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CBC decryption using AES-NI

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orignal 2014-05-13 13:43:07 -04:00
parent 6bf57cc4ae
commit 99c5331cad
1 changed files with 26 additions and 3 deletions
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29
aes.cpp
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@ -170,7 +170,7 @@ namespace crypto
__asm__
(
"movups (%[iv]), %%xmm1 \n"
"block: \n"
"block_e: \n"
"movups (%[in]), %%xmm0 \n"
"pxor %%xmm1, %%xmm0 \n"
EncryptAES256
@ -179,7 +179,7 @@ namespace crypto
"add $16, %[in] \n"
"add $16, %[out] \n"
"dec %[num] \n"
"jnz block; \n"
"jnz block_e; \n"
"movups %%xmm1, (%[iv]) \n"
:
: [iv]"r"(&m_LastBlock), [sched]"r"(m_ECBEncryption.GetKeySchedule ()),
@ -206,6 +206,28 @@ namespace crypto
void CBCDecryption::Decrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out)
{
#ifdef __x86_64__
__asm__
(
"movups (%[iv]), %%xmm1 \n"
"block_d: \n"
"movups (%[in]), %%xmm0 \n"
"movaps %%xmm0, %%xmm2 \n"
DecryptAES256
"pxor %%xmm1, %%xmm0 \n"
"movups %%xmm0, (%[out]) \n"
"movaps %%xmm2, %%xmm1 \n"
"add $16, %[in] \n"
"add $16, %[out] \n"
"dec %[num] \n"
"jnz block_d; \n"
"movups %%xmm1, (%[iv]) \n"
:
: [iv]"r"(&m_IV), [sched]"r"(m_ECBDecryption.GetKeySchedule ()),
[in]"r"(in), [out]"r"(out), [num]"r"(numBlocks)
: "%xmm0", "%xmm1", "%xmm2", "cc", "memory"
);
#else
for (int i = 0; i < numBlocks; i++)
{
ChipherBlock tmp = in[i];
@ -213,12 +235,13 @@ namespace crypto
out[i] ^= m_IV;
m_IV = tmp;
}
#endif
}
bool CBCDecryption::Decrypt (const uint8_t * in, std::size_t len, uint8_t * out)
{
div_t d = div (len, 16);
if (d.rem) return false; // len is not multipple of 16
if (d.rem) return false; // len is not multiple of 16
Decrypt (d.quot, (const ChipherBlock *)in, (ChipherBlock *)out);
return true;
}