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comparison libtomcrypt/src/pk/pkcs1/pkcs_1_pss_encode.c @ 382:0cbe8f6dbf9e

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f) to branch 'au.asn.ucc.matt.dropbear' (head 02c413252c90e9de8e03d91e9939dde3029f5c0a)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:41:05 +0000
parents 1b9e69c058d2
children f849a5ca2efc
comparison
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379:b66a00272a90 382:0cbe8f6dbf9e
4 * algorithms in a highly modular and flexible manner. 4 * algorithms in a highly modular and flexible manner.
5 * 5 *
6 * The library is free for all purposes without any express 6 * The library is free for all purposes without any express
7 * guarantee it works. 7 * guarantee it works.
8 * 8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org 9 * Tom St Denis, [email protected], http://libtomcrypt.com
10 */ 10 */
11 #include "tomcrypt.h" 11 #include "tomcrypt.h"
12 12
13 /** 13 /**
14 @file pkcs_1_pss_encode.c 14 @file pkcs_1_pss_encode.c
116 DB[x++] = 0x01; 116 DB[x++] = 0x01;
117 XMEMCPY(DB + x, salt, saltlen); 117 XMEMCPY(DB + x, salt, saltlen);
118 x += saltlen; 118 x += saltlen;
119 119
120 /* generate mask of length modulus_len - hLen - 1 from hash */ 120 /* generate mask of length modulus_len - hLen - 1 from hash */
121 if ((err = pkcs_1_mgf1(hash, hLen, hash_idx, mask, modulus_len - hLen - 1)) != CRYPT_OK) { 121 if ((err = pkcs_1_mgf1(hash_idx, hash, hLen, mask, modulus_len - hLen - 1)) != CRYPT_OK) {
122 goto LBL_ERR; 122 goto LBL_ERR;
123 } 123 }
124 124
125 /* xor against DB */ 125 /* xor against DB */
126 for (y = 0; y < (modulus_len - hLen - 1); y++) { 126 for (y = 0; y < (modulus_len - hLen - 1); y++) {
127 DB[y] ^= mask[y]; 127 DB[y] ^= mask[y];
128 } 128 }
129 129
130 /* output is DB || hash || 0xBC */ 130 /* output is DB || hash || 0xBC */
131 if (*outlen < modulus_len) { 131 if (*outlen < modulus_len) {
132 *outlen = modulus_len;
132 err = CRYPT_BUFFER_OVERFLOW; 133 err = CRYPT_BUFFER_OVERFLOW;
133 goto LBL_ERR; 134 goto LBL_ERR;
134 } 135 }
135 136
136 /* DB len = modulus_len - hLen - 1 */ 137 /* DB len = modulus_len - hLen - 1 */
168 } 169 }
169 170
170 #endif /* PKCS_1 */ 171 #endif /* PKCS_1 */
171 172
172 /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_encode.c,v $ */ 173 /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_encode.c,v $ */
173 /* $Revision: 1.4 $ */ 174 /* $Revision: 1.7 $ */
174 /* $Date: 2005/05/05 14:35:59 $ */ 175 /* $Date: 2006/06/16 21:53:41 $ */