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scalar: use newly introduced secp256k1_{read,write}_be64 helpers (4x64 impl.)

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This commit is contained in:
Sebastian Falbesoner 2023-06-17 01:04:37 +02:00
parent 67214f5f7d
commit 740528caad
2 changed files with 32 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)secp256k1_read_be32(&b32[24]) << 32) | (uint64_t)secp256k1_read_be32(&b32[28]); r->d[0] = secp256k1_read_be64(&b32[24]);
r->d[1] = ((uint64_t)secp256k1_read_be32(&b32[16]) << 32) | (uint64_t)secp256k1_read_be32(&b32[20]); r->d[1] = secp256k1_read_be64(&b32[16]);
r->d[2] = ((uint64_t)secp256k1_read_be32(&b32[8]) << 32) | (uint64_t)secp256k1_read_be32(&b32[12]); r->d[2] = secp256k1_read_be64(&b32[8]);
r->d[3] = ((uint64_t)secp256k1_read_be32(&b32[0]) << 32) | (uint64_t)secp256k1_read_be32(&b32[4]); r->d[3] = secp256k1_read_be64(&b32[0]);
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) {
secp256k1_write_be32(&bin[0], a->d[3] >> 32); secp256k1_write_be32(&bin[4], a->d[3]); secp256k1_write_be64(&bin[0], a->d[3]);
secp256k1_write_be32(&bin[8], a->d[2] >> 32); secp256k1_write_be32(&bin[12], a->d[2]); secp256k1_write_be64(&bin[8], a->d[2]);
secp256k1_write_be32(&bin[16], a->d[1] >> 32); secp256k1_write_be32(&bin[20], a->d[1]); secp256k1_write_be64(&bin[16], a->d[1]);
secp256k1_write_be32(&bin[24], a->d[0] >> 32); secp256k1_write_be32(&bin[28], a->d[0]); secp256k1_write_be64(&bin[24], 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) {

24
src/util.h
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@ -353,4 +353,28 @@ SECP256K1_INLINE static void secp256k1_write_be32(unsigned char* p, uint32_t x)
p[0] = x >> 24; p[0] = x >> 24;
} }
/* Read a uint64_t in big endian */
SECP256K1_INLINE static uint64_t secp256k1_read_be64(const unsigned char* p) {
return (uint64_t)p[0] << 56 |
(uint64_t)p[1] << 48 |
(uint64_t)p[2] << 40 |
(uint64_t)p[3] << 32 |
(uint64_t)p[4] << 24 |
(uint64_t)p[5] << 16 |
(uint64_t)p[6] << 8 |
(uint64_t)p[7];
}
/* Write a uint64_t in big endian */
SECP256K1_INLINE static void secp256k1_write_be64(unsigned char* p, uint64_t x) {
p[7] = x;
p[6] = x >> 8;
p[5] = x >> 16;
p[4] = x >> 24;
p[3] = x >> 32;
p[2] = x >> 40;
p[1] = x >> 48;
p[0] = x >> 56;
}
#endif /* SECP256K1_UTIL_H */ #endif /* SECP256K1_UTIL_H */