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Fix remaining BN_nist_mod_*.

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PR: 1593
This commit is contained in:
Andy Polyakov 2008-04-18 15:40:57 +00:00
parent e6ef05d5f3
commit 299ab428ce
1 changed files with 125 additions and 110 deletions
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235
crypto/bn/bn_nist.c
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@ -171,13 +171,6 @@ const BIGNUM *BN_get0_nist_prime_521(void)
return &const_nist_521;
}
/* some misc internal functions */
#if BN_BITS2 != 64
static BN_ULONG _256_data[BN_NIST_256_TOP*6];
static int _is_set_256_data = 0;
static void _init_256_data(void);
#endif
#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)
@ -251,9 +244,13 @@ int BN_nist_mod_192(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
BN_CTX *ctx)
{
int top = a->top, i;
int carry;
register BN_ULONG *r_d, *a_d = a->d;
BN_ULONG t_d[BN_NIST_192_TOP],
buf[BN_NIST_192_TOP];
buf[BN_NIST_192_TOP],
c_d[BN_NIST_192_TOP],
*res;
size_t mask;
i = BN_ucmp(field, a);
if (i == 0)
@ -285,30 +282,31 @@ int BN_nist_mod_192(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
#endif
nist_set_192(t_d, buf, 0, 3, 3);
if (bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP))
bn_sub_words(r_d, r_d, _nist_p_192, BN_NIST_192_TOP);
carry = bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP);
mask = 0-(size_t)bn_sub_words(c_d,r_d,_nist_p_192,BN_NIST_192_TOP);
mask = ~mask | (0-(size_t)carry);
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
nist_set_192(t_d, buf, 4, 4, 0);
if (bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP))
bn_sub_words(r_d, r_d, _nist_p_192, BN_NIST_192_TOP);
carry = bn_add_words(r_d, res, t_d, BN_NIST_192_TOP);
mask = 0-(size_t)bn_sub_words(c_d,r_d,_nist_p_192,BN_NIST_192_TOP);
mask = ~mask | (0-(size_t)carry);
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
#if defined(OPENSSL_SYS_VMS) && defined(__DECC)
# pragma message restore
#endif
nist_set_192(t_d, buf, 5, 5, 5)
if (bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP))
bn_sub_words(r_d, r_d, _nist_p_192, BN_NIST_192_TOP);
carry = bn_add_words(r_d, res, t_d, BN_NIST_192_TOP);
mask = 0-(size_t)bn_sub_words(c_d,r_d,_nist_p_192,BN_NIST_192_TOP);
mask = ~mask | (0-(size_t)carry);
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
nist_cp_bn(r_d, res, BN_NIST_192_TOP);
r->top = BN_NIST_192_TOP;
bn_correct_top(r);
if (BN_ucmp(r, field) >= 0)
{
bn_sub_words(r_d, r_d, _nist_p_192, BN_NIST_192_TOP);
bn_correct_top(r);
}
bn_check_top(r);
return 1;
}
@ -328,9 +326,13 @@ int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
{
#if BN_BITS2 == 32
int top = a->top, i;
int carry;
BN_ULONG *r_d, *a_d = a->d;
BN_ULONG t_d[BN_NIST_224_TOP],
buf[BN_NIST_224_TOP];
buf[BN_NIST_224_TOP],
c_d[BN_NIST_224_TOP],
*res;
size_t mask;
i = BN_ucmp(field, a);
if (i == 0)
@ -357,52 +359,48 @@ int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
nist_cp_bn_0(buf, a_d + BN_NIST_224_TOP, top - BN_NIST_224_TOP, BN_NIST_224_TOP);
nist_set_224(t_d, buf, 10, 9, 8, 7, 0, 0, 0);
if (bn_add_words(r_d, r_d, t_d, BN_NIST_224_TOP))
bn_sub_words(r_d,r_d,_nist_p_224,BN_NIST_224_TOP);
carry = bn_add_words(r_d, r_d, t_d, BN_NIST_224_TOP);
mask = 0-(size_t)bn_sub_words(c_d,r_d,_nist_p_224,BN_NIST_224_TOP);
mask = ~mask | (0-(size_t)carry);
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
nist_set_224(t_d, buf, 0, 13, 12, 11, 0, 0, 0);
