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Rework OperateKeystream (GH #680) 

This improves performance on a Core i5 6400 from 5.4 cpb to 2.9 cpb
pull/681/head^2
Jeffrey Walton 2018-07-05 07:11:44 -04:00
parent 989bf6dc5e
commit 23c8bfde7e
No known key found for this signature in database
GPG Key ID: B36AB348921B1838
1 changed files with 24 additions and 25 deletions
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49
hc256.cpp
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@ -18,43 +18,43 @@ using CryptoPP::rotrConstant;
inline word32 f1(word32 x)
{
return rotrConstant<7>(x) ^ rotrConstant<18>(x) ^ ((x) >> 3);
return rotrConstant<7>(x) ^ rotrConstant<18>(x) ^ (x >> 3);
}
inline word32 f2(word32 x)
{
return rotrConstant<17>(x) ^ rotrConstant<19>(x) ^ ((x) >> 10);
return rotrConstant<17>(x) ^ rotrConstant<19>(x) ^ (x >> 10);
}
ANONYMOUS_NAMESPACE_END
NAMESPACE_BEGIN(CryptoPP)
word32 HC256Policy::H1(word32 u)
inline word32 HC256Policy::H1(word32 u)
{
word32 tem;
unsigned char a, b, c, d;
a = (unsigned char)((u));
b = (unsigned char)((u) >> 8);
c = (unsigned char)((u) >> 16);
d = (unsigned char)((u) >> 24);
byte a, b, c, d;
a = (byte)((u));
b = (byte)((u) >> 8);
c = (byte)((u) >> 16);
d = (byte)((u) >> 24);
tem = m_Q[a] + m_Q[256 + b] + m_Q[512 + c] + m_Q[768 + d];
return (tem);
}
word32 HC256Policy::H2(word32 u)
inline word32 HC256Policy::H2(word32 u)
{
word32 tem;
unsigned char a, b, c, d;
a = (unsigned char)((u));
b = (unsigned char)((u) >> 8);
c = (unsigned char)((u) >> 16);
d = (unsigned char)((u) >> 24);
byte a, b, c, d;
a = (byte)((u));
b = (byte)((u) >> 8);
c = (byte)((u) >> 16);
d = (byte)((u) >> 24);
tem = m_P[a] + m_P[256 + b] + m_P[512 + c] + m_P[768 + d];
return (tem);
}
word32 HC256Policy::Generate() /*one step of the cipher*/
inline word32 HC256Policy::Generate() /*one step of the cipher*/
{
word32 i, i3, i10, i12, i1023;
word32 output;
@ -94,17 +94,16 @@ void HC256Policy::CipherSetKey(const NameValuePairs &params, const byte *userKey
void HC256Policy::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)
{
size_t msglen = (GetBytesPerIteration() * iterationCount) >> 2;
for (unsigned int i = 0; i < msglen; i++, input += 4, output += 4)
{
PutWord(false, LITTLE_ENDIAN_ORDER, output, Generate());
size_t msglen = GetBytesPerIteration() * iterationCount;
const byte* in = input; byte* out = output;
for (unsigned int i = 0; i < (msglen >> 2); i++, in += 4, out += 4)
PutWord(false, LITTLE_ENDIAN_ORDER, out, Generate());
// If AdditiveCipherTemplate does not have an acculated keystream
// then it will ask OperateKeystream to XOR the plaintext with
// the keystream and write it to the ciphertext buffer.
if ((operation & INPUT_NULL) != INPUT_NULL)
xorbuf(output, input, 4);
}
// If AdditiveCipherTemplate does not have an acculated keystream
// then it will ask OperateKeystream to XOR the plaintext with
// the keystream and write it to the ciphertext buffer.
if ((operation & INPUT_NULL) != INPUT_NULL)
xorbuf(output, input, msglen);
}
void HC256Policy::CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length)