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122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/* pkcs1-rsa-sha256.c
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PKCS stuff for rsa-sha256.
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Copyright (C) 2001, 2003, 2006 Niels Möller
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This file is part of GNU Nettle.
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GNU Nettle is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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GNU Nettle is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see http://www.gnu.org/licenses/.
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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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#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 "hogweed-internal.h"
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#include "gmp-glue.h"
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/* From RFC 3447, Public-Key Cryptography Standards (PKCS) #1: RSA
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* Cryptography Specifications Version 2.1.
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*
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* id-sha256 OBJECT IDENTIFIER ::=
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* {joint-iso-itu-t(2) country(16) us(840) organization(1)
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* gov(101) csor(3) nistalgorithm(4) hashalgs(2) 1}
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*/
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static const uint8_t
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sha256_prefix[] =
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{
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/* 19 octets prefix, 32 octets hash, total 51 */
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0x30, 49, /* SEQUENCE */
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0x30, 13, /* SEQUENCE */
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0x06, 9, /* OBJECT IDENTIFIER */
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0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01,
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0x05, 0, /* NULL */
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0x04, 32 /* OCTET STRING */
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/* Here comes the raw hash value */
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};
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int
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pkcs1_rsa_sha256_encode(mpz_t m, size_t key_size, struct sha256_ctx *hash)
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{
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uint8_t *p;
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TMP_GMP_DECL(em, uint8_t);
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TMP_GMP_ALLOC(em, key_size);
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p = _pkcs1_signature_prefix(key_size, em,
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sizeof(sha256_prefix),
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sha256_prefix,
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SHA256_DIGEST_SIZE);
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if (p)
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{
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sha256_digest(hash, SHA256_DIGEST_SIZE, p);
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nettle_mpz_set_str_256_u(m, key_size, em);
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TMP_GMP_FREE(em);
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return 1;
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}
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else
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{
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TMP_GMP_FREE(em);
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return 0;
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}
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}
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int
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pkcs1_rsa_sha256_encode_digest(mpz_t m, size_t key_size, const uint8_t *digest)
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{
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uint8_t *p;
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TMP_GMP_DECL(em, uint8_t);
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TMP_GMP_ALLOC(em, key_size);
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p = _pkcs1_signature_prefix(key_size, em,
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sizeof(sha256_prefix),
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sha256_prefix,
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SHA256_DIGEST_SIZE);
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if (p)
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{
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memcpy(p, digest, SHA256_DIGEST_SIZE);
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nettle_mpz_set_str_256_u(m, key_size, em);
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TMP_GMP_FREE(em);
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return 1;
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}
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else
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{
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TMP_GMP_FREE(em);
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return 0;
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}
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}
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