This file is part of GNUnet.
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 3, 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.
+ Affero 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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+ SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @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.
#endif
#endif
-/**
- * @brief A 512-bit hashcode
- */
-struct GNUNET_HashCode;
/**
* 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.
/**
- * Public ECC key (always for Curve25519) encoded in a format suitable
- * for network transmission and EdDSA signatures.
+ * Public ECC key (always for curve Ed25519) encoded in a format
+ * suitable for network transmission and EdDSA signatures.
*/
struct GNUNET_CRYPTO_EddsaPublicKey
{
/**
- * Q consists of an x- and a y-value, each mod p (256 bits), given
- * here in affine coordinates and Ed25519 standard compact format.
+ * Point Q consists of a y-value mod p (256 bits); the x-value is
+ * always positive. The point is stored in Ed25519 standard
+ * compact format.
*/
unsigned char q_y[256 / 8];
/**
- * Paillier public key.
+ * Paillier private key.
*/
struct GNUNET_CRYPTO_PaillierPrivateKey
{
GNUNET_CRYPTO_crc32_n (const void *buf,
size_t len);
+/**
+ * @ingroup crypto
+ * Zero out @a buffer, securely against compiler optimizations.
+ * Used to delete key material.
+ *
+ * @param buffer the buffer to zap
+ * @param length buffer length
+ */
+void
+GNUNET_CRYPTO_zero_keys (void *buffer,
+ size_t length);
+
/**
* @ingroup crypto
GNUNET_CRYPTO_hash_context_abort (struct GNUNET_HashContext *hc);
+/**
+ * Calculate HMAC of a message (RFC 2104)
+ * TODO: Shouldn' this be the standard hmac function and
+ * the above be renamed?
+ *
+ * @param key secret key
+ * @param key_len secret key length
+ * @param plaintext input plaintext
+ * @param plaintext_len length of @a plaintext
+ * @param hmac where to store the hmac
+ */
+void
+GNUNET_CRYPTO_hmac_raw (const void *key, size_t key_len,
+ const void *plaintext, size_t plaintext_len,
+ struct GNUNET_HashCode *hmac);
+
+
/**
* @ingroup hash
* Calculate HMAC of a message (RFC 2104)
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.
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.
*/
*
* @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,
- unsigned int mem);
+ unsigned int mem);
/**
*
* @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,
*/
size_t
GNUNET_CRYPTO_rsa_private_key_encode (const struct GNUNET_CRYPTO_RsaPrivateKey *key,
- char **buffer);
+ char **buffer);
/**
*/
struct GNUNET_CRYPTO_RsaPrivateKey *
GNUNET_CRYPTO_rsa_private_key_decode (const char *buf,
- size_t len);
+ size_t len);
/**
*/
struct GNUNET_CRYPTO_RsaPublicKey *
GNUNET_CRYPTO_rsa_public_key_decode (const char *buf,
- size_t len);
+ size_t len);
/**
*/
int
GNUNET_CRYPTO_rsa_signature_cmp (struct GNUNET_CRYPTO_RsaSignature *s1,
- struct GNUNET_CRYPTO_RsaSignature *s2);
+ struct GNUNET_CRYPTO_RsaSignature *s2);
/**
* Compare the values of two private keys.
*/
int
GNUNET_CRYPTO_rsa_private_key_cmp (struct GNUNET_CRYPTO_RsaPrivateKey *p1,
- struct GNUNET_CRYPTO_RsaPrivateKey *p2);
+ struct GNUNET_CRYPTO_RsaPrivateKey *p2);
/**
*/
int
GNUNET_CRYPTO_rsa_public_key_cmp (struct GNUNET_CRYPTO_RsaPublicKey *p1,
- struct GNUNET_CRYPTO_RsaPublicKey *p2);
+ struct GNUNET_CRYPTO_RsaPublicKey *p2);
/**
* Blinds the given message with the given blinding key
*
* @param hash hash of the message to sign
- * @param bks the blinding key secret
+ * @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,
const struct GNUNET_CRYPTO_RsaBlindingKeySecret *bks,
struct GNUNET_CRYPTO_RsaPublicKey *pkey,
- char **buffer);
+ char **buf,
+ size_t *buf_size);
/**
*
* @param key private key to use for the signing
* @param hash the hash of the message to sign
- * @return NULL on error, signature on success
+ * @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,
*/
size_t
GNUNET_CRYPTO_rsa_signature_encode (const struct GNUNET_CRYPTO_RsaSignature *sig,
- char **buffer);
+ char **buffer);
/**
*/
struct GNUNET_CRYPTO_RsaSignature *
GNUNET_CRYPTO_rsa_signature_decode (const char *buf,
- size_t len);
+ size_t len);
/**
* @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 on error
+ * @return unblinded signature on success, NULL if RSA key is bad or malicious.
*/
struct GNUNET_CRYPTO_RsaSignature *
-GNUNET_CRYPTO_rsa_unblind (struct GNUNET_CRYPTO_RsaSignature *sig,
+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,
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