mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-12-11 12:14:30 +00:00
316 lines
9.1 KiB
C++
316 lines
9.1 KiB
C++
// siphash.h - written and placed in public domain by Jeffrey Walton.
|
|
|
|
//! \file siphash.h
|
|
//! \brief Classes for SipHash message authentication code
|
|
//! \details SipHash computes a 64-bit or 128-bit message authentication code from a variable-length
|
|
//! message and 128-bit secret key. It was designed to be efficient even for short inputs, with
|
|
//! performance comparable to non-cryptographic hash functions.
|
|
//! \details To create a SipHash-2-4 object with a 64-bit MAC use code similar to the following.
|
|
//! <pre> SecByteBlock key(16);
|
|
//! prng.GenerateBlock(key, key.size());
|
|
//!
|
|
//! SipHash<2,4,false> hash(key, key.size());
|
|
//! hash.Update(...);
|
|
//! hash.Final(...);</pre>
|
|
//! \details To create a SipHash-2-4 object with a 128-bit MAC use code similar to the following.
|
|
//! <pre> SecByteBlock key(16);
|
|
//! prng.GenerateBlock(key, key.size());
|
|
//!
|
|
//! SipHash<2,4,true> hash(key, key.size());
|
|
//! hash.Update(...);
|
|
//! hash.Final(...);</pre>
|
|
//! \sa Jean-Philippe Aumasson and Daniel J. Bernstein <A HREF="http://131002.net/siphash/siphash.pdf">SipHash:
|
|
//! a fast short-input PRF</A>
|
|
//! \since Crypto++ 6.0
|
|
|
|
#ifndef CRYPTOPP_SIPHASH_H
|
|
#define CRYPTOPP_SIPHASH_H
|
|
|
|
#include "cryptlib.h"
|
|
#include "secblock.h"
|
|
#include "misc.h"
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
//! \class SipHash_Info
|
|
//! \brief SipHash message authentication code information
|
|
//! \tparam T_128bit flag indicating 128-bit (true) versus 64-bit (false) digest size
|
|
template <bool T_128bit>
|
|
class SipHash_Info : public FixedKeyLength<16>
|
|
{
|
|
public:
|
|
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "SipHash";}
|
|
CRYPTOPP_CONSTANT(DIGESTSIZE = (T_128bit ? 16 : 8))
|
|
};
|
|
|
|
//! \class SipHash_Base
|
|
//! \brief SipHash message authentication code base class
|
|
//! \tparam C the number of compression rounds
|
|
//! \tparam D the number of finalization rounds
|
|
//! \tparam T_128bit flag indicating 128-bit (true) versus 64-bit (false) digest size
|
|
template <unsigned int C, unsigned int D, bool T_128bit>
|
|
class SipHash_Base : public MessageAuthenticationCode, public SipHash_Info<T_128bit>
|
|
{
|
|
public:
|
|
static std::string StaticAlgorithmName() {
|
|
return std::string(SipHash_Info<T_128bit>::StaticAlgorithmName())+"-"+IntToString(C)+"-"+IntToString(D);
|
|
}
|
|
|
|
virtual ~SipHash_Base() {}
|
|
|
|
SipHash_Base() : m_idx(0) {}
|
|
|
|
virtual unsigned int DigestSize() const
|
|
{return SipHash_Info<T_128bit>::DIGESTSIZE;}
|
|
virtual size_t MinKeyLength() const
|
|
{return SipHash_Info<T_128bit>::MIN_KEYLENGTH;}
|
|
virtual size_t MaxKeyLength() const
|
|
{return SipHash_Info<T_128bit>::MAX_KEYLENGTH;}
|
|
virtual size_t DefaultKeyLength() const
|
|
{return SipHash_Info<T_128bit>::DEFAULT_KEYLENGTH;}
|
|
virtual size_t GetValidKeyLength(size_t keylength) const
|
|
{CRYPTOPP_UNUSED(keylength); return SipHash_Info<T_128bit>::DEFAULT_KEYLENGTH;}
|
|
virtual IV_Requirement IVRequirement() const
|
|
{return SimpleKeyingInterface::NOT_RESYNCHRONIZABLE;}
|
|
virtual unsigned int IVSize() const
|
|
{return 0;}
|
|
virtual unsigned int OptimalBlockSize() const
|
|
{return sizeof(word64);}
|
|
virtual unsigned int OptimalDataAlignment () const
|
|
{return GetAlignmentOf<word64>();}
|
|
|
|
virtual void Update(const byte *input, size_t length);
|
|
virtual void TruncatedFinal(byte *digest, size_t digestSize);
|
|
|
|
protected:
|
|
|
|
