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Packit |
c4476c |
/*
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c4476c |
* Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
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|
Packit |
c4476c |
*
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Packit |
c4476c |
* Licensed under the OpenSSL license (the "License"). You may not use
|
|
Packit |
c4476c |
* this file except in compliance with the License. You can obtain a copy
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|
Packit |
c4476c |
* in the file LICENSE in the source distribution or at
|
|
Packit |
c4476c |
* https://www.openssl.org/source/license.html
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|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/*
|
|
Packit |
c4476c |
* Parameter generation follows the updated Appendix 2.2 for FIPS PUB 186,
|
|
Packit |
c4476c |
* also Appendix 2.2 of FIPS PUB 186-1 (i.e. use SHA as defined in FIPS PUB
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|
Packit |
c4476c |
* 180-1)
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|
Packit |
c4476c |
*/
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|
Packit |
c4476c |
#define xxxHASH EVP_sha1()
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c4476c |
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c4476c |
#include <openssl/opensslconf.h>
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c4476c |
#include <stdio.h>
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c4476c |
#include "internal/cryptlib.h"
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c4476c |
#include <openssl/evp.h>
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c4476c |
#include <openssl/bn.h>
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c4476c |
#include <openssl/rand.h>
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c4476c |
#include <openssl/sha.h>
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c4476c |
#include "dsa_local.h"
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c4476c |
#ifdef OPENSSL_FIPS
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c4476c |
# include <openssl/fips.h>
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|
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c4476c |
#endif
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c4476c |
|
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c4476c |
int DSA_generate_parameters_ex(DSA *ret, int bits,
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c4476c |
const unsigned char *seed_in, int seed_len,
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|
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c4476c |
int *counter_ret, unsigned long *h_ret,
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|
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c4476c |
BN_GENCB *cb)
|
|
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c4476c |
{
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|
Packit |
c4476c |
# ifdef OPENSSL_FIPS
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|
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c4476c |
if (FIPS_mode() && !(ret->meth->flags & DSA_FLAG_FIPS_METHOD)
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|
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c4476c |
&& !(ret->flags & DSA_FLAG_NON_FIPS_ALLOW)) {
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|
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c4476c |
DSAerr(DSA_F_DSA_GENERATE_PARAMETERS_EX, DSA_R_NON_FIPS_DSA_METHOD);
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|
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c4476c |
return 0;
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|
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c4476c |
}
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|
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c4476c |
# endif
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|
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c4476c |
if (ret->meth->dsa_paramgen)
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|
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c4476c |
return ret->meth->dsa_paramgen(ret, bits, seed_in, seed_len,
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|
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c4476c |
counter_ret, h_ret, cb);
|
|
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c4476c |
else {
|
|
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c4476c |
const EVP_MD *evpmd = bits >= 2048 ? EVP_sha256() : EVP_sha1();
|
|
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c4476c |
size_t qbits = EVP_MD_size(evpmd) * 8;
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|
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c4476c |
|
|
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c4476c |
