diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/bn/bn_nist.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/bn/bn_nist.c | 1239 |
1 files changed, 1239 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/bn/bn_nist.c b/openssl-1.1.0h/crypto/bn/bn_nist.c new file mode 100644 index 0000000..53598f9 --- /dev/null +++ b/openssl-1.1.0h/crypto/bn/bn_nist.c @@ -0,0 +1,1239 @@ +/* + * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include "bn_lcl.h" +#include "internal/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 +#define BN_NIST_384_TOP (384+BN_BITS2-1)/BN_BITS2 +#define BN_NIST_521_TOP (521+BN_BITS2-1)/BN_BITS2 + +/* pre-computed tables are "carry-less" values of modulus*(i+1) */ +#if BN_BITS2 == 64 +static const BN_ULONG _nist_p_192[][BN_NIST_192_TOP] = { + {0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFEULL, 0xFFFFFFFFFFFFFFFFULL}, + {0xFFFFFFFFFFFFFFFEULL, 0xFFFFFFFFFFFFFFFDULL, 0xFFFFFFFFFFFFFFFFULL}, + {0xFFFFFFFFFFFFFFFDULL, 0xFFFFFFFFFFFFFFFCULL, 0xFFFFFFFFFFFFFFFFULL} +}; + +static const BN_ULONG _nist_p_192_sqr[] = { + 0x0000000000000001ULL, 0x0000000000000002ULL, 0x0000000000000001ULL, + 0xFFFFFFFFFFFFFFFEULL, 0xFFFFFFFFFFFFFFFDULL, 0xFFFFFFFFFFFFFFFFULL +}; + +static const BN_ULONG _nist_p_224[][BN_NIST_224_TOP] = { + {0x0000000000000001ULL, 0xFFFFFFFF00000000ULL, + 0xFFFFFFFFFFFFFFFFULL, 0x00000000FFFFFFFFULL}, + {0x0000000000000002ULL, 0xFFFFFFFE00000000ULL, + 0xFFFFFFFFFFFFFFFFULL, 0x00000001FFFFFFFFULL} /* this one is + * "carry-full" */ +}; + +static const BN_ULONG _nist_p_224_sqr[] = { + 0x0000000000000001ULL, 0xFFFFFFFE00000000ULL, + 0xFFFFFFFFFFFFFFFFULL, 0x0000000200000000ULL, + 0x0000000000000000ULL, 0xFFFFFFFFFFFFFFFEULL, + 0xFFFFFFFFFFFFFFFFULL +}; + +static const BN_ULONG _nist_p_256[][BN_NIST_256_TOP] = { + {0xFFFFFFFFFFFFFFFFULL, 0x00000000FFFFFFFFULL, + 0x0000000000000000ULL, 0xFFFFFFFF00000001ULL}, + {0xFFFFFFFFFFFFFFFEULL, 0x00000001FFFFFFFFULL, + 0x0000000000000000ULL, 0xFFFFFFFE00000002ULL}, + {0xFFFFFFFFFFFFFFFDULL, 0x00000002FFFFFFFFULL, + 0x0000000000000000ULL, 0xFFFFFFFD00000003ULL}, + {0xFFFFFFFFFFFFFFFCULL, 0x00000003FFFFFFFFULL, + 0x0000000000000000ULL, 0xFFFFFFFC00000004ULL}, + {0xFFFFFFFFFFFFFFFBULL, 0x00000004FFFFFFFFULL, + 0x0000000000000000ULL, 0xFFFFFFFB00000005ULL}, +}; + +static const BN_ULONG _nist_p_256_sqr[] = { + 0x0000000000000001ULL, 0xFFFFFFFE00000000ULL, + 0xFFFFFFFFFFFFFFFFULL, 0x00000001FFFFFFFEULL, + 0x00000001FFFFFFFEULL, 0x00000001FFFFFFFEULL, + 0xFFFFFFFE00000001ULL, 0xFFFFFFFE00000002ULL +}; + +static const BN_ULONG _nist_p_384[][BN_NIST_384_TOP] = { + {0x00000000FFFFFFFFULL, 0xFFFFFFFF00000000ULL, 0xFFFFFFFFFFFFFFFEULL, + 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL}, + {0x00000001FFFFFFFEULL, 0xFFFFFFFE00000000ULL, 0xFFFFFFFFFFFFFFFDULL, + 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL}, + {0x00000002FFFFFFFDULL, 0xFFFFFFFD00000000ULL, 0xFFFFFFFFFFFFFFFCULL, + 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL}, + {0x00000003FFFFFFFCULL, 0xFFFFFFFC00000000ULL, 0xFFFFFFFFFFFFFFFBULL, + 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL}, + {0x00000004FFFFFFFBULL, 0xFFFFFFFB00000000ULL, 0xFFFFFFFFFFFFFFFAULL, + 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL}, +}; + +static const BN_ULONG _nist_p_384_sqr[] = { + 0xFFFFFFFE00000001ULL, 0x0000000200000000ULL, 0xFFFFFFFE00000000ULL, + 