/*
This file is part of GNUnet.
- Copyright (C) 2001-2013 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
* @author Gerd Knorr <kraxel@bytesex.org>
* @author Ioana Patrascu
* @author Tzvetan Horozov
+ * @author Jeffrey Burdges <burdges@gnunet.org>
*
- * @defgroup crypto Cryptographic operations
- * @defgroup hash Hashing and operations on hashes
+ * @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
/**
- * @brief A 512-bit hashcode
+ * @brief A 512-bit hashcode. These are the default length for GNUnet, using SHA-512.
*/
-struct GNUNET_HashCode;
+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).
#include <gcrypt.h>
-/**
- * @brief A 512-bit hashcode
- */
-struct GNUNET_HashCode
-{
- uint32_t bits[512 / 8 / sizeof (uint32_t)]; /* = 16 */
-};
-
-
/**
* Maximum length of an ECC signature.
* Note: round up to multiple of 8 minus 2 for alignment.
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.
*
size_t len);
+
+
/**
* @ingroup hash
* Compute the CRC32 checksum for the first 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
GNUNET_CRYPTO_ecdsa_public_key_to_string (const struct GNUNET_CRYPTO_EcdsaPublicKey *pub);
+/**
+ * Convert a private key to a string.
+ *
+ * @param priv key to convert
+ * @return string representing @a pub
+ */
+char *
+GNUNET_CRYPTO_eddsa_private_key_to_string (const struct GNUNET_CRYPTO_EddsaPrivateKey *priv);
+
+
/**
* Convert a public key to a string.
*
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.
*
* @param max maximum value the factor can be
* @param mem memory to use (should be smaller than @a max), must not be zero.
- * @return @a max if dlog failed, otherwise the factor
+ * @return NULL on error
*/
struct GNUNET_CRYPTO_EccDlogContext *
GNUNET_CRYPTO_ecc_dlog_prepare (unsigned int max,
*
* @param dlc precalculated values, determine range of factors
* @param input point on the curve to factor
- * @return `dlc->max` if dlog failed, otherwise the factor
+ * @return INT_MAX if dlog failed, otherwise the factor
*/
int
GNUNET_CRYPTO_ecc_dlog (struct GNUNET_CRYPTO_EccDlogContext *edc,
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
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
/**
* The private information of an RSA key pair.
*/
-struct GNUNET_CRYPTO_rsa_PrivateKey;
+struct GNUNET_CRYPTO_RsaPrivateKey;
/**
* The public information of an RSA key pair.
*/
-struct GNUNET_CRYPTO_rsa_PublicKey;
+struct GNUNET_CRYPTO_RsaPublicKey;
/**
- * Key used to blind a message
+ * Constant-size pre-secret for blinding key generation.
*/
-struct GNUNET_CRYPTO_rsa_BlindingKey;
+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_rsa_Signature;
+struct GNUNET_CRYPTO_RsaSignature;
/**
* @param len length of the key in bits (i.e. 2048)
* @return fresh private key
*/
-struct GNUNET_CRYPTO_rsa_PrivateKey *
+struct GNUNET_CRYPTO_RsaPrivateKey *
GNUNET_CRYPTO_rsa_private_key_create (unsigned int len);
* @param key pointer to the memory to free
*/
void
-GNUNET_CRYPTO_rsa_private_key_free (struct GNUNET_CRYPTO_rsa_PrivateKey *key);
+GNUNET_CRYPTO_rsa_private_key_free (struct GNUNET_CRYPTO_RsaPrivateKey *key);
/**
* @return size of memory allocatedin @a buffer
*/
size_t
-GNUNET_CRYPTO_rsa_private_key_encode (const struct GNUNET_CRYPTO_rsa_PrivateKey *key,
+GNUNET_CRYPTO_rsa_private_key_encode (const struct GNUNET_CRYPTO_RsaPrivateKey *key,
char **buffer);
* @param len the length of the data in @a buf
* @return NULL on error
*/
-struct GNUNET_CRYPTO_rsa_PrivateKey *
+struct GNUNET_CRYPTO_RsaPrivateKey *
GNUNET_CRYPTO_rsa_private_key_decode (const char *buf,
size_t len);
* @param key the private key to duplicate
