publicKey the encoded public key used to encrypt
- * @param target where to store the encrypted block
- * @return GNUNET_SYSERR on error, GNUNET_OK if ok
+ * @param pub key to convert
+ * @return string representing @a pub
*/
-int GNUNET_CRYPTO_rsa_encrypt (const void *block,
- size_t size,
- const struct
- GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
- *publicKey,
- struct GNUNET_CRYPTO_RsaEncryptedData *target);
+char *
+GNUNET_CRYPTO_eddsa_public_key_to_string (const struct GNUNET_CRYPTO_EddsaPublicKey *pub);
/**
- * Decrypt a given block with the hostkey.
+ * Convert a string representing a public key to a public key.
*
- * @param key the key to use
- * @param block the data to decrypt, encoded as returned by encrypt, not consumed
- * @param result pointer to a location where the result can be stored
- * @param max how many bytes of a result are expected? Must be exact.
- * @return the size of the decrypted block (that is, size) or -1 on error
+ * @param enc encoded public key
+ * @param enclen number of bytes in @a enc (without 0-terminator)
+ * @param pub where to store the public key
+ * @return #GNUNET_OK on success
*/
-ssize_t GNUNET_CRYPTO_rsa_decrypt (const struct GNUNET_CRYPTO_RsaPrivateKey *key,
- const struct GNUNET_CRYPTO_RsaEncryptedData
- *block,
- void *result,
- size_t max);
+int
+GNUNET_CRYPTO_ecdsa_public_key_from_string (const char *enc,
+ size_t enclen,
+ struct GNUNET_CRYPTO_EcdsaPublicKey *pub);
/**
- * Sign a given block.
+ * Convert a string representing a private key to a private key.
*
- * @param key private key to use for the signing
+ * @param enc encoded public key
+ * @param enclen number of bytes in @a enc (without 0-terminator)
+ * @param priv where to store the private key
+ * @return #GNUNET_OK on success
+ */
+int
+GNUNET_CRYPTO_eddsa_private_key_from_string (const char *enc,
+ size_t enclen,
+ struct GNUNET_CRYPTO_EddsaPrivateKey *pub);
+
+
+/**
+ * Convert a string representing a public key to a public key.
+ *
+ * @param enc encoded public key
+ * @param enclen number of bytes in @a enc (without 0-terminator)
+ * @param pub where to store the public key
+ * @return #GNUNET_OK on success
+ */
+int
+GNUNET_CRYPTO_eddsa_public_key_from_string (const char *enc,
+ size_t enclen,
+ struct GNUNET_CRYPTO_EddsaPublicKey *pub);
+
+
+/**
+ * @ingroup crypto
+ * Create a new private key by reading it from a file. If the
+ * files does not exist, create a new key and write it to the
+ * file. Caller must free return value. Note that this function
+ * can not guarantee that another process might not be trying
+ * the same operation on the same file at the same time.
+ * If the contents of the file
+ * are invalid the old file is deleted and a fresh key is
+ * created.
+ *
+ * @param filename name of file to use to store the key
+ * @return new private key, NULL on error (for example,
+ * permission denied); free using #GNUNET_free
+ */
+struct GNUNET_CRYPTO_EcdsaPrivateKey *
+GNUNET_CRYPTO_ecdsa_key_create_from_file (const char *filename);
+
+
+/**
+ * @ingroup crypto
+ * Create a new private key by reading it from a file. If the
+ * files does not exist, create a new key and write it to the
+ * file. Caller must free return value. Note that this function
+ * can not guarantee that another process might not be trying
+ * the same operation on the same file at the same time.
+ * If the contents of the file
+ * are invalid the old file is deleted and a fresh key is
+ * created.
+ *
+ * @param filename name of file to use to store the key
+ * @return new private key, NULL on error (for example,
+ * permission denied); free using #GNUNET_free
+ */
+struct GNUNET_CRYPTO_EddsaPrivateKey *
+GNUNET_CRYPTO_eddsa_key_create_from_file (const char *filename);
+
+
+/**
+ * Forward declaration to simplify #include-structure.
+ */
+struct GNUNET_CONFIGURATION_Handle;
+
+
+/**
+ * @ingroup crypto
+ * Create a new private key by reading our peer's key from
+ * the file specified in the configuration.
+ *
+ * @param cfg the configuration to use
+ * @return new private key, NULL on error (for example,
+ * permission denied); free using #GNUNET_free
+ */
+struct GNUNET_CRYPTO_EddsaPrivateKey *
+GNUNET_CRYPTO_eddsa_key_create_from_configuration (const struct GNUNET_CONFIGURATION_Handle *cfg);
+
+
+/**
+ * @ingroup crypto
+ * Create a new private key. Caller must free return value.
