mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 18:09:48 +00:00
269 lines
7.1 KiB
C++
269 lines
7.1 KiB
C++
// poly1305.cpp - written and placed in the public domain by Jeffrey Walton and Jean-Pierre Munch
|
|
// Based on Andy Polyakov's Base-2^26 scalar multiplication implementation for OpenSSL.
|
|
|
|
#include "pch.h"
|
|
#include "cryptlib.h"
|
|
#include "aes.h"
|
|
#include "cpu.h"
|
|
#include "poly1305.h"
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
#define CONSTANT_TIME_CARRY(a,b) ((a ^ ((a ^ b) | ((a - b) ^ b))) >> (sizeof(a) * 8 - 1))
|
|
|
|
template <class T>
|
|
void Poly1305_Base<T>::UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms)
|
|
{
|
|
if (key && length)
|
|
{
|
|
// key is {k,r} pair, r is 16 bytes
|
|
length = SaturatingSubtract(length, (unsigned)BLOCKSIZE);
|
|
m_cipher.SetKey(key, length);
|
|
key += length;
|
|
|
|
// Rbar is clamped and little endian
|
|
m_r[0] = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, key + 0) & 0x0fffffff;
|
|
m_r[1] = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, key + 4) & 0x0ffffffc;
|
|
m_r[2] = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, key + 8) & 0x0ffffffc;
|
|
m_r[3] = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, key + 12) & 0x0ffffffc;
|
|
|
|
m_used = false;
|
|
}
|
|
|
|
ConstByteArrayParameter t;
|
|
if (params.GetValue(Name::IV(), t) && t.begin() && t.size())
|
|
{
|
|
// Nonce key is a class member to avoid the zeroizer on a temporary
|
|
CRYPTOPP_ASSERT(t.size() == m_nk.size());
|
|
std::memcpy(m_nk.begin(), t.begin(), m_nk.size());
|
|
m_cipher.ProcessBlock(m_nk.begin());
|
|
|
|
m_n[0] = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, m_nk + 0);
|
|
m_n[1] = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, m_nk + 4);
|
|
m_n[2] = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, m_nk + 8);
|
|
m_n[3] = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, m_nk + 12);
|
|
|
|
m_used = false;
|
|
}
|
|
|
|
Restart();
|
|
}
|
|
|
|
template <class T>
|
|
void Poly1305_Base<T>::Update(const byte *input, size_t length)
|
|
{
|
|
CRYPTOPP_ASSERT((input && length) || !length);
|
|
if (!length) return;
|
|
|
|
size_t rem, num = m_idx;
|
|
if (num)
|
|
{
|
|
rem = BLOCKSIZE - num;
|
|
if (length >= rem)
|
|
{
|
|
// Process
|
|
memcpy_s(m_acc + num, BLOCKSIZE - num, input, rem);
|
|
HashBlocks(m_acc, BLOCKSIZE, 1);
|
|
input += rem;
|
|
length -= rem;
|
|
}
|
|
else
|
|
{
|
|
// Accumulate
|
|
memcpy_s(m_acc + num, BLOCKSIZE - num, input, length);
|
|
m_idx = num + length;
|
|
return;
|
|
}
|
|
}
|
|
|
|
rem = length % BLOCKSIZE;
|
|
length -= rem;
