3 * PKCS stuff for rsa-md5.
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., 59 Temple Place - Suite 330, Boston,
39 #include "nettle-internal.h"
43 * md5 OBJECT IDENTIFIER ::=
44 * {iso(1) member-body(2) US(840) rsadsi(113549) digestAlgorithm(2) 5}
46 * The parameters part of the algorithm identifier is NULL:
48 * md5Identifier ::= AlgorithmIdentifier {md5, NULL}
54 /* 18 octets prefix, 16 octets hash, 34 total. */
55 0x30, 32, /* SEQUENCE */
56 0x30, 12, /* SEQUENCE */
57 0x06, 8, /* OBJECT IDENTIFIER */
58 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05,
60 0x04, 16 /* OCTET STRING */
61 /* Here comes the raw hash value */
65 pkcs1_rsa_md5_encode(mpz_t m, unsigned size, struct md5_ctx *hash)
67 TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
70 if (pkcs1_signature_prefix(size, em,
75 md5_digest(hash, MD5_DIGEST_SIZE, em + size - MD5_DIGEST_SIZE);
76 nettle_mpz_set_str_256_u(m, size, em);
84 pkcs1_rsa_md5_encode_digest(mpz_t m, unsigned size, const uint8_t *digest)
86 TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
89 if (pkcs1_signature_prefix(size, em,
94 memcpy(em + size - MD5_DIGEST_SIZE, digest, MD5_DIGEST_SIZE);
95 nettle_mpz_set_str_256_u(m, size, em);