+ *
+ * @return fresh private key; free using #GNUNET_free
+ */
+struct GNUNET_CRYPTO_EcdsaPrivateKey *
+GNUNET_CRYPTO_ecdsa_key_create (void);
+
+
+/**
+ * @ingroup crypto
+ * Create a new private key. Caller must free return value.
+ *
+ * @return fresh private key; free using #GNUNET_free
+ */
+struct GNUNET_CRYPTO_EddsaPrivateKey *
+GNUNET_CRYPTO_eddsa_key_create (void);
+
+
+/**
+ * @ingroup crypto
+ * Create a new private key. Clear with #GNUNET_CRYPTO_ecdhe_key_clear().
+ *
+ * @param[out] pk set to fresh private key;
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
+ */
+int
+GNUNET_CRYPTO_ecdhe_key_create2 (struct GNUNET_CRYPTO_EcdhePrivateKey *pk);
+
+
+/**
+ * @ingroup crypto
+ * Create a new private key. Caller must free return value.
+ *
+ * @return fresh private key; free using #GNUNET_free
+ */
+struct GNUNET_CRYPTO_EcdhePrivateKey *
+GNUNET_CRYPTO_ecdhe_key_create (void);
+
+
+/**
+ * @ingroup crypto
+ * Clear memory that was used to store a private key.
+ *
+ * @param pk location of the key
+ */
+void
+GNUNET_CRYPTO_eddsa_key_clear (struct GNUNET_CRYPTO_EddsaPrivateKey *pk);
+
+
+/**
+ * @ingroup crypto
+ * Clear memory that was used to store a private key.
+ *
+ * @param pk location of the key
+ */
+void
+GNUNET_CRYPTO_ecdsa_key_clear (struct GNUNET_CRYPTO_EcdsaPrivateKey *pk);
+
+
+/**
+ * @ingroup crypto
+ * Clear memory that was used to store a private key.
+ *
+ * @param pk location of the key
+ */
+void
+GNUNET_CRYPTO_ecdhe_key_clear (struct GNUNET_CRYPTO_EcdhePrivateKey *pk);
+
+
+/**
+ * @ingroup crypto
+ * Get the shared private key we use for anonymous users.
+ *
+ * @return "anonymous" private key; do not free
+ */
+const struct GNUNET_CRYPTO_EcdsaPrivateKey *
+GNUNET_CRYPTO_ecdsa_key_get_anonymous (void);
+
+
+/**
+ * @ingroup crypto
+ * Setup a hostkey file for a peer given the name of the
+ * configuration file (!). This function is used so that
+ * at a later point code can be certain that reading a
+ * hostkey is fast (for example in time-dependent testcases).
+*
+ * @param cfg_name name of the configuration file to use
+ */
+void
+GNUNET_CRYPTO_eddsa_setup_hostkey (const char *cfg_name);
+
+
+/**
+ * @ingroup crypto
+ * Retrieve the identity of the host's peer.
+ *
+ * @param cfg configuration to use
+ * @param dst pointer to where to write the peer identity
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR if the identity
+ * could not be retrieved
+ */
+int
+GNUNET_CRYPTO_get_peer_identity (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ struct GNUNET_PeerIdentity *dst);
+
+
+/**
+ * Compare two Peer Identities.
+ *
+ * @param first first peer identity
+ * @param second second peer identity
+ * @return bigger than 0 if first > second,
+ * 0 if they are the same
+ * smaller than 0 if second > first
+ */
+int
+GNUNET_CRYPTO_cmp_peer_identity (const struct GNUNET_PeerIdentity *first,
+ const struct GNUNET_PeerIdentity *second);
+
+
+/**
+ * Internal structure used to cache pre-calculated values for DLOG calculation.
+ */
+struct GNUNET_CRYPTO_EccDlogContext;
+
+
+/**
+ * Point on a curve (always for Curve25519) encoded in a format suitable
+ * for network transmission (ECDH), see http://cr.yp.to/ecdh.html.
+ */
+struct GNUNET_CRYPTO_EccPoint
+{
+ /**
+ * Q consists of an x- and a y-value, each mod p (256 bits), given
+ * here in affine coordinates and Ed25519 standard compact format.
+ */
+ unsigned char q_y[256 / 8];
+};
+
+
+/**
+ * Do pre-calculation for ECC discrete logarithm for small factors.
+ *
+ * @param max maximum value the factor can be
+ * @param mem memory to use (should be smaller than @a max), must not be zero.
+ * @return NULL on error
+ */
+struct GNUNET_CRYPTO_EccDlogContext *
+GNUNET_CRYPTO_ecc_dlog_prepare (unsigned int max,
+ unsigned int mem);
+
+
+/**
+ * Calculate ECC discrete logarithm for small factors.
