mirror of
https://github.com/oxen-io/session-android.git
synced 2024-11-28 04:25:18 +00:00
74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
#include "fe.h"
|
|
#include "crypto_int64.h"
|
|
#include "crypto_uint64.h"
|
|
|
|
static crypto_uint64 load_3(const unsigned char *in)
|
|
{
|
|
crypto_uint64 result;
|
|
result = (crypto_uint64) in[0];
|
|
result |= ((crypto_uint64) in[1]) << 8;
|
|
result |= ((crypto_uint64) in[2]) << 16;
|
|
return result;
|
|
}
|
|
|
|
static crypto_uint64 load_4(const unsigned char *in)
|
|
{
|
|
crypto_uint64 result;
|
|
result = (crypto_uint64) in[0];
|
|
result |= ((crypto_uint64) in[1]) << 8;
|
|
result |= ((crypto_uint64) in[2]) << 16;
|
|
result |= ((crypto_uint64) in[3]) << 24;
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
Ignores top bit of h.
|
|
*/
|
|
|
|
void fe_frombytes(fe h,const unsigned char *s)
|
|
{
|
|
crypto_int64 h0 = load_4(s);
|
|
crypto_int64 h1 = load_3(s + 4) << 6;
|
|
crypto_int64 h2 = load_3(s + 7) << 5;
|
|
crypto_int64 h3 = load_3(s + 10) << 3;
|
|
crypto_int64 h4 = load_3(s + 13) << 2;
|
|
crypto_int64 h5 = load_4(s + 16);
|
|
crypto_int64 h6 = load_3(s + 20) << 7;
|
|
crypto_int64 h7 = load_3(s + 23) << 5;
|
|
crypto_int64 h8 = load_3(s + 26) << 4;
|
|
crypto_int64 h9 = (load_3(s + 29) & 8388607) << 2;
|
|
crypto_int64 carry0;
|
|
crypto_int64 carry1;
|
|
crypto_int64 carry2;
|
|
crypto_int64 carry3;
|
|
crypto_int64 carry4;
|
|
crypto_int64 carry5;
|
|
crypto_int64 carry6;
|
|
crypto_int64 carry7;
|
|
crypto_int64 carry8;
|
|
crypto_int64 carry9;
|
|
|
|
carry9 = (h9 + (crypto_int64) (1<<24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
|
|
carry1 = (h1 + (crypto_int64) (1<<24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
|
|
carry3 = (h3 + (crypto_int64) (1<<24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
|
|
carry5 = (h5 + (crypto_int64) (1<<24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
|
|
carry7 = (h7 + (crypto_int64) (1<<24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
|
|
|
|
carry0 = (h0 + (crypto_int64) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
|
|
carry2 = (h2 + (crypto_int64) (1<<25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
|
|
carry4 = (h4 + (crypto_int64) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
|
|
carry6 = (h6 + (crypto_int64) (1<<25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
|
|
carry8 = (h8 + (crypto_int64) (1<<25)) >> 26; h9 += carry8; h8 -= carry8 << 26;
|
|
|
|
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;
|
|
}
|