Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_verify_hash.c @ 376:4f2dbd1c3685 channel-fix

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Add some code for testing whether a writefd is closed (by read()ing from it)
author Matt Johnston <matt@ucc.asn.au>
date Tue, 05 Dec 2006 15:23:06 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
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285
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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_verify_hash.c
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15 RSA PKCS v2 PSS signature verification, 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) de-sign then PSS depad
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22 @param sig The signature data
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23 @param siglen The length of the signature data (octets)
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24 @param hash The hash of the message that was signed
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25 @param hashlen The length of the hash of the message that was signed (octets)
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26 @param hash_idx The index of the desired hash
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27 @param saltlen The length of the salt used during signature
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28 @param stat [out] The result of the signature comparison, 1==valid, 0==invalid
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29 @param key The public RSA key corresponding to the key that performed the signature
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30 @return CRYPT_OK on success (even if the signature is invalid)
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31 */
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32 int rsa_verify_hash(const unsigned char *sig, unsigned long siglen,
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33 const unsigned char *hash, unsigned long hashlen,
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34 int hash_idx, unsigned long saltlen,
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35 int *stat, rsa_key *key)
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36 {
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37 unsigned long modulus_bitlen, modulus_bytelen, x;
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38 int err;
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39 unsigned char *tmpbuf;
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40
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41 LTC_ARGCHK(hash != NULL);
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42 LTC_ARGCHK(sig != NULL);
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43 LTC_ARGCHK(stat != NULL);
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44 LTC_ARGCHK(key != NULL);
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45
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46 /* default to invalid */
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47 *stat = 0;
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48
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49 /* valid hash ? */
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50 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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51 return err;
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52 }
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53
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54 /* get modulus len in bits */
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55 modulus_bitlen = mp_count_bits(&(key->N));
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56
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57 /* outlen must be at least the size of the modulus */
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58 modulus_bytelen = mp_unsigned_bin_size(&(key->N));
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59 if (modulus_bytelen != siglen) {
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60 return CRYPT_INVALID_PACKET;
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61 }
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62
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63 /* allocate temp buffer for decoded sig */
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64 tmpbuf = XMALLOC(siglen);
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65 if (tmpbuf == NULL) {
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66 return CRYPT_MEM;
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67 }
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68
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69 /* RSA decode it */
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70 x = siglen;
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71 if ((err = rsa_exptmod(sig, siglen, tmpbuf, &x, PK_PUBLIC, key)) != CRYPT_OK) {
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72 XFREE(tmpbuf);
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73 return err;
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74 }
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75
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76 /* PSS decode it */
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77 err = pkcs_1_pss_decode(hash, hashlen, tmpbuf, x, saltlen, hash_idx, modulus_bitlen, stat);
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78 XFREE(tmpbuf);
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79 return err;
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80 }
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81
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82 #endif /* MRSA */
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83
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84 /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_verify_hash.c,v $ */
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85 /* $Revision: 1.3 $ */
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86 /* $Date: 2005/05/05 14:35:59 $ */