Mercurial > dropbear

annotate src/pk/rsa/rsa_v15_sign_hash.c @ 199:8be64e2c86f4 libtomcrypt

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* SMALL_CODE is now LTC_SMALL_CODE
author Matt Johnston <matt@ucc.asn.au>
date Tue, 10 May 2005 17:02:59 +0000
parents 1c15b283127b
children
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191
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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_v15_sign_hash.c
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15 RSA PKCS v1.5 Signature, 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 v1.5 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 message hash (octets)
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24 @param out [out] The signature
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25 @param siglen [in/out] The max size and resulting size of the signature
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26 @param hash_idx The index of the hash desired
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27 @param key The private RSA key to perform the signature with
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28 @return CRYPT_OK if successful
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29 */
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30 int rsa_v15_sign_hash(const unsigned char *in, unsigned long inlen,
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31 unsigned char *out, unsigned long *siglen,
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32 int hash_idx, rsa_key *key)
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33 {
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34 unsigned long modulus_bitlen, modulus_bytelen, x;
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35 int err;
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36
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37 LTC_ARGCHK(in != NULL);
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38 LTC_ARGCHK(out != NULL);
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39 LTC_ARGCHK(siglen != NULL);
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40 LTC_ARGCHK(key != NULL);
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41
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42 /* valid hash ? */
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43 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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44 return err;
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45 }
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46
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47 /* get modulus len in bits */
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48 modulus_bitlen = mp_count_bits(&(key->N));
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49
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50 /* outlen must be at least the size of the modulus */
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51 modulus_bytelen = mp_unsigned_bin_size(&(key->N));
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52 if (modulus_bytelen > *siglen) {
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53 return CRYPT_BUFFER_OVERFLOW;
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54 }
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55
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56 /* PKCS #1 v1.5 pad the key */
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57 x = *siglen;
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58 if ((err = pkcs_1_v15_sa_encode(in, inlen, hash_idx, modulus_bitlen, out, &x)) != CRYPT_OK) {
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59 return err;
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60 }
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61
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62 /* RSA encode it */
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63 return rsa_exptmod(out, x, out, siglen, PK_PRIVATE, key);
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64 }
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65
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66 #endif