# ifdef OPENSSL_FIPS
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|
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c4476c |
return dsa_builtin_paramgen2(ret, bits, qbits, evpmd,
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|
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c4476c |
seed_in, seed_len, -1, NULL, counter_ret,
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|
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c4476c |
h_ret, cb);
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|
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c4476c |
# else
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|
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c4476c |
return dsa_builtin_paramgen(ret, bits, qbits, evpmd,
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|
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c4476c |
seed_in, seed_len, NULL, counter_ret,
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|
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c4476c |
h_ret, cb);
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c4476c |
# endif
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c4476c |
}
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c4476c |
}
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c4476c |
|
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c4476c |
int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
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c4476c |
const EVP_MD *evpmd, const unsigned char *seed_in,
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|
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c4476c |
size_t seed_len, unsigned char *seed_out,
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|
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c4476c |
int *counter_ret, unsigned long *h_ret, BN_GENCB *cb)
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c4476c |
{
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c4476c |
int ok = 0;
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c4476c |
unsigned char seed[SHA256_DIGEST_LENGTH];
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c4476c |
unsigned char md[SHA256_DIGEST_LENGTH];
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|
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c4476c |
unsigned char buf[SHA256_DIGEST_LENGTH], buf2[SHA256_DIGEST_LENGTH];
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|
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c4476c |
BIGNUM *r0, *W, *X, *c, *test;
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c4476c |
BIGNUM *g = NULL, *q = NULL, *p = NULL;
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|
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c4476c |
BN_MONT_CTX *mont = NULL;
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|
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c4476c |
int i, k, n = 0, m = 0, qsize = qbits >> 3;
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|
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c4476c |
int counter = 0;
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|
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c4476c |
int r = 0;
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|
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c4476c |
BN_CTX *ctx = NULL;
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|
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c4476c |
unsigned int h = 2;
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|
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c4476c |
|
|
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c4476c |
if (qsize != SHA_DIGEST_LENGTH && qsize != SHA224_DIGEST_LENGTH &&
|
|
Packit |
c4476c |
qsize != SHA256_DIGEST_LENGTH)
|
|
Packit |
c4476c |
/* invalid q size */
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|
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c4476c |
return 0;
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|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (evpmd == NULL) {
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|
Packit |
c4476c |
if (qsize == SHA_DIGEST_LENGTH)
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|
Packit |
c4476c |
evpmd = EVP_sha1();
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|
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c4476c |
else if (qsize == SHA224_DIGEST_LENGTH)
|
|
Packit |
c4476c |
evpmd = EVP_sha224();
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|
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c4476c |
else
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|
Packit |
c4476c |
evpmd = EVP_sha256();
|
|
Packit |
c4476c |
} else {
|
|
Packit |
c4476c |
qsize = EVP_MD_size(evpmd);
|
|
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c4476c |
}
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|
