Mercurial > dropbear

comparison pkcs_1_pss_encode.c @ 15:6362d3854bb4 libtomcrypt-orig

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
0.96 release of LibTomCrypt
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:07:21 +0000
parents 7faae8f46238
children 5d99163f7e32
comparison
equal deleted inserted replaced
3:7faae8f46238 15:6362d3854bb4
13 /* PKCS #1 PSS Signature Padding -- Tom St Denis */ 13 /* PKCS #1 PSS Signature Padding -- Tom St Denis */
14 14
15 #ifdef PKCS_1 15 #ifdef PKCS_1
16 16
17 int pkcs_1_pss_encode(const unsigned char *msghash, unsigned long msghashlen, 17 int pkcs_1_pss_encode(const unsigned char *msghash, unsigned long msghashlen,
18 unsigned long saltlen, int hash_idx, 18 unsigned long saltlen, prng_state *prng,
19 int prng_idx, prng_state *prng, 19 int prng_idx, int hash_idx,
20 unsigned long modulus_bitlen, 20 unsigned long modulus_bitlen,
21 unsigned char *out, unsigned long *outlen) 21 unsigned char *out, unsigned long *outlen)
22 { 22 {
23 unsigned char DB[1024], mask[sizeof(DB)], salt[sizeof(DB)], hash[sizeof(DB)]; 23 unsigned char DB[1024], mask[sizeof(DB)], salt[sizeof(DB)], hash[sizeof(DB)];
24 unsigned long x, y, hLen, modulus_len; 24 unsigned long x, y, hLen, modulus_len;
102 } 102 }
103 /* 0xBC */ 103 /* 0xBC */
104 out[y] = 0xBC; 104 out[y] = 0xBC;
105 105
106 /* now clear the 8*modulus_len - modulus_bitlen most significant bits */ 106 /* now clear the 8*modulus_len - modulus_bitlen most significant bits */
107 out[0] &= 0xFF >> ((modulus_len<<3) - modulus_bitlen); 107 out[0] &= 0xFF >> ((modulus_len<<3) - (modulus_bitlen-1));
108 108
109 /* store output size */ 109 /* store output size */
110 *outlen = modulus_len; 110 *outlen = modulus_len;
111 111
112 #ifdef CLEAN_STACK 112 #ifdef CLEAN_STACK