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authorMatt Johnston <matt@ucc.asn.au>2018-02-09 21:44:05 +0800
committerMatt Johnston <matt@ucc.asn.au>2018-02-09 21:44:05 +0800
commit4f2eb1914bdac3ed3ee504ad86061281dbe0d074 (patch)
tree078293375c3f3ee2d485cf9559a08d65d460786a /libtomcrypt/src/encauth/gcm/gcm_gf_mult.c
parentd72f50ff3284e15124a0f233c26339229fe305ac (diff)
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Diffstat (limited to 'libtomcrypt/src/encauth/gcm/gcm_gf_mult.c')
-rw-r--r--libtomcrypt/src/encauth/gcm/gcm_gf_mult.c34
1 files changed, 16 insertions, 18 deletions
diff --git a/libtomcrypt/src/encauth/gcm/gcm_gf_mult.c b/libtomcrypt/src/encauth/gcm/gcm_gf_mult.c
index 72e0624..2e7a906 100644
--- a/libtomcrypt/src/encauth/gcm/gcm_gf_mult.c
+++ b/libtomcrypt/src/encauth/gcm/gcm_gf_mult.c
@@ -5,8 +5,6 @@
*
* The library is free for all purposes without any express
* guarantee it works.
- *
- * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
*/
/**
@@ -15,9 +13,9 @@
*/
#include "tomcrypt.h"
-#if defined(LTC_GCM_TABLES) || defined(LRW_TABLES) || ((defined(LTC_GCM_MODE) || defined(LTC_GCM_MODE)) && defined(LTC_FAST))
+#if defined(LTC_GCM_TABLES) || defined(LTC_LRW_TABLES) || ((defined(LTC_GCM_MODE) || defined(LTC_GCM_MODE)) && defined(LTC_FAST))
-/* this is x*2^128 mod p(x) ... the results are 16 bytes each stored in a packed format. Since only the
+/* this is x*2^128 mod p(x) ... the results are 16 bytes each stored in a packed format. Since only the
* lower 16 bits are not zero'ed I removed the upper 14 bytes */
const unsigned char gcm_shift_table[256*2] = {
0x00, 0x00, 0x01, 0xc2, 0x03, 0x84, 0x02, 0x46, 0x07, 0x08, 0x06, 0xca, 0x04, 0x8c, 0x05, 0x4e,
@@ -60,7 +58,7 @@ const unsigned char gcm_shift_table[256*2] = {
#ifndef LTC_FAST
/* right shift */
-static void gcm_rightshift(unsigned char *a)
+static void _gcm_rightshift(unsigned char *a)
{
int x;
for (x = 15; x > 0; x--) {
@@ -73,28 +71,28 @@ static void gcm_rightshift(unsigned char *a)
static const unsigned char mask[] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
static const unsigned char poly[] = { 0x00, 0xE1 };
-
+
/**
GCM GF multiplier (internal use only) bitserial
@param a First value
@param b Second value
@param c Destination for a * b
- */
+ */
void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *c)
{
unsigned char Z[16], V[16];
- unsigned x, y, z;
+ unsigned char x, y, z;
zeromem(Z, 16);
XMEMCPY(V, a, 16);
for (x = 0; x < 128; x++) {
if (b[x>>3] & mask[x&7]) {
for (y = 0; y < 16; y++) {
- Z[y] ^= V[y];
+ Z[y] ^= V[y];
}
}
z = V[15] & 0x01;
- gcm_rightshift(V);
+ _gcm_rightshift(V);
V[0] ^= poly[z];
}
XMEMCPY(c, Z, 16);
@@ -113,7 +111,7 @@ void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *
@param a First value
@param b Second value
@param c Destination for a * b
- */
+ */
void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *c)
{
int i, j, k, u;
@@ -129,7 +127,7 @@ void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *
LOAD32H(B[M(1)][i], a + (i<<2));
LOAD32L(pB[i], b + (i<<2));
}
-#else
+#else
for (i = 0; i < 2; i++) {
LOAD64H(B[M(1)][i], a + (i<<3));
LOAD64L(pB[i], b + (i<<3));
@@ -154,7 +152,7 @@ void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *
B[M(9)][i] = B[M(1)][i] ^ B[M(8)][i];
B[M(10)][i] = B[M(2)][i] ^ B[M(8)][i];
B[M(12)][i] = B[M(8)][i] ^ B[M(4)][i];
-
+
/* now all 3 bit values and the only 4 bit value: 7, 11, 13, 14, 15 */
B[M(7)][i] = B[M(3)][i] ^ B[M(4)][i];
B[M(11)][i] = B[M(3)][i] ^ B[M(8)][i];
@@ -193,7 +191,7 @@ void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *
for (i = 0; i < 8; i++) {
STORE32H(tmp[i], pTmp + (i<<2));
}
-#else
+#else
for (i = 0; i < 4; i++) {
STORE64H(tmp[i], pTmp + (i<<3));
}
@@ -215,7 +213,7 @@ void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *
#endif
-/* $Source$ */
-/* $Revision$ */
-/* $Date$ */
-
+/* ref: $Format:%D$ */
+/* git commit: $Format:%H$ */
+/* commit time: $Format:%ai$ */
+