X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fbn%2Fbn_nist.c;h=a5e07acd851a8d77b35f7af5418117bcbd1b6093;hp=bd04e7e29da55b253fd28f29d75c328c0fba22d4;hb=323154be3326a329f768958e9229585a84985747;hpb=f8d6be3f8170c4aa3bea1618994f912629f3d0c3 diff --git a/crypto/bn/bn_nist.c b/crypto/bn/bn_nist.c index bd04e7e29d..a5e07acd85 100644 --- a/crypto/bn/bn_nist.c +++ b/crypto/bn/bn_nist.c @@ -68,17 +68,32 @@ /* pre-computed tables are "carry-less" values of modulus*(i+1) */ #if BN_BITS2 == 64 +__fips_constseg static const BN_ULONG _nist_p_192[][BN_NIST_192_TOP] = { {0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFEULL,0xFFFFFFFFFFFFFFFFULL}, {0xFFFFFFFFFFFFFFFEULL,0xFFFFFFFFFFFFFFFDULL,0xFFFFFFFFFFFFFFFFULL}, {0xFFFFFFFFFFFFFFFDULL,0xFFFFFFFFFFFFFFFCULL,0xFFFFFFFFFFFFFFFFULL} }; +__fips_constseg +static const BN_ULONG _nist_p_192_sqr[] = { + 0x0000000000000001ULL,0x0000000000000002ULL,0x0000000000000001ULL, + 0xFFFFFFFFFFFFFFFEULL,0xFFFFFFFFFFFFFFFDULL,0xFFFFFFFFFFFFFFFFULL + }; +__fips_constseg static const BN_ULONG _nist_p_224[][BN_NIST_224_TOP] = { {0x0000000000000001ULL,0xFFFFFFFF00000000ULL, 0xFFFFFFFFFFFFFFFFULL,0x00000000FFFFFFFFULL}, {0x0000000000000002ULL,0xFFFFFFFE00000000ULL, 0xFFFFFFFFFFFFFFFFULL,0x00000001FFFFFFFFULL} /* this one is "carry-full" */ }; +__fips_constseg +static const BN_ULONG _nist_p_224_sqr[] = { + 0x0000000000000001ULL,0xFFFFFFFE00000000ULL, + 0xFFFFFFFFFFFFFFFFULL,0x0000000200000000ULL, + 0x0000000000000000ULL,0xFFFFFFFFFFFFFFFEULL, + 0xFFFFFFFFFFFFFFFFULL + }; +__fips_constseg static const BN_ULONG _nist_p_256[][BN_NIST_256_TOP] = { {0xFFFFFFFFFFFFFFFFULL,0x00000000FFFFFFFFULL, 0x0000000000000000ULL,0xFFFFFFFF00000001ULL}, @@ -91,6 +106,14 @@ static const BN_ULONG _nist_p_256[][BN_NIST_256_TOP] = { {0xFFFFFFFFFFFFFFFBULL,0x00000004FFFFFFFFULL, 0x0000000000000000ULL,0xFFFFFFFB00000005ULL}, }; +__fips_constseg +static const BN_ULONG _nist_p_256_sqr[] = { + 0x0000000000000001ULL,0xFFFFFFFE00000000ULL, + 0xFFFFFFFFFFFFFFFFULL,0x00000001FFFFFFFEULL, + 0x00000001FFFFFFFEULL,0x00000001FFFFFFFEULL, + 0xFFFFFFFE00000001ULL,0xFFFFFFFE00000002ULL + }; +__fips_constseg static const BN_ULONG _nist_p_384[][BN_NIST_384_TOP] = { {0x00000000FFFFFFFFULL,0xFFFFFFFF00000000ULL,0xFFFFFFFFFFFFFFFEULL, 0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL}, @@ -103,24 +126,56 @@ static const BN_ULONG _nist_p_384[][BN_NIST_384_TOP] = { {0x00000004FFFFFFFBULL,0xFFFFFFFB00000000ULL,0xFFFFFFFFFFFFFFFAULL, 0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL}, }; +__fips_constseg +static const BN_ULONG _nist_p_384_sqr[] = { + 0xFFFFFFFE00000001ULL,0x0000000200000000ULL,0xFFFFFFFE00000000ULL, + 0x0000000200000000ULL,0x0000000000000001ULL,0x0000000000000000ULL, + 0x00000001FFFFFFFEULL,0xFFFFFFFE00000000ULL,0xFFFFFFFFFFFFFFFDULL, + 0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL + }; +__fips_constseg static const BN_ULONG _nist_p_521[] = {0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL, 0x00000000000001FFULL}; +__fips_constseg +static const BN_ULONG _nist_p_521_sqr[] = { + 0x0000000000000001ULL,0x0000000000000000ULL,0x0000000000000000ULL, + 0x0000000000000000ULL,0x0000000000000000ULL,0x0000000000000000ULL, + 0x0000000000000000ULL,0x0000000000000000ULL,0xFFFFFFFFFFFFFC00ULL, + 0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL, + 0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL, + 0xFFFFFFFFFFFFFFFFULL,0x000000000003FFFFULL + }; #elif BN_BITS2 == 32 +__fips_constseg static const BN_ULONG _nist_p_192[][BN_NIST_192_TOP] = { {0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFE,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF}, {0xFFFFFFFE,0xFFFFFFFF,0xFFFFFFFD,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF}, {0xFFFFFFFD,0xFFFFFFFF,0xFFFFFFFC,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF} }; +__fips_constseg +static const BN_ULONG _nist_p_192_sqr[] = { + 0x00000001,0x00000000,0x00000002,0x00000000,0x00000001,0x00000000, + 0xFFFFFFFE,0xFFFFFFFF,0xFFFFFFFD,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF + }; +__fips_constseg static const BN_ULONG _nist_p_224[][BN_NIST_224_TOP] = { {0x00000001,0x00000000,0x00000000,0xFFFFFFFF, 0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF}, {0x00000002,0x00000000,0x00000000,0xFFFFFFFE, 0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF} }; +__fips_constseg +static const BN_ULONG _nist_p_224_sqr[] = { + 0x00000001,0x00000000,0x00000000,0xFFFFFFFE, + 0xFFFFFFFF,0xFFFFFFFF,0x00000000,0x00000002, + 0x00000000,0x00000000,0xFFFFFFFE,0xFFFFFFFF, + 0xFFFFFFFF,0xFFFFFFFF + }; +__fips_constseg static const BN_ULONG _nist_p_256[][BN_NIST_256_TOP] = { {0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0x00000000, 0x00000000,0x00000000,0x00000001,0xFFFFFFFF}, @@ -133,6 +188,14 @@ static const BN_ULONG _nist_p_256[][BN_NIST_256_TOP] = { {0xFFFFFFFB,0xFFFFFFFF,0xFFFFFFFF,0x00000004, 0x00000000,0x00000000,0x00000005,0xFFFFFFFB}, }; +__fips_constseg +static const BN_ULONG _nist_p_256_sqr[] = { + 0x00000001,0x00000000,0x00000000,0xFFFFFFFE, + 0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFE,0x00000001, + 0xFFFFFFFE,0x00000001,0xFFFFFFFE,0x00000001, + 0x00000001,0xFFFFFFFE,0x00000002,0xFFFFFFFE + }; +__fips_constseg static const BN_ULONG _nist_p_384[][BN_NIST_384_TOP] = { {0xFFFFFFFF,0x00000000,0x00000000,0xFFFFFFFF,0xFFFFFFFE,0xFFFFFFFF, 0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF}, @@ -145,10 +208,27 @@ static const BN_ULONG _nist_p_384[][BN_NIST_384_TOP] = { {0xFFFFFFFB,0x00000004,0x00000000,0xFFFFFFFB,0xFFFFFFFA,0xFFFFFFFF, 0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF}, }; +__fips_constseg +static const BN_ULONG _nist_p_384_sqr[] = { + 0x00000001,0xFFFFFFFE,0x00000000,0x00000002,0x00000000,0xFFFFFFFE, + 0x00000000,0x00000002,0x00000001,0x00000000,0x00000000,0x00000000, + 0xFFFFFFFE,0x00000001,0x00000000,0xFFFFFFFE,0xFFFFFFFD,0xFFFFFFFF, + 0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF + }; +__fips_constseg static const BN_ULONG _nist_p_521[] = {0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF, 0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF, 0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF, 0xFFFFFFFF,0x000001FF}; +__fips_constseg +static const BN_ULONG _nist_p_521_sqr[] = { + 0x00000001,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000, + 0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000, + 0x00000000,0x00000000,0x00000000,0x00000000,0xFFFFFC00,0xFFFFFFFF, + 0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF, + 0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF, + 0xFFFFFFFF,0xFFFFFFFF,0x0003FFFF + }; #else #error "unsupported BN_BITS2" #endif @@ -226,24 +306,25 @@ 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); - for (i = (top); i != 0; i--) - *_tmp1++ = *_tmp2++; - for (i = (max) - (top); i != 0; i--) - *_tmp1++ = (BN_ULONG) 0; +#endif + 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 @@ -257,6 +338,13 @@ static void nist_cp_bn(BN_ULONG *buf, BN_ULONG *a, int top) :(to[(n)/2] =((m)&1)?(from[(m)/2]>>32):(from[(m)/2]&BN_MASK2l))) #define bn_32_set_0(to, n) (((n)&1)?(to[(n)/2]&=BN_MASK2l):(to[(n)/2]=0)); #define bn_cp_32(to,n,from,m) ((m)>=0)?bn_cp_32_naked(to,n,from,m):bn_32_set_0(to,n) +# if defined(L_ENDIAN) +# if defined(__arch64__) +# define NIST_INT64 long +# else +# define NIST_INT64 long long +# endif +# endif #else #define bn_cp_64(to, n, from, m) \ { \ @@ -268,13 +356,15 @@ static void nist_cp_bn(BN_ULONG *buf, BN_ULONG *a, int top) bn_32_set_0(to, (n)*2); \ bn_32_set_0(to, (n)*2+1); \ } -#if BN_BITS2 == 32 #define bn_cp_32(to, n, from, m) (to)[n] = (m>=0)?