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/* rsa-compat.c
The RSA publickey algorithm, RSAREF compatible interface.
Copyright (C) 2001 Niels Möller
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle 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
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
*/
#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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