From 15b5d84f9da2ce4bfae8580e56e34a859f74ad71 Mon Sep 17 00:00:00 2001 From: markus <> Date: Thu, 5 Sep 2002 12:51:50 +0000 Subject: import openssl-0.9.7-beta1 --- src/lib/libcrypto/dsa/dsa_gen.c | 220 +++++++++++++++++----------------------- 1 file changed, 94 insertions(+), 126 deletions(-) (limited to 'src/lib/libcrypto/dsa/dsa_gen.c') diff --git a/src/lib/libcrypto/dsa/dsa_gen.c b/src/lib/libcrypto/dsa/dsa_gen.c index d7d30bf90a..dc9c249310 100644 --- a/src/lib/libcrypto/dsa/dsa_gen.c +++ b/src/lib/libcrypto/dsa/dsa_gen.c @@ -59,28 +59,32 @@ #undef GENUINE_DSA #ifdef GENUINE_DSA -#define HASH SHA +/* 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 -#define HASH SHA1 +/* 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 #include #include "cryptlib.h" -#include "sha.h" -#include "bn.h" -#include "dsa.h" -#include "rand.h" - -DSA *DSA_generate_parameters(bits,seed_in,seed_len,counter_ret,h_ret,callback, - cb_arg) -int bits; -unsigned char *seed_in; -int seed_len; -int *counter_ret; -unsigned long *h_ret; -void (*callback)(); -char *cb_arg; +#include +#include +#include +#include +#include + +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]; @@ -88,49 +92,66 @@ char *cb_arg; 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; - BN_CTX *ctx=NULL,*ctx2=NULL; + int r=0; + BN_CTX *ctx=NULL,*ctx2=NULL,*ctx3=NULL; unsigned int h=2; DSA *ret=NULL; 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); - ctx=BN_CTX_new(); - if (ctx == NULL) goto err; - ctx2=BN_CTX_new(); - if (ctx2 == NULL) goto err; - ret=DSA_new(); - if (ret == NULL) goto err; - r0=ctx2->bn[0]; - g=ctx2->bn[1]; - W=ctx2->bn[2]; - q=ctx2->bn[3]; - X=ctx2->bn[4]; - c=ctx2->bn[5]; - p=ctx2->bn[6]; - test=ctx2->bn[7]; + 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 (;;) + for (;;) /* find q */ { + int seed_is_random; + /* step 1 */ if (callback != NULL) callback(0,m++,cb_arg); if (!seed_len) - RAND_bytes(seed,SHA_DIGEST_LENGTH); + { + RAND_pseudo_bytes(seed,SHA_DIGEST_LENGTH); + seed_is_random = 1; + } else - seed_len=0; - + { + 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]++; @@ -138,18 +159,23 @@ char *cb_arg; } /* step 2 */ - HASH(seed,SHA_DIGEST_LENGTH,md); - HASH(buf,SHA_DIGEST_LENGTH,buf2); + EVP_Digest(seed,SHA_DIGEST_LENGTH,md,NULL,HASH, NULL); + EVP_Digest(buf,SHA_DIGEST_LENGTH,buf2,NULL,HASH, NULL); for (i=0; i 0) break; + 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 */ } @@ -159,26 +185,33 @@ char *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; } - HASH(buf,SHA_DIGEST_LENGTH,md); + EVP_Digest(buf,SHA_DIGEST_LENGTH,md,NULL,HASH, NULL); /* step 8 */ - if (!BN_bin2bn(md,SHA_DIGEST_LENGTH,r0)) abort(); + if (!BN_bin2bn(md,SHA_DIGEST_LENGTH,r0)) + goto err; BN_lshift(r0,r0,160*k); BN_add(W,W,r0); } @@ -198,32 +231,36 @@ char *cb_arg; if (BN_cmp(p,test) >= 0) { /* step 11 */ - if (DSA_is_prime(p,callback,cb_arg) > 0) - goto end; + 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; - - if (callback != NULL) callback(0,counter,cb_arg); } } end: if (callback != NULL) callback(2,1,cb_arg); - /* We now need to gernerate g */ + /* 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_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(g,test,r0,p,ctx); + BN_mod_exp_mont(g,test,r0,p,ctx,mont); if (!BN_is_one(g)) break; BN_add(test,test,BN_value_one()); h++; @@ -246,83 +283,14 @@ err: if (counter_ret != NULL) *counter_ret=counter; if (h_ret != NULL) *h_ret=h; } - BN_CTX_free(ctx); - BN_CTX_free(ctx2); - return(ok?ret:NULL); - } - -int DSA_is_prime(w, callback,cb_arg) -BIGNUM *w; -void (*callback)(); -char *cb_arg; - { - int ok= -1,j,i,n; - BN_CTX *ctx=NULL,*ctx2=NULL; - BIGNUM *w_1,*b,*m,*z; - int a; - - if (!BN_is_bit_set(w,0)) return(0); - - ctx=BN_CTX_new(); - if (ctx == NULL) goto err; - ctx2=BN_CTX_new(); - if (ctx2 == NULL) goto err; - - m= ctx2->bn[2]; - b= ctx2->bn[3]; - z= ctx2->bn[4]; - w_1=ctx2->bn[5]; - - /* step 1 */ - n=50; - - /* step 2 */ - if (!BN_sub(w_1,w,BN_value_one())) goto err; - for (a=1; !BN_is_bit_set(w_1,a); a++) - ; - if (!BN_rshift(m,w_1,a)) goto err; - - for (i=1; i < n; i++) + if (ctx != NULL) BN_CTX_free(ctx); + if (ctx2 != NULL) { - /* step 3 */ - BN_rand(b,BN_num_bits(w)-2/*-1*/,0,0); - BN_set_word(b,0x10001L); - - /* step 4 */ - j=0; - if (!BN_mod_exp(z,b,m,w,ctx)) goto err; - - /* step 5 */ - for (;;) - { - if (((j == 0) && BN_is_one(z)) || (BN_cmp(z,w_1) == 0)) - break; - - /* step 6 */ - if ((j > 0) && BN_is_one(z)) - { - ok=0; - goto err; - } - - j++; - if (j >= a) - { - ok=0; - goto err; - } - - if (!BN_mod_mul(z,z,z,w,ctx)) goto err; - if (callback != NULL) callback(1,j,cb_arg); - } + BN_CTX_end(ctx2); + BN_CTX_free(ctx2); } - - ok=1; -err: - if (ok == -1) DSAerr(DSA_F_DSA_IS_PRIME,ERR_R_BN_LIB); - BN_CTX_free(ctx); - BN_CTX_free(ctx2); - - return(ok); + if (ctx3 != NULL) BN_CTX_free(ctx3); + if (mont != NULL) BN_MONT_CTX_free(mont); + return(ok?ret:NULL); } - +#endif -- cgit v1.2.3-55-g6feb