+ * Opposite of #GNUNET_CRYPTO_ecc_dexp().
+ *
+ * @param dlc precalculated values, determine range of factors
+ * @param input point on the curve to factor
+ * @return INT_MAX if dlog failed, otherwise the factor
+ */
+int
+GNUNET_CRYPTO_ecc_dlog (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_point_t input);
+
+
+/**
+ * Multiply the generator g of the elliptic curve by @a val
+ * to obtain the point on the curve representing @a val.
+ * Afterwards, point addition will correspond to integer
+ * addition. #GNUNET_CRYPTO_ecc_dlog() can be used to
+ * convert a point back to an integer (as long as the
+ * integer is smaller than the MAX of the @a edc context).
+ *
+ * @param edc calculation context for ECC operations
+ * @param val value to encode into a point
+ * @return representation of the value as an ECC point,
+ * must be freed using #GNUNET_CRYPTO_ecc_free()
+ */
+gcry_mpi_point_t
+GNUNET_CRYPTO_ecc_dexp (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ int val);
+
+
+/**
+ * Multiply the generator g of the elliptic curve by @a val
+ * to obtain the point on the curve representing @a val.
+ *
+ * @param edc calculation context for ECC operations
+ * @param val (positive) value to encode into a point
+ * @return representation of the value as an ECC point,
+ * must be freed using #GNUNET_CRYPTO_ecc_free()
+ */
+gcry_mpi_point_t
+GNUNET_CRYPTO_ecc_dexp_mpi (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_t val);
+
+
+/**
+ * Multiply the point @a p on the elliptic curve by @a val.
+ *
+ * @param edc calculation context for ECC operations
+ * @param p point to multiply
+ * @param val (positive) value to encode into a point
+ * @return representation of the value as an ECC point,
+ * must be freed using #GNUNET_CRYPTO_ecc_free()
+ */
+gcry_mpi_point_t
+GNUNET_CRYPTO_ecc_pmul_mpi (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_point_t p,
+ gcry_mpi_t val);
+
+
+/**
+ * Convert point value to binary representation.
+ *
+ * @param edc calculation context for ECC operations
+ * @param point computational point representation
+ * @param[out] bin binary point representation
+ */
+void
+GNUNET_CRYPTO_ecc_point_to_bin (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_point_t point,
+ struct GNUNET_CRYPTO_EccPoint *bin);
+
+
+/**
+ * Convert binary representation of a point to computational representation.
+ *
+ * @param edc calculation context for ECC operations
+ * @param bin binary point representation
+ * @return computational representation
+ */
+gcry_mpi_point_t
+GNUNET_CRYPTO_ecc_bin_to_point (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ const struct GNUNET_CRYPTO_EccPoint *bin);
+
+
+/**
+ * Add two points on the elliptic curve.
+ *
+ * @param edc calculation context for ECC operations
+ * @param a some value
+ * @param b some value
+ * @return @a a + @a b, must be freed using #GNUNET_CRYPTO_ecc_free()
+ */
+gcry_mpi_point_t
+GNUNET_CRYPTO_ecc_add (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_point_t a,
+ gcry_mpi_point_t b);
+
+
+/**
+ * Obtain a random point on the curve and its
+ * additive inverse. Both returned values
+ * must be freed using #GNUNET_CRYPTO_ecc_free().
+ *
+ * @param edc calculation context for ECC operations
+ * @param[out] r set to a random point on the curve
+ * @param[out] r_inv set to the additive inverse of @a r
+ */
+void
+GNUNET_CRYPTO_ecc_rnd (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_point_t *r,
+ gcry_mpi_point_t *r_inv);
+
+
+/**
+ * Obtain a random scalar for point multiplication on the curve and
+ * its multiplicative inverse.
+ *
+ * @param edc calculation context for ECC operations
+ * @param[out] r set to a random scalar on the curve
+ * @param[out] r_inv set to the multiplicative inverse of @a r
+ */
+void
+GNUNET_CRYPTO_ecc_rnd_mpi (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_t *r,
+ gcry_mpi_t *r_inv);
+
+
+/**
+ * Generate a random value mod n.
+ *
+ * @param edc ECC context
+ * @return random value mod n.
+ */
+gcry_mpi_t
+GNUNET_CRYPTO_ecc_random_mod_n (struct GNUNET_CRYPTO_EccDlogContext *edc);
+
+
+/**
+ * Free a point value returned by the API.
+ *
+ * @param p point to free
+ */
+void
+GNUNET_CRYPTO_ecc_free (gcry_mpi_point_t p);
+
+
+/**
+ * Release precalculated values.