Packit |
c4476c |
|
|
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c4476c |
if (bits < 512)
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|
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c4476c |
bits = 512;
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|
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c4476c |
|
|
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c4476c |
bits = (bits + 63) / 64 * 64;
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|
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c4476c |
|
|
Packit |
c4476c |
if (seed_in != NULL) {
|
|
Packit |
c4476c |
if (seed_len < (size_t)qsize) {
|
|
Packit |
c4476c |
DSAerr(DSA_F_DSA_BUILTIN_PARAMGEN, DSA_R_SEED_LEN_SMALL);
|
|
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c4476c |
return 0;
|
|
Packit |
c4476c |
}
|
|
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c4476c |
if (seed_len > (size_t)qsize) {
|
|
Packit |
c4476c |
/* Only consume as much seed as is expected. */
|
|
Packit |
c4476c |
seed_len = qsize;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
memcpy(seed, seed_in, seed_len);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if ((mont = BN_MONT_CTX_new()) == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if ((ctx = BN_CTX_new()) == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
BN_CTX_start(ctx);
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
r0 = BN_CTX_get(ctx);
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|
Packit |
c4476c |
g = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
W = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
q = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
X = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
c = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
p = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
test = BN_CTX_get(ctx);
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|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (test == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!BN_lshift(test, BN_value_one(), bits - 1))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
for (;;) {
|
|
Packit |
c4476c |
for (;;) { /* find q */
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|
Packit |
c4476c |
int use_random_seed = (seed_in == NULL);
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|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 1 */
|
|
Packit |
c4476c |
if (!BN_GENCB_call(cb, 0, m++))
|
|
Packit |
c4476c |
goto err;
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|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (use_random_seed) {
|
|
Packit |
c4476c |
if (RAND_bytes(seed, qsize) <= 0)
|
|
Packit |
c4476c |
goto err;
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|
Packit |
c4476c |
} else {
|
|
Packit |
c4476c |
/* If we come back through, use random seed next time. */
|
|
Packit |
c4476c |
seed_in = NULL;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
memcpy(buf, seed, qsize);
|
|
Packit |
c4476c |
memcpy(buf2, seed, qsize);
|
|
Packit |
c4476c |
/* precompute "SEED + 1" for step 7: */
|
|
Packit |
c4476c |
for (i = qsize - 1; i >= 0; i--) {
|
|
Packit |
c4476c |
buf[i]++;
|
|
Packit |
c4476c |
if (buf[i] != 0)
|
|
Packit |
c4476c |
break;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 2 */
|
|
Packit |
c4476c |
if (!EVP_Digest(seed, qsize, md, NULL, evpmd, NULL))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!EVP_Digest(buf, qsize, buf2, NULL, evpmd, NULL))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
for (i = 0; i < qsize; i++)
|
|
Packit |
c4476c |
md[i] ^= buf2[i];
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 3 */
|
|
Packit |
c4476c |
md[0] |= 0x80;
|
|
Packit |
c4476c |
md[qsize - 1] |= 0x01;
|
|
Packit |
c4476c |
if (!BN_bin2bn(md, qsize, q))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 4 */
|
|
Packit |
c4476c |
r = BN_is_prime_fasttest_ex(q, DSS_prime_checks, ctx,
|
|
Packit |
c4476c |
use_random_seed, cb);
|
|
Packit |
c4476c |
if (r > 0)
|
|
Packit |
c4476c |
break;
|
|
Packit |
c4476c |
if (r != 0)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* do a callback call */
|
|
Packit |
c4476c |
/* step 5 */
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!BN_GENCB_call(cb, 2, 0))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_GENCB_call(cb, 3, 0))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 6 */
|
|
Packit |
c4476c |
counter = 0;
|
|
Packit |
c4476c |
/* "offset = 2" */
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
n = (bits - 1) / 160;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
for (;;) {
|
|
Packit |
c4476c |
if ((counter != 0) && !BN_GENCB_call(cb, 0, counter))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 7 */
|
|
Packit |
c4476c |
BN_zero(W);
|
|
Packit |
c4476c |
/* now 'buf' contains "SEED + offset - 1" */
