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Move r1 write to caller; remove from Rijndael_Subkey_POWER8 

Signed-off-by: Jeffrey Walton <noloader@gmail.com>
pull/484/merge
Jeffrey Walton 2017-09-20 04:38:53 -04:00
parent 5159d0803d
commit c94d076aa1
1 changed files with 18 additions and 13 deletions
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31
rijndael-simd.cpp
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@ -1023,7 +1023,7 @@ const uint32_t s_rcon[3][4] = {
};
static inline uint8x16_p8
Rijndael_Subkey_POWER8(uint8x16_p8 r1, uint8x16_p8 r4, uint8_t subkey[16])
Rijndael_Subkey_POWER8(uint8x16_p8 r1, uint8x16_p8 r4)
{
const uint8x16_p8 r5 = (uint8x16_p8)((uint32x4_p8){0x0d0e0f0c,0x0d0e0f0c,0x0d0e0f0c,0x0d0e0f0c});
const uint8x16_p8 r0 = {0};
@ -1039,15 +1039,11 @@ Rijndael_Subkey_POWER8(uint8x16_p8 r1, uint8x16_p8 r4, uint8_t subkey[16])
r6 = vec_sld(r0, r6, 12); /* line 7 */
r1 = vec_xor(r1, r6); /* line 8 */
// Caller handles r4 addition
// Caller handles r4 (rcon) addition
// r4 = vec_add(r4, r4); /* line 9 */
r1 = vec_xor(r1, r3); /* line 10 */
const VectorType t = (VectorType)r1;
VectorStore(t, subkey);
// r1 is ready for next round
r1 = vec_xor(r1, r3); /* line 10 */
return r1;
}
@ -1064,20 +1060,29 @@ void Rijndael_UncheckedSetKey_POWER8(word32* rk, size_t keyLen, const word32* rc
for (unsigned int i=0; i<rounds-2; ++i)
{
skptr += 16;
r1 = Rijndael_Subkey_POWER8(r1, r4, skptr);
r1 = Rijndael_Subkey_POWER8(r1, r4);
r4 = vec_add(r4, r4);
skptr += 16;
const VectorType t = (VectorType)r1;
VectorStore(t, skptr);
}
/* Round 9 using rcon=0x1b */
skptr += 16;
r4 = (uint8x16_p8)VectorLoadKey(s_rcon[1]);
r1 = Rijndael_Subkey_POWER8(r1, r4, skptr);
r1 = Rijndael_Subkey_POWER8(r1, r4);
skptr += 16;
const VectorType t1 = (VectorType)r1;
VectorStore(t1, skptr);
/* Round 10 using rcon=0x36 */
skptr += 16;
r4 = (uint8x16_p8)VectorLoadKey(s_rcon[2]);
r1 = Rijndael_Subkey_POWER8(r1, r4, skptr);
r1 = Rijndael_Subkey_POWER8(r1, r4);
skptr += 16;
const VectorType t2 = (VectorType)r1;
VectorStore(t2, skptr);
return;
}