+ *
+ * @param dlc dlog context
+ */
+void
+GNUNET_CRYPTO_ecc_dlog_release (struct GNUNET_CRYPTO_EccDlogContext *dlc);
+
+
+/**
+ * @ingroup crypto
+ * Derive key material from a public and a private ECC key.
+ *
+ * @param priv private key to use for the ECDH (x)
+ * @param pub public key to use for the ECDH (yG)
+ * @param key_material where to write the key material (xyG)
+ * @return #GNUNET_SYSERR on error, #GNUNET_OK on success
+ */
+int
+GNUNET_CRYPTO_ecc_ecdh (const struct GNUNET_CRYPTO_EcdhePrivateKey *priv,
+ const struct GNUNET_CRYPTO_EcdhePublicKey *pub,
+ struct GNUNET_HashCode *key_material);
+
+
+/**
+ * @ingroup crypto
+ * Derive key material from a ECDH public key and a private EdDSA key.
+ * Dual to #GNUNET_CRRYPTO_ecdh_eddsa.
+ *
+ * @param priv private key from EdDSA to use for the ECDH (x)
+ * @param pub public key to use for the ECDH (yG)
+ * @param key_material where to write the key material H(h(x)yG)
+ * @return #GNUNET_SYSERR on error, #GNUNET_OK on success
+ */
+int
+GNUNET_CRYPTO_eddsa_ecdh (const struct GNUNET_CRYPTO_EddsaPrivateKey *priv,
+ const struct GNUNET_CRYPTO_EcdhePublicKey *pub,
+ struct GNUNET_HashCode *key_material);
+
+/**
+ * @ingroup crypto
+ * Derive key material from a ECDH public key and a private ECDSA key.
+ * Dual to #GNUNET_CRRYPTO_ecdh_ecdsa.
+ *
+ * @param priv private key from ECDSA to use for the ECDH (x)
+ * @param pub public key to use for the ECDH (yG)
+ * @param key_material where to write the key material H(h(x)yG)
+ * @return #GNUNET_SYSERR on error, #GNUNET_OK on success
+ */
+int
+GNUNET_CRYPTO_ecdsa_ecdh (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv,
+ const struct GNUNET_CRYPTO_EcdhePublicKey *pub,
+ struct GNUNET_HashCode *key_material);
+
+
+/**
+ * @ingroup crypto
+ * Derive key material from a EdDSA public key and a private ECDH key.
+ * Dual to #GNUNET_CRRYPTO_eddsa_ecdh.
+ *
+ * @param priv private key to use for the ECDH (y)
+ * @param pub public key from EdDSA to use for the ECDH (X=h(x)G)
+ * @param key_material where to write the key material H(yX)=H(h(x)yG)
+ * @return #GNUNET_SYSERR on error, #GNUNET_OK on success
+ */
+int
+GNUNET_CRYPTO_ecdh_eddsa (const struct GNUNET_CRYPTO_EcdhePrivateKey *priv,
+ const struct GNUNET_CRYPTO_EddsaPublicKey *pub,
+ struct GNUNET_HashCode *key_material);
+
+/**
+ * @ingroup crypto
+ * Derive key material from a EcDSA public key and a private ECDH key.
+ * Dual to #GNUNET_CRRYPTO_ecdsa_ecdh.
+ *
+ * @param priv private key to use for the ECDH (y)
+ * @param pub public key from ECDSA to use for the ECDH (X=h(x)G)
+ * @param key_material where to write the key material H(yX)=H(h(x)yG)
+ * @return #GNUNET_SYSERR on error, #GNUNET_OK on success
+ */
+int
+GNUNET_CRYPTO_ecdh_ecdsa (const struct GNUNET_CRYPTO_EcdhePrivateKey *priv,
+ const struct GNUNET_CRYPTO_EcdsaPublicKey *pub,
+ struct GNUNET_HashCode *key_material);
+
+
+/**
+ * @ingroup crypto
+ * EdDSA sign a given block.
+ *
+ * @param priv private key to use for the signing
* @param purpose what to sign (size, purpose)
* @param sig where to write the signature
- * @return GNUNET_SYSERR on error, GNUNET_OK on success
+ * @return #GNUNET_SYSERR on error, #GNUNET_OK on success
*/
-int GNUNET_CRYPTO_rsa_sign (const struct GNUNET_CRYPTO_RsaPrivateKey *key,
- const struct GNUNET_CRYPTO_RsaSignaturePurpose
- *purpose,
- struct GNUNET_CRYPTO_RsaSignature *sig);
+int
+GNUNET_CRYPTO_eddsa_sign (const struct GNUNET_CRYPTO_EddsaPrivateKey *priv,
+ const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose,
+ struct GNUNET_CRYPTO_EddsaSignature *sig);
/**
- * Verify signature. Note that the caller MUST have already
- * checked that "validate->size" bytes are actually available.