0x0000000200000000ULL, 0x0000000000000001ULL, 0x0000000000000000ULL, + 0x00000001FFFFFFFEULL, 0xFFFFFFFE00000000ULL, 0xFFFFFFFFFFFFFFFDULL, + 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL +}; + +static const BN_ULONG _nist_p_521[] = + { 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL, + 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL, + 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL, + 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL, + 0x00000000000001FFULL +}; + +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 +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} +}; + +static const BN_ULONG _nist_p_192_sqr[] = { + 0x00000001, 0x00000000, 0x00000002, 0x00000000, 0x00000001, 0x00000000, + 0xFFFFFFFE, 0xFFFFFFFF, 0xFFFFFFFD, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF +}; + +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} +}; + +static const BN_ULONG _nist_p_224_sqr[] = { + 0x00000001, 0x00000000, 0x00000000, 0xFFFFFFFE, + 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000002, + 0x00000000, 0x00000000, 0xFFFFFFFE, 0xFFFFFFFF, + 0xFFFFFFFF, 0xFFFFFFFF +}; + +static const BN_ULONG _nist_p_256[][BN_NIST_256_TOP] = { + {0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, + 0x00000000, 0x00000000, 0x00000001, 0xFFFFFFFF}, + {0xFFFFFFFE, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000001, + 0x00000000, 0x00000000, 0x00000002, 0xFFFFFFFE}, + {0xFFFFFFFD, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000002, + 0x00000000, 0x00000000, 0x00000003, 0xFFFFFFFD}, + {0xFFFFFFFC, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000003, + 0x00000000, 0x00000000, 0x00000004, 0xFFFFFFFC}, + {0xFFFFFFFB, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000004, + 0x00000000, 0x00000000, 0x00000005, 0xFFFFFFFB}, +}; + +static const BN_ULONG _nist_p_256_sqr[] = { + 0x00000001, 0x00000000, 0x00000000, 0xFFFFFFFE, + 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFE, 0x00000001, + 0xFFFFFFFE, 0x00000001, 0xFFFFFFFE, 0x00000001, + 0x00000001, 0xFFFFFFFE, 0x00000002, 0xFFFFFFFE +}; + +static const BN_ULONG _nist_p_384[][BN_NIST_384_TOP] = { + {0xFFFFFFFF, 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFE, 0xFFFFFFFF, + 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF}, + {0xFFFFFFFE, 0x00000001, 0x00000000, 0xFFFFFFFE, 0xFFFFFFFD, 0xFFFFFFFF, + 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF}, + {0xFFFFFFFD, 0x00000002, 0x00000000, 0xFFFFFFFD, 0xFFFFFFFC, 0xFFFFFFFF, + 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF}, + {0xFFFFFFFC, 0x00000003, 0x00000000, 0xFFFFFFFC, 0xFFFFFFFB, 0xFFFFFFFF, + 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF}, + {0xFFFFFFFB, 0x00000004, 0x00000000, 0xFFFFFFFB, 0xFFFFFFFA, 0xFFFFFFFF, + 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF}, +}; + +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 +}; + +static const BN_ULONG _nist_p_521[] = { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, + 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, + 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, + 0xFFFFFFFF, 0x000001FF +}; + +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 + +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) +{ + return &_bignum_nist_p_192; +} + +const BIGNUM *BN_get0_nist_prime_224(void) +{ + return &_bignum_nist_p_224; +} + +const BIGNUM *BN_get0_nist_prime_256(void) +{ + return &_bignum_nist_p_256; +} + +const BIGNUM *BN_get0_nist_prime_384(void) +{ + return &_bignum_nist_p_384; +} + +const BIGNUM *BN_get0_nist_prime_521(void) +{ + return &_bignum_nist_p_521; +} + +static void nist_cp_bn_0(BN_ULONG *dst, const BN_ULONG *src, int top, int max) +{ + int i; + +#ifdef BN_DEBUG + OPENSSL_assert(top <= max); +#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 *dst, const BN_ULONG *src, int top) +{ + int i; + + for (i = 0; i < top; i++) + dst[i] = src[i]; +} + +#if BN_BITS2 == 64 +# define bn_cp_64(to, n, from, m) (to)[n] = (m>=0)?((from)[m]):0; +# define bn_64_set_0(to, n) (to)[n] = (BN_ULONG)0; +/* + * two following macros are implemented under assumption that they + * are called in a sequence with *ascending* n, i.e. as they are... + */ +# define bn_cp_32_naked(to, n, from, m) (((n)&1)?(to[(n)/2]|=((m)&1)?(from[(m)/2]&BN_MASK2h):(from[(m)/2]<<32))\ + :(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) \ + { \ + bn_cp_32(to, (n)*2, from, (m)*2); \ + bn_cp_32(to, (n)*2+1, from, (m)*2+1); \ + } +# define bn_64_set_0(to, n) \ + { \ + bn_32_set_0(to, (n)*2); \ + bn_32_set_0(to, (n)*2+1); \ + } +# 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; +# 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) \ + bn_cp_64(to, 1, from, (a2) - 3) \ + bn_cp_64(to, 2, from, (a1) - 3) \ + } + +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; + 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; + PTR_SIZE_INT mask; + static const BIGNUM _bignum_nist_p_192_sqr = { + (BN_ULONG *)_nist_p_192_sqr, + OSSL_NELEM(_nist_p_192_sqr), + OSSL_NELEM(_nist_p_192_sqr), + 0, BN_FLG_STATIC_DATA + }; + + field = &_bignum_nist_p_192; /* just to make sure */ + + 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) { + BN_zero(r); + return 1; + } else if (i > 0) + return (r == a) ? 1 : (BN_copy(r, a) != NULL); + + if (r != a) { + if (!bn_wexpand(r, BN_NIST_192_TOP)) + return 0; + r_d = r->d; + nist_cp_bn(r_d, a_d, BN_NIST_192_TOP); + } else + r_d = a_d; + + 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; + + 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 = + (int)bn_sub_words(r_d, r_d, _nist_p_192[carry - 1], + BN_NIST_192_TOP); + else + carry = 1; + + /* + * we need 'if (carry==0 || result>=modulus) result-=modulus;' + * as comparison implies subtraction, we can write + * 'tmp=result-modulus; if (!carry || !borrow) result=tmp;' + * this is what happens below, but without explicit if:-) a. + */ + 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); + + return 1; +} + +typedef BN_ULONG (*bn_addsub_f) (BN_ULONG *, const BN_ULONG *, + const BN_ULONG *, int); + +#define nist_set_224(to, from, a1, a2, a3, a4, a5, a6, a7) \ + { \ + bn_cp_32(to, 0, from, (a7) - 7) \ + bn_cp_32(to, 1, from, (a6) - 7) \ + bn_cp_32(to, 2, from, (a5) - 7) \ + bn_cp_32(to, 3, from, (a4) - 7) \ + bn_cp_32(to, 4, from, (a3) - 7) \ + bn_cp_32(to, 5, from, (a2) - 7) \ + bn_cp_32(to, 6, from, (a1) - 7) \ + } + +int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, + BN_CTX *ctx) +{ + int top = a->top, i; + int carry; + BN_ULONG *r_d, *a_d = a->d; + 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; + static const BIGNUM _bignum_nist_p_224_sqr = { + (BN_ULONG *)_nist_p_224_sqr, + OSSL_NELEM(_nist_p_224_sqr), + OSSL_NELEM(_nist_p_224_sqr), + 0, BN_FLG_STATIC_DATA + }; + + field = &_bignum_nist_p_224; /* just to make sure */ + + 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) { + BN_zero(r); + return 1; + } else if (i > 0) + return (r == a) ? 