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-rw-r--r--crypto/bn/bn.h6
-rw-r--r--crypto/bn/bn_prime.c38
-rw-r--r--crypto/dsa/dsa.h7
-rw-r--r--crypto/dsa/dsa_err.c1
-rw-r--r--crypto/dsa/dsa_gen.c140
-rw-r--r--crypto/dsa/dsatest.c8
-rw-r--r--crypto/sha/sha.h2
7 files changed, 90 insertions, 112 deletions
diff --git a/crypto/bn/bn.h b/crypto/bn/bn.h
index 93e2f6f2bd..e88291d62c 100644
--- a/crypto/bn/bn.h
+++ b/crypto/bn/bn.h
@@ -292,7 +292,7 @@ typedef struct bn_recp_ctx_st
* of Applied Cryptography [Menezes, van Oorschot, Vanstone; CRC Press 1996];
* original paper: Damgaard, Landrock, Pomerance: Average case error estimates
* for the strong probable prime test. -- Math. Comp. 61 (1993) 177-194) */
-#define BN_prime_checks_size(b) ((b) >= 1300 ? 2 : \
+#define BN_prime_checks_for_size(b) ((b) >= 1300 ? 2 : \
(b) >= 850 ? 3 : \
(b) >= 650 ? 4 : \
(b) >= 550 ? 5 : \
@@ -406,6 +406,10 @@ BIGNUM *BN_generate_prime(BIGNUM *ret,int bits,int safe,BIGNUM *add,
BIGNUM *rem,void (*callback)(int,int,void *),void *cb_arg);
int BN_is_prime(BIGNUM *p,int nchecks,void (*callback)(int,int,void *),
BN_CTX *ctx,void *cb_arg);
+int BN_is_prime_fasttest(BIGNUM *p,int nchecks,
+ void (*callback)(int,int,void *),
+ BN_CTX *ctx,BN_CTX *ctx2,void *cb_arg,
+ int do_trial_division);
void ERR_load_BN_strings(void );
BN_ULONG bn_mul_add_words(BN_ULONG *rp, BN_ULONG *ap, int num, BN_ULONG w);
diff --git a/crypto/bn/bn_prime.c b/crypto/bn/bn_prime.c
index 84f0699b9b..e679c7c822 100644
--- a/crypto/bn/bn_prime.c
+++ b/crypto/bn/bn_prime.c
@@ -84,7 +84,7 @@ BIGNUM *BN_generate_prime(BIGNUM *ret, int bits, int safe, BIGNUM *add,
int found=0;
int i,j,c1=0;
BN_CTX *ctx;
- int checks = BN_prime_checks_size(bits);
+ int checks = BN_prime_checks_for_size(bits);
ctx=BN_CTX_new();
if (ctx == NULL) goto err;
@@ -154,10 +154,12 @@ err:
return(found ? rnd : NULL);
}
-int BN_is_prime(BIGNUM *a, int checks, void (*callback)(int,int,void *),
- BN_CTX *ctx_passed, void *cb_arg)
+int BN_is_prime_fasttest(BIGNUM *a, int checks,
+ void (*callback)(int,int,void *),
+ BN_CTX *ctx_passed, BN_CTX *ctx2_passed, void *cb_arg,
+ int do_trial_division)
{
- int i,j,c2=0,ret= -1;
+ int i,j,ret= -1;
BIGNUM *check;
BN_CTX *ctx=NULL,*ctx2=NULL;
BN_MONT_CTX *mont=NULL;
@@ -165,17 +167,25 @@ int BN_is_prime(BIGNUM *a, int checks, void (*callback)(int,int,void *),
if (checks == BN_prime_checks)
{
int bits = BN_num_bits(a);
- checks = BN_prime_checks_size(bits);
+ checks = BN_prime_checks_for_size(bits);
}
if (!BN_is_odd(a))
return(0);
+ if (do_trial_division)
+ for (i = 1; i < NUMPRIMES; i++)
+ if (BN_mod_word(a, primes[i]) == 0)
+ return 0;
+
if (ctx_passed != NULL)
ctx=ctx_passed;
else
if ((ctx=BN_CTX_new()) == NULL) goto err;
+ if (ctx2_passed != NULL)
+ ctx2=ctx2_passed;
+ else
+ if ((ctx2=BN_CTX_new()) == NULL) goto err;