|
|
|
|
if (length >= BLOCKSIZE) {
|
|
HashBlocks(input, length, 1);
|
|
input += length;
|
|
}
|
|
|
|
if (rem)
|
|
memcpy(m_acc, input, rem);
|
|
|
|
m_idx = rem;
|
|
}
|
|
|
|
template <class T>
|
|
void Poly1305_Base<T>::HashBlocks(const byte *input, size_t length, word32 padbit)
|
|
{
|
|
word32 r0, r1, r2, r3;
|
|
word32 s1, s2, s3;
|
|
word32 h0, h1, h2, h3, h4, c;
|
|
word64 d0, d1, d2, d3;
|
|
|
|
r0 = m_r[0]; r1 = m_r[1];
|
|
r2 = m_r[2]; r3 = m_r[3];
|
|
|
|
s1 = r1 + (r1 >> 2);
|
|
s2 = r2 + (r2 >> 2);
|
|
s3 = r3 + (r3 >> 2);
|
|
|
|
h0 = m_h[0]; h1 = m_h[1]; h2 = m_h[2];
|
|
h3 = m_h[3]; h4 = m_h[4];
|
|
|
|
while (length >= BLOCKSIZE)
|
|
{
|
|
// h += m[i]
|
|
h0 = (word32)(d0 = (word64)h0 + GetWord<word32>(false, LITTLE_ENDIAN_ORDER, input + 0));
|
|
h1 = (word32)(d1 = (word64)h1 + (d0 >> 32) + GetWord<word32>(false, LITTLE_ENDIAN_ORDER, input + 4));
|
|
h2 = (word32)(d2 = (word64)h2 + (d1 >> 32) + GetWord<word32>(false, LITTLE_ENDIAN_ORDER, input + 8));
|
|
h3 = (word32)(d3 = (word64)h3 + (d2 >> 32) + GetWord<word32>(false, LITTLE_ENDIAN_ORDER, input + 12));
|
|
h4 += (word32)(d3 >> 32) + padbit;
|
|
|
|
// h *= r "%" p
|
|
d0 = ((word64)h0 * r0) +
|
|
((word64)h1 * s3) +
|
|
((word64)h2 * s2) +
|
|
((word64)h3 * s1);
|
|
d1 = ((word64)h0 * r1) +
|
|
((word64)h1 * r0) +
|
|
((word64)h2 * s3) +
|
|
((word64)h3 * s2) +
|
|
(h4 * s1);
|
|
d2 = ((word64)h0 * r2) +
|
|
((word64)h1 * r1) +
|
|
((word64)h2 * r0) +
|
|
((word64)h3 * s3) +
|
|
(h4 * s2);
|
|
d3 = ((word64)h0 * r3) +
|
|
((word64)h1 * r2) +
|
|
((word64)h2 * r1) +
|
|
((word64)h3 * r0) +
|
|
(h4 * s3);
|
|
h4 = (h4 * r0);
|
|
|
|
// a) h4:h0 = h4<<128 + d3<<96 + d2<<64 + d1<<32 + d0
|
|
h0 = (word32)d0;
|
|
h1 = (word32)(d1 += d0 >> 32);
|
|
h2 = (word32)(d2 += d1 >> 32);
|
|
h3 = (word32)(d3 += d2 >> 32);
|
|
h4 += (word32)(d3 >> 32);
|
|
|
|
// b) (h4:h0 += (h4:h0>>130) * 5) %= 2^130
|
|
c = (h4 >> 2) + (h4 & ~3U);
|
|
h4 &= 3;
|
|
h0 += c;
|
|
h1 += (c = CONSTANT_TIME_CARRY(h0,c));
|
|
h2 += (c = CONSTANT_TIME_CARRY(h1,c));
|
|
h3 += (c = CONSTANT_TIME_CARRY(h2,c));
|
|
h4 += CONSTANT_TIME_CARRY(h3,c);
|
|
|
|
input += BLOCKSIZE;
|
|
length -= BLOCKSIZE;
|
|
}
|
|
|
|
m_h[0] = h0; m_h[1] = h1; m_h[2] = h2;
|
|
m_h[3] = h3; m_h[4] = h4;
|
|
}
|
|
|
|
template <class T>
|
|
void Poly1305_Base<T>::TruncatedFinal(byte *mac, size_t size)
|
|
{
|
|
CRYPTOPP_ASSERT(mac); // Pointer is valid
|
|
CRYPTOPP_ASSERT(!m_used); // Nonce is fresh
|
|
|
|
ThrowIfInvalidTruncatedSize(size);
|
|
|
|
size_t num = m_idx;
|
|
if (num)
|
|
{
|
|
m_acc[num++] = 1; /* pad bit */
|
|
while (num < BLOCKSIZE)
|
|
m_acc[num++] = 0;
