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scalar: use secp256k1_{read,write}_be32 helpers (4x64 impl.)

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An alternative would be to introduce special helpers for reading/writing
uint64_t in big endian `secp256k1_{read,write}_be64`.
This commit is contained in:
Sebastian Falbesoner 2023-06-10 19:50:54 +02:00
parent 52b84238de
commit 887183e7de
1 changed files with 8 additions and 8 deletions
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16
src/scalar_4x64_impl.h
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@ -133,10 +133,10 @@ static void secp256k1_scalar_cadd_bit(secp256k1_scalar *r, unsigned int bit, int
static void secp256k1_scalar_set_b32(secp256k1_scalar *r, const unsigned char *b32, int *overflow) { static void secp256k1_scalar_set_b32(secp256k1_scalar *r, const unsigned char *b32, int *overflow) {
int over; int over;
r->d[0] = (uint64_t)b32[31] | (uint64_t)b32[30] << 8 | (uint64_t)b32[29] << 16 | (uint64_t)b32[28] << 24 | (uint64_t)b32[27] << 32 | (uint64_t)b32[26] << 40 | (uint64_t)b32[25] << 48 | (uint64_t)b32[24] << 56; r->d[0] = ((uint64_t)secp256k1_read_be32(&b32[24]) << 32) | (uint64_t)secp256k1_read_be32(&b32[28]);
r->d[1] = (uint64_t)b32[23] | (uint64_t)b32[22] << 8 | (uint64_t)b32[21] << 16 | (uint64_t)b32[20] << 24 | (uint64_t)b32[19] << 32 | (uint64_t)b32[18] << 40 | (uint64_t)b32[17] << 48 | (uint64_t)b32[16] << 56; r->d[1] = ((uint64_t)secp256k1_read_be32(&b32[16]) << 32) | (uint64_t)secp256k1_read_be32(&b32[20]);
r->d[2] = (uint64_t)b32[15] | (uint64_t)b32[14] << 8 | (uint64_t)b32[13] << 16 | (uint64_t)b32[12] << 24 | (uint64_t)b32[11] << 32 | (uint64_t)b32[10] << 40 | (uint64_t)b32[9] << 48 | (uint64_t)b32[8] << 56; r->d[2] = ((uint64_t)secp256k1_read_be32(&b32[8]) << 32) | (uint64_t)secp256k1_read_be32(&b32[12]);
r->d[3] = (uint64_t)b32[7] | (uint64_t)b32[6] << 8 | (uint64_t)b32[5] << 16 | (uint64_t)b32[4] << 24 | (uint64_t)b32[3] << 32 | (uint64_t)b32[2] << 40 | (uint64_t)b32[1] << 48 | (uint64_t)b32[0] << 56; r->d[3] = ((uint64_t)secp256k1_read_be32(&b32[0]) << 32) | (uint64_t)secp256k1_read_be32(&b32[4]);
over = secp256k1_scalar_reduce(r, secp256k1_scalar_check_overflow(r)); over = secp256k1_scalar_reduce(r, secp256k1_scalar_check_overflow(r));
if (overflow) { if (overflow) {
*overflow = over; *overflow = over;
@ -144,10 +144,10 @@ static void secp256k1_scalar_set_b32(secp256k1_scalar *r, const unsigned char *b
} }
static void secp256k1_scalar_get_b32(unsigned char *bin, const secp256k1_scalar* a) { static void secp256k1_scalar_get_b32(unsigned char *bin, const secp256k1_scalar* a) {
bin[0] = a->d[3] >> 56; bin[1] = a->d[3] >> 48; bin[2] = a->d[3] >> 40; bin[3] = a->d[3] >> 32; bin[4] = a->d[3] >> 24; bin[5] = a->d[3] >> 16; bin[6] = a->d[3] >> 8; bin[7] = a->d[3]; secp256k1_write_be32(&bin[0], a->d[3] >> 32); secp256k1_write_be32(&bin[4], a->d[3]);
bin[8] = a->d[2] >> 56; bin[9] = a->d[2] >> 48; bin[10] = a->d[2] >> 40; bin[11] = a->d[2] >> 32; bin[12] = a->d[2] >> 24; bin[13] = a->d[2] >> 16; bin[14] = a->d[2] >> 8; bin[15] = a->d[2]; secp256k1_write_be32(&bin[8], a->d[2] >> 32); secp256k1_write_be32(&bin[12], a->d[2]);
bin[16] = a->d[1] >> 56; bin[17] = a->d[1] >> 48; bin[18] = a->d[1] >> 40; bin[19] = a->d[1] >> 32; bin[20] = a->d[1] >> 24; bin[21] = a->d[1] >> 16; bin[22] = a->d[1] >> 8; bin[23] = a->d[1]; secp256k1_write_be32(&bin[16], a->d[1] >> 32); secp256k1_write_be32(&bin[20], a->d[1]);
bin[24] = a->d[0] >> 56; bin[25] = a->d[0] >> 48; bin[26] = a->d[0] >> 40; bin[27] = a->d[0] >> 32; bin[28] = a->d[0] >> 24; bin[29] = a->d[0] >> 16; bin[30] = a->d[0] >> 8; bin[31] = a->d[0]; secp256k1_write_be32(&bin[24], a->d[0] >> 32); secp256k1_write_be32(&bin[28], a->d[0]);
} }
SECP256K1_INLINE static int secp256k1_scalar_is_zero(const secp256k1_scalar *a) { SECP256K1_INLINE static int secp256k1_scalar_is_zero(const secp256k1_scalar *a) {