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by Marek Habersack
Import upstream version 1.10 |
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/* pkcs1-rsa-md5.c
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*
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* PKCS stuff for rsa-md5.
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*/
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/* nettle, low-level cryptographics library
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*
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* Copyright (C) 2001, 2003 Niels Möller
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*
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* The nettle library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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*
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* The nettle library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with the nettle library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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* MA 02111-1307, USA.
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*/
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#if HAVE_CONFIG_H
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# include "config.h"
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#endif
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#if WITH_PUBLIC_KEY
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#include <assert.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "rsa.h" |
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#include "bignum.h" |
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#include "pkcs1.h" |
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#include "nettle-internal.h" |
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/* From pkcs-1v2
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*
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* id-sha1 OBJECT IDENTIFIER ::=
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* {iso(1) identified-organization(3) oiw(14) secsig(3)
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* algorithms(2) 26}
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*
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* The default hash function is SHA-1:
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* sha1Identifier ::= AlgorithmIdentifier {id-sha1, NULL}
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*/
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static const uint8_t |
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sha1_prefix[] = |
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{
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/* 15 octets prefix, 20 octets hash, total 35 */
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0x30, 33, /* SEQUENCE */ |
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0x30, 9, /* SEQUENCE */ |
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0x06, 5, /* OBJECT IDENTIFIER */ |
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0x2b, 0x0e, 0x03, 0x02, 0x1a, |
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0x05, 0, /* NULL */ |
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0x04, 20 /* OCTET STRING */ |
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/* Here comes the raw hash value */
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};
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void
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pkcs1_rsa_sha1_encode(mpz_t m, unsigned length, struct sha1_ctx *hash) |
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{
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TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8); |
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TMP_ALLOC(em, length); |
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assert(length >= SHA1_DIGEST_SIZE); |
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pkcs1_signature_prefix(length - SHA1_DIGEST_SIZE, em, |
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sizeof(sha1_prefix), |
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sha1_prefix); |
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sha1_digest(hash, SHA1_DIGEST_SIZE, em + length - SHA1_DIGEST_SIZE); |
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nettle_mpz_set_str_256_u(m, length, em); |
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}
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void
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pkcs1_rsa_sha1_encode_digest(mpz_t m, unsigned length, const uint8_t *digest) |
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{
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TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8); |
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TMP_ALLOC(em, length); |
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assert(length >= SHA1_DIGEST_SIZE); |
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pkcs1_signature_prefix(length - SHA1_DIGEST_SIZE, em, |
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sizeof(sha1_prefix), |
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sha1_prefix); |
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memcpy(em + length - SHA1_DIGEST_SIZE, digest, SHA1_DIGEST_SIZE); |
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nettle_mpz_set_str_256_u(m, length, em); |
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}
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#endif /* WITH_PUBLIC_KEY */ |