1 : (BN_copy(r, a) != NULL); + + if (r != a) { + if (!bn_wexpand(r, BN_NIST_224_TOP)) + return 0; + r_d = r->d; + nist_cp_bn(r_d, a_d, BN_NIST_224_TOP); + } else + r_d = a_d; + +#if BN_BITS2==64 + /* 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.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.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.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 = + (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 + } else if (carry < 0) { + /* + * it's a bit more complicated logic in this case. if bn_add_words + * yields no carry, then result has to be adjusted by unconditionally + * *adding* the modulus. but if it does, then result has to be + * compared to the modulus and conditionally adjusted by + * *subtracting* the latter. + */ + 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 - (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); + + return 1; +} + +#define nist_set_256(to, from, a1, a2, a3, a4, a5, a6, a7, a8) \ + { \ + bn_cp_32(to, 0, from, (a8) - 8) \ + bn_cp_32(to, 1, from, (a7) - 8) \ + bn_cp_32(to, 2, from, (a6) - 8) \ + bn_cp_32(to, 3, from, (a5) - 8) \ + bn_cp_32(to, 4, from, (a4) - 8) \ + bn_cp_32(to, 5, from, (a3) - 8) \ + bn_cp_32(to, 6, from, (a2) - 8) \ + bn_cp_32(to, 7, from, (a1) - 8) \ + } + +int BN_nist_mod_256(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, + BN_CTX *ctx) +{ + int i, top = a->top; + int carry = 0; + register BN_ULONG *a_d = a->d, *r_d; + 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; + 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, + OSSL_NELEM(_nist_p_256_sqr), + OSSL_NELEM(_nist_p_256_sqr), + 0, BN_FLG_STATIC_DATA + }; + + field = &_bignum_nist_p_256; /* just to make sure */ + + 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) { + BN_zero(r); + return 1; + } else if (i > 0) + return (r == a) ? 1 : (BN_copy(r, a) != NULL); + + if (r != a) { + if (!bn_wexpand(r, BN_NIST_256_TOP)) + return 0; + r_d = r->d; + nist_cp_bn(r_d, a_d, BN_NIST_256_TOP); + } else + r_d = a_d; + + 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.bn, 15, 14, 13, 12, 11, 0, 0, 0); + /* + * S2 + */ + 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; + 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; + } + carry += (int)bn_add_words(r_d, r_d, t_d, BN_NIST_256_TOP); + /* + * S3 + */ + 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.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.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.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.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.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 = + (int)bn_sub_words(r_d, r_d, _nist_p_256[carry - 1], + BN_NIST_256_TOP); + else if (carry < 0) { + 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 - (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); + + return 1; +} + +#define nist_set_384(to,from,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12) \ + { \ + bn_cp_32(to, 0, from, (a12) - 12) \ + bn_cp_32(to, 1, from, (a11) - 12) \ + bn_cp_32(to, 2, from, (a10) - 12) \ + bn_cp_32(to, 3, from, (a9) - 