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bn_nist.c: cumulative update from master.

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PR: 2981, 2837
This commit is contained in:
Andy Polyakov 2013-02-16 11:38:46 +01:00
parent 08f8933fa3
commit ef4b9f001a
1 changed files with 31 additions and 24 deletions
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55
crypto/bn/bn_nist.c
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@ -286,26 +286,25 @@ const BIGNUM *BN_get0_nist_prime_521(void)
}
static void nist_cp_bn_0(BN_ULONG *buf, BN_ULONG *a, int top, int max)
static void nist_cp_bn_0(BN_ULONG *dst, const BN_ULONG *src, int top, int max)
{
int i;
BN_ULONG *_tmp1 = (buf), *_tmp2 = (a);
#ifdef BN_DEBUG
OPENSSL_assert(top <= max);
#endif
for (i = (top); i != 0; i--)
*_tmp1++ = *_tmp2++;
for (i = (max) - (top); i != 0; i--)
*_tmp1++ = (BN_ULONG) 0;
for (i = 0; i < top; i++)
dst[i] = src[i];
for (; i < max; i++)
dst[i] = 0;
}
static void nist_cp_bn(BN_ULONG *buf, BN_ULONG *a, int top)
static void nist_cp_bn(BN_ULONG *dst, const BN_ULONG *src, int top)
{
int i;
BN_ULONG *_tmp1 = (buf), *_tmp2 = (a);
for (i = (top); i != 0; i--)
*_tmp1++ = *_tmp2++;
for (i = 0; i < top; i++)
dst[i] = src[i];
}
#if BN_BITS2 == 64
@ -451,8 +450,9 @@ int BN_nist_mod_192(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
*/
mask = 0-(PTR_SIZE_INT)bn_sub_words(c_d,r_d,_nist_p_192[0],BN_NIST_192_TOP);
mask &= 0-(PTR_SIZE_INT)carry;
res = c_d;
res = (BN_ULONG *)
(((PTR_SIZE_INT)c_d&~mask) | ((PTR_SIZE_INT)r_d&mask));
(((PTR_SIZE_INT)res&~mask) | ((PTR_SIZE_INT)r_d&mask));
nist_cp_bn(r_d, res, BN_NIST_192_TOP);
r->top = BN_NIST_192_TOP;
bn_correct_top(r);
@ -479,8 +479,11 @@ int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
int top = a->top, i;
int carry;
BN_ULONG *r_d, *a_d = a->d;
BN_ULONG buf[BN_NIST_224_TOP],
c_d[BN_NIST_224_TOP],
union {
BN_ULONG bn[BN_NIST_224_TOP];
unsigned int ui[BN_NIST_224_TOP*sizeof(BN_ULONG)/sizeof(unsigned int)];
} buf;
BN_ULONG c_d[BN_NIST_224_TOP],
*res;
PTR_SIZE_INT mask;
union { bn_addsub_f f; PTR_SIZE_INT p; } u;
@ -519,18 +522,18 @@ int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
/* copy upper 256 bits of 448 bit number ... */
nist_cp_bn_0(c_d, a_d + (BN_NIST_224_TOP-1), top - (BN_NIST_224_TOP-1), BN_NIST_224_TOP);
/* ... and right shift by 32 to obtain upper 224 bits */
nist_set_224(buf, c_d, 14, 13, 12, 11, 10, 9, 8);
nist_set_224(buf.bn, c_d, 14, 13, 12, 11, 10, 9, 8);
/* truncate lower part to 224 bits too */
r_d[BN_NIST_224_TOP-1] &= BN_MASK2l;
#else
nist_cp_bn_0(buf, a_d + BN_NIST_224_TOP, top - BN_NIST_224_TOP, BN_NIST_224_TOP);
nist_cp_bn_0(buf.bn, a_d + BN_NIST_224_TOP, top - BN_NIST_224_TOP, BN_NIST_224_TOP);