|
|
Packit |
c4476c |
for (k = 0; k <= n; k++) {
|
|
Packit |
c4476c |
/*
|
|
Packit |
c4476c |
* obtain "SEED + offset + k" by incrementing:
|
|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
for (i = qsize - 1; i >= 0; i--) {
|
|
Packit |
c4476c |
buf[i]++;
|
|
Packit |
c4476c |
if (buf[i] != 0)
|
|
Packit |
c4476c |
break;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!EVP_Digest(buf, qsize, md, NULL, evpmd, NULL))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 8 */
|
|
Packit |
c4476c |
if (!BN_bin2bn(md, qsize, r0))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_lshift(r0, r0, (qsize << 3) * k))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_add(W, W, r0))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* more of step 8 */
|
|
Packit |
c4476c |
if (!BN_mask_bits(W, bits - 1))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_copy(X, W))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_add(X, X, test))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 9 */
|
|
Packit |
c4476c |
if (!BN_lshift1(r0, q))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_mod(c, X, r0, ctx))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_sub(r0, c, BN_value_one()))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_sub(p, X, r0))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 10 */
|
|
Packit |
c4476c |
if (BN_cmp(p, test) >= 0) {
|
|
Packit |
c4476c |
/* step 11 */
|
|
Packit |
c4476c |
r = BN_is_prime_fasttest_ex(p, DSS_prime_checks, ctx, 1, cb);
|
|
Packit |
c4476c |
if (r > 0)
|
|
Packit |
c4476c |
goto end; /* found it */
|
|
Packit |
c4476c |
if (r != 0)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 13 */
|
|
Packit |
c4476c |
counter++;
|
|
Packit |
c4476c |
/* "offset = offset + n + 1" */
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 14 */
|
|
Packit |
c4476c |
if (counter >= 4096)
|
|
Packit |
c4476c |
break;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
end:
|
|
Packit |
c4476c |
if (!BN_GENCB_call(cb, 2, 1))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* We now need to generate g */
|
|
Packit |
c4476c |
/* Set r0=(p-1)/q */
|
|
Packit |
c4476c |
if (!BN_sub(test, p, BN_value_one()))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_div(r0, NULL, test, q, ctx))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!BN_set_word(test, h))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_MONT_CTX_set(mont, p, ctx))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
for (;;) {
|
|
Packit |
c4476c |
/* g=test^r0%p */
|
|
Packit |
c4476c |
if (!BN_mod_exp_mont(g, test, r0, p, ctx, mont))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_is_one(g))
|
|
Packit |
c4476c |
break;
|
|
Packit |
c4476c |
if (!BN_add(test, test, BN_value_one()))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
h++;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!BN_GENCB_call(cb, 3, 1))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
ok = 1;
|
|
Packit |
c4476c |
err:
|
|
Packit |
c4476c |
if (ok) {
|
|
Packit |
c4476c |
BN_free(ret->p);
|
|
Packit |
c4476c |
BN_free(ret->q);
|
|
Packit |
c4476c |
BN_free(ret->g);
|
|
Packit |
c4476c |
ret->p = BN_dup(p);
|
|
Packit |
c4476c |
ret->q = BN_dup(q);
|
|
Packit |
c4476c |
ret->g = BN_dup(g);
|
|
Packit |
c4476c |
if (ret->p == NULL || ret->q == NULL || ret->g == NULL) {
|
|
Packit |
c4476c |
ok = 0;
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
if (counter_ret != NULL)
|
|
Packit |
c4476c |
*counter_ret = counter;
|
|
Packit |
c4476c |
if (h_ret != NULL)
|
|
Packit |
c4476c |
*h_ret = h;
|
|
Packit |
c4476c |
if (seed_out)
|
|
Packit |
c4476c |
memcpy(seed_out, seed, qsize);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
BN_CTX_end(ctx);
|
|
Packit |
c4476c |
BN_CTX_free(ctx);
|
|
Packit |
c4476c |
BN_MONT_CTX_free(mont);
|
|
Packit |
c4476c |
return ok;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/*
|
|
Packit |
c4476c |
* This is a parameter generation algorithm for the DSA2 algorithm as
|
|
Packit |
c4476c |
* described in FIPS 186-3.
|
|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
|
|
Packit |
c4476c |
const EVP_MD *evpmd, const unsigned char *seed_in,
|
|
Packit |
c4476c |
size_t seed_len, int idx, unsigned char *seed_out,
|
|
Packit |
c4476c |
int *counter_ret, unsigned long *h_ret,
|
|
Packit |
c4476c |
BN_GENCB *cb)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
int ok = 0;
|
|
Packit |
c4476c |
unsigned char *seed = NULL, *seed_tmp = NULL;
|
|
Packit |
c4476c |
unsigned char md[EVP_MAX_MD_SIZE];
|
|
Packit |
c4476c |
int mdsize;
|
|
Packit |
c4476c |
BIGNUM *r0, *W, *X, *c, *test;
|
|
Packit |
c4476c |
BIGNUM *g = NULL, *q = NULL, *p = NULL;
|
|
Packit |
c4476c |
BN_MONT_CTX *mont = NULL;
|
|
Packit |
c4476c |
int i, k, n = 0, m = 0, qsize = N >> 3;
|
|
Packit |
c4476c |
int counter = 0;
|
|
Packit |
c4476c |
int r = 0;
|
|
Packit |
c4476c |
