diff options
author | Niels Möller <nisse@lysator.liu.se> | 2003-01-23 23:33:00 +0100 |
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committer | Niels Möller <nisse@lysator.liu.se> | 2003-01-23 23:33:00 +0100 |
commit | 97453327a55aeaaebd620a7d1776fba694f6d727 (patch) | |
tree | 9b7ee6a0c1b652da9179c3f5e4c6978f7a3653fb /pkcs1-rsa-sha1.c | |
parent | fbc4af20b71ac6c05d8e5a4423b0c12c10f351c7 (diff) | |
download | nettle-97453327a55aeaaebd620a7d1776fba694f6d727.tar.gz |
New files.
(pkcs1_signature_prefix): New function.
Rev: src/nettle/pkcs1-rsa-md5.c:1.1
Rev: src/nettle/pkcs1-rsa-sha1.c:1.1
Rev: src/nettle/pkcs1.c:1.1
Rev: src/nettle/pkcs1.h:1.1
Diffstat (limited to 'pkcs1-rsa-sha1.c')
-rw-r--r-- | pkcs1-rsa-sha1.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/pkcs1-rsa-sha1.c b/pkcs1-rsa-sha1.c new file mode 100644 index 00000000..95174119 --- /dev/null +++ b/pkcs1-rsa-sha1.c @@ -0,0 +1,92 @@ +/* pkcs1-rsa-md5.c + * + * PKCS stuff for rsa-md5. + */ + +/* nettle, low-level cryptographics library + * + * Copyright (C) 2001, 2003 Niels Möller + * + * The nettle library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation; either version 2.1 of the License, or (at your + * option) any later version. + * + * The nettle library is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public + * License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with the nettle library; see the file COPYING.LIB. If not, write to + * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, + * MA 02111-1307, USA. + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#if WITH_PUBLIC_KEY + +#include "rsa.h" + +#include "bignum.h" +#include "pkcs1.h" + +#include <assert.h> +#include <stdlib.h> +#include <string.h> + +/* From pkcs-1v2 + * + * id-sha1 OBJECT IDENTIFIER ::= + * {iso(1) identified-organization(3) oiw(14) secsig(3) + * algorithms(2) 26} + * + * The default hash function is SHA-1: + * sha1Identifier ::= AlgorithmIdentifier {id-sha1, NULL} + */ + +static const uint8_t +sha1_prefix[] = +{ + /* 15 octets prefix, 20 octets hash, total 35 */ + 0x30, 33, /* SEQUENCE */ + 0x30, 9, /* SEQUENCE */ + 0x06, 5, /* OBJECT IDENTIFIER */ + 0x2b, 0x0e, 0x03, 0x02, 0x1a, + 0x05, 0, /* NULL */ + 0x04, 20 /* OCTET STRING */ + /* Here comes the raw hash value */ +}; + +void +pkcs1_rsa_sha1_encode(mpz_t m, unsigned length, struct sha1_ctx *hash) +{ + uint8_t *em = alloca(length); + + assert(length >= SHA1_DIGEST_SIZE); + pkcs1_signature_prefix(length - SHA1_DIGEST_SIZE, em, + sizeof(sha1_prefix), + sha1_prefix); + + sha1_digest(hash, SHA1_DIGEST_SIZE, em + length - SHA1_DIGEST_SIZE); + nettle_mpz_set_str_256_u(m, length, em); +} + +void +pkcs1_rsa_sha1_encode_digest(mpz_t m, unsigned length, const uint8_t *digest) +{ + uint8_t *em = alloca(length); + + assert(length >= SHA1_DIGEST_SIZE); + pkcs1_signature_prefix(length - SHA1_DIGEST_SIZE, em, + sizeof(sha1_prefix), + sha1_prefix); + + memcpy(em + length - SHA1_DIGEST_SIZE, digest, SHA1_DIGEST_SIZE); + nettle_mpz_set_str_256_u(m, length, em); +} + +#endif /* WITH_PUBLIC_KEY */ |