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Load r5 mask once for key expansion

pull/484/merge
Jeffrey Walton 2017-09-20 20:27:58 -04:00
parent e4498a105e
commit 9fd5d023f9
No known key found for this signature in database
GPG Key ID: B36AB348921B1838
1 changed files with 10 additions and 8 deletions
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18
rijndael-simd.cpp
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@ -1060,22 +1060,23 @@ static inline T1 VectorDecryptLast(const T1& state, const T2& key)
//////////////////////////////////////////////////////////////////
/* Round constants */
CRYPTOPP_ALIGN_DATA(16)
static const uint32_t s_rcon[3][4] = {
{0x01<<24,0x01<<24,0x01<<24,0x01<<24}, /* 1 */
{0x1b<<24,0x1b<<24,0x1b<<24,0x1b<<24}, /* 9 */
{0x36<<24,0x36<<24,0x36<<24,0x36<<24} /* 10 */
};
/* Permute mask */
CRYPTOPP_ALIGN_DATA(16)
static const uint32_t s_mask[4] = {
0x0d0e0f0c, 0x0d0e0f0c, 0x0d0e0f0c, 0x0d0e0f0c
};
static inline uint8x16_p8
Rijndael_Subkey_POWER8(uint8x16_p8 r1, const uint8x16_p8 r4)
Rijndael_Subkey_POWER8(uint8x16_p8 r1, const uint8x16_p8 r4, const uint8x16_p8 r5)
{
const uint8x16_p8 r5 = (uint8x16_p8)VectorLoad(s_mask);
const uint8x16_p8 r0 = {0};
uint8x16_p8 r3, r6;
r3 = vec_perm(r1, r1, r5); /* line 1 */
@ -1104,12 +1105,13 @@ void Rijndael_UncheckedSetKey_POWER8(word32* rk, size_t keyLen, const word32* rc
if (keyLen == 16)
{
uint8_t* skptr = (uint8_t*)rk;
uint8x16_p8 r1 = (uint8x16_p8)VectorLoadKey((uint8_t*)skptr);
uint8x16_p8 r4 = (uint8x16_p8)VectorLoad(s_rcon[0]);
uint8x16_p8 r1 = (uint8x16_p8)VectorLoad((uint8_t*)skptr);
uint8x16_p8 r4 = (uint8x16_p8)VectorLoadKey(s_rcon[0]);
uint8x16_p8 r5 = (uint8x16_p8)VectorLoadKey(s_mask);
for (unsigned int i=0; i<rounds-2; ++i)
{
r1 = Rijndael_Subkey_POWER8(r1, r4);
r1 = Rijndael_Subkey_POWER8(r1, r4, r5);
r4 = vec_add(r4, r4);
skptr += 16;
@ -1119,7 +1121,7 @@ void Rijndael_UncheckedSetKey_POWER8(word32* rk, size_t keyLen, const word32* rc
/* Round 9 using rcon=0x1b */
r4 = (uint8x16_p8)VectorLoadKey(s_rcon[1]);
r1 = Rijndael_Subkey_POWER8(r1, r4);
r1 = Rijndael_Subkey_POWER8(r1, r4, r5);
skptr += 16;
const VectorType t1 = (VectorType)r1;
@ -1127,7 +1129,7 @@ void Rijndael_UncheckedSetKey_POWER8(word32* rk, size_t keyLen, const word32* rc
/* Round 10 using rcon=0x36 */
r4 = (uint8x16_p8)VectorLoadKey(s_rcon[2]);
r1 = Rijndael_Subkey_POWER8(r1, r4);
r1 = Rijndael_Subkey_POWER8(r1, r4, r5);
skptr += 16;
const VectorType t2 = (VectorType)r1;