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merge S,P,L for GOST R 34.11-2012

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orignal 2017-03-22 10:26:11 -04:00
parent 644c184f7c
commit 249bc42667
1 changed files with 8 additions and 39 deletions
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47
Gost.cpp
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@ -185,20 +185,7 @@ namespace crypto
0x492c024284fbaec0, 0xaa16012142f35760, 0x550b8e9e21f7a530, 0xa48b474f9ef5dc18,
0x70a6a56e2440598e, 0x3853dc371220a247, 0x1ca76e95091051ad, 0x0edd37c48a08a6d8,
0x07e095624504536c, 0x8d70c431ac02a736, 0xc83862965601dd1b, 0x641c314b2b8ee083
}; // in Little Endian
static const uint8_t T_[64]=
{
0, 8, 16, 24, 32, 40, 48, 56,
1, 9, 17, 25, 33, 41, 49, 57,
2, 10, 18, 26, 34, 42, 50, 58,
3, 11, 19, 27, 35, 43, 51, 59,
4, 12, 20, 28, 36, 44, 52, 60,
5, 13, 21, 29, 37, 45, 53, 61,
6, 14, 22, 30, 38, 46, 54, 62,
7, 15, 23, 31, 39, 47, 55, 63
};
};
static const uint8_t C_[12][64] =
{
@ -320,21 +307,17 @@ namespace crypto
}
}
void S ()
{
for (int i = 0; i < 64; i++)
buf[i] = sbox_[buf[i]];
}
void L ()
void SPL ()
{
uint8_t p[64];
memcpy (p, buf, 64); // we need to copy it for P's transposition
for (int i = 0; i < 8; i++)
{
uint64_t c = 0;
for (int j = 0; j < 8; j++)
{
uint8_t bit = 0x80;
uint8_t byte = buf[i*8+j];
uint8_t byte = sbox_[p[j*8+i]]; // S - sbox_, P - transpose (i,j)
for (int k = 0; k < 8; k++)
{
if (byte & bit) c ^= A_[j*8+k];
@ -345,27 +328,15 @@ namespace crypto
}
}
void P ()
{
uint8_t t[64];
for (int i = 0; i < 64; i++)
t[i] = buf[T_[i]];
memcpy (buf, t, 64);
}
GOST3411Block E (const GOST3411Block& m)
{
GOST3411Block k = *this;
GOST3411Block res = k^m;
for (int i = 0; i < 12; i++)
{
res.S ();
res.P ();
res.L ();
res.SPL ();
k = k^C_[i];
k.S ();
k.P ();
k.L ();
k.SPL ();
res = k^res;
}
return res;
@ -375,9 +346,7 @@ namespace crypto
static GOST3411Block gN (const GOST3411Block& N, const GOST3411Block& h, const GOST3411Block& m)
{
GOST3411Block res = N ^ h;
res.S ();
res.P ();
res.L ();
res.SPL ();
res = res.E (m);
res = res^h;
res = res^m;