You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
125 lines
2.8 KiB
125 lines
2.8 KiB
// serpent.cpp - written and placed in the public domain by Wei Dai
|
|
|
|
#include "pch.h"
|
|
|
|
#include "serpent.h"
|
|
#include "secblock.h"
|
|
#include "misc.h"
|
|
|
|
#include "serpentp.h"
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
void Serpent_KeySchedule(word32 *k, unsigned int rounds, const byte *userKey, size_t keylen)
|
|
{
|
|
FixedSizeSecBlock<word32, 8> k0;
|
|
GetUserKey(LITTLE_ENDIAN_ORDER, k0.begin(), 8, userKey, keylen);
|
|
if (keylen < 32)
|
|
k0[keylen/4] |= word32(1) << ((keylen%4)*8);
|
|
|
|
word32 t = k0[7];
|
|
unsigned int i;
|
|
for (i = 0; i < 8; ++i)
|
|
k[i] = k0[i] = t = rotlFixed(k0[i] ^ k0[(i+3)%8] ^ k0[(i+5)%8] ^ t ^ 0x9e3779b9 ^ i, 11);
|
|
for (i = 8; i < 4*(rounds+1); ++i)
|
|
k[i] = t = rotlFixed(k[i-8] ^ k[i-5] ^ k[i-3] ^ t ^ 0x9e3779b9 ^ i, 11);
|
|
k -= 20;
|
|
|
|
word32 a,b,c,d,e;
|
|
for (i=0; i<rounds/8; i++)
|
|
{
|
|
afterS2(LK); afterS2(S3); afterS3(SK);
|
|
afterS1(LK); afterS1(S2); afterS2(SK);
|
|
afterS0(LK); afterS0(S1); afterS1(SK);
|
|
beforeS0(LK); beforeS0(S0); afterS0(SK);
|
|
k += 8*4;
|
|
afterS6(LK); afterS6(S7); afterS7(SK);
|
|
afterS5(LK); afterS5(S6); afterS6(SK);
|
|
afterS4(LK); afterS4(S5); afterS5(SK);
|
|
afterS3(LK); afterS3(S4); afterS4(SK);
|
|
}
|
|
afterS2(LK); afterS2(S3); afterS3(SK);
|
|
}
|
|
|
|
void Serpent::Base::UncheckedSetKey(const byte *userKey, unsigned int keylen, const NameValuePairs &)
|
|
{
|
|
AssertValidKeyLength(keylen);
|
|
Serpent_KeySchedule(m_key, 32, userKey, keylen);
|
|
}
|
|
|
|
typedef BlockGetAndPut<word32, LittleEndian> Block;
|
|
|
|
void Serpent::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
|
|
{
|
|
word32 a, b, c, d, e;
|
|
|
|
Block::Get(inBlock)(a)(b)(c)(d);
|
|
|
|
const word32 *k = m_key;
|
|
unsigned int i=1;
|
|
|
|
do
|
|
{
|
|
beforeS0(KX); beforeS0(S0); afterS0(LT);
|
|
afterS0(KX); afterS0(S1); afterS1(LT);
|
|
afterS1(KX); afterS1(S2); afterS2(LT);
|
|
afterS2(KX); afterS2(S3); afterS3(LT);
|
|
afterS3(KX); afterS3(S4); afterS4(LT);
|
|
afterS4(KX); afterS4(S5); afterS5(LT);
|
|
afterS5(KX); afterS5(S6); afterS6(LT);
|
|
afterS6(KX); afterS6(S7);
|
|
|
|
if (i == 4)
|
|
break;
|
|
|
|
++i;
|
|
c = b;
|
|
b = e;
|
|
e = d;
|
|
d = a;
|
|
a = e;
|
|
k += 32;
|
|
beforeS0(LT);
|
|
}
|
|
while (true);
|
|
|
|
afterS7(KX);
|
|
|
|
Block::Put(xorBlock, outBlock)(d)(e)(b)(a);
|
|
}
|
|
|
|
void Serpent::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
|
|
{
|
|
word32 a, b, c, d, e;
|
|
|
|
Block::Get(inBlock)(a)(b)(c)(d);
|
|
|
|
const word32 *k = m_key + 96;
|
|
unsigned int i=4;
|
|
|
|
beforeI7(KX);
|
|
goto start;
|
|
|
|
do
|
|
{
|
|
c = b;
|
|
b = d;
|
|
d = e;
|
|
k -= 32;
|
|
beforeI7(ILT);
|
|
start:
|
|
beforeI7(I7); afterI7(KX);
|
|
afterI7(ILT); afterI7(I6); afterI6(KX);
|
|
afterI6(ILT); afterI6(I5); afterI5(KX);
|
|
afterI5(ILT); afterI5(I4); afterI4(KX);
|
|
afterI4(ILT); afterI4(I3); afterI3(KX);
|
|
afterI3(ILT); afterI3(I2); afterI2(KX);
|
|
afterI2(ILT); afterI2(I1); afterI1(KX);
|
|
afterI1(ILT); afterI1(I0); afterI0(KX);
|
|
}
|
|
while (--i != 0);
|
|
|
|
Block::Put(xorBlock, outBlock)(a)(d)(b)(e);
|
|
}
|
|
|
|
NAMESPACE_END
|