mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-11-09 13:10:25 +00:00
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
/*
|
|
This file is basically ref10/fe_frombytes.h.
|
|
*/
|
|
|
|
#include "fe.h"
|
|
|
|
#ifdef HAVE_AVX_ASM
|
|
|
|
static uint64_t
|
|
load_3(const unsigned char *in)
|
|
{
|
|
uint64_t result;
|
|
result = (uint64_t) in[0];
|
|
result |= ((uint64_t) in[1]) << 8;
|
|
result |= ((uint64_t) in[2]) << 16;
|
|
return result;
|
|
}
|
|
|
|
static uint64_t
|
|
load_4(const unsigned char *in)
|
|
{
|
|
uint64_t result;
|
|
result = (uint64_t) in[0];
|
|
result |= ((uint64_t) in[1]) << 8;
|
|
result |= ((uint64_t) in[2]) << 16;
|
|
result |= ((uint64_t) in[3]) << 24;
|
|
return result;
|
|
}
|
|
|
|
void
|
|
fe_frombytes(fe h, const unsigned char *s)
|
|
{
|
|
uint64_t h0 = load_4(s);
|
|
uint64_t h1 = load_3(s + 4) << 6;
|
|
uint64_t h2 = load_3(s + 7) << 5;
|
|
uint64_t h3 = load_3(s + 10) << 3;
|
|
uint64_t h4 = load_3(s + 13) << 2;
|
|
uint64_t h5 = load_4(s + 16);
|
|
uint64_t h6 = load_3(s + 20) << 7;
|
|
uint64_t h7 = load_3(s + 23) << 5;
|
|
uint64_t h8 = load_3(s + 26) << 4;
|
|
uint64_t h9 = (load_3(s + 29) & 8388607) << 2;
|
|
uint64_t carry0;
|
|
uint64_t carry1;
|
|
uint64_t carry2;
|
|
uint64_t carry3;
|
|
uint64_t carry4;
|
|
uint64_t carry5;
|
|
uint64_t carry6;
|
|
uint64_t carry7;
|
|
uint64_t carry8;
|
|
uint64_t carry9;
|
|
|
|
carry9 = h9 >> 25; h0 += carry9 * 19; h9 &= 0x1FFFFFF;
|
|
carry1 = h1 >> 25; h2 += carry1; h1 &= 0x1FFFFFF;
|
|
carry3 = h3 >> 25; h4 += carry3; h3 &= 0x1FFFFFF;
|
|
carry5 = h5 >> 25; h6 += carry5; h5 &= 0x1FFFFFF;
|
|
carry7 = h7 >> 25; h8 += carry7; h7 &= 0x1FFFFFF;
|
|
|
|
carry0 = h0 >> 26; h1 += carry0; h0 &= 0x3FFFFFF;
|
|
carry2 = h2 >> 26; h3 += carry2; h2 &= 0x3FFFFFF;
|
|
carry4 = h4 >> 26; h5 += carry4; h4 &= 0x3FFFFFF;
|
|
carry6 = h6 >> 26; h7 += carry6; h6 &= 0x3FFFFFF;
|
|
carry8 = h8 >> 26; h9 += carry8; h8 &= 0x3FFFFFF;
|
|
|
|
h[0] = h0;
|
|
h[1] = h1;
|
|
h[2] = h2;
|
|
h[3] = h3;
|
|
h[4] = h4;
|
|
h[5] = h5;
|
|
h[6] = h6;
|
|
h[7] = h7;
|
|
h[8] = h8;
|
|
h[9] = h9;
|
|
}
|
|
|
|
#endif
|