- if ((ctx2=BN_CTX_new()) == NULL) goto err;
if ((mont=BN_MONT_CTX_new()) == NULL) goto err;
check= &(ctx->bn[ctx->tos++]);
@@ -185,7 +195,9 @@ int BN_is_prime(BIGNUM *a, int checks, void (*callback)(int,int,void *),
for (i=0; i<checks; i++)
{
- if (!BN_pseudo_rand(check,BN_num_bits(a)-1,0,0)) goto err;
+ if (!BN_pseudo_rand(check,BN_num_bits(a),0,0)) goto err;
+ if (BN_cmp(check, a) >= 0)
+ BN_sub(check, check, a);
j=witness(check,a,ctx,ctx2,mont);
if (j == -1) goto err;
if (j)
@@ -193,20 +205,26 @@ int BN_is_prime(BIGNUM *a, int checks, void (*callback)(int,int,void *),
ret=0;
goto err;
}
- if (callback != NULL) callback(1,c2++,cb_arg);
+ if (callback != NULL) callback(1,i,cb_arg);
}
ret=1;
err:
ctx->tos--;
if ((ctx_passed == NULL) && (ctx != NULL))
BN_CTX_free(ctx);
- if (ctx2 != NULL)
+ if ((ctx2_passed == NULL) && (ctx2 != NULL))
BN_CTX_free(ctx2);
if (mont != NULL) BN_MONT_CTX_free(mont);
return(ret);
}
+int BN_is_prime(BIGNUM *a, int checks, void (*callback)(int,int,void *),
+ BN_CTX *ctx_passed, void *cb_arg)
+ {
+ return BN_is_prime_fasttest(a, checks, callback, ctx_passed, NULL, cb_arg, 0);
+ }
+
static int witness(BIGNUM *a, BIGNUM *n, BN_CTX *ctx, BN_CTX *ctx2,
BN_MONT_CTX *mont)
{
@@ -274,7 +292,7 @@ err:
static int probable_prime(BIGNUM *rnd, int bits)
{
int i;
- MS_STATIC BN_ULONG mods[NUMPRIMES];
+ BN_ULONG mods[NUMPRIMES];
BN_ULONG delta,d;
again:
diff --git a/crypto/dsa/dsa.h b/crypto/dsa/dsa.h
index 3da104b6dd..e59c7d293f 100644
--- a/crypto/dsa/dsa.h
+++ b/crypto/dsa/dsa.h
@@ -197,7 +197,11 @@ int DSAparams_print_fp(FILE *fp, DSA *x);
int DSA_print_fp(FILE *bp, DSA *x, int off);
#endif
-int DSA_is_prime(BIGNUM *q,void (*callback)(),void *cb_arg);
+#define DSS_prime_checks 50
+/* Primality test according to FIPS PUB 186[-1], Appendix 2.1:
+ * 50 rounds of Rabin-Miller */
+#define DSA_is_prime(n, callback, cb_arg) \
+ BN_is_prime(n, DSS_prime_checks, callback, NULL, cb_arg)
#ifndef NO_DH
/* Convert DSA structure (key or just parameters) into DH structure
@@ -218,7 +222,6 @@ DH *DSA_dup_DH(DSA *r);
#define DSA_F_DSAPARAMS_PRINT_FP 101
#define DSA_F_DSA_DO_SIGN 112
#define DSA_F_DSA_DO_VERIFY 113
-#define DSA_F_DSA_IS_PRIME 102
#define DSA_F_DSA_NEW 103
#define DSA_F_DSA_PRINT 104
#define DSA_F_DSA_PRINT_FP 105
diff --git a/crypto/dsa/dsa_err.c b/crypto/dsa/dsa_err.c
index 33a8270afd..38e4af968c 100644
--- a/crypto/dsa/dsa_err.c
+++ b/crypto/dsa/dsa_err.c
@@ -70,7 +70,6 @@ static ERR_STRING_DATA DSA_str_functs[]=
{ERR_PACK(0,DSA_F_DSAPARAMS_PRINT_FP,0), "DSAparams_print_fp"},
{ERR_PACK(0,DSA_F_DSA_DO_SIGN,0), "DSA_do_sign"},
{ERR_PACK(0,DSA_F_DSA_DO_VERIFY,0), "DSA_do_verify"},
-{ERR_PACK(0,DSA_F_DSA_IS_PRIME,0), "DSA_is_prime"},
{ERR_PACK(0,DSA_F_DSA_NEW,0), "DSA_new"},
{ERR_PACK(0,DSA_F_DSA_PRINT,0), "DSA_print"},
{ERR_PACK(0,DSA_F_DSA_PRINT_FP,0), "DSA_print_fp"},