if (bn_add_words(r_d, r_d, t_d, BN_NIST_224_TOP))
bn_sub_words(r_d,r_d,_nist_p_224,BN_NIST_224_TOP);
nist_set_224(t_d, buf, 13, 12, 11, 10, 9, 8, 7);
if (bn_sub_words(r_d, r_d, t_d, BN_NIST_224_TOP))
bn_add_words(r_d,r_d,_nist_p_224,BN_NIST_224_TOP);
nist_set_224(t_d, buf, 0, 0, 0, 0, 13, 12, 11);
if (bn_sub_words(r_d, r_d, t_d, BN_NIST_224_TOP))
bn_add_words(r_d,r_d,_nist_p_224,BN_NIST_224_TOP);
carry = bn_add_words(r_d, res, t_d, BN_NIST_224_TOP);
mask = 0-(size_t)bn_sub_words(c_d,r_d,_nist_p_224,BN_NIST_224_TOP);
mask = ~mask | (0-(size_t)carry);
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
nist_set_224(t_d, buf, 13, 12, 11, 10, 9, 8, 7);
#if BRANCH_FREE
carry = bn_sub_words(r_d, res, t_d, BN_NIST_224_TOP);
bn_add_words(c_d,r_d,_nist_p_224,BN_NIST_224_TOP);
mask = 0-(size_t)carry;
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
#else
if (bn_sub_words(r_d, res, t_d, BN_NIST_224_TOP))
bn_add_words(r_d,r_d,_nist_p_224,BN_NIST_224_TOP);
#endif
nist_set_224(t_d, buf, 0, 0, 0, 0, 13, 12, 11);
#if BRANCH_FREE
carry = bn_sub_words(r_d, res, t_d, BN_NIST_224_TOP);
bn_add_words(c_d,r_d,_nist_p_224,BN_NIST_224_TOP);
mask = 0-(size_t)carry;
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
nist_cp_bn(r_d, res, BN_NIST_224_TOP);
#else
if (bn_sub_words(r_d, r_d, t_d, BN_NIST_224_TOP))
bn_add_words(r_d,r_d,_nist_p_224,BN_NIST_224_TOP);
#endif
r->top = BN_NIST_224_TOP;
bn_correct_top(r);
if (BN_ucmp(r, field) >= 0)
{
bn_sub_words(r_d, r_d, _nist_p_224, BN_NIST_224_TOP);
bn_correct_top(r);
}
bn_check_top(r);
return 1;
#else
#else /* BN_BITS!=32 */
return 0;
#endif
}
#if BN_BITS2 == 32
static void _init_256_data(void)
{
int i;
BN_ULONG *tmp1 = _256_data;
const BN_ULONG *tmp2 = tmp1;
memcpy(tmp1, _nist_p_256, BN_NIST_256_TOP * sizeof(BN_ULONG));
tmp1 += BN_NIST_256_TOP;
for (i=0; i<5; i++)
{
bn_add_words(tmp1, _nist_p_256, tmp2, BN_NIST_256_TOP);
tmp2 = tmp1;
tmp1 += BN_NIST_256_TOP;
}
_is_set_256_data = 1;
}
#endif
#define nist_set_256(to, from, a1, a2, a3, a4, a5, a6, a7, a8) \
{ \
if (a8 != 0) bn_cp_32(to, 0, from, (a8) - 8) else bn_32_set_0(to, 0)\
@ -423,19 +421,11 @@ int BN_nist_mod_256(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
int carry = 0;
register BN_ULONG *a_d = a->d, *r_d;
BN_ULONG t_d[BN_NIST_256_TOP],
t_d2[BN_NIST_256_TOP],
buf[BN_NIST_256_TOP];
buf[BN_NIST_256_TOP],
c_d[BN_NIST_256_TOP],
*res;
size_t mask;
if (!_is_set_256_data)
{
CRYPTO_w_lock(CRYPTO_LOCK_BN);
if (!_is_set_256_data)
_init_256_data();
CRYPTO_w_unlock(CRYPTO_LOCK_BN);
}
i = BN_ucmp(field, a);
if (i == 0)
{
@ -463,62 +453,87 @@ int BN_nist_mod_256(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
/*S1*/
nist_set_256(t_d, buf, 15, 14, 13, 12, 11, 0, 0, 0);
/*S2*/
nist_set_256(t_d2,buf, 0, 15, 14, 13, 12, 0, 0, 0);
carry = bn_add_words(t_d, t_d, t_d2, BN_NIST_256_TOP);
/* left shift */
{
register BN_ULONG *ap,t,c;
ap = t_d;
c=0;
for (i = BN_NIST_256_TOP; i != 0; --i)
{
t= *ap;
*(ap++)=((t<<1)|c)&BN_MASK2;
c=(t & BN_TBIT)?1:0;
}
carry <<= 1;
carry |= c;
}
nist_set_256(c_d,buf, 0, 15, 14, 13, 12, 0, 0, 0);
carry = bn_add_words(t_d, t_d, c_d, BN_NIST_256_TOP);
mask = 0-(size_t)bn_sub_words(c_d,t_d,_nist_p_256,BN_NIST_256_TOP);
mask = ~mask | (0-(size_t)carry);
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)t_d&~mask));
carry = bn_add_words(t_d, res, res, BN_NIST_256_TOP);
mask = 0-(size_t)bn_sub_words(c_d,t_d,_nist_p_256,BN_NIST_256_TOP);
