Mercurial > dropbear

annotate src/pk/rsa/rsa_sign_hash.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
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children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file rsa_sign_hash.c
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15 RSA PKCS v2 PSS sign hash, Tom St Denis
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16 */
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17
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18 #ifdef MRSA
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19
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20 /**
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21 (PKCS #1, v2.0) PSS pad then sign
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22 @param in The hash to sign
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23 @param inlen The length of the hash to sign (octets)
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24 @param out [out] The signature
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25 @param outlen [in/out] The max size and resulting size of the signature
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26 @param prng An active PRNG state
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27 @param prng_idx The index of the PRNG desired
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28 @param hash_idx The index of the hash desired
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29 @param saltlen The length of the salt desired (octets)
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30 @param key The private RSA key to use
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31 @return CRYPT_OK if successful
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32 */
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33 int rsa_sign_hash(const unsigned char *in, unsigned long inlen,
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34 unsigned char *out, unsigned long *outlen,
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35 prng_state *prng, int prng_idx,
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36 int hash_idx, unsigned long saltlen,
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37 rsa_key *key)
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38 {
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39 unsigned long modulus_bitlen, modulus_bytelen, x;
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40 int err;
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41
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42 LTC_ARGCHK(in != NULL);
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43 LTC_ARGCHK(out != NULL);
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44 LTC_ARGCHK(outlen != NULL);
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45 LTC_ARGCHK(key != NULL);
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46
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47 /* valid prng and hash ? */
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48 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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49 return err;
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50 }
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51 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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52 return err;
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53 }
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54
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55 /* get modulus len in bits */
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56 modulus_bitlen = mp_count_bits(&(key->N));
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57
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58 /* outlen must be at least the size of the modulus */
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59 modulus_bytelen = mp_unsigned_bin_size(&(key->N));
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60 if (modulus_bytelen > *outlen) {
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61 return CRYPT_BUFFER_OVERFLOW;
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62 }
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63
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64 /* PSS pad the key */
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65 x = *outlen;
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66 if ((err = pkcs_1_pss_encode(in, inlen, saltlen, prng, prng_idx,
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67 hash_idx, modulus_bitlen, out, &x)) != CRYPT_OK) {
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68 return err;
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69 }
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70
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71 /* RSA encode it */
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72 return rsa_exptmod(out, x, out, outlen, PK_PRIVATE, key);
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73 }
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74
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75 #endif /* MRSA */