* [including the GNU Public Licence.]
*/
/* ====================================================================
- * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
+ * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
*/
#include "bn_prime.h"
-static int witness(BIGNUM *w, BIGNUM *a, BIGNUM *a1, BIGNUM *a1_odd, int k,
- BN_CTX *ctx, BN_MONT_CTX *mont);
+static int witness(BIGNUM *w, const BIGNUM *a, const BIGNUM *a1,
+ const BIGNUM *a1_odd, int k, BN_CTX *ctx, BN_MONT_CTX *mont);
static int probable_prime(BIGNUM *rnd, int bits);
static int probable_prime_dh(BIGNUM *rnd, int bits,
- BIGNUM *add, BIGNUM *rem, BN_CTX *ctx);
+ const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx);
static int probable_prime_dh_safe(BIGNUM *rnd, int bits,
- BIGNUM *add, BIGNUM *rem, BN_CTX *ctx);
+ const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx);
-BIGNUM *BN_generate_prime(BIGNUM *ret, int bits, int safe, BIGNUM *add,
- BIGNUM *rem, void (*callback)(int,int,void *), void *cb_arg)
+BIGNUM *BN_generate_prime(BIGNUM *ret, int bits, int safe,
+ const BIGNUM *add, const BIGNUM *rem,
+ void (*callback)(int,int,void *), void *cb_arg)
{
BIGNUM *rnd=NULL;
BIGNUM t;
BN_CTX *ctx = NULL;
BIGNUM *A1, *A1_odd, *check; /* taken from ctx */
BN_MONT_CTX *mont = NULL;
- BIGNUM *A;
+ const BIGNUM *A = NULL;
+ if (BN_cmp(a, BN_value_one()) <= 0)
+ return 0;
+
if (checks == BN_prime_checks)
checks = BN_prime_checks_for_size(BN_num_bits(a));
/* first look for small factors */
if (!BN_is_odd(a))
- return(0);
+ return 0;
if (do_trial_division)
{
for (i = 1; i < NUMPRIMES; i++)
else
if ((ctx=BN_CTX_new()) == NULL)
goto err;
+ BN_CTX_start(ctx);
+
/* A := abs(a) */
if (a->neg)
{
- A = &(ctx->bn[ctx->tos++]);
- BN_copy(A, a);
- A->neg = 0;
+ BIGNUM *t;
+ if ((t = BN_CTX_get(ctx)) == NULL) goto err;
+ BN_copy(t, a);
+ t->neg = 0;
+ A = t;
}
else
A = a;
- A1 = &(ctx->bn[ctx->tos++]);
- A1_odd = &(ctx->bn[ctx->tos++]);
- check = &(ctx->bn[ctx->tos++]);;
+ A1 = BN_CTX_get(ctx);
+ A1_odd = BN_CTX_get(ctx);
+ check = BN_CTX_get(ctx);
+ if (check == NULL) goto err;
/* compute A1 := A - 1 */
if (!BN_copy(A1, A))
for (i = 0; i < checks; i++)
{
- if (!BN_pseudo_rand(check, BN_num_bits(A1), 0, 0))
+ if (!BN_pseudo_rand_range(check, A1))
goto err;
- if (BN_cmp(check, A1) >= 0)
- if (!BN_sub(check, check, A1))
- goto err;
if (!BN_add_word(check, 1))
goto err;
/* now 1 <= check < A */
}
ret=1;
err:
- if (ctx_passed != NULL)
+ if (ctx != NULL)
{
- ctx_passed->tos -= 3; /* A1, A1_odd, check */
- if (a != A)
- --ctx_passed->tos; /* A */
+ BN_CTX_end(ctx);
+ if (ctx_passed == NULL)
+ BN_CTX_free(ctx);
}
- else if (ctx != NULL)
- BN_CTX_free(ctx);
if (mont != NULL)
BN_MONT_CTX_free(mont);
return(ret);
}
-static int witness(BIGNUM *w, BIGNUM *a, BIGNUM *a1, BIGNUM *a1_odd, int k,
- BN_CTX *ctx, BN_MONT_CTX *mont)
+static int witness(BIGNUM *w, const BIGNUM *a, const BIGNUM *a1,
+ const BIGNUM *a1_odd, int k, BN_CTX *ctx, BN_MONT_CTX *mont)
{
if (!BN_mod_exp_mont(w, w, a1_odd, a, ctx, mont)) /* w := w^a1_odd mod a */
return -1;
d=delta;
delta+=2;
/* perhaps need to check for overflow of
- * delta (but delta can be upto 2^32)
+ * delta (but delta can be up to 2^32)
* 21-May-98 eay - added overflow check */
if (delta < d) goto again;
goto loop;
return(1);
}
-static int probable_prime_dh(BIGNUM *rnd, int bits, BIGNUM *add, BIGNUM *rem,
- BN_CTX *ctx)
+static int probable_prime_dh(BIGNUM *rnd, int bits,
+ const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx)
{
int i,ret=0;
BIGNUM *t1;
- t1= &(ctx->bn[ctx->tos++]);
+ BN_CTX_start(ctx);
+ if ((t1 = BN_CTX_get(ctx)) == NULL) goto err;
if (!BN_rand(rnd,bits,0,1)) goto err;
}
ret=1;
err:
- ctx->tos--;
+ BN_CTX_end(ctx);
return(ret);
}
-static int probable_prime_dh_safe(BIGNUM *p, int bits, BIGNUM *padd,
- BIGNUM *rem, BN_CTX *ctx)
+static int probable_prime_dh_safe(BIGNUM *p, int bits, const BIGNUM *padd,
+ const BIGNUM *rem, BN_CTX *ctx)
{
int i,ret=0;
- BIGNUM *t1,*qadd=NULL,*q=NULL;
+ BIGNUM *t1,*qadd,*q;
bits--;
- t1= &(ctx->bn[ctx->tos++]);
- q= &(ctx->bn[ctx->tos++]);
- qadd= &(ctx->bn[ctx->tos++]);
+ BN_CTX_start(ctx);
+ t1 = BN_CTX_get(ctx);
+ q = BN_CTX_get(ctx);
+ qadd = BN_CTX_get(ctx);
+ if (qadd == NULL) goto err;
if (!BN_rshift1(qadd,padd)) goto err;
}
ret=1;
err:
- ctx->tos-=3;
+ BN_CTX_end(ctx);
return(ret);
}