mask = ~mask | (0-(size_t)carry);
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)t_d&~mask));
carry = bn_add_words(r_d, r_d, res, BN_NIST_256_TOP);
mask = 0-(size_t)bn_sub_words(c_d,r_d,_nist_p_256,BN_NIST_256_TOP);
mask = ~mask | (0-(size_t)carry);
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
carry += bn_add_words(r_d, r_d, t_d, BN_NIST_256_TOP);
/*S3*/
nist_set_256(t_d, buf, 15, 14, 0, 0, 0, 10, 9, 8);
carry += bn_add_words(r_d, r_d, t_d, BN_NIST_256_TOP);
carry = bn_add_words(r_d, res, t_d, BN_NIST_256_TOP);
mask = 0-(size_t)bn_sub_words(c_d,r_d,_nist_p_256,BN_NIST_256_TOP);
mask = ~mask | (0-(size_t)carry);
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
/*S4*/
nist_set_256(t_d, buf, 8, 13, 15, 14, 13, 11, 10, 9);
carry += bn_add_words(r_d, r_d, t_d, BN_NIST_256_TOP);
if (carry)
bn_sub_words(r_d, r_d, _256_data + BN_NIST_256_TOP *
(carry-1), BN_NIST_256_TOP);
carry = bn_add_words(r_d, res, t_d, BN_NIST_256_TOP);
mask = 0-(size_t)bn_sub_words(c_d,r_d,_nist_p_256,BN_NIST_256_TOP);
mask = ~mask | (0-(size_t)carry);
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
/*D1*/
nist_set_256(t_d, buf, 10, 8, 0, 0, 0, 13, 12, 11);
carry = bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP);
#if BRANCH_FREE
carry = bn_sub_words(r_d, res, t_d, BN_NIST_256_TOP);
bn_add_words(c_d,r_d,_nist_p_256,BN_NIST_256_TOP);
mask = 0-(size_t)carry;
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
#else
if (bn_sub_words(r_d, res, t_d, BN_NIST_256_TOP))
bn_add_words(r_d,r_d,_nist_p_256,BN_NIST_256_TOP);
#endif
/*D2*/
nist_set_256(t_d, buf, 11, 9, 0, 0, 15, 14, 13, 12);
carry += bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP);
#if BRANCH_FREE
carry = bn_sub_words(r_d, res, t_d, BN_NIST_256_TOP);
bn_add_words(c_d,r_d,_nist_p_256,BN_NIST_256_TOP);
mask = 0-(size_t)carry;
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
#else
if (bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP))
bn_add_words(r_d,r_d,_nist_p_256,BN_NIST_256_TOP);
#endif
/*D3*/
nist_set_256(t_d, buf, 12, 0, 10, 9, 8, 15, 14, 13);
carry += bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP);
#if BRANCH_FREE
carry = bn_sub_words(r_d, res, t_d, BN_NIST_256_TOP);
bn_add_words(c_d,r_d,_nist_p_256,BN_NIST_256_TOP);
mask = 0-(size_t)carry;
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
#else
if (bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP))
bn_add_words(r_d,r_d,_nist_p_256,BN_NIST_256_TOP);
#endif
/*D4*/
nist_set_256(t_d, buf, 13, 0, 11, 10, 9, 0, 15, 14);
carry += bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP);
if (carry)
bn_add_words(r_d, r_d, _256_data + BN_NIST_256_TOP *
(carry-1), BN_NIST_256_TOP);
#if BRANCH_FREE
carry = bn_sub_words(r_d, res, t_d, BN_NIST_256_TOP);
bn_add_words(c_d,r_d,_nist_p_256,BN_NIST_256_TOP);
mask = 0-(size_t)carry;
res = (BN_ULONG *)(((size_t)c_d&mask) | ((size_t)r_d&~mask));
nist_cp_bn(r_d, res, BN_NIST_384_TOP);
#else
if (bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP))
bn_add_words(r_d,r_d,_nist_p_256,BN_NIST_256_TOP);
#endif
r->top = BN_NIST_256_TOP;
bn_correct_top(r);
if (BN_ucmp(r, field) >= 0)
{
bn_sub_words(r_d, r_d, _nist_p_256, BN_NIST_256_TOP);
bn_correct_top(r);
}
bn_check_top(r);
return 1;
#else
#else /* BN_BITS!=32 */
return 0;
#endif
}
@ -679,7 +694,7 @@ int BN_nist_mod_384(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
bn_correct_top(r);
return 1;
#else
#else /* BN_BITS!=32 */
return 0;
#endif
}