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Diffstat (limited to 'src/include/gnunet_crypto_lib.h')
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diff --git a/src/include/gnunet_crypto_lib.h b/src/include/gnunet_crypto_lib.h new file mode 100644 index 0000000..6e37266 --- /dev/null +++ b/src/include/gnunet_crypto_lib.h @@ -0,0 +1,882 @@ +/* + This file is part of GNUnet. + (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 Christian Grothoff (and other contributing authors) + + 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 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. +*/ + +/** + * @file include/gnunet_crypto_lib.h + * @brief cryptographic primitives for GNUnet + * + * @author Christian Grothoff + * @author Krista Bennett + * @author Gerd Knorr <kraxel@bytesex.org> + * @author Ioana Patrascu + * @author Tzvetan Horozov + */ + +#ifndef GNUNET_CRYPTO_LIB_H +#define GNUNET_CRYPTO_LIB_H + +#ifdef __cplusplus +extern "C" +{ +#if 0 /* keep Emacsens' auto-indent happy */ +} +#endif +#endif + +#include "gnunet_common.h" +#include "gnunet_scheduler_lib.h" + +/** + * Desired quality level for cryptographic operations. + */ +enum GNUNET_CRYPTO_Quality +{ + /** + * No good quality of the operation is needed (i.e., + * random numbers can be pseudo-random). + */ + GNUNET_CRYPTO_QUALITY_WEAK, + + /** + * High-quality operations are desired. + */ + GNUNET_CRYPTO_QUALITY_STRONG, + + /** + * Randomness for IVs etc. is required. + */ + GNUNET_CRYPTO_QUALITY_NONCE +}; + + +/** + * @brief length of the sessionkey in bytes (256 BIT sessionkey) + */ +#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 + +/** + * The private information of an RSA key pair. + */ +struct GNUNET_CRYPTO_RsaPrivateKey; + + +/** + * @brief 0-terminated ASCII encoding of a GNUNET_HashCode. + */ +struct GNUNET_CRYPTO_HashAsciiEncoded +{ + unsigned char encoding[104]; +}; + + + +/** + * @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 + * this must be followed by "size - 8" bytes of + * the actual signed data + */ +struct GNUNET_CRYPTO_RsaSignaturePurpose +{ + /** + * How many bytes does this signature sign? + * (including this purpose header); in network + * byte order (!). + */ + uint32_t size GNUNET_PACKED; + + /** + * What does this signature vouch for? This + * must contain a GNUNET_SIGNATURE_PURPOSE_XXX + * constant (from gnunet_signatures.h). In + * network byte order! + */ + uint32_t purpose GNUNET_PACKED; + +}; + + +/** + * @brief A public key. + */ +struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded +{ + /** + * In big-endian, must be GNUNET_CRYPTO_RSA_KEY_LENGTH+4 + */ + uint16_t len GNUNET_PACKED; + + /** + * Size of n in key; in big-endian! + */ + uint16_t sizen GNUNET_PACKED; + + /** + * The key itself, contains n followed by e. + */ + unsigned char key[GNUNET_CRYPTO_RSA_KEY_LENGTH]; + + /** + * Padding (must be 0) + */ + uint16_t padding GNUNET_PACKED; +}; + + +/** + * RSA Encrypted data. + */ +struct GNUNET_CRYPTO_RsaEncryptedData +{ + unsigned char encoding[GNUNET_CRYPTO_RSA_DATA_ENCODING_LENGTH]; +}; + + +/** + * @brief type for session keys + */ +struct GNUNET_CRYPTO_AesSessionKey +{ + /** + * Actual key. + */ + unsigned char key[GNUNET_CRYPTO_AES_KEY_LENGTH]; + + /** + * checksum! + */ + uint32_t crc32 GNUNET_PACKED; +}; +GNUNET_NETWORK_STRUCT_END + +/** + * @brief IV for sym cipher + * + * NOTE: must be smaller (!) in size than the + * GNUNET_HashCode. + */ +struct GNUNET_CRYPTO_AesInitializationVector +{ + unsigned char iv[GNUNET_CRYPTO_AES_KEY_LENGTH / 2]; +}; + + +/** + * @brief type for (message) authentication keys + */ +struct GNUNET_CRYPTO_AuthKey +{ + unsigned char key[GNUNET_CRYPTO_HASH_LENGTH]; +}; + + +/* **************** Functions and Macros ************* */ + +/** + * 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); + + +/** + * 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 hdr, 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); + + +/** + * 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 hdr, must be multiple of 2 + * @return crc16 value + */ +uint16_t +GNUNET_CRYPTO_crc16_n (const void *buf, size_t len); + + +/** + * 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 + * @return the resulting CRC32 checksum + */ +int32_t +GNUNET_CRYPTO_crc32_n (const void *buf, size_t len); + + +/** + * 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). + */ +uint32_t +GNUNET_CRYPTO_random_u32 (enum GNUNET_CRYPTO_Quality mode, uint32_t i); + + +/** + * 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) + * @return