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Diffstat (limited to 'fips/dsa/fips_dsa_gen.c')
-rw-r--r-- | fips/dsa/fips_dsa_gen.c | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/fips/dsa/fips_dsa_gen.c b/fips/dsa/fips_dsa_gen.c new file mode 100644 index 0000000000..69501803a9 --- /dev/null +++ b/fips/dsa/fips_dsa_gen.c @@ -0,0 +1,298 @@ +/* crypto/dsa/dsa_gen.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ + +#undef GENUINE_DSA + +#ifdef GENUINE_DSA +/* Parameter generation follows the original release of FIPS PUB 186, + * Appendix 2.2 (i.e. use SHA as defined in FIPS PUB 180) */ +#define HASH EVP_sha() +#else +/* Parameter generation follows the updated Appendix 2.2 for FIPS PUB 186, + * also Appendix 2.2 of FIPS PUB 186-1 (i.e. use SHA as defined in + * FIPS PUB 180-1) */ +#define HASH EVP_sha1() +#endif + +#ifndef OPENSSL_NO_SHA + +#include <stdio.h> +#include <time.h> +//#include "cryptlib.h" +#include <openssl/evp.h> +#include <openssl/bn.h> +#include <openssl/dsa.h> +#include <openssl/rand.h> +#include <openssl/sha.h> + +DSA *DSA_generate_parameters(int bits, + unsigned char *seed_in, int seed_len, + int *counter_ret, unsigned long *h_ret, + void (*callback)(int, int, void *), + void *cb_arg) + { + int ok=0; + unsigned char seed[SHA_DIGEST_LENGTH]; + unsigned char md[SHA_DIGEST_LENGTH]; + unsigned char buf[SHA_DIGEST_LENGTH],buf2[SHA_DIGEST_LENGTH]; + BIGNUM *r0,*W,*X,*c,*test; + BIGNUM *g=NULL,*q=NULL,*p=NULL; + BN_MONT_CTX *mont=NULL; + int k,n=0,i,b,m=0; + int counter=0; + int r=0; + BN_CTX *ctx=NULL,*ctx2=NULL,*ctx3=NULL; + unsigned int h=2; + DSA *ret=NULL; + unsigned char *seed_out=seed_in; + + if (bits < 512) bits=512; + bits=(bits+63)/64*64; + + if (seed_len < 20) + seed_in = NULL; /* seed buffer too small -- ignore */ + if (seed_len > 20) + seed_len = 20; /* App. 2.2 of FIPS PUB 186 allows larger SEED, + * but our internal buffers are restricted to 160 bits*/ + if ((seed_in != NULL) && (seed_len == 20)) + memcpy(seed,seed_in,seed_len); + + if ((ctx=BN_CTX_new()) == NULL) goto err; + if ((ctx2=BN_CTX_new()) == NULL) goto err; + if ((ctx3=BN_CTX_new()) == NULL) goto err; + if ((ret=DSA_new()) == NULL) goto err; + + if ((mont=BN_MONT_CTX_new()) == NULL) goto err; + + BN_CTX_start(ctx2); + r0 = BN_CTX_get(ctx2); + g = BN_CTX_get(ctx2); + W = BN_CTX_get(ctx2); + q = BN_CTX_get(ctx2); + X = BN_CTX_get(ctx2); + c = BN_CTX_get(ctx2); + p = BN_CTX_get(ctx2); + test = BN_CTX_get(ctx2); + + BN_lshift(test,BN_value_one(),bits-1); + + for (;;) + { + for (;;) /* find q */ + { + int seed_is_random; + + /* step 1 */ + if (callback != NULL) callback(0,m++,cb_arg); + + if (!seed_len) + { + if(RAND_pseudo_bytes(seed,SHA_DIGEST_LENGTH) < 0) + goto err; + seed_is_random = 1; + } + else + { + seed_is_random = 0; + seed_len=0; /* use random seed if 'seed_in' turns out to be bad*/ + } + memcpy(buf,seed,SHA_DIGEST_LENGTH); + memcpy(buf2,seed,SHA_DIGEST_LENGTH); + /* precompute "SEED + 1" for step 7: */ + for (i=SHA_DIGEST_LENGTH-1; i >= 0; i--) + { + buf[i]++; + if (buf[i] != 0) break; + } + + /* step 2 */ + EVP_Digest(seed,SHA_DIGEST_LENGTH,md,NULL,HASH, NULL); + EVP_Digest(buf,SHA_DIGEST_LENGTH,buf2,NULL,HASH, NULL); + for (i=0; i<SHA_DIGEST_LENGTH; i++) + md[i]^=buf2[i]; + + /* step 3 */ + md[0]|=0x80; + md[SHA_DIGEST_LENGTH-1]|=0x01; + if (!BN_bin2bn(md,SHA_DIGEST_LENGTH,q)) goto err; + + /* step 4 */ + r = BN_is_prime_fasttest(q, DSS_prime_checks, callback, ctx3, cb_arg, seed_is_random); + if (r > 0) + break; + if (r != 0) + goto err; + + /* do a callback call */ + /* step 5 */ + } + + if (callback != NULL) callback(2,0,cb_arg); + if (callback != NULL) callback(3,0,cb_arg); + + /* step 6 */ + counter=0; + /* "offset = 2" */ + + n=(bits-1)/160; + b=(bits-1)-n*160; + + for (;;) + { + if (callback != NULL && counter != 0) + callback(0,counter,cb_arg); + + /* step 7 */ + BN_zero(W); + /* now 'buf' contains "SEED + offset - 1" */ + for (k=0; k<=n; k++) + { + /* obtain "SEED + offset + k" by incrementing: */ + for (i=SHA_DIGEST_LENGTH-1; i >= 0; i--) + { + buf[i]++; + if (buf[i] != 0) break; + } + + EVP_Digest(buf,SHA_DIGEST_LENGTH,md,NULL,HASH, NULL); + + /* step 8 */ + if (!BN_bin2bn(md,SHA_DIGEST_LENGTH,r0)) + goto err; + BN_lshift(r0,r0,160*k); + BN_add(W,W,r0); + } + + /* more of step 8 */ + BN_mask_bits(W,bits-1); + BN_copy(X,W); /* this should be ok */ + BN_add(X,X,test); /* this should be ok */ + + /* step 9 */ + BN_lshift1(r0,q); + BN_mod(c,X,r0,ctx); + BN_sub(r0,c,BN_value_one()); + BN_sub(p,X,r0); + + /* step 10 */ + if (BN_cmp(p,test) >= 0) + { + /* step 11 */ + r = BN_is_prime_fasttest(p, DSS_prime_checks, callback, ctx3, cb_arg, 1); + if (r > 0) + goto end; /* found it */ + if (r != 0) + goto err; + } + + /* step 13 */ + counter++; + /* "offset = offset + n + 1" */ + + /* step 14 */ + if (counter >= 4096) break; + } + } +end: + if (callback != NULL) callback(2,1,cb_arg); + + /* We now need to generate g */ + /* Set r0=(p-1)/q */ + BN_sub(test,p,BN_value_one()); + BN_div(r0,NULL,test,q,ctx); + + BN_set_word(test,h); + BN_MONT_CTX_set(mont,p,ctx); + + for (;;) + { + /* g=test^r0%p */ + BN_mod_exp_mont(g,test,r0,p,ctx,mont); + if (!BN_is_one(g)) break; + BN_add(test,test,BN_value_one()); + h++; + } + + if (callback != NULL) callback(3,1,cb_arg); + + ok=1; +err: + if (!ok) + { + if (ret != NULL) DSA_free(ret); + } + else + { + ret->p=BN_dup(p); + ret->q=BN_dup(q); + ret->g=BN_dup(g); + if(seed_out != NULL) memcpy(seed_out,seed,20); + if (counter_ret != NULL) *counter_ret=counter; + if (h_ret != NULL) *h_ret=h; + } + if (ctx != NULL) BN_CTX_free(ctx); + if (ctx2 != NULL) + { + BN_CTX_end(ctx2); + BN_CTX_free(ctx2); + } + if (ctx3 != NULL) BN_CTX_free(ctx3); + if (mont != NULL) BN_MONT_CTX_free(mont); + return(ok?ret:NULL); + } +#endif |