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correct implementation of L for GOST R 34.11-2012

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orignal 2017-03-20 11:33:45 -04:00
parent 7637b51ba5
commit fcbf81a3d4
1 changed files with 10 additions and 4 deletions
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14
Gost.cpp
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@ -337,17 +337,23 @@ namespace crypto
{ {
for (int i = 0; i < 8; i++) for (int i = 0; i < 8; i++)
{ {
uint64_t c = 0; union
{
uint8_t b[8];
uint64_t ll;
} c;
c.ll = 0;
for (int j = 0; j < 8; j++) for (int j = 0; j < 8; j++)
{ {
uint8_t bit = 0x80; uint8_t bit = 0x80;
for (int k = 0; k < 8; k++) for (int k = 0; k < 8; k++)
{ {
if (buf[i*8+j] & bit) c ^= A_[j*8+k]; if (buf[i*8+j] & bit) c.ll ^= A_[j*8+k];
bit >>= 1; bit >>= 1;
} }
} }
ll[i] = c; for (int j = 0; j < 8; j++)
buf[i*8+j] = c.b[7-j]; // invert
} }
} }
@ -405,7 +411,7 @@ namespace crypto
h= gN (N, h, m); h= gN (N, h, m);
N.Add (512); N.Add (512);
s = m + s; s = m + s;
len -= 64; l -= 64;
} }
// stage 3 // stage 3
size_t padding = 64 - l; size_t padding = 64 - l;