#include "bn_lcl.h"
#include "cryptlib.h"
+
#define BN_NIST_192_TOP (192+BN_BITS2-1)/BN_BITS2
#define BN_NIST_224_TOP (224+BN_BITS2-1)/BN_BITS2
#define BN_NIST_256_TOP (256+BN_BITS2-1)/BN_BITS2
#error "unsupported BN_BITS2"
#endif
+
+static const BIGNUM _bignum_nist_p_192 =
+ {
+ (BN_ULONG *)_nist_p_192[0],
+ BN_NIST_192_TOP,
+ BN_NIST_192_TOP,
+ 0,
+ BN_FLG_STATIC_DATA
+ };
+
+static const BIGNUM _bignum_nist_p_224 =
+ {
+ (BN_ULONG *)_nist_p_224[0],
+ BN_NIST_224_TOP,
+ BN_NIST_224_TOP,
+ 0,
+ BN_FLG_STATIC_DATA
+ };
+
+static const BIGNUM _bignum_nist_p_256 =
+ {
+ (BN_ULONG *)_nist_p_256[0],
+ BN_NIST_256_TOP,
+ BN_NIST_256_TOP,
+ 0,
+ BN_FLG_STATIC_DATA
+ };
+
+static const BIGNUM _bignum_nist_p_384 =
+ {
+ (BN_ULONG *)_nist_p_384[0],
+ BN_NIST_384_TOP,
+ BN_NIST_384_TOP,
+ 0,
+ BN_FLG_STATIC_DATA
+ };
+
+static const BIGNUM _bignum_nist_p_521 =
+ {
+ (BN_ULONG *)_nist_p_521,
+ BN_NIST_521_TOP,
+ BN_NIST_521_TOP,
+ 0,
+ BN_FLG_STATIC_DATA
+ };
+
+
const BIGNUM *BN_get0_nist_prime_192(void)
{
- static BIGNUM const_nist_192 = { (BN_ULONG *)_nist_p_192[0],
- BN_NIST_192_TOP, BN_NIST_192_TOP, 0, BN_FLG_STATIC_DATA };
- return &const_nist_192;
+ return &_bignum_nist_p_192;
}
const BIGNUM *BN_get0_nist_prime_224(void)
{
- static BIGNUM const_nist_224 = { (BN_ULONG *)_nist_p_224[0],
- BN_NIST_224_TOP, BN_NIST_224_TOP, 0, BN_FLG_STATIC_DATA };
- return &const_nist_224;
+ return &_bignum_nist_p_224;
}
const BIGNUM *BN_get0_nist_prime_256(void)
{
- static BIGNUM const_nist_256 = { (BN_ULONG *)_nist_p_256[0],
- BN_NIST_256_TOP, BN_NIST_256_TOP, 0, BN_FLG_STATIC_DATA };
- return &const_nist_256;
+ return &_bignum_nist_p_256;
}
const BIGNUM *BN_get0_nist_prime_384(void)
{
- static BIGNUM const_nist_384 = { (BN_ULONG *)_nist_p_384[0],
- BN_NIST_384_TOP, BN_NIST_384_TOP, 0, BN_FLG_STATIC_DATA };
- return &const_nist_384;
+ return &_bignum_nist_p_384;
}
const BIGNUM *BN_get0_nist_prime_521(void)
{
- static BIGNUM const_nist_521 = { (BN_ULONG *)_nist_p_521,
- BN_NIST_521_TOP, BN_NIST_521_TOP, 0, BN_FLG_STATIC_DATA };
- return &const_nist_521;
+ return &_bignum_nist_p_521;
}
-#define BN_NIST_ADD_ONE(a) while (!(*(a)=(*(a)+1)&BN_MASK2)) ++(a);
static void nist_cp_bn_0(BN_ULONG *buf, BN_ULONG *a, int top, int max)
- {
+ {
int i;
- BN_ULONG *_tmp1 = (buf), *_tmp2 = (a);
- for (i = (top); i != 0; i--)
- *_tmp1++ = *_tmp2++;
- for (i = (max) - (top); i != 0; i--)
- *_tmp1++ = (BN_ULONG) 0;
- }
+ BN_ULONG *_tmp1 = (buf), *_tmp2 = (a);
+
+ OPENSSL_assert(top <= max);
+ for (i = (top); i != 0; i--)
+ *_tmp1++ = *_tmp2++;
+ for (i = (max) - (top); i != 0; i--)
+ *_tmp1++ = (BN_ULONG) 0;
+ }
static void nist_cp_bn(BN_ULONG *buf, BN_ULONG *a, int top)
- {
+ {
int i;
- BN_ULONG *_tmp1 = (buf), *_tmp2 = (a);
- for (i = (top); i != 0; i--)
- *_tmp1++ = *_tmp2++;
- }
+ BN_ULONG *_tmp1 = (buf), *_tmp2 = (a);
+ for (i = (top); i != 0; i--)
+ *_tmp1++ = *_tmp2++;
+ }
#if BN_BITS2 == 64
#define bn_cp_64(to, n, from, m) (to)[n] = (m>=0)?((from)[m]):0;
*res;
size_t mask;
+ field = &_bignum_nist_p_192; /* just to make sure */
+
+ if (BN_is_negative(a) || a->top > 2*BN_NIST_192_TOP)
+ return BN_nnmod(r, field, a, ctx);
+
i = BN_ucmp(field, a);
