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