((from)[m]):0; #define bn_32_set_0(to, n) (to)[n] = (BN_ULONG)0; -#endif +# if defined(_WIN32) && !defined(__GNUC__) +# define NIST_INT64 __int64 +# elif defined(BN_LLONG) +# define NIST_INT64 long long +# endif #endif /* BN_BITS2 != 64 */ - #define nist_set_192(to, from, a1, a2, a3) \ { \ bn_cp_64(to, 0, from, (a3) - 3) \ @@ -288,16 +378,23 @@ int BN_nist_mod_192(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, 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], - c_d[BN_NIST_192_TOP], + union { + BN_ULONG bn[BN_NIST_192_TOP]; + unsigned int ui[BN_NIST_192_TOP*sizeof(BN_ULONG)/sizeof(unsigned int)]; + } buf; + BN_ULONG c_d[BN_NIST_192_TOP], *res; - size_t mask; + PTR_SIZE_INT mask; + static const BIGNUM _bignum_nist_p_192_sqr = { + (BN_ULONG *)_nist_p_192_sqr, + sizeof(_nist_p_192_sqr)/sizeof(_nist_p_192_sqr[0]), + sizeof(_nist_p_192_sqr)/sizeof(_nist_p_192_sqr[0]), + 0,BN_FLG_STATIC_DATA }; 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); + if (BN_is_negative(a) || BN_ucmp(a,&_bignum_nist_p_192_sqr)>=0) + return BN_nnmod(r, a, field, ctx); i = BN_ucmp(field, a); if (i == 0) @@ -318,17 +415,50 @@ int BN_nist_mod_192(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, else r_d = a_d; - nist_cp_bn_0(buf, a_d + BN_NIST_192_TOP, top - BN_NIST_192_TOP, BN_NIST_192_TOP); + nist_cp_bn_0(buf.bn, a_d + BN_NIST_192_TOP, top - BN_NIST_192_TOP, BN_NIST_192_TOP); + +#if defined(NIST_INT64) + { + NIST_INT64 acc; /* accumulator */ + unsigned int *rp=(unsigned int *)r_d; + const unsigned int *bp=(const unsigned int *)buf.ui; + + acc = rp[0]; acc += bp[3*2-6]; + acc += bp[5*2-6]; rp[0] = (unsigned int)acc; acc >>= 32; + + acc += rp[1]; acc += bp[3*2-5]; + acc += bp[5*2-5]; rp[1] = (unsigned int)acc; acc >>= 32; - nist_set_192(t_d, buf, 0, 3, 3); - carry = bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP); - nist_set_192(t_d, buf, 4, 4, 0); - carry += bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP); - nist_set_192(t_d, buf, 5, 5, 5) - carry += bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP); + acc += rp[2]; acc += bp[3*2-6]; + acc += bp[4*2-6]; + acc += bp[5*2-6]; rp[2] = (unsigned int)acc; acc >>= 32; + acc += rp[3]; acc += bp[3*2-5]; + acc += bp[4*2-5]; + acc += bp[5*2-5]; rp[3] = (unsigned int)acc; acc >>= 32; + + acc += rp[4]; acc += bp[4*2-6]; + acc += bp[5*2-6]; rp[4] = (unsigned int)acc; acc >>= 32; + + acc += rp[5]; acc += bp[4*2-5]; + acc += bp[5*2-5]; rp[5] = (unsigned int)acc; + + carry = (int)(acc>>32); + } +#else + { + BN_ULONG t_d[BN_NIST_192_TOP]; + + nist_set_192(t_d, buf.bn, 0, 3, 3); + carry = (int)bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP); + nist_set_192(t_d, buf.bn, 4, 4, 0); + carry += (int)bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP); + nist_set_192(t_d, buf.bn, 5, 5, 5) + carry += (int)bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP); + } +#endif if (carry > 0) - carry = bn_sub_words(r_d,r_d,_nist_p_192[carry-1],BN_NIST_192_TOP); + carry = (int)bn_sub_words(r_d,r_d,_nist_p_192[carry-1],BN_NIST_192_TOP); else carry = 1; @@ -338,18 +468,15 @@ int BN_nist_mod_192(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, * 'tmp=result-modulus; if (!carry || !borrow) result=tmp;' * this is what happens below, but without explicit if:-) a. */ - mask = 0-(size_t)bn_sub_words(c_d,r_d,_nist_p_192[0],BN_NIST_192_TOP); - mask &= 0-(size_t)carry; - res = (BN_ULONG *)(((size_t)c_d&~mask) | ((size_t)r_d&mask)); + 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)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); - if (BN_ucmp(field, r) <= 0) - { - if (!BN_usub(r, r, field)) return 0; - } - return 1; } @@ -372,17 +499,25 @@ 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 t_d[BN_NIST_224_TOP], - 