random 64-bit number + */ +uint64_t +GNUNET_CRYPTO_random_u64 (enum GNUNET_CRYPTO_Quality mode, uint64_t max); + + +/** + * 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 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); + + +/** + * Create a new 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); + + +/** + * Encrypt a block with the public key of another + * host that uses the same cyper. + * + * @param block the block to encrypt + * @param len the size of the 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); + + +/** + * Decrypt a given block with the sessionkey. + * + * @param block the data to decrypt, encoded as returned by encrypt + * @param size how big is the block? + * @param sessionkey the key used to decrypt + * @param iv the initialization vector to use + * @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); + + +/** + * @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 ... 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, ...); + + +/** + * @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 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); + + +/** + * 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); + + +/** + * Convert ASCII encoding back to GNUNET_CRYPTO_hash + * + * @param enc the encoding + * @param enclen number of characters in 'enc' (without 0-terminator, which can be missing) + * @param result where to store the GNUNET_CRYPTO_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, + GNUNET_HashCode * result); + + +/** + * Convert ASCII encoding back to GNUNET_CRYPTO_hash + * @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 + */ +#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. + * + * @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); + + +/** + * Compute hash of a given block. + * + * @param block the data to hash + * @param size size of the block + * @param ret pointer to where to write the hashcode + */ +void +GNUNET_CRYPTO_hash (const void *block, size_t size, GNUNET_HashCode * ret); + + +/** + * Calculate HMAC of a message (RFC 2104) + * + * @param key secret key + * @param plaintext input plaintext + * @param plaintext_len length of plaintext + * @param hmac where to store the hmac + */ +void +GNUNET_CRYPTO_hmac (const struct GNUNET_CRYPTO_AuthKey *key, + const void *plaintext, size_t plaintext_len, + GNUNET_HashCode * hmac); + + +/** + * Function called once the hash computation over the + * specified file has completed. + * + * @param cls closure + * @param res resulting hash, NULL on error + */ +typedef void (*GNUNET_CRYPTO_HashCompletedCallback) (void *cls, + const GNUNET_HashCode * + res); + + +/** + * Handle to file hashing operation. + */ +struct GNUNET_CRYPTO_FileHashContext; + +/** + * 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 + * @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); + + +/** + * Cancel a file hashing operation. + * + * @param fhc operation to cancel (callback must not yet have been invoked) + */ +void +GNUNET_CRYPTO_hash_file_cancel (struct GNUNET_CRYPTO_FileHashContext *fhc); + + +/** + * 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); + + +/** + * compute result(delta) = b - a + * + * @param a some hash code + * @param b some hash code + * @param result set to b - a + */ +void +GNUNET_CRYPTO_hash_difference (const GNUNET_HashCode * a, + const GNUNET_HashCode * b, + GNUNET_HashCode * result); + + +/** + * compute result(b) = a + delta + * + * @param a some hash code + * @param delta some hash code + * @param result set to a + delta + */ +void +GNUNET_CRYPTO_hash_sum (const GNUNET_HashCode * a, + const GNUNET_HashCode * delta, + GNUNET_HashCode * result); + + +/** + * compute result = a ^ b + * + * @param a some hash code + * @param b some hash code + * @param result set to a ^ b + */ +void +GNUNET_CRYPTO_hash_xor (const GNUNET_HashCode * a, const GNUNET_HashCode * b, + GNUNET_HashCode * result); + + +/** + * 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); + + +/** + * Obtain a bit from a hashcode. + * + * @param code the GNUNET_CRYPTO_hash 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); + +/** + * Determine how many low order bits match in two + * 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); + + +/** + * 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. + */ +int +GNUNET_CRYPTO_hash_cmp (const GNUNET_HashCode * h1, const GNUNET_HashCode * h2); + + +/** + * 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. + */ +int +GNUNET_CRYPTO_hash_xorcmp (const