#endif
#if defined(NIST_INT64) && BN_BITS2!=64
{
NIST_INT64 acc; /* accumulator */
unsigned int *rp=(unsigned int *)r_d;
const unsigned int *bp=(const unsigned int *)buf;
const unsigned int *bp=(const unsigned int *)buf.ui;
acc = rp[0]; acc -= bp[7-7];
acc -= bp[11-7]; rp[0] = (unsigned int)acc; acc >>= 32;
@ -565,13 +568,13 @@ int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
{
BN_ULONG t_d[BN_NIST_224_TOP];
nist_set_224(t_d, buf, 10, 9, 8, 7, 0, 0, 0);
nist_set_224(t_d, buf.bn, 10, 9, 8, 7, 0, 0, 0);
carry = (int)bn_add_words(r_d, r_d, t_d, BN_NIST_224_TOP);
nist_set_224(t_d, buf, 0, 13, 12, 11, 0, 0, 0);
nist_set_224(t_d, buf.bn, 0, 13, 12, 11, 0, 0, 0);
carry += (int)bn_add_words(r_d, r_d, t_d, BN_NIST_224_TOP);
nist_set_224(t_d, buf, 13, 12, 11, 10, 9, 8, 7);
nist_set_224(t_d, buf.bn, 13, 12, 11, 10, 9, 8, 7);
carry -= (int)bn_sub_words(r_d, r_d, t_d, BN_NIST_224_TOP);
nist_set_224(t_d, buf, 0, 0, 0, 0, 13, 12, 11);
nist_set_224(t_d, buf.bn, 0, 0, 0, 0, 13, 12, 11);
carry -= (int)bn_sub_words(r_d, r_d, t_d, BN_NIST_224_TOP);
#if BN_BITS2==64
@ -606,7 +609,8 @@ int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
/* otherwise it's effectively same as in BN_nist_mod_192... */
mask = 0-(PTR_SIZE_INT)(*u.f)(c_d,r_d,_nist_p_224[0],BN_NIST_224_TOP);
mask &= 0-(PTR_SIZE_INT)carry;
res = (BN_ULONG *)(((PTR_SIZE_INT)c_d&~mask) |
res = c_d;
res = (BN_ULONG *)(((PTR_SIZE_INT)res&~mask) |
((PTR_SIZE_INT)r_d&mask));
nist_cp_bn(r_d, res, BN_NIST_224_TOP);
r->top = BN_NIST_224_TOP;
@ -805,7 +809,8 @@ int BN_nist_mod_256(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
mask = 0-(PTR_SIZE_INT)(*u.f)(c_d,r_d,_nist_p_256[0],BN_NIST_256_TOP);
mask &= 0-(PTR_SIZE_INT)carry;
res = (BN_ULONG *)(((PTR_SIZE_INT)c_d&~mask) |
res = c_d;
res = (BN_ULONG *)(((PTR_SIZE_INT)res&~mask) |
((PTR_SIZE_INT)r_d&mask));
nist_cp_bn(r_d, res, BN_NIST_256_TOP);
r->top = BN_NIST_256_TOP;
@ -1026,7 +1031,8 @@ int BN_nist_mod_384(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
mask = 0-(PTR_SIZE_INT)(*u.f)(c_d,r_d,_nist_p_384[0],BN_NIST_384_TOP);
mask &= 0-(PTR_SIZE_INT)carry;
res = (BN_ULONG *)(((PTR_SIZE_INT)c_d&~mask) |
res = c_d;
res = (BN_ULONG *)(((PTR_SIZE_INT)res&~mask) |
((PTR_SIZE_INT)r_d&mask));
nist_cp_bn(r_d, res, BN_NIST_384_TOP);
r->top = BN_NIST_384_TOP;
@ -1092,7 +1098,8 @@ int BN_nist_mod_521(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
bn_add_words(r_d,r_d,t_d,BN_NIST_521_TOP);
mask = 0-(PTR_SIZE_INT)bn_sub_words(t_d,r_d,_nist_p_521,BN_NIST_521_TOP);
res = (BN_ULONG *)(((PTR_SIZE_INT)t_d&~mask) |
res = t_d;
res = (BN_ULONG *)(((PTR_SIZE_INT)res&~mask) |
((PTR_SIZE_INT)r_d&mask));
nist_cp_bn(r_d,res,BN_NIST_521_TOP);
r->top = BN_NIST_521_TOP;