3 * The RSA publickey algorithm, RSAREF compatible interface.
6 /* nettle, low-level cryptographics library
8 * Copyright (C) 2001 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., 51 Franklin Street, Fifth Floor, Boston,
30 #include "rsa-compat.h"
36 R_SignInit(R_SIGNATURE_CTX *ctx,
39 if (digestAlgorithm != DA_MD5)
40 return RE_DIGEST_ALGORITHM;
48 R_SignUpdate(R_SIGNATURE_CTX *ctx,
50 /* Length is an unsigned char according to rsaref.txt,
51 * but that must be a typo. */
54 md5_update(&ctx->hash, length, data);
60 R_SignFinal(R_SIGNATURE_CTX *ctx,
63 R_RSA_PRIVATE_KEY *key)
65 struct rsa_private_key k;
68 nettle_mpz_init_set_str_256_u(k.p,
69 MAX_RSA_MODULUS_LEN, key->prime[0]);
70 nettle_mpz_init_set_str_256_u(k.q,
71 MAX_RSA_MODULUS_LEN, key->prime[1]);
72 nettle_mpz_init_set_str_256_u(k.a,
73 MAX_RSA_MODULUS_LEN, key->primeExponent[0]);
74 nettle_mpz_init_set_str_256_u(k.b,
75 MAX_RSA_MODULUS_LEN, key->primeExponent[1]);
76 nettle_mpz_init_set_str_256_u(k.c,
77 MAX_RSA_MODULUS_LEN, key->coefficient);
79 if (rsa_private_key_prepare(&k) && (k.size <= MAX_RSA_MODULUS_LEN))
84 if (rsa_md5_sign(&k, &ctx->hash, s))
86 nettle_mpz_get_str_256(k.size, signature, s);
109 R_VerifyInit(R_SIGNATURE_CTX *ctx,
112 return R_SignInit(ctx, digestAlgorithm);
116 R_VerifyUpdate(R_SIGNATURE_CTX *ctx,
118 /* Length is an unsigned char according to rsaref.txt,
119 * but that must be a typo. */
122 return R_SignUpdate(ctx, data, length);
126 R_VerifyFinal(R_SIGNATURE_CTX *ctx,
129 R_RSA_PUBLIC_KEY *key)
131 struct rsa_public_key k;
134 nettle_mpz_init_set_str_256_u(k.n,
135 MAX_RSA_MODULUS_LEN, key->modulus);
136 nettle_mpz_init_set_str_256_u(k.e,
137 MAX_RSA_MODULUS_LEN, key->exponent);
139 if (rsa_public_key_prepare(&k) && (k.size == length))
143 nettle_mpz_init_set_str_256_u(s,
145 res = rsa_md5_verify(&k, &ctx->hash, s)
146 ? RE_SUCCESS : RE_SIGNATURE;