diff --git a/crypto/dsa/dsa_gen.c b/crypto/dsa/dsa_gen.c
index 5df9132dd8..f7e0b585a1 100644
--- a/crypto/dsa/dsa_gen.c
+++ b/crypto/dsa/dsa_gen.c
@@ -59,12 +59,18 @@
#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 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 SHA1
#endif
#ifndef NO_SHA
+
#include <stdio.h>
#include <time.h>
#include "cryptlib.h"
@@ -74,8 +80,8 @@
#include <openssl/rand.h>
DSA *DSA_generate_parameters(int bits, unsigned char *seed_in, int seed_len,
- int *counter_ret, unsigned long *h_ret, void (*callback)(),
- void *cb_arg)
+ int *counter_ret, unsigned long *h_ret, void (*callback)(),
+ void *cb_arg)
{
int ok=0;
unsigned char seed[SHA_DIGEST_LENGTH];
@@ -86,19 +92,26 @@ DSA *DSA_generate_parameters(int bits, unsigned char *seed_in, int seed_len,
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,*ctx4=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;
+ 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 ((ctx4=BN_CTX_new()) == NULL) goto err;
if ((ret=DSA_new()) == NULL) goto err;
if ((mont=BN_MONT_CTX_new()) == NULL) goto err;
@@ -116,18 +129,24 @@ DSA *DSA_generate_parameters(int bits, unsigned char *seed_in, int seed_len,
for (;;)
{
- for (;;)
+ for (;;) /* find q */
{
+ int seed_is_random = 0;
+
/* step 1 */
if (callback != NULL) callback(0,m++,cb_arg);
if (!seed_len)
+ {
RAND_pseudo_bytes(seed,SHA_DIGEST_LENGTH);
+ seed_is_random = 1;
+ }
else
+ /* use random seed if 'seed_in' turns out to be bad */
seed_len=0;
-
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]++;
@@ -146,7 +165,12 @@ DSA *DSA_generate_parameters(int bits, unsigned char *seed_in, int seed_len,
if (!BN_bin2bn(md,SHA_DIGEST_LENGTH,q)) goto err;
/* step 4 */
- if (BN_is_prime(q,BN_prime_checks,callback,NULL,cb_arg) > 0) break;
+ r = BN_is_prime_fasttest(q, DSS_prime_checks, callback, ctx3, ctx4, cb_arg, seed_is_random);
+ if (r > 0)
+ break;
+ if (r != 0)
+ goto err;
+
/* do a callback call */
/* step 5 */
}
@@ -156,16 +180,22 @@ DSA *DSA_generate_parameters(int bits, unsigned char *seed_in, int seed_len,
/* 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]++;
@@ -196,17 +226,19 @@ DSA *DSA_generate_parameters(int bits, unsigned char *seed_in, int seed_len,
if (BN_cmp(p,test) >= 0)
{
/* step 11 */
- if (BN_is_prime(p,BN_prime_checks,callback,NULL,cb_arg) > 0)
- goto end;
+ r = BN_is_prime_fasttest(p, DSS_prime_checks, callback, ctx3, ctx4, 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:
@@ -247,90 +279,10 @@ err:
if (h_ret != NULL) *h_ret=h;
}
if (ctx != NULL) BN_CTX_free(ctx);
- if (ctx != NULL) BN_CTX_free(ctx2);
+ if (ctx2 != NULL) BN_CTX_free(ctx2);
+ if (ctx3 != NULL) BN_CTX_free(ctx3);
+ if (ctx4 != NULL) BN_CTX_free(ctx4);
if (mont != NULL) BN_MONT_CTX_free(mont);
return(ok?ret:NULL);
}
-
-int DSA_is_prime(BIGNUM *w, void (*callback)(), void *cb_arg)
- {
- int ok= -1,j,i,n;