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; - size_t mask; - union { bn_addsub_f f; size_t p; } u; + PTR_SIZE_INT mask; + union { bn_addsub_f f; PTR_SIZE_INT p; } u; + static const BIGNUM _bignum_nist_p_224_sqr = { + (BN_ULONG *)_nist_p_224_sqr, + sizeof(_nist_p_224_sqr)/sizeof(_nist_p_224_sqr[0]), + sizeof(_nist_p_224_sqr)/sizeof(_nist_p_224_sqr[0]), + 0,BN_FLG_STATIC_DATA }; + 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); + if (BN_is_negative(a) || BN_ucmp(a,&_bignum_nist_p_224_sqr)>=0) + return BN_nnmod(r, a, field, ctx); i = BN_ucmp(field, a); if (i == 0) @@ -405,30 +540,72 @@ int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, #if BN_BITS2==64 /* copy upper 256 bits of 448 bit number ... */ - nist_cp_bn_0(t_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 */ - nist_set_224(buf, t_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 - nist_set_224(t_d, buf, 10, 9, 8, 7, 0, 0, 0); - carry = 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); - carry += 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); - carry -= 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); - carry -= bn_sub_words(r_d, r_d, t_d, BN_NIST_224_TOP); + +#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.ui; + + acc = rp[0]; acc -= bp[7-7]; + acc -= bp[11-7]; rp[0] = (unsigned int)acc; acc >>= 32; + + acc += rp[1]; acc -= bp[8-7]; + acc -= bp[12-7]; rp[1] = (unsigned int)acc; acc >>= 32; + + acc += rp[2]; acc -= bp[9-7]; + acc -= bp[13-7]; rp[2] = (unsigned int)acc; acc >>= 32; + + acc += rp[3]; acc += bp[7-7]; + acc += bp[11-7]; + acc -= bp[10-7]; rp[3] = (unsigned int)acc; acc>>= 32; + + acc += rp[4]; acc += bp[8-7]; + acc += bp[12-7]; + acc -= bp[11-7]; rp[4] = (unsigned int)acc; acc >>= 32; + + acc += rp[5]; acc += bp[9-7]; + acc += bp[13-7]; + acc -= bp[12-7]; rp[5] = (unsigned int)acc; acc >>= 32; + + acc += rp[6]; acc += bp[10-7]; + acc -= bp[13-7]; rp[6] = (unsigned int)acc; + + carry = (int)(acc>>32); +# if BN_BITS2==64 + rp[7] = carry; +# endif + } +#else + { + BN_ULONG t_d[BN_NIST_224_TOP]; + + 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.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.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.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 carry = (int)(r_d[BN_NIST_224_TOP-1]>>32); +#endif + } #endif u.f = bn_sub_words; if (carry > 0) { - carry = bn_sub_words(r_d,r_d,_nist_p_224[carry-1],BN_NIST_224_TOP); + carry = (int)bn_sub_words(r_d,r_d,_nist_p_224[carry-1],BN_NIST_224_TOP); #if BN_BITS2==64 carry=(int)(~(r_d[BN_NIST_224_TOP-1]>>32))&1; #endif @@ -441,26 +618,24 @@ int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, * the modulus. but if it does, then result has * to be compared to the modulus and conditionally * adjusted by *subtracting* the latter. */ - carry = bn_add_words(r_d,r_d,_nist_p_224[-carry-1],BN_NIST_224_TOP); - mask = 0-(size_t)carry; - u.p = ((size_t)bn_sub_words&mask) | ((size_t)bn_add_words&~mask); + carry = (int)bn_add_words(r_d,r_d,_nist_p_224[-carry-1],BN_NIST_224_TOP); + mask = 0-(PTR_SIZE_INT)carry; + u.p = ((PTR_SIZE_INT)bn_sub_words&mask) | + ((PTR_SIZE_INT)bn_add_words&~mask); } else carry = 1; /* otherwise it's effectively same as in BN_nist_mod_192... */ - mask = 0-(size_t)(*u.f)(c_d,r_d,_nist_p_224[0],BN_NIST_224_TOP); - mask &= 0-(size_t)carry; - res = (BN_ULONG *)(((size_t)c_d&~mask) | ((size_t)r_d&mask)); + 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 = 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; bn_correct_top(r); - if (BN_ucmp(field, r) <= 0) - { - if (!BN_usub(r, r, field)) return 0; - } - return 1; } @@ -482,17 +657,24 @@ int BN_nist_mod_256(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, int i, top = a->top; int carry = 0; register