* @return the duplicate key; NULL upon error
*/
-struct GNUNET_CRYPTO_rsa_PrivateKey *
-GNUNET_CRYPTO_rsa_private_key_dup (const struct GNUNET_CRYPTO_rsa_PrivateKey *key);
+struct GNUNET_CRYPTO_RsaPrivateKey *
+GNUNET_CRYPTO_rsa_private_key_dup (const struct GNUNET_CRYPTO_RsaPrivateKey *key);
/**
* @param priv the private key
* @retur NULL on error, otherwise the public key
*/
-struct GNUNET_CRYPTO_rsa_PublicKey *
-GNUNET_CRYPTO_rsa_private_key_get_public (const struct GNUNET_CRYPTO_rsa_PrivateKey *priv);
+struct GNUNET_CRYPTO_RsaPublicKey *
+GNUNET_CRYPTO_rsa_private_key_get_public (const struct GNUNET_CRYPTO_RsaPrivateKey *priv);
/**
* @param hc where to store the hash code
*/
void
-GNUNET_CRYPTO_rsa_public_key_hash (const struct GNUNET_CRYPTO_rsa_PublicKey *key,
+GNUNET_CRYPTO_rsa_public_key_hash (const struct GNUNET_CRYPTO_RsaPublicKey *key,
struct GNUNET_HashCode *hc);
* @return length of the key in bits
*/
unsigned int
-GNUNET_CRYPTO_rsa_public_key_len (const struct GNUNET_CRYPTO_rsa_PublicKey *key);
+GNUNET_CRYPTO_rsa_public_key_len (const struct GNUNET_CRYPTO_RsaPublicKey *key);
/**
* @param key pointer to the memory to free
*/
void
-GNUNET_CRYPTO_rsa_public_key_free (struct GNUNET_CRYPTO_rsa_PublicKey *key);
+GNUNET_CRYPTO_rsa_public_key_free (struct GNUNET_CRYPTO_RsaPublicKey *key);
/**
* @return size of memory allocated in @a buffer
*/
size_t
-GNUNET_CRYPTO_rsa_public_key_encode (const struct GNUNET_CRYPTO_rsa_PublicKey *key,
+GNUNET_CRYPTO_rsa_public_key_encode (const struct GNUNET_CRYPTO_RsaPublicKey *key,
char **buffer);
* @param len the length of the data in @a buf
* @return NULL on error
*/
-struct GNUNET_CRYPTO_rsa_PublicKey *
+struct GNUNET_CRYPTO_RsaPublicKey *
GNUNET_CRYPTO_rsa_public_key_decode (const char *buf,
size_t len);
* @param key the public key to duplicate
* @return the duplicate key; NULL upon error
*/
-struct GNUNET_CRYPTO_rsa_PublicKey *
-GNUNET_CRYPTO_rsa_public_key_dup (const struct GNUNET_CRYPTO_rsa_PublicKey *key);
-
-
-/**
- * Create a blinding key
- *
- * @param len length of the key in bits (i.e. 2048)
- * @return the newly created blinding key
- */
-struct GNUNET_CRYPTO_rsa_BlindingKey *
-GNUNET_CRYPTO_rsa_blinding_key_create (unsigned int len);
-
-
-/**
- * Compare the values of two blinding keys.
- *
- * @param b1 one key
- * @param b2 the other key
- * @return 0 if the two are equal
- */
-int
-GNUNET_CRYPTO_rsa_blinding_key_cmp (struct GNUNET_CRYPTO_rsa_BlindingKey *b1,
- struct GNUNET_CRYPTO_rsa_BlindingKey *b2);
+struct GNUNET_CRYPTO_RsaPublicKey *
+GNUNET_CRYPTO_rsa_public_key_dup (const struct GNUNET_CRYPTO_RsaPublicKey *key);
/**
* @return 0 if the two are equal
*/
int
-GNUNET_CRYPTO_rsa_signature_cmp (struct GNUNET_CRYPTO_rsa_Signature *s1,
- struct GNUNET_CRYPTO_rsa_Signature *s2);
+GNUNET_CRYPTO_rsa_signature_cmp (struct GNUNET_CRYPTO_RsaSignature *s1,
+ struct GNUNET_CRYPTO_RsaSignature *s2);
/**
* Compare the values of two private keys.
* @return 0 if the two are equal
*/
int
-GNUNET_CRYPTO_rsa_private_key_cmp (struct GNUNET_CRYPTO_rsa_PrivateKey *p1,
- struct GNUNET_CRYPTO_rsa_PrivateKey *p2);
+GNUNET_CRYPTO_rsa_private_key_cmp (struct GNUNET_CRYPTO_RsaPrivateKey *p1,
+ struct GNUNET_CRYPTO_RsaPrivateKey *p2);
/**
* @return 0 if the two are equal
*/
int
-GNUNET_CRYPTO_rsa_public_key_cmp (struct GNUNET_CRYPTO_rsa_PublicKey *p1,
- struct GNUNET_CRYPTO_rsa_PublicKey *p2);
-
-
-/**
- * Destroy a blinding key
- *
- * @param bkey the blinding key to destroy
- */
-void
-GNUNET_CRYPTO_rsa_blinding_key_free (struct GNUNET_CRYPTO_rsa_BlindingKey *bkey);
-
-
-/**
- * Encode the blinding key in a format suitable for
- * storing it into a file.