- BN_CTX *ctx=NULL,*ctx2=NULL;
- BIGNUM *w_1,*b,*m,*z,*tmp,*mont_1;
- int a;
- BN_MONT_CTX *mont=NULL;
-
- if (!BN_is_odd(w)) return(0);
-
- if ((ctx=BN_CTX_new()) == NULL) goto err;
- if ((ctx2=BN_CTX_new()) == NULL) goto err;
- if ((mont=BN_MONT_CTX_new()) == NULL) goto err;
-
- m= &(ctx2->bn[2]);
- b= &(ctx2->bn[3]);
- z= &(ctx2->bn[4]);
- w_1= &(ctx2->bn[5]);
- tmp= &(ctx2->bn[6]);
- mont_1= &(ctx2->bn[7]);
-
- /* step 1 */
- n=BN_prime_checks_size(BN_num_bits(w));
-
- /* 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;
-
- BN_MONT_CTX_set(mont,w,ctx);
- BN_to_montgomery(mont_1,BN_value_one(),mont,ctx);
- BN_to_montgomery(w_1,w_1,mont,ctx);
- for (i=1; i < n; i++)
- {
- /* step 3 */
- if (!BN_pseudo_rand(b,BN_num_bits(w)-2/*-1*/,0,0))
- goto err;
- /* BN_set_word(b,0x10001L); */
-
- /* step 4 */
- j=0;
- if (!BN_mod_exp_mont(z,b,m,w,ctx,mont)) goto err;
-
- if (!BN_to_montgomery(z,z,mont,ctx)) goto err;
-
- /* step 5 */
- for (;;)
- {
- if (((j == 0) && (BN_cmp(z,mont_1) == 0)) ||
- (BN_cmp(z,w_1) == 0))
- break;
-
- /* step 6 */
- if ((j > 0) && (BN_cmp(z,mont_1) == 0))
- {
- ok=0;
- goto err;
- }
-
- j++;
- if (j >= a)
- {
- ok=0;
- goto err;
- }
-
- if (!BN_mod_mul_montgomery(z,z,z,mont,ctx)) goto err;
- if (callback != NULL) callback(1,j,cb_arg);
- }
- }
-
- ok=1;
-err:
- if (ok == -1) DSAerr(DSA_F_DSA_IS_PRIME,ERR_R_BN_LIB);
- BN_CTX_free(ctx);
- BN_CTX_free(ctx2);
- BN_MONT_CTX_free(mont);
-
- return(ok);
- }
#endif
diff --git a/crypto/dsa/dsatest.c b/crypto/dsa/dsatest.c
index a30dae6b72..f096ed0688 100644
--- a/crypto/dsa/dsatest.c
+++ b/crypto/dsa/dsatest.c
@@ -85,6 +85,9 @@ int main(int argc, char *argv[])
#endif
static void MS_CALLBACK dsa_cb(int p, int n, char *arg);
+
+/* seed, out_p, out_q, out_g are taken from the updated Appendix 5 to
+ * FIPS PUB 186 and also appear in Appendix 5 to FIPS PIB 186-1 */
static unsigned char seed[20]={
0xd5,0x01,0x4e,0x4b,0x60,0xef,0x2b,0xa8,0xb6,0x21,0x1b,0x40,
0x62,0xba,0x32,0x24,0xe0,0x42,0x7d,0xd3,
@@ -141,9 +144,8 @@ int main(int argc, char **argv)
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
BIO_printf(bio_err,"test generation of DSA parameters\n");
- BIO_printf(bio_err,"expect '.*' followed by 3 lines of '.'s and '+'s\n");
- dsa=DSA_generate_parameters(512,seed,20,&counter,&h,dsa_cb,
- (char *)bio_err);
+
+ dsa=DSA_generate_parameters(512,seed,20,&counter,&h,dsa_cb,(char *)bio_err);
BIO_printf(bio_err,"seed\n");
for (i=0; i<20; i+=4)
diff --git a/crypto/sha/sha.h b/crypto/sha/sha.h
index 96daa968fe..5e9cf20cc8 100644
--- a/crypto/sha/sha.h
+++ b/crypto/sha/sha.h
@@ -63,7 +63,7 @@
extern "C" {
#endif
-#if defined(NO_SHA) || defined(NO_SHA0) || defined(NO_SHA1)
+#if defined(NO_SHA) || (defined(NO_SHA0) && defined(NO_SHA1))
#error SHA is disabled.
#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 21:52:15 +0100