+ * @ingroup crypto
+ * ECDSA Sign a given block.
*
- * @param purpose what is the purpose that validate should have?
+ * @param priv private key to use for the signing
+ * @param purpose what to sign (size, purpose)
+ * @param sig where to write the signature
+ * @return #GNUNET_SYSERR on error, #GNUNET_OK on success
+ */
+int
+GNUNET_CRYPTO_ecdsa_sign (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv,
+ const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose,
+ struct GNUNET_CRYPTO_EcdsaSignature *sig);
+
+/**
+ * @ingroup crypto
+ * Verify EdDSA signature.
+ *
+ * @param purpose what is the purpose that the signature should have?
* @param validate block to validate (size, purpose, data)
* @param sig signature that is being validated
- * @param publicKey public key of the signer
- * @return GNUNET_OK if ok, GNUNET_SYSERR if invalid
+ * @param pub public key of the signer
+ * @returns #GNUNET_OK if ok, #GNUNET_SYSERR if invalid
+ */
+int
+GNUNET_CRYPTO_eddsa_verify (uint32_t purpose,
+ const struct GNUNET_CRYPTO_EccSignaturePurpose *validate,
+ const struct GNUNET_CRYPTO_EddsaSignature *sig,
+ const struct GNUNET_CRYPTO_EddsaPublicKey *pub);
+
+
+
+/**
+ * @ingroup crypto
+ * Verify ECDSA signature.
+ *
+ * @param purpose what is the purpose that the signature should have?
+ * @param validate block to validate (size, purpose, data)
+ * @param sig signature that is being validated
+ * @param pub public key of the signer
+ * @returns #GNUNET_OK if ok, #GNUNET_SYSERR if invalid
+ */
+int
+GNUNET_CRYPTO_ecdsa_verify (uint32_t purpose,
+ const struct GNUNET_CRYPTO_EccSignaturePurpose *validate,
+ const struct GNUNET_CRYPTO_EcdsaSignature *sig,
+ const struct GNUNET_CRYPTO_EcdsaPublicKey *pub);
+
+
+/**
+ * @ingroup crypto
+ * Derive a private key from a given private key and a label.
+ * Essentially calculates a private key 'h = H(l,P) * d mod n'
+ * where n is the size of the ECC group and P is the public
+ * key associated with the private key 'd'.
+ *
+ * @param priv original private key
+ * @param label label to use for key deriviation
+ * @param context additional context to use for HKDF of 'h';
+ * typically the name of the subsystem/application
+ * @return derived private key
+ */
+struct GNUNET_CRYPTO_EcdsaPrivateKey *
+GNUNET_CRYPTO_ecdsa_private_key_derive (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv,
+ const char *label,
+ const char *context);
+
+
+/**
+ * @ingroup crypto
+ * Derive a public key from a given public key and a label.
+ * Essentially calculates a public key 'V = H(l,P) * P'.
+ *
+ * @param pub original public key
+ * @param label label to use for key deriviation
+ * @param context additional context to use for HKDF of 'h'.
+ * typically the name of the subsystem/application
+ * @param result where to write the derived public key
*/
-int GNUNET_CRYPTO_rsa_verify (uint32_t purpose,
- const struct GNUNET_CRYPTO_RsaSignaturePurpose
- *validate,
- const struct GNUNET_CRYPTO_RsaSignature *sig,
- const struct
- GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
- *publicKey);
+void
+GNUNET_CRYPTO_ecdsa_public_key_derive (const struct GNUNET_CRYPTO_EcdsaPublicKey *pub,
+ const char *label,
+ const char *context,
+ struct GNUNET_CRYPTO_EcdsaPublicKey *result);
+/**
+ * Output the given MPI value to the given buffer in network
+ * byte order. The MPI @a val may not be negative.
+ *
+ * @param buf where to output to
+ * @param size number of bytes in @a buf
+ * @param val value to write to @a buf
+ */
+void
+GNUNET_CRYPTO_mpi_print_unsigned (void *buf,
+ size_t size,
+ gcry_mpi_t val);
+
/**
- * This function should only be called in testcases
- * where strong entropy gathering is not desired
- * (for example, for hostkey generation).
+ * Convert data buffer into MPI value.
+ * The buffer is interpreted as network
+ * byte order, unsigned integer.
+ *
+ * @param result where to store MPI value (allocated)
+ * @param data raw data (GCRYMPI_FMT_USG)
+ * @param size number of bytes in @a data
*/
-void GNUNET_CRYPTO_random_disable_entropy_gathering (void);
+void
+GNUNET_CRYPTO_mpi_scan_unsigned (gcry_mpi_t *result,
+ const void *data,
+ size_t size);
+
+
+/**
+ * Create a freshly generated paillier public key.