BN_ULONG *a_d = a->d, *r_d; - BN_ULONG t_d[BN_NIST_256_TOP], - buf[BN_NIST_256_TOP], - c_d[BN_NIST_256_TOP], + union { + BN_ULONG bn[BN_NIST_256_TOP]; + unsigned int ui[BN_NIST_256_TOP*sizeof(BN_ULONG)/sizeof(unsigned int)]; + } buf; + BN_ULONG c_d[BN_NIST_256_TOP], *res; - size_t mask; - union { bn_addsub_f f; size_t p; } u; + PTR_SIZE_INT mask; + union { bn_addsub_f f; PTR_SIZE_INT p; } u; + static const BIGNUM _bignum_nist_p_256_sqr = { + (BN_ULONG *)_nist_p_256_sqr, + sizeof(_nist_p_256_sqr)/sizeof(_nist_p_256_sqr[0]), + sizeof(_nist_p_256_sqr)/sizeof(_nist_p_256_sqr[0]), + 0,BN_FLG_STATIC_DATA }; 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); + if (BN_is_negative(a) || BN_ucmp(a,&_bignum_nist_p_256_sqr)>=0) + return BN_nnmod(r, a, field, ctx); i = BN_ucmp(field, a); if (i == 0) @@ -513,13 +695,88 @@ int BN_nist_mod_256(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, else r_d = a_d; - nist_cp_bn_0(buf, a_d + BN_NIST_256_TOP, top - BN_NIST_256_TOP, BN_NIST_256_TOP); + nist_cp_bn_0(buf.bn, a_d + BN_NIST_256_TOP, top - BN_NIST_256_TOP, BN_NIST_256_TOP); + +#if defined(NIST_INT64) + { + NIST_INT64 acc; /* accumulator */ + unsigned int *rp=(unsigned int *)r_d; + const unsigned int *bp=(const unsigned int *)buf.ui; + + acc = rp[0]; acc += bp[8-8]; + acc += bp[9-8]; + acc -= bp[11-8]; + acc -= bp[12-8]; + acc -= bp[13-8]; + acc -= bp[14-8]; rp[0] = (unsigned int)acc; acc >>= 32; + + acc += rp[1]; acc += bp[9-8]; + acc += bp[10-8]; + acc -= bp[12-8]; + acc -= bp[13-8]; + acc -= bp[14-8]; + acc -= bp[15-8]; rp[1] = (unsigned int)acc; acc >>= 32; + + acc += rp[2]; acc += bp[10-8]; + acc += bp[11-8]; + acc -= bp[13-8]; + acc -= bp[14-8]; + acc -= bp[15-8]; rp[2] = (unsigned int)acc; acc >>= 32; + + acc += rp[3]; acc += bp[11-8]; + acc += bp[11-8]; + acc += bp[12-8]; + acc += bp[12-8]; + acc += bp[13-8]; + acc -= bp[15-8]; + acc -= bp[8-8]; + acc -= bp[9-8]; rp[3] = (unsigned int)acc; acc >>= 32; + + acc += rp[4]; acc += bp[12-8]; + acc += bp[12-8]; + acc += bp[13-8]; + acc += bp[13-8]; + acc += bp[14-8]; + acc -= bp[9-8]; + acc -= bp[10-8]; rp[4] = (unsigned int)acc; acc >>= 32; + + acc += rp[5]; acc += bp[13-8]; + acc += bp[13-8]; + acc += bp[14-8]; + acc += bp[14-8]; + acc += bp[15-8]; + acc -= bp[10-8]; + acc -= bp[11-8]; rp[5] = (unsigned int)acc; acc >>= 32; + + acc += rp[6]; acc += bp[14-8]; + acc += bp[14-8]; + acc += bp[15-8]; + acc += bp[15-8]; + acc += bp[14-8]; + acc += bp[13-8]; + acc -= bp[8-8]; + acc -= bp[9-8]; rp[6] = (unsigned int)acc; acc >>= 32; + + acc += rp[7]; acc += bp[15-8]; + acc += bp[15-8]; + acc += bp[15-8]; + acc += bp[8 -8]; + acc -= bp[10-8]; + acc -= bp[11-8]; + acc -= bp[12-8]; + acc -= bp[13-8]; rp[7] = (unsigned int)acc; + + carry = (int)(acc>>32); + } +#else + { + BN_ULONG t_d[BN_NIST_256_TOP]; /*S1*/ - nist_set_256(t_d, buf, 15, 14, 13, 12, 11, 0, 0, 0); + nist_set_256(t_d, buf.bn, 15, 14, 13, 12, 11, 0, 0, 0); /*S2*/ - 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); + nist_set_256(c_d, buf.bn, 0, 15, 14, 13, 12, 0, 0, 0); + carry = (int)bn_add_words(t_d, t_d, c_d, BN_NIST_256_TOP); /* left shift */ { register BN_ULONG *ap,t,c; @@ -534,51 +791,51 @@ int BN_nist_mod_256(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, carry <<= 1; carry |= c; } - carry += bn_add_words(r_d, r_d, t_d, BN_NIST_256_TOP); + carry += (int)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); + nist_set_256(t_d, buf.bn, 15, 14, 0, 0, 0, 10, 9, 8); + carry += (int)bn_add_words(r_d, r_d, t_d, BN_NIST_256_TOP); /*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); + nist_set_256(t_d, buf.bn, 8, 13, 15, 14, 13, 11, 10, 9); + carry += (int)bn_add_words(r_d, r_d, t_d, BN_NIST_256_TOP); /*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); + nist_set_256(t_d, buf.bn, 10, 8, 0, 