BN_CTX *ctx = NULL;
|
|
Packit |
c4476c |
EVP_MD_CTX *mctx = EVP_MD_CTX_new();
|
|
Packit |
c4476c |
unsigned int h = 2;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (mctx == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* make sure L > N, otherwise we'll get trapped in an infinite loop */
|
|
Packit |
c4476c |
if (L <= N) {
|
|
Packit |
c4476c |
DSAerr(DSA_F_DSA_BUILTIN_PARAMGEN2, DSA_R_INVALID_PARAMETERS);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
# ifdef OPENSSL_FIPS
|
|
Packit |
c4476c |
if (FIPS_selftest_failed()) {
|
|
Packit |
c4476c |
FIPSerr(FIPS_F_DSA_BUILTIN_PARAMGEN2, FIPS_R_FIPS_SELFTEST_FAILED);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (FIPS_mode() &&
|
|
Packit |
c4476c |
(L != 2048 || N != 224) && (L != 2048 || N != 256) &&
|
|
Packit |
c4476c |
(L != 3072 || N != 256)) {
|
|
Packit |
c4476c |
DSAerr(DSA_F_DSA_BUILTIN_PARAMGEN2, DSA_R_KEY_SIZE_INVALID);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
# endif
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (evpmd == NULL) {
|
|
Packit |
c4476c |
if (N == 160)
|
|
Packit |
c4476c |
evpmd = EVP_sha1();
|
|
Packit |
c4476c |
else if (N == 224)
|
|
Packit |
c4476c |
evpmd = EVP_sha224();
|
|
Packit |
c4476c |
else
|
|
Packit |
c4476c |
evpmd = EVP_sha256();
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
mdsize = EVP_MD_size(evpmd);
|
|
Packit |
c4476c |
/* If unverifiable g generation only don't need seed */
|
|
Packit |
c4476c |
if (!ret->p || !ret->q || idx >= 0) {
|
|
Packit |
c4476c |
if (seed_len == 0)
|
|
Packit |
c4476c |
seed_len = mdsize;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
seed = OPENSSL_malloc(seed_len);
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (seed_out)
|
|
Packit |
c4476c |
seed_tmp = seed_out;
|
|
Packit |
c4476c |
else
|
|
Packit |
c4476c |
seed_tmp = OPENSSL_malloc(seed_len);
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (seed == NULL || seed_tmp == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (seed_in)
|
|
Packit |
c4476c |
memcpy(seed, seed_in, seed_len);
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if ((ctx = BN_CTX_new()) == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if ((mont = BN_MONT_CTX_new()) == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
BN_CTX_start(ctx);
|
|
Packit |
c4476c |
r0 = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
g = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
W = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
X = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
c = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
test = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
if (test == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* if p, q already supplied generate g only */
|
|
Packit |
c4476c |
if (ret->p && ret->q) {
|
|
Packit |
c4476c |
p = ret->p;
|
|
Packit |
c4476c |
q = ret->q;
|
|
Packit |
c4476c |
if (idx >= 0)
|
|
Packit |
c4476c |
memcpy(seed_tmp, seed, seed_len);
|
|
Packit |
c4476c |
goto g_only;
|
|
Packit |
c4476c |
} else {
|
|
Packit |
c4476c |
p = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
q = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
if (q == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!BN_lshift(test, BN_value_one(), L - 1))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
for (;;) {
|
|
Packit |
c4476c |
for (;;) { /* find q */
|
|
Packit |
c4476c |
unsigned char *pmd;
|
|
Packit |
c4476c |
/* step 1 */
|
|
Packit |
c4476c |
if (!BN_GENCB_call(cb, 0, m++))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!seed_in) {
|
|
Packit |
c4476c |
if (RAND_bytes(seed, seed_len) <= 0)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
/* step 2 */
|
|
Packit |
c4476c |
if (!EVP_Digest(seed, seed_len, md, NULL, evpmd, NULL))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
/* Take least significant bits of md */
|
|
Packit |
c4476c |
if (mdsize > qsize)
|
|
Packit |
c4476c |
pmd = md + mdsize - qsize;
|
|
Packit |
c4476c |
else
|
|
Packit |
c4476c |
pmd = md;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (mdsize < qsize)
|
|
Packit |
c4476c |
memset(md + mdsize, 0, qsize - mdsize);
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 3 */
|
|
Packit |
c4476c |
pmd[0] |= 0x80;
|
|
Packit |
c4476c |
pmd[qsize - 1] |= 0x01;
|
|
Packit |
c4476c |
if (!BN_bin2bn(pmd, qsize, q))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 4 */
|
|
Packit |
c4476c |
r = BN_is_prime_fasttest_ex(q, DSS_prime_checks, ctx,
|
|
Packit |
c4476c |
seed_in ? 1 : 0, cb);
|
|
Packit |
c4476c |
if (r > 0)
|
|
Packit |
c4476c |
break;
|
|
Packit |
c4476c |
if (r != 0)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
/* Provided seed didn't produce a prime: error */
|
|
Packit |
c4476c |
if (seed_in) {
|
|
Packit |
c4476c |
/* Different seed_out will indicate that seed_in
|
|
Packit |
c4476c |
* did not generate primes.