+ *
+ * @param[out] public_key Where to store the public key?
+ * @param[out] private_key Where to store the private key?
+ */
+void
+GNUNET_CRYPTO_paillier_create (struct GNUNET_CRYPTO_PaillierPublicKey *public_key,
+ struct GNUNET_CRYPTO_PaillierPrivateKey *private_key);
+
+
+/**
+ * Encrypt a plaintext with a paillier public key.
+ *
+ * @param public_key Public key to use.
+ * @param m Plaintext to encrypt.
+ * @param desired_ops How many homomorphic ops the caller intends to use
+ * @param[out] ciphertext Encrytion of @a plaintext with @a public_key.
+ * @return guaranteed number of supported homomorphic operations >= 1,
+ * or desired_ops, in case that is lower,
+ * or -1 if less than one homomorphic operation is possible
+ */
+int
+GNUNET_CRYPTO_paillier_encrypt (const struct GNUNET_CRYPTO_PaillierPublicKey *public_key,
+ const gcry_mpi_t m,
+ int desired_ops,
+ struct GNUNET_CRYPTO_PaillierCiphertext *ciphertext);
+
+
+/**
+ * Decrypt a paillier ciphertext with a private key.
+ *
+ * @param private_key Private key to use for decryption.
+ * @param public_key Public key to use for decryption.
+ * @param ciphertext Ciphertext to decrypt.
+ * @param[out] m Decryption of @a ciphertext with @private_key.
+ */
+void
+GNUNET_CRYPTO_paillier_decrypt (const struct GNUNET_CRYPTO_PaillierPrivateKey *private_key,
+ const struct GNUNET_CRYPTO_PaillierPublicKey *public_key,
+ const struct GNUNET_CRYPTO_PaillierCiphertext *ciphertext,
+ gcry_mpi_t m);
+
+
+/**
+ * Compute a ciphertext that represents the sum of the plaintext in @a x1 and @a x2
+ *
+ * Note that this operation can only be done a finite number of times
+ * before an overflow occurs.
+ *
+ * @param public_key Public key to use for encryption.
+ * @param c1 Paillier cipher text.
+ * @param c2 Paillier cipher text.
+ * @param[out] result Result of the homomorphic operation.
+ * @return #GNUNET_OK if the result could be computed,
+ * #GNUNET_SYSERR if no more homomorphic operations are remaining.
+ */
+int
+GNUNET_CRYPTO_paillier_hom_add (const struct GNUNET_CRYPTO_PaillierPublicKey *public_key,
+ const struct GNUNET_CRYPTO_PaillierCiphertext *c1,
+ const struct GNUNET_CRYPTO_PaillierCiphertext *c2,
+ struct GNUNET_CRYPTO_PaillierCiphertext *result);
+
+
+/**
+ * Get the number of remaining supported homomorphic operations.
+ *
+ * @param c Paillier cipher text.
+ * @return the number of remaining homomorphic operations
+ */
+int
+GNUNET_CRYPTO_paillier_hom_get_remaining (const struct GNUNET_CRYPTO_PaillierCiphertext *c);
+
+
+/* ********* Chaum-style RSA-based blind signatures ******************* */
+
+
+
+
+/**
+ * The private information of an RSA key pair.
+ */
+struct GNUNET_CRYPTO_RsaPrivateKey;
+
+/**
+ * The public information of an RSA key pair.
+ */
+struct GNUNET_CRYPTO_RsaPublicKey;
+
+/**
+ * Constant-size pre-secret for blinding key generation.
+ */
+struct GNUNET_CRYPTO_RsaBlindingKeySecret
+{
+ /**
+ * Bits used to generate the blinding key. 256 bits
+ * of entropy is enough.
+ */
+ uint32_t pre_secret[8] GNUNET_PACKED;
+};
+
+/**
+ * @brief an RSA signature
+ */
+struct GNUNET_CRYPTO_RsaSignature;
+
+
+/**
+ * Create a new private key. Caller must free return value.
+ *
+ * @param len length of the key in bits (i.e. 2048)
+ * @return fresh private key
+ */
+struct GNUNET_CRYPTO_RsaPrivateKey *
+GNUNET_CRYPTO_rsa_private_key_create (unsigned int len);
+
+
+/**
+ * Free memory occupied by the private key.
+ *
+ * @param key pointer to the memory to free
+ */
+void
+GNUNET_CRYPTO_rsa_private_key_free (struct GNUNET_CRYPTO_RsaPrivateKey *key);
+
+
+/**
+ * Encode the private key in a format suitable for
+ * storing it into a file.