0, 0, 13, 12, 11); + carry -= (int)bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP); /*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); + nist_set_256(t_d, buf.bn, 11, 9, 0, 0, 15, 14, 13, 12); + carry -= (int)bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP); /*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); + nist_set_256(t_d, buf.bn, 12, 0, 10, 9, 8, 15, 14, 13); + carry -= (int)bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP); /*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); + nist_set_256(t_d, buf.bn, 13, 0, 11, 10, 9, 0, 15, 14); + carry -= (int)bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP); + } +#endif /* see BN_nist_mod_224 for explanation */ u.f = bn_sub_words; if (carry > 0) - carry = bn_sub_words(r_d,r_d,_nist_p_256[carry-1],BN_NIST_256_TOP); + carry = (int)bn_sub_words(r_d,r_d,_nist_p_256[carry-1],BN_NIST_256_TOP); else if (carry < 0) { - carry = bn_add_words(r_d,r_d,_nist_p_256[-carry-1],BN_NIST_256_TOP); - mask = 0-(size_t)carry; - u.p = ((size_t)bn_sub_words&mask) | ((size_t)bn_add_words&~mask); + carry = (int)bn_add_words(r_d,r_d,_nist_p_256[-carry-1],BN_NIST_256_TOP); + mask = 0-(PTR_SIZE_INT)carry; + u.p = ((PTR_SIZE_INT)bn_sub_words&mask) | + ((PTR_SIZE_INT)bn_add_words&~mask); } else carry = 1; - mask = 0-(size_t)(*u.f)(c_d,r_d,_nist_p_256[0],BN_NIST_256_TOP); - mask &= 0-(size_t)carry; - res = (BN_ULONG *)(((size_t)c_d&~mask) | ((size_t)r_d&mask)); + 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 = 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; bn_correct_top(r); - if (BN_ucmp(field, r) <= 0) - { - if (!BN_usub(r, r, field)) return 0; - } - return 1; } @@ -604,17 +861,25 @@ int BN_nist_mod_384(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, int i, top = a->top; int carry = 0; register BN_ULONG *r_d, *a_d = a->d; - BN_ULONG t_d[BN_NIST_384_TOP], - buf[BN_NIST_384_TOP], - c_d[BN_NIST_384_TOP], + union { + BN_ULONG bn[BN_NIST_384_TOP]; + unsigned int ui[BN_NIST_384_TOP*sizeof(BN_ULONG)/sizeof(unsigned int)]; + } buf; + BN_ULONG c_d[BN_NIST_384_TOP], *res; - size_t mask; - union { bn_addsub_f f; size_t p; } u; + PTR_SIZE_INT mask; + union { bn_addsub_f f; PTR_SIZE_INT p; } u; + static const BIGNUM _bignum_nist_p_384_sqr = { + (BN_ULONG *)_nist_p_384_sqr, + sizeof(_nist_p_384_sqr)/sizeof(_nist_p_384_sqr[0]), + sizeof(_nist_p_384_sqr)/sizeof(_nist_p_384_sqr[0]), + 0,BN_FLG_STATIC_DATA }; + 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); + if (BN_is_negative(a) || BN_ucmp(a,&_bignum_nist_p_384_sqr)>=0) + return BN_nnmod(r, a, field, ctx); i = BN_ucmp(field, a); if (i == 0) @@ -635,10 +900,100 @@ int BN_nist_mod_384(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, else r_d = a_d; - nist_cp_bn_0(buf, a_d + BN_NIST_384_TOP, top - BN_NIST_384_TOP, BN_NIST_384_TOP); + nist_cp_bn_0(buf.bn, a_d + BN_NIST_384_TOP, top - BN_NIST_384_TOP, BN_NIST_384_TOP); + +#if defined(NIST_INT64) + { + NIST_INT64 acc; /* accumulator */ + unsigned int *rp=(unsigned int *)r_d; + const unsigned int *bp=(const unsigned int *)buf.ui; + + acc = rp[0]; acc += bp[12-12]; + acc += bp[21-12]; + acc += bp[20-12]; + acc -= bp[23-12]; rp[0] = (unsigned int)acc; acc >>= 32; + + acc += rp[1]; acc += bp[13-12]; + acc += bp[22-12]; + acc += bp[23-12]; + acc -= bp[12-12]; + acc -= bp[20-12]; rp[1] = (unsigned int)acc; acc >>= 32; + + acc += rp[2]; acc += bp[14-12]; + acc += bp[23-12]; + acc -= bp[13-12]; + acc -= bp[21-12]; rp[2] = (unsigned int)acc; acc >>= 32; + + acc += rp[3]; acc += bp[15-12]; + acc += bp[12-12]; + acc += bp[20-12]; + acc += bp[21-12]; + acc -= bp[14-12]; + acc -= bp[22-12]; + acc -= bp[23-12]; rp[3] = (unsigned int)acc; acc >>= 32; + + acc += rp[4]; acc += bp[21-12]; + acc += bp[21-12]; + acc += bp[16-12]; + acc += bp[13-12]; + acc += bp[12-12]; + acc += bp[20-12]; + acc += bp[22-12]; + acc -= bp[15-12]; + acc -= bp[23-12]; + acc -= bp[23-12]; rp[4] = (unsigned int)acc; acc >>= 32; + + acc += rp[5]; acc += bp[22-12]; + acc += bp[22-12]; + acc += bp[17-12]; + acc += bp[14-12]; + acc += bp[13-12]; + acc += bp[21-12]; + acc += bp[23-12]; + acc -= bp[16-12]; rp[5] = (unsigned int)acc; acc >>= 32; + + acc += rp[6]; acc += bp[23-12]; + acc += bp[23-12]; + acc += bp[18-12]; + acc += bp[15-12]; + acc += bp[14-12]; + acc += bp[22-12]; + acc -= bp[17-12]; rp[6] = (unsigned int)acc; acc >>= 32; + + acc += rp[7]; acc += bp[19-12]; + acc += bp[16-12]; + acc += bp[15-12]; + acc += bp[23-12]; + acc -= bp[18-12]; rp[7] = (unsigned int)acc; acc >>= 32; + + acc += rp[8]; acc += bp[20-12]; + acc += bp[17-12]; + acc += bp[16-12]; + acc -= bp[19-12]; rp[8] = (unsigned int)acc; acc >>= 32; + + acc += rp[9]; acc += bp[21-12]; + acc += bp[18-12]; + acc += bp[17-12]; + acc -= bp[20-12]; rp[9] = (unsigned int)acc; acc >>= 32; + + acc += rp[10]; acc += bp[22-12]; + acc += bp[19-12]; + acc += bp[18-12]; + acc -= bp[21-12]; rp[10] = (unsigned int)acc; acc >>= 32; + + acc += rp[11]; acc += bp[23-12]; + acc += bp[20-12]; + acc += bp[19-12]; + acc -= bp[22-12]; rp[11] = (unsigned int)acc; + + carry = (int)(acc>>32); + } +#else + { + BN_ULONG t_d[BN_NIST_384_TOP]; /*S1*/ - nist_set_256(t_d, buf, 0, 0, 0, 0, 0, 23-4, 22-4, 21-4); + nist_set_256(t_d, buf.bn, 0, 0, 0, 0, 0, 23-4, 22-4, 21-4); /* left shift */ { register BN_ULONG *ap,t,c; @@ -652,128 +1007,149 @@ int BN_nist_mod_384(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, } *ap=c; } - carry = bn_add_words(r_d+(128/BN_BITS2), r_d+(128/BN_BITS2), + carry = (int)bn_add_words(r_d+(128/BN_BITS2), r_d+(128/BN_BITS2), t_d, BN_NIST_256_TOP); /*S2 */ - carry += bn_add_words(r_d, r_d, buf, BN_NIST_384_TOP); + carry += (int)bn_add_words(r_d, r_d, buf.bn, BN_NIST_384_TOP); /*S3*/ - nist_set_384(t_d,buf,20,19,18,17,16,15,14,13,12,23,22,21); - carry += bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP); + nist_set_384(t_d,buf.bn,20,19,18,17,16,15,14,13,12,23,22,21); + carry += (int)bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP); /*S4*/ - nist_set_384(t_d,buf,19,18,17,16,15,14,13,12,20,0,23,0); - carry += bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP); + nist_set_384(t_d,buf.bn,19,18,17,16,15,14,13,12,20,0,23,0); + carry += (int)bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP); /*S5*/ - nist_set_384(t_d, buf,0,0,0,0,23,22,21,20,0,0,0,0); - carry += bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP); + nist_set_384(t_d, buf.bn,0,0,0,0,23,22,21,20,0,0,0,0); + carry += (int)bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP); /*S6*/ - nist_set_384(t_d,buf,0,0,0,0,0,0,23,22,21,0,0,20); - carry += bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP); + nist_set_384(t_d,buf.bn,0,0,0,0,0,0,23,22,21,0,0,20); + carry += (int)bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP); /*D1*/ - nist_set_384(t_d,buf,22,21,20,19,18,17,16,15,14,13,12,23); - carry -= bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP); + nist_set_384(t_d,buf.bn,22,21,20,19,18,17,16,15,14,13,12,23); + carry -= (int)bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP); /*D2*/ - nist_set_384(t_d,buf,0,0,0,0,0,0,0,23,22,21,20,0); - carry -= bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP); + nist_set_384(t_d,buf.bn,0,0,0,0,0,0,0,23,22,21,20,0); + carry -= (int)bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP); /*D3*/ - nist_set_384(t_d,buf,0,0,0,0,0,0,0,23,23,0,0,0); - carry -= bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP); + nist_set_384(t_d,buf.bn,0,0,0,0,0,0,0,23,23,0,0,0); + carry -= (int)bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP); + } +#endif /* see BN_nist_mod_224 