mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 09:59:42 +00:00
245 lines
7.6 KiB
C++
245 lines
7.6 KiB
C++
// rabbit.cpp - written and placed in the public domain by Jeffrey Walton
|
|
// based on public domain code by Martin Boesgaard, Mette Vesterager,
|
|
// Thomas Pedersen, Jesper Christiansen and Ove Scavenius.
|
|
//
|
|
// The reference materials and source files are available at
|
|
// The eSTREAM Project, http://www.ecrypt.eu.org/stream/e2-rabbit.html.
|
|
|
|
#include "pch.h"
|
|
#include "config.h"
|
|
|
|
#include "rabbit.h"
|
|
#include "secblock.h"
|
|
#include "strciphr.h"
|
|
#include "misc.h"
|
|
|
|
#define WordType word32
|
|
|
|
#define BYTES_PER_ITERATION 16
|
|
|
|
#define RABBIT_OUTPUT(x){\
|
|
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 0, (m_wx[0] ^ (m_wx[5] >> 16) ^ (m_wx[3] << 16)));\
|
|
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 1, (m_wx[2] ^ (m_wx[7] >> 16) ^ (m_wx[5] << 16)));\
|
|
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 2, (m_wx[4] ^ (m_wx[1] >> 16) ^ (m_wx[7] << 16)));\
|
|
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 3, (m_wx[6] ^ (m_wx[3] >> 16) ^ (m_wx[1] << 16)));}
|
|
|
|
ANONYMOUS_NAMESPACE_BEGIN
|
|
|
|
using CryptoPP::word32;
|
|
using CryptoPP::word64;
|
|
using CryptoPP::rotlConstant;
|
|
|
|
word32 G_func(word32 x)
|
|
{
|
|
#if 0
|
|
/* Temporary variables */
|
|
word32 a, b, h, l;
|
|
|
|
/* Construct high and low argument for squaring */
|
|
a = x & 0xFFFF;
|
|
b = x >> 16;
|
|
|
|
/* Calculate high and low result of squaring */
|
|
h = (((static_cast<word32>(a*a) >> 17U) + static_cast<word32>(a*b)) >> 15U) + b*b;
|
|
l = x*x;
|
|
|
|
/* Return high XOR low */
|
|
return static_cast<word32>(h^l);
|
|
#endif
|
|
|
|
// Thanks to Jack Lloyd for suggesting the 64-bit multiply.
|
|
word64 z = x;
|
|
z *= x;
|
|
return static_cast<word32>((z >> 32) ^ z);
|
|
}
|
|
|
|
word32 NextState(word32 c[8], word32 x[8], word32 carry)
|
|
{
|
|
/* Temporary variables */
|
|
word32 g[8], c_old[8], i;
|
|
|
|
/* Save old counter values */
|
|
for (i = 0; i<8; i++)
|
|
c_old[i] = c[i];
|
|
|
|
/* Calculate new counter values */
|
|
c[0] = static_cast<word32>(c[0] + 0x4D34D34D + carry);
|
|
c[1] = static_cast<word32>(c[1] + 0xD34D34D3 + (c[0] < c_old[0]));
|
|
c[2] = static_cast<word32>(c[2] + 0x34D34D34 + (c[1] < c_old[1]));
|
|
c[3] = static_cast<word32>(c[3] + 0x4D34D34D + (c[2] < c_old[2]));
|
|
c[4] = static_cast<word32>(c[4] + 0xD34D34D3 + (c[3] < c_old[3]));
|
|
c[5] = static_cast<word32>(c[5] + 0x34D34D34 + (c[4] < c_old[4]));
|
|
c[6] = static_cast<word32>(c[6] + 0x4D34D34D + (c[5] < c_old[5]));
|
|
c[7] = static_cast<word32>(c[7] + 0xD34D34D3 + (c[6] < c_old[6]));
|
|
carry = (c[7] < c_old[7]);
|
|
|
|
