Mercurial > dropbear
view rsa_sign_hash.c @ 88:901233045998 libtomcrypt
Fix typo in the big-endian macros
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 02 Sep 2004 15:34:30 +0000 |
parents | 6362d3854bb4 |
children | 5d99163f7e32 |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, [email protected], http://libtomcrypt.org */ #include "mycrypt.h" #ifdef MRSA /* PSS pad then sign */ int rsa_sign_hash(const unsigned char *msghash, unsigned long msghashlen, unsigned char *sig, unsigned long *siglen, prng_state *prng, int prng_idx, int hash_idx, unsigned long saltlen, rsa_key *key) { unsigned long modulus_bitlen, modulus_bytelen, x; int err; _ARGCHK(msghash != NULL); _ARGCHK(sig != NULL); _ARGCHK(siglen != NULL); _ARGCHK(key != NULL); /* valid prng and hash ? */ if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) { return err; } if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { return err; } /* get modulus len in bits */ modulus_bitlen = mp_count_bits(&(key->N)); /* outlen must be at least the size of the modulus */ modulus_bytelen = mp_unsigned_bin_size(&(key->N)); if (modulus_bytelen > *siglen) { return CRYPT_BUFFER_OVERFLOW; } /* PSS pad the key */ x = *siglen; if ((err = pkcs_1_pss_encode(msghash, msghashlen, saltlen, prng, prng_idx, hash_idx, modulus_bitlen, sig, &x)) != CRYPT_OK) { return err; } /* RSA encode it */ return rsa_exptmod(sig, x, sig, siglen, PK_PRIVATE, prng, prng_idx, key); } #endif /* MRSA */