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author | Niels Möller <nisse@lysator.liu.se> | 2006-11-27 23:08:38 +0100 |
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committer | Niels Möller <nisse@lysator.liu.se> | 2006-11-27 23:08:38 +0100 |
commit | 81a882036321eaee33bf44a769e65dc446bb4c14 (patch) | |
tree | c9b326152902f1d886fedb8f47dd3969a5bcbc85 /pkcs1-rsa-sha256.c | |
parent | 75d006827a8fa18d928b59f31545d12b8600d157 (diff) | |
download | nettle-81a882036321eaee33bf44a769e65dc446bb4c14.tar.gz |
New files.
Rev: src/nettle/pkcs1-rsa-sha256.c:1.1
Rev: src/nettle/rsa-sha256-sign.c:1.1
Rev: src/nettle/rsa-sha256-verify.c:1.1
Diffstat (limited to 'pkcs1-rsa-sha256.c')
-rw-r--r-- | pkcs1-rsa-sha256.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/pkcs1-rsa-sha256.c b/pkcs1-rsa-sha256.c new file mode 100644 index 00000000..77f9d048 --- /dev/null +++ b/pkcs1-rsa-sha256.c @@ -0,0 +1,94 @@ +/* pkcs1-rsa-sha256.c + * + * PKCS stuff for rsa-sha256. + */ + +/* nettle, low-level cryptographics library + * + * Copyright (C) 2001, 2003, 2006 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 <assert.h> +#include <stdlib.h> +#include <string.h> + +#include "rsa.h" + +#include "bignum.h" +#include "pkcs1.h" + +#include "nettle-internal.h" + +/* From RFC 3447, Public-Key Cryptography Standards (PKCS) #1: RSA + * Cryptography Specifications Version 2.1. + * + * id-sha256 OBJECT IDENTIFIER ::= + * {joint-iso-itu-t(2) country(16) us(840) organization(1) + * gov(101) csor(3) nistalgorithm(4) hashalgs(2) 1} + */ + +static const uint8_t +sha256_prefix[] = +{ + /* 19 octets prefix, 32 octets hash, total 51 */ + 0x30, 49, /* SEQUENCE */ + 0x30, 13, /* SEQUENCE */ + 0x06, 9, /* OBJECT IDENTIFIER */ + 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, + 0x05, 0, /* NULL */ + 0x04, 32 /* OCTET STRING */ + /* Here comes the raw hash value */ +}; + +void +pkcs1_rsa_sha256_encode(mpz_t m, unsigned length, struct sha256_ctx *hash) +{ + TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8); + TMP_ALLOC(em, length); + + assert(length >= SHA256_DIGEST_SIZE); + pkcs1_signature_prefix(length - SHA256_DIGEST_SIZE, em, + sizeof(sha256_prefix), + sha256_prefix); + + sha256_digest(hash, SHA256_DIGEST_SIZE, em + length - SHA256_DIGEST_SIZE); + nettle_mpz_set_str_256_u(m, length, em); +} + +void +pkcs1_rsa_sha256_encode_digest(mpz_t m, unsigned length, const uint8_t *digest) +{ + TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8); + TMP_ALLOC(em, length); + + assert(length >= SHA256_DIGEST_SIZE); + pkcs1_signature_prefix(length - SHA256_DIGEST_SIZE, em, + sizeof(sha256_prefix), + sha256_prefix); + + memcpy(em + length - SHA256_DIGEST_SIZE, digest, SHA256_DIGEST_SIZE); + nettle_mpz_set_str_256_u(m, length, em); +} + +#endif /* WITH_PUBLIC_KEY */ |