3 * PKCS stuff for rsa-sha1.
6 /* nettle, low-level cryptographics library
8 * Copyright (C) 2001, 2003 Niels Möller
10 * The nettle library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 of the License, or (at your
13 * option) any later version.
15 * The nettle library is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
18 * License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with the nettle library; see the file COPYING.LIB. If not, write to
22 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
39 #include "nettle-internal.h"
43 * id-sha1 OBJECT IDENTIFIER ::=
44 * {iso(1) identified-organization(3) oiw(14) secsig(3)
47 * The default hash function is SHA-1:
48 * sha1Identifier ::= AlgorithmIdentifier {id-sha1, NULL}
54 /* 15 octets prefix, 20 octets hash, total 35 */
55 0x30, 33, /* SEQUENCE */
56 0x30, 9, /* SEQUENCE */
57 0x06, 5, /* OBJECT IDENTIFIER */
58 0x2b, 0x0e, 0x03, 0x02, 0x1a,
60 0x04, 20 /* OCTET STRING */
61 /* Here comes the raw hash value */
65 pkcs1_rsa_sha1_encode(mpz_t m, unsigned key_size, struct sha1_ctx *hash)
68 TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
69 TMP_ALLOC(em, key_size);
71 p = _pkcs1_signature_prefix(key_size, em,
77 sha1_digest(hash, SHA1_DIGEST_SIZE, p);
78 nettle_mpz_set_str_256_u(m, key_size, em);
86 pkcs1_rsa_sha1_encode_digest(mpz_t m, unsigned key_size, const uint8_t *digest)
89 TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_SIZE);
90 TMP_ALLOC(em, key_size);
92 p = _pkcs1_signature_prefix(key_size, em,
98 memcpy(p, digest, SHA1_DIGEST_SIZE);
99 nettle_mpz_set_str_256_u(m, key_size, em);