|
|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
seed_in = NULL;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* do a callback call */
|
|
Packit |
c4476c |
/* step 5 */
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
/* Copy seed to seed_out before we mess with it */
|
|
Packit |
c4476c |
if (seed_out)
|
|
Packit |
c4476c |
memcpy(seed_out, seed, seed_len);
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!BN_GENCB_call(cb, 2, 0))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_GENCB_call(cb, 3, 0))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 6 */
|
|
Packit |
c4476c |
counter = 0;
|
|
Packit |
c4476c |
/* "offset = 1" */
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
n = (L - 1) / (mdsize << 3);
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
for (;;) {
|
|
Packit |
c4476c |
if ((counter != 0) && !BN_GENCB_call(cb, 0, counter))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 7 */
|
|
Packit |
c4476c |
BN_zero(W);
|
|
Packit |
c4476c |
/* now 'buf' contains "SEED + offset - 1" */
|
|
Packit |
c4476c |
for (k = 0; k <= n; k++) {
|
|
Packit |
c4476c |
/*
|
|
Packit |
c4476c |
* obtain "SEED + offset + k" by incrementing:
|
|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
for (i = seed_len - 1; i >= 0; i--) {
|
|
Packit |
c4476c |
seed[i]++;
|
|
Packit |
c4476c |
if (seed[i] != 0)
|
|
Packit |
c4476c |
break;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!EVP_Digest(seed, seed_len, md, NULL, evpmd, NULL))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 8 */
|
|
Packit |
c4476c |
if (!BN_bin2bn(md, mdsize, r0))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_lshift(r0, r0, (mdsize << 3) * k))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_add(W, W, r0))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* more of step 8 */
|
|
Packit |
c4476c |
if (!BN_mask_bits(W, L - 1))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_copy(X, W))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_add(X, X, test))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 9 */
|
|
Packit |
c4476c |
if (!BN_lshift1(r0, q))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_mod(c, X, r0, ctx))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_sub(r0, c, BN_value_one()))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_sub(p, X, r0))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 10 */
|
|
Packit |
c4476c |
if (BN_cmp(p, test) >= 0) {
|
|
Packit |
c4476c |
/* step 11 */
|
|
Packit |
c4476c |
r = BN_is_prime_fasttest_ex(p, DSS_prime_checks, ctx, 1, cb);
|
|
Packit |
c4476c |
if (r > 0)
|
|
Packit |
c4476c |
goto end; /* found it */
|
|
Packit |
c4476c |
if (r != 0)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 13 */
|
|
Packit |
c4476c |
counter++;
|
|
Packit |
c4476c |
/* "offset = offset + n + 1" */
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* step 14 */
|
|
Packit |
c4476c |
if (counter >= (int)(4 * L))
|
|
Packit |
c4476c |
break;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
#if 0
|
|
Packit |
c4476c |
/* Cannot happen */
|
|
Packit |
c4476c |
if (seed_in) {
|
|
Packit |
c4476c |
ok = 0;
|
|
Packit |
c4476c |
DSAerr(DSA_F_DSA_BUILTIN_PARAMGEN2, DSA_R_INVALID_PARAMETERS);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
#endif
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
end:
|
|
Packit |
c4476c |
if (!BN_GENCB_call(cb, 2, 1))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
g_only:
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* We now need to generate g */
|
|
Packit |
c4476c |
/* Set r0=(p-1)/q */
|
|
Packit |
c4476c |
if (!BN_sub(test, p, BN_value_one()))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_div(r0, NULL, test, q, ctx))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (idx < 0) {
|
|
Packit |
c4476c |
if (!BN_set_word(test, h))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
} else
|
|
Packit |
c4476c |
h = 1;
|
|
Packit |
c4476c |
if (!BN_MONT_CTX_set(mont, p, ctx))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
for (;;) {
|
|
Packit |
c4476c |
static const unsigned char ggen[4] = { 0x67, 0x67, 0x65, 0x6e };
|
|
Packit |
c4476c |
if (idx >= 0) {
|
|
Packit |
c4476c |
md[0] = idx & 0xff;
|
|
Packit |
c4476c |
md[1] = (h >> 8) & 0xff;
|
|
Packit |
c4476c |
