Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_pss_decode.c @ 1489:fdae6fae00af

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Removed commented out code
author Matt Johnston <matt@ucc.asn.au>
date Sun, 11 Feb 2018 23:03:31 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file pkcs_1_pss_decode.c
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13 PKCS #1 PSS Signature Padding, Tom St Denis
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14 */
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16 #ifdef LTC_PKCS_1
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18 /**
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19 PKCS #1 v2.00 PSS decode
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20 @param msghash The hash to verify
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21 @param msghashlen The length of the hash (octets)
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22 @param sig The signature data (encoded data)
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23 @param siglen The length of the signature data (octets)
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24 @param saltlen The length of the salt used (octets)
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25 @param hash_idx The index of the hash desired
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26 @param modulus_bitlen The bit length of the RSA modulus
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27 @param res [out] The result of the comparison, 1==valid, 0==invalid
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28 @return CRYPT_OK if successful (even if the comparison failed)
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29 */
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30 int pkcs_1_pss_decode(const unsigned char *msghash, unsigned long msghashlen,
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31 const unsigned char *sig, unsigned long siglen,
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32 unsigned long saltlen, int hash_idx,
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33 unsigned long modulus_bitlen, int *res)
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34 {
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35 unsigned char *DB, *mask, *salt, *hash;
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36 unsigned long x, y, hLen, modulus_len;
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37 int err;
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38 hash_state md;
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40 LTC_ARGCHK(msghash != NULL);
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41 LTC_ARGCHK(res != NULL);
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43 /* default to invalid */
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44 *res = 0;
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46 /* ensure hash is valid */
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47 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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48 return err;
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49 }
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51 hLen = hash_descriptor[hash_idx].hashsize;
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52 modulus_bitlen--;
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53 modulus_len = (modulus_bitlen>>3) + (modulus_bitlen & 7 ? 1 : 0);
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55 /* check sizes */
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56 if ((saltlen > modulus_len) ||
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57 (modulus_len < hLen + saltlen + 2)) {
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58 return CRYPT_PK_INVALID_SIZE;
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59 }
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61 /* allocate ram for DB/mask/salt/hash of size modulus_len */
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62 DB = XMALLOC(modulus_len);
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63 mask = XMALLOC(modulus_len);
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64 salt = XMALLOC(modulus_len);
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65 hash = XMALLOC(modulus_len);
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66 if (DB == NULL || mask == NULL || salt == NULL || hash == NULL) {
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67 if (DB != NULL) {
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68 XFREE(DB);
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69