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ChiperBlock XOR

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orignal 2014-05-09 12:05:04 -04:00
parent 9372b33c2c
commit 37c3a9dcf1
2 changed files with 5 additions and 6 deletions
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6
aes.cpp
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@ -165,8 +165,7 @@ namespace crypto
{
for (int i = 0; i < numBlocks; i++)
{
m_LastBlock.ll[0] ^= in[i].ll[0];
m_LastBlock.ll[1] ^= in[i].ll[1];
m_LastBlock ^= in[i];
m_ECBEncryption.Encrypt (&m_LastBlock, &m_LastBlock);
out[i] = m_LastBlock;
}
@ -186,8 +185,7 @@ namespace crypto
{
ChipherBlock tmp = in[i];
m_ECBDecryption.Decrypt (in + i, out + i);
out[i].ll[0] ^= m_IV.ll[0];
out[i].ll[1] ^= m_IV.ll[1];
out[i] ^= m_IV;
m_IV = tmp;
}
}

5
aes.h
View File

@ -14,13 +14,14 @@ namespace crypto
uint8_t buf[16];
uint64_t ll[2];
void operator^(const ChipherBlock& other) // XOR
void operator^=(const ChipherBlock& other) // XOR
{
#ifdef __x86_64__
__asm__
(
"movups (%[b1]), %%xmm0 \n"
"pxor (%[b2]), %%xmm0 \n"
"movups (%[b2]), %%xmm1 \n" // b2 might not be 16-bytes aligned
"pxor %%xmm1, %%xmm0 \n"
"movups %%xmm0, (%[b1]) \n"
: : [b1]"r"(buf), [b2]"r"(other.buf): "memory", "%xmm0"
);