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/* rsa-compat.c
*
* The RSA publickey algorithm, RSAREF compatible interface.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "rsa-compat.h"
#include "bignum.h"
#include "md5.h"
int
R_SignInit(R_SIGNATURE_CTX *ctx,
int digestAlgorithm)
{
if (digestAlgorithm != DA_MD5)
return RE_DIGEST_ALGORITHM;
md5_init(&ctx->hash);
return 0;
}
int
R_SignUpdate(R_SIGNATURE_CTX *ctx,
const uint8_t *data,
/* Length is an unsigned char according to rsaref.txt,
* but that must be a typo. */
unsigned length)
{
md5_update(&ctx->hash, length, data);
return RE_SUCCESS;
}
int
R_SignFinal(R_SIGNATURE_CTX *ctx,
uint8_t *signature,
unsigned *length,
R_RSA_PRIVATE_KEY *key)
{
struct rsa_private_key k;
int res;
nettle_mpz_init_set_str_256_u(k.p,
MAX_RSA_MODULUS_LEN, key->prime[0]);
nettle_mpz_init_set_str_256_u(k.q,
MAX_RSA_MODULUS_LEN, key->prime[1]);
nettle_mpz_init_set_str_256_u(k.a,
MAX_RSA_MODULUS_LEN, key->primeExponent[0]);
nettle_mpz_init_set_str_256_u(k.b,
MAX_RSA_MODULUS_LEN, key->primeExponent[1]);
nettle_mpz_init_set_str_256_u(k.c,
MAX_RSA_MODULUS_LEN, key->coefficient);
if (rsa_private_key_prepare(&k) && (k.size <= MAX_RSA_MODULUS_LEN))
{
mpz_t s;
mpz_init(s);
if (rsa_md5_sign(&k, &ctx->hash, s))
{
nettle_mpz_get_str_256(k.size, signature, s);
*length = k.size;
res = RE_SUCCESS;
}
else
res = RE_PRIVATE_KEY;
mpz_clear(s);
}
else
res = RE_PRIVATE_KEY;
mpz_clear(k.p);
mpz_clear(k.q);
mpz_clear(k.a);
mpz_clear(k.b);
mpz_clear(k.c);
return res;
}
int
R_VerifyInit(R_SIGNATURE_CTX *ctx,
int digestAlgorithm)
{
return R_SignInit(ctx, digestAlgorithm);
}
int
R_VerifyUpdate(R_SIGNATURE_CTX *ctx,
const uint8_t *data,
/* Length is an unsigned char according to rsaref.txt,
* but that must be a typo. */
unsigned length)
{
return R_SignUpdate(ctx, data, length);
}
int
R_VerifyFinal(R_SIGNATURE_CTX *ctx,
uint8_t *signature,
unsigned length,
R_RSA_PUBLIC_KEY *key)
{
struct rsa_public_key k;
int res;
nettle_mpz_init_set_str_256_u(k.n,
MAX_RSA_MODULUS_LEN, key->modulus);
nettle_mpz_init_set_str_256_u(k.e,
MAX_RSA_MODULUS_LEN, key->exponent);
if (rsa_public_key_prepare(&k) && (k.size == length))
{
mpz_t s;
nettle_mpz_init_set_str_256_u(s,
k.size, signature);
res = rsa_md5_verify(&k, &ctx->hash, s)
? RE_SUCCESS : RE_SIGNATURE;
mpz_clear(s);
}
else
res = RE_PUBLIC_KEY;
mpz_clear(k.n);
mpz_clear(k.e);
return res;
}
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