+ *
+ * @param key the private key
+ * @param[out] buffer set to a buffer with the encoded key
+ * @return size of memory allocatedin @a buffer
+ */
+size_t
+GNUNET_CRYPTO_rsa_private_key_encode (const struct GNUNET_CRYPTO_RsaPrivateKey *key,
+ char **buffer);
+
+
+/**
+ * Decode the private key from the data-format back
+ * to the "normal", internal format.
+ *
+ * @param buf the buffer where the private key data is stored
+ * @param len the length of the data in @a buf
+ * @return NULL on error
+ */
+struct GNUNET_CRYPTO_RsaPrivateKey *
+GNUNET_CRYPTO_rsa_private_key_decode (const char *buf,
+ size_t len);
+
+
+/**
+ * Duplicate the given private key
+ *
+ * @param key the private key to duplicate
+ * @return the duplicate key; NULL upon error
+ */
+struct GNUNET_CRYPTO_RsaPrivateKey *
+GNUNET_CRYPTO_rsa_private_key_dup (const struct GNUNET_CRYPTO_RsaPrivateKey *key);
+
+
+/**
+ * Extract the public key of the given private key.
+ *
+ * @param priv the private key
+ * @retur NULL on error, otherwise the public key
+ */
+struct GNUNET_CRYPTO_RsaPublicKey *
+GNUNET_CRYPTO_rsa_private_key_get_public (const struct GNUNET_CRYPTO_RsaPrivateKey *priv);
+
+
+/**
+ * Compute hash over the public key.
+ *
+ * @param key public key to hash
+ * @param hc where to store the hash code
+ */
+void
+GNUNET_CRYPTO_rsa_public_key_hash (const struct GNUNET_CRYPTO_RsaPublicKey *key,
+ struct GNUNET_HashCode *hc);
+
+
+/**
+ * Obtain the length of the RSA key in bits.
+ *
+ * @param key the public key to introspect
+ * @return length of the key in bits
+ */
+unsigned int
+GNUNET_CRYPTO_rsa_public_key_len (const struct GNUNET_CRYPTO_RsaPublicKey *key);
+
+
+/**
+ * Free memory occupied by the public key.
+ *
+ * @param key pointer to the memory to free
+ */
+void
+GNUNET_CRYPTO_rsa_public_key_free (struct GNUNET_CRYPTO_RsaPublicKey *key);
+
+
+/**
+ * Encode the public key in a format suitable for
+ * storing it into a file.
+ *
+ * @param key the private key
+ * @param[out] buffer set to a buffer with the encoded key
+ * @return size of memory allocated in @a buffer
+ */
+size_t
+GNUNET_CRYPTO_rsa_public_key_encode (const struct GNUNET_CRYPTO_RsaPublicKey *key,
+ char **buffer);
+
+
+/**
+ * Decode the public key from the data-format back
+ * to the "normal", internal format.
+ *
+ * @param buf the buffer where the public key data is stored
+ * @param len the length of the data in @a buf
+ * @return NULL on error
+ */
+struct GNUNET_CRYPTO_RsaPublicKey *
+GNUNET_CRYPTO_rsa_public_key_decode (const char *buf,
+ size_t len);
+
+
+/**
+ * Duplicate the given public key
+ *
+ * @param key the public key to duplicate
+ * @return the duplicate key; NULL upon error
+ */
+struct GNUNET_CRYPTO_RsaPublicKey *
+GNUNET_CRYPTO_rsa_public_key_dup (const struct GNUNET_CRYPTO_RsaPublicKey *key);
+
+
+/**
+ * Compare the values of two signatures.
+ *
+ * @param s1 one signature
+ * @param s2 the other signature
+ * @return 0 if the two are equal
+ */
+int
+GNUNET_CRYPTO_rsa_signature_cmp (struct GNUNET_CRYPTO_RsaSignature *s1,
+ struct GNUNET_CRYPTO_RsaSignature *s2);
+
+/**
+ * Compare the values of two private keys.
+ *
+ * @param p1 one private key
+ * @param p2 the other private key
+ * @return 0 if the two are equal
+ */
+int
+GNUNET_CRYPTO_rsa_private_key_cmp (struct GNUNET_CRYPTO_RsaPrivateKey *p1,
+ struct GNUNET_CRYPTO_RsaPrivateKey *p2);
+
+
+/**
+ * Compare the values of two public keys.