|
|
HashBlocks(m_acc, BLOCKSIZE, 0);
|
|
}
|
|
|
|
HashFinal(mac, size);
|
|
|
|
// Restart
|
|
m_used = true;
|
|
Restart();
|
|
}
|
|
|
|
template <class T>
|
|
void Poly1305_Base<T>::HashFinal(byte *mac, size_t size)
|
|
{
|
|
word32 h0, h1, h2, h3, h4;
|
|
word32 g0, g1, g2, g3, g4;
|
|
word32 mask;
|
|
word64 t;
|
|
|
|
h0 = m_h[0];
|
|
h1 = m_h[1];
|
|
h2 = m_h[2];
|
|
h3 = m_h[3];
|
|
h4 = m_h[4];
|
|
|
|
// compare to modulus by computing h + -p
|
|
g0 = (word32)(t = (word64)h0 + 5);
|
|
g1 = (word32)(t = (word64)h1 + (t >> 32));
|
|
g2 = (word32)(t = (word64)h2 + (t >> 32));
|
|
g3 = (word32)(t = (word64)h3 + (t >> 32));
|
|
g4 = h4 + (word32)(t >> 32);
|
|
|
|
// if there was carry into 131st bit, h3:h0 = g3:g0
|
|
mask = 0 - (g4 >> 2);
|
|
g0 &= mask; g1 &= mask;
|
|
g2 &= mask; g3 &= mask;
|
|
mask = ~mask;
|
|
h0 = (h0 & mask) | g0; h1 = (h1 & mask) | g1;
|
|
h2 = (h2 & mask) | g2; h3 = (h3 & mask) | g3;
|
|
|
|
// mac = (h + nonce) % (2^128)
|
|
h0 = (word32)(t = (word64)h0 + m_n[0]);
|
|
h1 = (word32)(t = (word64)h1 + (t >> 32) + m_n[1]);
|
|
h2 = (word32)(t = (word64)h2 + (t >> 32) + m_n[2]);
|
|
h3 = (word32)(t = (word64)h3 + (t >> 32) + m_n[3]);
|
|
|
|
if (size >= BLOCKSIZE)
|
|
{
|
|
PutWord<word32>(false, LITTLE_ENDIAN_ORDER, mac + 0, h0);
|
|
PutWord<word32>(false, LITTLE_ENDIAN_ORDER, mac + 4, h1);
|
|
PutWord<word32>(false, LITTLE_ENDIAN_ORDER, mac + 8, h2);
|
|
PutWord<word32>(false, LITTLE_ENDIAN_ORDER, mac + 12, h3);
|
|
}
|
|
else
|
|
{
|
|
FixedSizeAlignedSecBlock<byte, BLOCKSIZE> m;
|
|
PutWord<word32>(false, LITTLE_ENDIAN_ORDER, m + 0, h0);
|
|
PutWord<word32>(false, LITTLE_ENDIAN_ORDER, m + 4, h1);
|
|
PutWord<word32>(false, LITTLE_ENDIAN_ORDER, m + 8, h2);
|
|
PutWord<word32>(false, LITTLE_ENDIAN_ORDER, m + 12, h3);
|
|
memcpy(mac, m, size);
|
|
}
|
|
}
|
|
|
|
template <class T>
|
|
void Poly1305_Base<T>::Resynchronize(const byte *nonce, int nonceLength)
|
|
{
|
|
CRYPTOPP_ASSERT(nonceLength == -1 || nonceLength == (int)BLOCKSIZE);
|
|
nonceLength == -1 ? nonceLength = BLOCKSIZE : nonceLength;
|
|
this->UncheckedSetKey(NULLPTR, 0, MakeParameters(Name::IV(), ConstByteArrayParameter(nonce, nonceLength)));
|
|
}
|
|
|
|
template <class T>
|
|
void Poly1305_Base<T>::GetNextIV(RandomNumberGenerator &rng, byte *iv)
|
|
{
|
|
rng.GenerateBlock(iv, BLOCKSIZE);
|
|
}
|
|
|
|
template <class T>
|
|
void Poly1305_Base<T>::Restart()
|
|
{
|
|
m_h[0] = m_h[1] = m_h[2] = m_h[3] = m_h[4] = 0;
|
|
// m_r[0] = m_r[1] = m_r[2] = m_r[3] = 0;
|
|
m_idx = 0;
|
|
}
|
|
|
|
template class Poly1305_Base<AES>;
|
|
template class Poly1305<AES>;
|
|
|
|
NAMESPACE_END
|