/* Calculate the g-values */
|
|
for (i = 0; i<8; i++)
|
|
g[i] = G_func(static_cast<word32>(x[i] + c[i]));
|
|
|
|
/* Calculate new state values */
|
|
x[0] = static_cast<word32>(g[0] + rotlConstant<16>(g[7]) + rotlConstant<16>(g[6]));
|
|
x[1] = static_cast<word32>(g[1] + rotlConstant<8>(g[0]) + g[7]);
|
|
x[2] = static_cast<word32>(g[2] + rotlConstant<16>(g[1]) + rotlConstant<16>(g[0]));
|
|
x[3] = static_cast<word32>(g[3] + rotlConstant<8>(g[2]) + g[1]);
|
|
x[4] = static_cast<word32>(g[4] + rotlConstant<16>(g[3]) + rotlConstant<16>(g[2]));
|
|
x[5] = static_cast<word32>(g[5] + rotlConstant<8>(g[4]) + g[3]);
|
|
x[6] = static_cast<word32>(g[6] + rotlConstant<16>(g[5]) + rotlConstant<16>(g[4]));
|
|
x[7] = static_cast<word32>(g[7] + rotlConstant<8>(g[6]) + g[5]);
|
|
|
|
return carry;
|
|
}
|
|
|
|
ANONYMOUS_NAMESPACE_END
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
void RabbitPolicy::CipherSetKey(const NameValuePairs ¶ms, const byte *userKey, size_t keylen)
|
|
{
|
|
/* Generate four subkeys */
|
|
CRYPTOPP_UNUSED(params);
|
|
GetUserKey(LITTLE_ENDIAN_ORDER, m_t.begin(), 4, userKey, keylen);
|
|
|
|
/* Generate initial state variables */
|
|
m_mx[0] = m_t[0];
|
|
m_mx[2] = m_t[1];
|
|
m_mx[4] = m_t[2];
|
|
m_mx[6] = m_t[3];
|
|
m_mx[1] = static_cast<word32>(m_t[3] << 16) | (m_t[2] >> 16);
|
|
m_mx[3] = static_cast<word32>(m_t[0] << 16) | (m_t[3] >> 16);
|
|
m_mx[5] = static_cast<word32>(m_t[1] << 16) | (m_t[0] >> 16);
|
|
m_mx[7] = static_cast<word32>(m_t[2] << 16) | (m_t[1] >> 16);
|
|
|
|
/* Generate initial counter values */
|
|
m_mc[0] = rotlConstant<16>(m_t[2]);
|
|
m_mc[2] = rotlConstant<16>(m_t[3]);
|
|
m_mc[4] = rotlConstant<16>(m_t[0]);
|
|
m_mc[6] = rotlConstant<16>(m_t[1]);
|
|
m_mc[1] = (m_t[0] & 0xFFFF0000) | (m_t[1] & 0xFFFF);
|
|
m_mc[3] = (m_t[1] & 0xFFFF0000) | (m_t[2] & 0xFFFF);
|
|
m_mc[5] = (m_t[2] & 0xFFFF0000) | (m_t[3] & 0xFFFF);
|
|
m_mc[7] = (m_t[3] & 0xFFFF0000) | (m_t[0] & 0xFFFF);
|
|
|
|
/* Clear carry bit */
|
|
m_mcy = 0;
|
|
|
|
/* Iterate the system four times */
|
|
for (size_t i = 0; i<4; i++)
|
|
m_mcy = NextState(m_mc, m_mx, m_mcy);
|
|
|
|
/* Modify the counters */
|
|
for (size_t i = 0; i<8; i++)
|
|
m_mc[i] ^= m_mx[(i + 4) & 0x7];
|
|
|
|
/* Copy master instance to work instance */
|
|
for (size_t i = 0; i<8; i++)
|
|
{
|
|
m_wx[i] = m_mx[i];
|
|
m_wc[i] = m_mc[i];
|
|
}
|
|
m_wcy = m_mcy;
|
|
}
|
|
|
|
void RabbitPolicy::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)
|
|
{
|
|
do
|
|
{
|
|
/* Iterate the system */
|
|
m_wcy = NextState(m_wc, m_wx, m_wcy);
|
|
|
|
CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(RABBIT_OUTPUT, BYTES_PER_ITERATION);
|
|
|
|
} while (--iterationCount);
|
|
}
|
|
|
|