12) \ + bn_cp_32(to, 4, from, (a8) - 12) \ + bn_cp_32(to, 5, from, (a7) - 12) \ + bn_cp_32(to, 6, from, (a6) - 12) \ + bn_cp_32(to, 7, from, (a5) - 12) \ + bn_cp_32(to, 8, from, (a4) - 12) \ + bn_cp_32(to, 9, from, (a3) - 12) \ + bn_cp_32(to, 10, from, (a2) - 12) \ + bn_cp_32(to, 11, from, (a1) - 12) \ + } + +int BN_nist_mod_384(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, + BN_CTX *ctx) +{ + int i, top = a->top; + int carry = 0; + register BN_ULONG *r_d, *a_d = a->d; + 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; + 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, + OSSL_NELEM(_nist_p_384_sqr), + OSSL_NELEM(_nist_p_384_sqr), + 0, BN_FLG_STATIC_DATA + }; + + field = &_bignum_nist_p_384; /* just to make sure */ + + 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) { + BN_zero(r); + return 1; + } else if (i > 0) + return (r == a) ? 1 : (BN_copy(r, a) != NULL); + + if (r != a) { + if (!bn_wexpand(r, BN_NIST_384_TOP)) + return 0; + r_d = r->d; + nist_cp_bn(r_d, a_d, BN_NIST_384_TOP); + } else + r_d = a_d; + + 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.bn, 0, 0, 0, 0, 0, 23 - 4, 22 - 4, 21 - 4); + /* left shift */ + { + register BN_ULONG *ap, t, c; + ap = t_d; + c = 0; + for (i = 3; i != 0; --i) { + t = *ap; + *(ap++) = ((t << 1) | c) & BN_MASK2; + c = (t & BN_TBIT) ? 1 : 0; + } + *ap = c; + } + carry = + (int)bn_add_words(r_d + (128 / BN_BITS2), r_d + (128 / BN_BITS2), + t_d, BN_NIST_256_TOP); + /* + * S2 + */ + carry += (int)bn_add_words(r_d, r_d, buf.bn, BN_NIST_384_TOP); + /* + * S3 + */ + 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.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.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.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.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.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.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 = + (int)bn_sub_words(r_d, r_d, _nist_p_384[carry - 1], + BN_NIST_384_TOP); + else if (carry < 0) { + 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 - (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); + + 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) +{ + 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, + OSSL_NELEM(_nist_p_521_sqr), + OSSL_NELEM(_nist_p_521_sqr), + 0, BN_FLG_STATIC_DATA + }; + + field = &_bignum_nist_p_521; /* just to make sure */ + + if (BN_is_negative(a) || BN_ucmp(a, &_bignum_nist_p_521_sqr) >= 0) + return BN_nnmod(r, a, field, ctx); + + i = BN_ucmp(field, a); + if (i == 0) { + BN_zero(r); + return 1; + } else if (i > 0) + return (r == a) ? 1 : (BN_copy(r, a) != NULL); + + 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; + + /* 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_TOP - 1; i++) { +#if 0 + /* + * MSC ARM compiler [version 2013, presumably even earlier, + * much earlier] miscompiles this code, but not one in + * #else section. See RT#3541. + */ + tmp = val >> BN_NIST_521_RSHIFT; + val = t_d[i + 1]; + t_d[i] = (tmp | val << BN_NIST_521_LSHIFT) & BN_MASK2; +#else + t_d[i] = (val >> BN_NIST_521_RSHIFT | + (tmp = t_d[i + 1]) << BN_NIST_521_LSHIFT) & BN_MASK2; + val = tmp; +#endif + } + t_d[i] = val >> 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); + + return 1; +} + +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; +} |