md[2] = h & 0xff;
|
|
Packit |
c4476c |
if (!EVP_DigestInit_ex(mctx, evpmd, NULL))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!EVP_DigestUpdate(mctx, seed_tmp, seed_len))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!EVP_DigestUpdate(mctx, ggen, sizeof(ggen)))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!EVP_DigestUpdate(mctx, md, 3))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!EVP_DigestFinal_ex(mctx, md, NULL))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_bin2bn(md, mdsize, test))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
/* g=test^r0%p */
|
|
Packit |
c4476c |
if (!BN_mod_exp_mont(g, test, r0, p, ctx, mont))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_is_one(g))
|
|
Packit |
c4476c |
break;
|
|
Packit |
c4476c |
if (idx < 0 && !BN_add(test, test, BN_value_one()))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
h++;
|
|
Packit |
c4476c |
if (idx >= 0 && h > 0xffff)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!BN_GENCB_call(cb, 3, 1))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
ok = 1;
|
|
Packit |
c4476c |
err:
|
|
Packit |
c4476c |
if (ok == 1) {
|
|
Packit |
c4476c |
if (p != ret->p) {
|
|
Packit |
c4476c |
BN_free(ret->p);
|
|
Packit |
c4476c |
ret->p = BN_dup(p);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
if (q != ret->q) {
|
|
Packit |
c4476c |
BN_free(ret->q);
|
|
Packit |
c4476c |
ret->q = BN_dup(q);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
BN_free(ret->g);
|
|
Packit |
c4476c |
ret->g = BN_dup(g);
|
|
Packit |
c4476c |
if (ret->p == NULL || ret->q == NULL || ret->g == NULL) {
|
|
Packit |
c4476c |
ok = 0;
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
if (counter_ret != NULL)
|
|
Packit |
c4476c |
*counter_ret = counter;
|
|
Packit |
c4476c |
if (h_ret != NULL)
|
|
Packit |
c4476c |
*h_ret = h;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
OPENSSL_free(seed);
|
|
Packit |
c4476c |
if (seed_out != seed_tmp)
|
|
Packit |
c4476c |
OPENSSL_free(seed_tmp);
|
|
Packit |
c4476c |
BN_CTX_end(ctx);
|
|
Packit |
c4476c |
BN_CTX_free(ctx);
|
|
Packit |
c4476c |
BN_MONT_CTX_free(mont);
|
|
Packit |
c4476c |
EVP_MD_CTX_free(mctx);
|
|
Packit |
c4476c |
return ok;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
#ifdef OPENSSL_FIPS
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
int FIPS_dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
|
|
Packit |
c4476c |
const EVP_MD *evpmd, const unsigned char *seed_in,
|
|
Packit |
c4476c |
size_t seed_len, int idx, unsigned char *seed_out,
|
|
Packit |
c4476c |
int *counter_ret, unsigned long *h_ret,
|
|
Packit |
c4476c |
BN_GENCB *cb)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
return dsa_builtin_paramgen2(ret, L, N, evpmd, seed_in, seed_len,
|
|
Packit |
c4476c |
idx, seed_out, counter_ret, h_ret, cb);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
int FIPS_dsa_paramgen_check_g(DSA *dsa)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
BN_CTX *ctx;
|
|
Packit |
c4476c |
BIGNUM *tmp;
|
|
Packit |
c4476c |
BN_MONT_CTX *mont = NULL;
|
|
Packit |
c4476c |
int rv = -1;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
ctx = BN_CTX_new();
|
|
Packit |
c4476c |
if (ctx == NULL)
|
|
Packit |
c4476c |
return -1;
|
|
Packit |
c4476c |
if (BN_cmp(dsa->g, BN_value_one()) <= 0)
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
if (BN_cmp(dsa->g, dsa->p) >= 0)
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
BN_CTX_start(ctx);
|
|
Packit |
c4476c |
tmp = BN_CTX_get(ctx);
|
|
Packit |
c4476c |
if (tmp == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if ((mont=BN_MONT_CTX_new()) == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_MONT_CTX_set(mont,dsa->p,ctx))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
/* Work out g^q mod p */
|
|
Packit |
c4476c |
if (!BN_mod_exp_mont(tmp,dsa->g,dsa->q, dsa->p, ctx, mont))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
if (!BN_cmp(tmp, BN_value_one()))
|
|
Packit |
c4476c |
rv = 1;
|
|
Packit |
c4476c |
else
|
|
Packit |
c4476c |
rv = 0;
|
|
Packit |
c4476c |
err:
|
|
Packit |
c4476c |
BN_CTX_end(ctx);
|
|
Packit |
c4476c |
BN_MONT_CTX_free(mont);
|
|
Packit |
c4476c |
BN_CTX_free(ctx);
|
|
Packit |
c4476c |
return rv;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
#endif
|