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bn_nist.c: harmonize buf in BN_nist_mod_256 with other mod functions.

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This commit is contained in:
Andy Polyakov 2012-01-06 13:17:47 +00:00
parent 8e85545284
commit ce0727f9bd
1 changed files with 19 additions and 13 deletions
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32
crypto/bn/bn_nist.c
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@ -306,10 +306,11 @@ 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 *buf, const BN_ULONG *a, int top, int max)
{ {
int i; int i;
BN_ULONG *_tmp1 = (buf), *_tmp2 = (a); BN_ULONG *_tmp1 = (buf);
const BN_ULONG *_tmp2 = (a);
#ifdef BN_DEBUG #ifdef BN_DEBUG
OPENSSL_assert(top <= max); OPENSSL_assert(top <= max);
@ -320,10 +321,12 @@ static void nist_cp_bn_0(BN_ULONG *buf, BN_ULONG *a, int top, int max)
*_tmp1++ = (BN_ULONG) 0; *_tmp1++ = (BN_ULONG) 0;
} }
static void nist_cp_bn(BN_ULONG *buf, BN_ULONG *a, int top) static void nist_cp_bn(BN_ULONG *buf, const BN_ULONG *a, int top)
{ {
int i; int i;
BN_ULONG *_tmp1 = (buf), *_tmp2 = (a); BN_ULONG *_tmp1 = (buf);
const BN_ULONG *_tmp2 = (a);
for (i = (top); i != 0; i--) for (i = (top); i != 0; i--)
*_tmp1++ = *_tmp2++; *_tmp1++ = *_tmp2++;
} }
@ -499,8 +502,11 @@ int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
int top = a->top, i; int top = a->top, i;
int carry; int carry;
BN_ULONG *r_d, *a_d = a->d; BN_ULONG *r_d, *a_d = a->d;
BN_ULONG buf[BN_NIST_224_TOP], union {
c_d[BN_NIST_224_TOP], 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; *res;
PTR_SIZE_INT mask; PTR_SIZE_INT mask;
union { bn_addsub_f f; PTR_SIZE_INT p; } u; union { bn_addsub_f f; PTR_SIZE_INT p; } u;
@ -539,18 +545,18 @@ int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
/* copy upper 256 bits of 448 bit number ... */ /* 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); 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 */ /* ... 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 */ /* truncate lower part to 224 bits too */
r_d[BN_NIST_224_TOP-1] &= BN_MASK2l; r_d[BN_NIST_224_TOP-1] &= BN_MASK2l;
#else #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 #endif
#if defined(NIST_INT64) && BN_BITS2!=64 #if defined(NIST_INT64) && BN_BITS2!=64
{ {
NIST_INT64 acc; /* accumulator */ NIST_INT64 acc; /* accumulator */
unsigned int *rp=(unsigned int *)r_d; 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 = rp[0]; acc -= bp[7-7];
acc -= bp[11-7]; rp[0] = (unsigned int)acc; acc >>= 32; acc -= bp[11-7]; rp[0] = (unsigned int)acc; acc >>= 32;
@ -585,13 +591,13 @@ int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
{ {
BN_ULONG t_d[BN_NIST_224_TOP]; 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); 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); 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); 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); carry -= (int)bn_sub_words(r_d, r_d, t_d, BN_NIST_224_TOP);
#if BN_BITS2==64 #if BN_BITS2==64