if (i == 0)
{
else if (i > 0)
return (r == a) ? 1 : (BN_copy(r ,a) != NULL);
- if (top == BN_NIST_192_TOP)
- return BN_usub(r, a, field);
-
if (r != a)
{
if (!bn_wexpand(r, BN_NIST_192_TOP))
r->top = BN_NIST_192_TOP;
bn_correct_top(r);
+ if (BN_ucmp(field, r) <= 0)
+ {
+ if (!BN_usub(r, r, field)) return 0;
+ }
+
return 1;
}
size_t mask;
union { bn_addsub_f f; size_t p; } u;
+ field = &_bignum_nist_p_224; /* just to make sure */
+
+ if (BN_is_negative(a) || a->top > 2*BN_NIST_224_TOP)
+ return BN_nnmod(r, field, a, ctx);
+
i = BN_ucmp(field, a);
if (i == 0)
{
else if (i > 0)
return (r == a)? 1 : (BN_copy(r ,a) != NULL);
- if (top == BN_NIST_224_TOP)
- return BN_usub(r, a, field);
-
if (r != a)
{
if (!bn_wexpand(r, BN_NIST_224_TOP))
r->top = BN_NIST_224_TOP;
bn_correct_top(r);
+ if (BN_ucmp(field, r) <= 0)
+ {
+ if (!BN_usub(r, r, field)) return 0;
+ }
+
return 1;
}
size_t mask;
union { bn_addsub_f f; size_t p; } u;
+ field = &_bignum_nist_p_256; /* just to make sure */
+
+ if (BN_is_negative(a) || a->top > 2*BN_NIST_256_TOP)
+ return BN_nnmod(r, field, a, ctx);
+
i = BN_ucmp(field, a);
if (i == 0)
{
else if (i > 0)
return (r == a)? 1 : (BN_copy(r ,a) != NULL);
- if (top == BN_NIST_256_TOP)
- return BN_usub(r, a, field);
-
if (r != a)
{
if (!bn_wexpand(r, BN_NIST_256_TOP))
r->top = BN_NIST_256_TOP;
bn_correct_top(r);
+ if (BN_ucmp(field, r) <= 0)
+ {
+ if (!BN_usub(r, r, field)) return 0;
+ }
+
return 1;
}
size_t mask;
union { bn_addsub_f f; size_t p; } u;
+ field = &_bignum_nist_p_384; /* just to make sure */
+
+ if (BN_is_negative(a) || a->top > 2*BN_NIST_384_TOP)
+ return BN_nnmod(r, field, a, ctx);
+
i = BN_ucmp(field, a);
if (i == 0)
{
else if (i > 0)
return (r == a)? 1 : (BN_copy(r ,a) != NULL);
- if (top == BN_NIST_384_TOP)
- return BN_usub(r, a, field);
-
if (r != a)
{
if (!bn_wexpand(r, BN_NIST_384_TOP))
r->top = BN_NIST_384_TOP;
bn_correct_top(r);
+ if (BN_ucmp(field, r) <= 0)
+ {
+ if (!BN_usub(r, r, field)) return 0;
+ }
+
return 1;
}
BN_ULONG *r_d;
BIGNUM *tmp;
+ field = &_bignum_nist_p_521; /* just to make sure */
+
+ if (BN_is_negative(a))
+ return BN_nnmod(r, field, a, ctx);
+
/* check whether a reduction is necessary */
top = a->top;
if (top < BN_NIST_521_TOP || ( top == BN_NIST_521_TOP &&
- (!(a->d[BN_NIST_521_TOP-1] & ~(BN_NIST_521_TOP_MASK)))))
- return (r == a)? 1 : (BN_copy(r ,a) != NULL);
+ (!(a->d[BN_NIST_521_TOP-1] & ~(BN_NIST_521_TOP_MASK)))))
+ {
+ int i = BN_ucmp(field, a);
+ if (i == 0)
+ {
+ BN_zero(r);
+ return 1;
+ }
+ else
+ {
+#ifdef BN_DEBUG
+ OPENSSL_assert(i > 0); /* because 'field' is 1111...1111 */
+#endif
+ return (r == a)? 1 : (BN_copy(r ,a) != NULL);
+ }
+ }
+
+ if (BN_num_bits(a) > 2*521)
+ return BN_nnmod(r, field, a, ctx);
BN_CTX_start(ctx);
tmp = BN_CTX_get(ctx);
if (!BN_uadd(r, tmp, r))
goto err;
- top = r->top;
- r_d = r->d;
- if (top == BN_NIST_521_TOP &&
- (r_d[BN_NIST_521_TOP-1] & ~(BN_NIST_521_TOP_MASK)))
+
+ if (BN_ucmp(field, r) <= 0)
{
- BN_NIST_ADD_ONE(r_d)
- r->d[BN_NIST_521_TOP-1] &= BN_NIST_521_TOP_MASK;
+ if (!BN_usub(r, r, field)) goto err;
}
- bn_correct_top(r);
ret = 1;
err:
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