+ *
+ * @param p1 one public key
+ * @param p2 the other public key
+ * @return 0 if the two are equal
+ */
+int
+GNUNET_CRYPTO_rsa_public_key_cmp (struct GNUNET_CRYPTO_RsaPublicKey *p1,
+ struct GNUNET_CRYPTO_RsaPublicKey *p2);
+
+
+/**
+ * Blinds the given message with the given blinding key
+ *
+ * @param hash hash of the message to sign
+ * @param bkey the blinding key
+ * @param pkey the public key of the signer
+ * @param[out] buf set to a buffer with the blinded message to be signed
+ * @param[out] buf_size number of bytes stored in @a buf
+ * @return #GNUNET_YES if successful, #GNUNET_NO if RSA key is malicious
+ */
+int
+GNUNET_CRYPTO_rsa_blind (const struct GNUNET_HashCode *hash,
+ const struct GNUNET_CRYPTO_RsaBlindingKeySecret *bks,
+ struct GNUNET_CRYPTO_RsaPublicKey *pkey,
+ char **buf,
+ size_t *buf_size);
+
+
+/**
+ * Sign a blinded value, which must be a full domain hash of a message.
+ *
+ * @param key private key to use for the signing
+ * @param msg the (blinded) message to sign
+ * @param msg_len number of bytes in @a msg to sign
+ * @return NULL on error, signature on success
+ */
+struct GNUNET_CRYPTO_RsaSignature *
+GNUNET_CRYPTO_rsa_sign_blinded (const struct GNUNET_CRYPTO_RsaPrivateKey *key,
+ const void *msg,
+ size_t msg_len);
+
+
+/**
+ * Create and sign a full domain hash of a message.
+ *
+ * @param key private key to use for the signing
+ * @param hash the hash of the message to sign
+ * @return NULL on error, including a malicious RSA key, signature on success
+ */
+struct GNUNET_CRYPTO_RsaSignature *
+GNUNET_CRYPTO_rsa_sign_fdh (const struct GNUNET_CRYPTO_RsaPrivateKey *key,
+ const struct GNUNET_HashCode *hash);
+
+
+/**
+ * Free memory occupied by signature.
+ *
+ * @param sig memory to free
+ */
+void
+GNUNET_CRYPTO_rsa_signature_free (struct GNUNET_CRYPTO_RsaSignature *sig);
+
+
+/**
+ * Encode the given signature in a format suitable for storing it into a file.
+ *
+ * @param sig the signature
+ * @param[out] buffer set to a buffer with the encoded key
+ * @return size of memory allocated in @a buffer
+ */
+size_t
+GNUNET_CRYPTO_rsa_signature_encode (const struct GNUNET_CRYPTO_RsaSignature *sig,
+ char **buffer);
+
+
+/**
+ * Decode the signature from the data-format back to the "normal", internal
+ * format.
+ *
+ * @param buf the buffer where the public key data is stored
+ * @param len the length of the data in @a buf
+ * @return NULL on error
+ */
+struct GNUNET_CRYPTO_RsaSignature *
+GNUNET_CRYPTO_rsa_signature_decode (const char *buf,
+ size_t len);
+
+
+/**
+ * Duplicate the given rsa signature
+ *
+ * @param sig the signature to duplicate
+ * @return the duplicate key; NULL upon error
+ */
+struct GNUNET_CRYPTO_RsaSignature *
+GNUNET_CRYPTO_rsa_signature_dup (const struct GNUNET_CRYPTO_RsaSignature *sig);
+
+
+/**
+ * Unblind a blind-signed signature. The signature should have been generated
+ * with #GNUNET_CRYPTO_rsa_sign() using a hash that was blinded with
+ * #GNUNET_CRYPTO_rsa_blind().
+ *
+ * @param sig the signature made on the blinded signature purpose
+ * @param bks the blinding key secret used to blind the signature purpose
+ * @param pkey the public key of the signer
+ * @return unblinded signature on success, NULL if RSA key is bad or malicious.
+ */
+struct GNUNET_CRYPTO_RsaSignature *
+GNUNET_CRYPTO_rsa_unblind (const struct GNUNET_CRYPTO_RsaSignature *sig,
+ const struct GNUNET_CRYPTO_RsaBlindingKeySecret *bks,
+ struct GNUNET_CRYPTO_RsaPublicKey *pkey);
+
+
+/**
+ * Verify whether the given hash corresponds to the given signature and the
+ * signature is valid with respect to the given public key.
+ *
+ * @param hash the message to verify to match the @a sig
+ * @param sig signature that is being validated
+ * @param public_key public key of the signer
+ * @returns #GNUNET_YES if ok, #GNUNET_NO if RSA key is malicious, #GNUNET_SYSERR if signature
+ */
+int
+GNUNET_CRYPTO_rsa_verify (const struct GNUNET_HashCode *hash,
+ const struct GNUNET_CRYPTO_RsaSignature *sig,
+ const struct GNUNET_CRYPTO_RsaPublicKey *public_key);
+
#if 0 /* keep Emacsens' auto-indent happy */
{
projects / oweals / gnunet.git / blobdiff