for explanation */ u.f = bn_sub_words; if (carry > 0) - carry = bn_sub_words(r_d,r_d,_nist_p_384[carry-1],BN_NIST_384_TOP); + carry = (int)bn_sub_words(r_d,r_d,_nist_p_384[carry-1],BN_NIST_384_TOP); else if (carry < 0) { - carry = bn_add_words(r_d,r_d,_nist_p_384[-carry-1],BN_NIST_384_TOP); - mask = 0-(size_t)carry; - u.p = ((size_t)bn_sub_words&mask) | ((size_t)bn_add_words&~mask); + carry = (int)bn_add_words(r_d,r_d,_nist_p_384[-carry-1],BN_NIST_384_TOP); + mask = 0-(PTR_SIZE_INT)carry; + u.p = ((PTR_SIZE_INT)bn_sub_words&mask) | + ((PTR_SIZE_INT)bn_add_words&~mask); } else carry = 1; - mask = 0-(size_t)(*u.f)(c_d,r_d,_nist_p_384[0],BN_NIST_384_TOP); - mask &= 0-(size_t)carry; - res = (BN_ULONG *)(((size_t)c_d&~mask) | ((size_t)r_d&mask)); + 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 = 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; bn_correct_top(r); - if (BN_ucmp(field, r) <= 0) - { - if (!BN_usub(r, r, field)) return 0; - } - return 1; } +#define BN_NIST_521_RSHIFT (521%BN_BITS2) +#define BN_NIST_521_LSHIFT (BN_BITS2-BN_NIST_521_RSHIFT) +#define BN_NIST_521_TOP_MASK ((BN_ULONG)BN_MASK2>>BN_NIST_521_LSHIFT) + int BN_nist_mod_521(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, BN_CTX *ctx) { -#if BN_BITS2 == 64 -#define BN_NIST_521_TOP_MASK (BN_ULONG)0x1FF -#elif BN_BITS2 == 32 -#define BN_NIST_521_TOP_MASK (BN_ULONG)0x1FF -#endif - int top, ret = 0; - BN_ULONG *r_d; - BIGNUM *tmp; + int top = a->top, i; + BN_ULONG *r_d, *a_d = a->d, + t_d[BN_NIST_521_TOP], + val,tmp,*res; + PTR_SIZE_INT mask; + static const BIGNUM _bignum_nist_p_521_sqr = { + (BN_ULONG *)_nist_p_521_sqr, + sizeof(_nist_p_521_sqr)/sizeof(_nist_p_521_sqr[0]), + sizeof(_nist_p_521_sqr)/sizeof(_nist_p_521_sqr[0]), + 0,BN_FLG_STATIC_DATA }; field = &_bignum_nist_p_521; /* just to make sure */ - if (BN_is_negative(a)) - return BN_nnmod(r, field, a, ctx); + if (BN_is_negative(a) || BN_ucmp(a,&_bignum_nist_p_521_sqr)>=0) + return BN_nnmod(r, a, field, 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))))) + i = BN_ucmp(field, a); + if (i == 0) { - 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); - } + BN_zero(r); + return 1; } + else if (i > 0) + 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 (!tmp) - goto err; - - if (!bn_wexpand(tmp, BN_NIST_521_TOP)) - goto err; - nist_cp_bn(tmp->d, a->d, BN_NIST_521_TOP); - - tmp->top = BN_NIST_521_TOP; - tmp->d[BN_NIST_521_TOP-1] &= BN_NIST_521_TOP_MASK; - bn_correct_top(tmp); - - if (!BN_rshift(r, a, 521)) - goto err; - - if (!BN_uadd(r, tmp, r)) - goto err; + if (r != a) + { + if (!bn_wexpand(r,BN_NIST_521_TOP)) + return 0; + r_d = r->d; + nist_cp_bn(r_d,a_d, BN_NIST_521_TOP); + } + else + r_d = a_d; - if (BN_ucmp(field, r) <= 0) + /* upper 521 bits, copy ... */ + nist_cp_bn_0(t_d,a_d + (BN_NIST_521_TOP-1), top - (BN_NIST_521_TOP-1),BN_NIST_521_TOP); + /* ... and right shift */ + for (val=t_d[0],i=0; i>BN_NIST_521_RSHIFT; + val = t_d[i+1]; + t_d[i] = (tmp | val<>BN_NIST_521_RSHIFT | + (tmp=t_d[i+1])<>BN_NIST_521_RSHIFT; + /* lower 521 bits */ + r_d[i] &= BN_NIST_521_TOP_MASK; + + 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 = 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; + bn_correct_top(r); - ret = 1; -err: - BN_CTX_end(ctx); + return 1; + } - bn_check_top(r); - return ret; +int (*BN_nist_mod_func(const BIGNUM *p))(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, BN_CTX *ctx) + { + if (BN_ucmp(&_bignum_nist_p_192, p) == 0) + return BN_nist_mod_192; + if (BN_ucmp(&_bignum_nist_p_224, p) == 0) + return BN_nist_mod_224; + if (BN_ucmp(&_bignum_nist_p_256, p) == 0) + return BN_nist_mod_256; + if (BN_ucmp(&_bignum_nist_p_384, p) == 0) + return BN_nist_mod_384; + if (BN_ucmp(&_bignum_nist_p_521, p) == 0) + return BN_nist_mod_521; + return 0; }