void RabbitWithIVPolicy::CipherSetKey(const NameValuePairs ¶ms, const byte *userKey, size_t keylen)
|
|
{
|
|
/* Generate four subkeys */
|
|
CRYPTOPP_UNUSED(params);
|
|
GetUserKey(LITTLE_ENDIAN_ORDER, m_t.begin(), 4, userKey, keylen);
|
|
|
|
/* Generate initial state variables */
|
|
m_mx[0] = m_t[0];
|
|
m_mx[2] = m_t[1];
|
|
m_mx[4] = m_t[2];
|
|
m_mx[6] = m_t[3];
|
|
m_mx[1] = static_cast<word32>(m_t[3] << 16) | (m_t[2] >> 16);
|
|
m_mx[3] = static_cast<word32>(m_t[0] << 16) | (m_t[3] >> 16);
|
|
m_mx[5] = static_cast<word32>(m_t[1] << 16) | (m_t[0] >> 16);
|
|
m_mx[7] = static_cast<word32>(m_t[2] << 16) | (m_t[1] >> 16);
|
|
|
|
/* Generate initial counter values */
|
|
m_mc[0] = rotlConstant<16>(m_t[2]);
|
|
m_mc[2] = rotlConstant<16>(m_t[3]);
|
|
m_mc[4] = rotlConstant<16>(m_t[0]);
|
|
m_mc[6] = rotlConstant<16>(m_t[1]);
|
|
m_mc[1] = (m_t[0] & 0xFFFF0000) | (m_t[1] & 0xFFFF);
|
|
m_mc[3] = (m_t[1] & 0xFFFF0000) | (m_t[2] & 0xFFFF);
|
|
m_mc[5] = (m_t[2] & 0xFFFF0000) | (m_t[3] & 0xFFFF);
|
|
m_mc[7] = (m_t[3] & 0xFFFF0000) | (m_t[0] & 0xFFFF);
|
|
|
|
/* Clear carry bit */
|
|
m_mcy = 0;
|
|
|
|
/* Iterate the system four times */
|
|
for (size_t i = 0; i<4; i++)
|
|
m_mcy = NextState(m_mc, m_mx, m_mcy);
|
|
|
|
/* Modify the counters */
|
|
for (size_t i = 0; i<8; i++)
|
|
m_mc[i] ^= m_mx[(i + 4) & 0x7];
|
|
|
|
/* Copy master instance to work instance */
|
|
for (size_t i = 0; i<8; i++)
|
|
{
|
|
m_wx[i] = m_mx[i];
|
|
m_wc[i] = m_mc[i];
|
|
}
|
|
m_wcy = m_mcy;
|
|
}
|
|
|
|
void RabbitWithIVPolicy::CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length)
|
|
{
|
|
CRYPTOPP_UNUSED(keystreamBuffer);
|
|
CRYPTOPP_UNUSED(length);
|
|
CRYPTOPP_ASSERT(length == 8);
|
|
|
|
/* Generate four subvectors */
|
|
GetBlock<word32, LittleEndian> v(iv); v(m_t[0])(m_t[2]);
|
|
m_t[1] = (m_t[0] >> 16) | (m_t[2] & 0xFFFF0000);
|
|
m_t[3] = (m_t[2] << 16) | (m_t[0] & 0x0000FFFF);
|
|
|
|
/* Modify counter values */
|
|
m_wc[0] = m_mc[0] ^ m_t[0];
|
|
m_wc[1] = m_mc[1] ^ m_t[1];
|
|
m_wc[2] = m_mc[2] ^ m_t[2];
|
|
m_wc[3] = m_mc[3] ^ m_t[3];
|
|
m_wc[4] = m_mc[4] ^ m_t[0];
|
|
m_wc[5] = m_mc[5] ^ m_t[1];
|
|
m_wc[6] = m_mc[6] ^ m_t[2];
|
|
m_wc[7] = m_mc[7] ^ m_t[3];
|
|
|
|
/* Copy state variables */
|
|
for (size_t i = 0; i<8; i++)
|
|
m_wx[i] = m_mx[i];
|
|
m_wcy = m_mcy;
|
|
|
|
/* Iterate the system four times */
|
|
for (size_t i = 0; i<4; i++)
|
|
m_wcy = NextState(m_wc, m_wx, m_wcy);
|
|
}
|
|
|
|
void RabbitWithIVPolicy::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)
|
|
{
|
|
do
|
|
{
|
|
/* Iterate the system */
|
|
m_wcy = NextState(m_wc, m_wx, m_wcy);
|
|
|
|
CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(RABBIT_OUTPUT, BYTES_PER_ITERATION);
|
|
|
|
} while (--iterationCount);
|
|
}
|
|
|
|
NAMESPACE_END
|