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some improvement of GOST R 34.11

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orignal 2017-03-20 14:25:38 -04:00
parent 726828a487
commit 199c2cdb66
1 changed files with 8 additions and 12 deletions
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20
Gost.cpp
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@ -2,6 +2,7 @@
#include <array> #include <array>
#include <openssl/sha.h> #include <openssl/sha.h>
#include <openssl/evp.h> #include <openssl/evp.h>
#include "I2PEndian.h"
#include "Gost.h" #include "Gost.h"
namespace i2p namespace i2p
@ -192,7 +193,7 @@ namespace crypto
0x492c024284fbaec0, 0xaa16012142f35760, 0x550b8e9e21f7a530, 0xa48b474f9ef5dc18, 0x492c024284fbaec0, 0xaa16012142f35760, 0x550b8e9e21f7a530, 0xa48b474f9ef5dc18,
0x70a6a56e2440598e, 0x3853dc371220a247, 0x1ca76e95091051ad, 0x0edd37c48a08a6d8, 0x70a6a56e2440598e, 0x3853dc371220a247, 0x1ca76e95091051ad, 0x0edd37c48a08a6d8,
0x07e095624504536c, 0x8d70c431ac02a736, 0xc83862965601dd1b, 0x641c314b2b8ee083 0x07e095624504536c, 0x8d70c431ac02a736, 0xc83862965601dd1b, 0x641c314b2b8ee083
}; }; // in Little Endian
static const uint8_t T_[64]= static const uint8_t T_[64]=
{ {
@ -337,23 +338,18 @@ namespace crypto
{ {
for (int i = 0; i < 8; i++) for (int i = 0; i < 8; i++)
{ {
union uint64_t c = 0;
{
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;
uint8_t byte = buf[i*8+j];
for (int k = 0; k < 8; k++) for (int k = 0; k < 8; k++)
{ {
if (buf[i*8+j] & bit) c.ll ^= A_[j*8+k]; if (byte & bit) c ^= A_[j*8+k];
bit >>= 1; bit >>= 1;
} }
} }
for (int j = 0; j < 8; j++) ll[i] = htobe64 (c);
buf[i*8+j] = c.b[7-j]; // invert
} }
} }
@ -391,8 +387,8 @@ namespace crypto
res.P (); res.P ();
res.L (); res.L ();
res = res.E (m); res = res.E (m);
res = res ^ h; res = res^h;
res = res ^ m; res = res^m;
return res; return res;
} }