- *
- * @param bkey the blinding 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_blinding_key_encode (const struct GNUNET_CRYPTO_rsa_BlindingKey *bkey,
- char **buffer);
-
-
-/**
- * Decode the blinding 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_rsa_BlindingKey *
-GNUNET_CRYPTO_rsa_blinding_key_decode (const char *buf,
- size_t len);
+GNUNET_CRYPTO_rsa_public_key_cmp (struct GNUNET_CRYPTO_RsaPublicKey *p1,
+ struct GNUNET_CRYPTO_RsaPublicKey *p2);
/**
* @param hash hash of the message to sign
* @param bkey the blinding key
* @param pkey the public key of the signer
- * @param[out] buffer set to a buffer with the blinded message to be signed
- * @return number of bytes stored in @a buffer
+ * @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
*/
-size_t
+int
GNUNET_CRYPTO_rsa_blind (const struct GNUNET_HashCode *hash,
- struct GNUNET_CRYPTO_rsa_BlindingKey *bkey,
- struct GNUNET_CRYPTO_rsa_PublicKey *pkey,
- char **buffer);
+ const struct GNUNET_CRYPTO_RsaBlindingKeySecret *bks,
+ struct GNUNET_CRYPTO_RsaPublicKey *pkey,
+ char **buf,
+ size_t *buf_size);
/**
- * Sign the given message.
+ * 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_rsa_Signature *
-GNUNET_CRYPTO_rsa_sign (const struct GNUNET_CRYPTO_rsa_PrivateKey *key,
- const void *msg,
- size_t msg_len);
+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);
/**
* @param sig memory to free
*/
void
-GNUNET_CRYPTO_rsa_signature_free (struct GNUNET_CRYPTO_rsa_Signature *sig);
+GNUNET_CRYPTO_rsa_signature_free (struct GNUNET_CRYPTO_RsaSignature *sig);
/**
* @return size of memory allocated in @a buffer
*/
size_t
-GNUNET_CRYPTO_rsa_signature_encode (const struct GNUNET_CRYPTO_rsa_Signature *sig,
+GNUNET_CRYPTO_rsa_signature_encode (const struct GNUNET_CRYPTO_RsaSignature *sig,
char **buffer);
* @param len the length of the data in @a buf
* @return NULL on error
*/
-struct GNUNET_CRYPTO_rsa_Signature *
+struct GNUNET_CRYPTO_RsaSignature *
GNUNET_CRYPTO_rsa_signature_decode (const char *buf,
size_t len);
* @param sig the signature to duplicate
* @return the duplicate key; NULL upon error
*/
-struct GNUNET_CRYPTO_rsa_Signature *
-GNUNET_CRYPTO_rsa_signature_dup (const struct GNUNET_CRYPTO_rsa_Signature *sig);
+struct GNUNET_CRYPTO_RsaSignature *
+GNUNET_CRYPTO_rsa_signature_dup (const struct GNUNET_CRYPTO_RsaSignature *sig);
/**
* #GNUNET_CRYPTO_rsa_blind().
*
* @param sig the signature made on the blinded signature purpose
- * @param bkey the blinding key used to blind the 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 on error
+ * @return unblinded signature on success, NULL if RSA key is bad or malicious.
*/
-struct GNUNET_CRYPTO_rsa_Signature *
-GNUNET_CRYPTO_rsa_unblind (struct GNUNET_CRYPTO_rsa_Signature *sig,
- struct GNUNET_CRYPTO_rsa_BlindingKey *bkey,
- struct GNUNET_CRYPTO_rsa_PublicKey *pkey);
+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);
/**
* @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_OK if ok, #GNUNET_SYSERR if invalid
+ * @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_rsa_Signature *sig,
- const struct GNUNET_CRYPTO_rsa_PublicKey *public_key);
+ const struct GNUNET_CRYPTO_RsaSignature *sig,
+ const struct GNUNET_CRYPTO_RsaPublicKey *public_key);
#if 0 /* keep Emacsens' auto-indent happy */
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