GNUNET_HashCode * h1, + const GNUNET_HashCode * h2, + const GNUNET_HashCode * target); + + +/** + * @brief Derive an authentication key + * @param key authentication key + * @param rkey root key + * @param salt salt + * @param salt_len size of the salt + * @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); + + +/** + * @brief Derive an authentication key + * @param key authentication key + * @param rkey root key + * @param salt salt + * @param salt_len size of the salt + * @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, ...); + +/** + * @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 skm source key material + * @param skm_len length of skm + * @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, ...); + + +/** + * @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 skm source key material + * @param skm_len length of skm + * @param argp va_list of void * & size_t pairs for context chunks + * @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); + + +/** + * @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 skm source key material + * @param skm_len length of skm + * @param argp va_list of void * & size_t pairs for context chunks + * @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); + + +/** + * @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 skm source key material + * @param skm_len length of skm + * @param ... void * & size_t pairs for context chunks + * @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, ...); + + +/** + * Create a new private key. Caller must free return value. + * + * @return fresh private key + */ +struct GNUNET_CRYPTO_RsaPrivateKey * +GNUNET_CRYPTO_rsa_key_create (void); + +/** + * 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 'buffer' + */ +struct GNUNET_CRYPTO_RsaPrivateKey * +GNUNET_CRYPTO_rsa_decode_key (const char *buf, uint16_t len); + +/** + * 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 for storage + * @return new private key, NULL on error (for example, + * permission denied) + */ +struct GNUNET_CRYPTO_RsaPrivateKey * +GNUNET_CRYPTO_rsa_key_create_from_file (const char *filename); + + +/** + * Deterministically (!) create a private key using only the + * given HashCode as input to the PRNG. + * + * @param hc "random" input to PRNG + * @return some private key purely dependent on input + */ +struct GNUNET_CRYPTO_RsaPrivateKey * +GNUNET_CRYPTO_rsa_key_create_from_hash (const GNUNET_HashCode * hc); + + +/** + * Free memory occupied by the private key. + * @param hostkey pointer to the memory to free + */ +void +GNUNET_CRYPTO_rsa_key_free (struct GNUNET_CRYPTO_RsaPrivateKey *hostkey); + + +/** + * Extract the public key of the host. + * + * @param priv the private key + * @param pub where to write the public key + */ +void +GNUNET_CRYPTO_rsa_key_get_public (const struct GNUNET_CRYPTO_RsaPrivateKey + *priv, + struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded + *pub); + + +/** + * Encrypt a block with the public key of another host that uses the + * same cyper. + * + * @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 + */ +int +GNUNET_CRYPTO_rsa_encrypt (const void *block, size_t size, + const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded + *publicKey, + struct GNUNET_CRYPTO_RsaEncryptedData *target); + + +/** + * Decrypt a given block with the hostkey. + * + * @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 + */ +ssize_t +GNUNET_CRYPTO_rsa_decrypt (const struct GNUNET_CRYPTO_RsaPrivateKey *key, + const struct GNUNET_CRYPTO_RsaEncryptedData *block, + void *result, size_t max); + + +/** + * Sign a given block. + * + * @param key 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_rsa_sign (const struct GNUNET_CRYPTO_RsaPrivateKey *key, + const struct GNUNET_CRYPTO_RsaSignaturePurpose *purpose, + struct GNUNET_CRYPTO_RsaSignature *sig); + + +/** + * Verify signature. Note that the caller MUST have already + * checked that "validate->size" bytes are actually available. + * + * @param purpose what is the purpose that validate 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 + */ +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); + + + +/** + * This function should only be called in testcases + * where strong entropy gathering is not desired + * (for example, for hostkey generation). + */ +void +GNUNET_CRYPTO_random_disable_entropy_gathering (void); + +#if 0 /* keep Emacsens' auto-indent happy */ +{ +#endif +#ifdef __cplusplus +} +#endif + + +/* ifndef GNUNET_CRYPTO_LIB_H */ +#endif +/* end of gnunet_crypto_lib.h */ |