virtual void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms);
|
|
virtual void Restart();
|
|
|
|
inline void SIPROUND()
|
|
{
|
|
m_v[0] += m_v[1];
|
|
m_v[1] = rotlConstant<13>(m_v[1]);
|
|
m_v[1] ^= m_v[0];
|
|
m_v[0] = rotlConstant<32>(m_v[0]);
|
|
m_v[2] += m_v[3];
|
|
m_v[3] = rotlConstant<16>(m_v[3]);
|
|
m_v[3] ^= m_v[2];
|
|
m_v[0] += m_v[3];
|
|
m_v[3] = rotlConstant<21>(m_v[3]);
|
|
m_v[3] ^= m_v[0];
|
|
m_v[2] += m_v[1];
|
|
m_v[1] = rotlConstant<17>(m_v[1]);
|
|
m_v[1] ^= m_v[2];
|
|
m_v[2] = rotlConstant<32>(m_v[2]);
|
|
}
|
|
|
|
private:
|
|
FixedSizeSecBlock<word64, 4> m_v;
|
|
FixedSizeSecBlock<word64, 2> m_k;
|
|
FixedSizeSecBlock<word64, 2> m_b;
|
|
|
|
// Tail bytes
|
|
FixedSizeSecBlock<byte, 8> m_acc;
|
|
size_t m_idx;
|
|
};
|
|
|
|
//! \class SipHash
|
|
//! \brief SipHash message authentication code
|
|
//! \tparam C the number of compression rounds
|
|
//! \tparam D the number of finalization rounds
|
|
//! \tparam T_128bit flag indicating 128-bit (true) versus 64-bit (false) digest size
|
|
//! \details SipHash computes a 64-bit or 128-bit message authentication code from a variable-length
|
|
//! message and 128-bit secret key. It was designed to be efficient even for short inputs, with
|
|
//! performance comparable to non-cryptographic hash functions.
|
|
//! \details To create a SipHash-2-4 object with a 64-bit MAC use code similar to the following.
|
|
//! <pre> SecByteBlock key(16);
|
|
//! prng.GenerateBlock(key, key.size());
|
|
//!
|
|
//! SipHash<2,4,false> hash(key, key.size());
|
|
//! hash.Update(...);
|
|
//! hash.Final(...);</pre>
|
|
//! \details To create a SipHash-2-4 object with a 128-bit MAC use code similar to the following.
|
|
//! <pre> SecByteBlock key(16);
|
|
//! prng.GenerateBlock(key, key.size());
|
|
//!
|
|
//! SipHash<2,4,true> hash(key, key.size());
|
|
//! hash.Update(...);
|
|
//! hash.Final(...);</pre>
|
|
//! \sa Jean-Philippe Aumasson and Daniel J. Bernstein <A HREF="http://131002.net/siphash/siphash.pdf">SipHash:
|
|
//! a fast short-input PRF</A>
|
|
//! \since Crypto++ 6.0
|
|
template <unsigned int C=2, unsigned int D=4, bool T_128bit=false>
|
|
class SipHash : public SipHash_Base<C, D, T_128bit>
|
|
{
|
|
public:
|
|
//! \brief Create a SipHash
|
|
SipHash()
|
|
{this->UncheckedSetKey(NULLPTR, 0, g_nullNameValuePairs);}
|
|
//! \brief Create a SipHash
|
|
//! \param key a byte array used to key the cipher
|
|
//! \param length the size of the byte array, in bytes
|
|
SipHash(const byte *key, unsigned int length)
|
|
{this->UncheckedSetKey(key, length, g_nullNameValuePairs);}
|
|
};
|
|
|
|
template <unsigned int C, unsigned int D, bool T_128bit>
|
|
void SipHash_Base<C,D,T_128bit>::Update(const byte *input, size_t length)
|
|
{
|
|
CRYPTOPP_ASSERT((input && length) || !length);
|
|
if (!length) return;
|
|
|
|
if (m_idx)
|
|
{
|
|
size_t head = STDMIN(size_t(8U-m_idx), length);
|
|
memcpy(m_acc+m_idx, input, head);
|
|
m_idx += head; input += head; length -= head;
|
|
|
|
if (m_idx == 8)
|
|
{
|
|
word64 m = GetWord<word64>(true, LITTLE_ENDIAN_ORDER, m_acc);
|
|
m_v[3] ^= m;
|
|
for (unsigned int i = 0; i < C; ++i)
|
|
SIPROUND();
|
|
|
|
m_v[0] ^= m;
|
|
m_b[0] += 8;
|
|
|
|
m_idx = 0;
|
|
}
|
|
}
|
|
|
|
while (length >= 8)
|
|
{
|
|
word64 m = GetWord<word64>(false, LITTLE_ENDIAN_ORDER, input);
|
|
m_v[3] ^= m;
|
|
for (unsigned int i = 0; i < C; ++i)
|
|
SIPROUND();
|
|
|
|
m_v[0] ^= m;
|
|
m_b[0] += 8;
|
|
|
|
input += 8;
|
|
length -= 8;
|
|
}
|
|
|
|
CRYPTOPP_ASSERT(length < 8);
|
|
size_t tail = length % 8;
|
|
if (tail)
|
|
{
|
|
memcpy(m_acc+m_idx, input, tail);
|
|
m_idx += tail;
|
|
}
|
|
}
|
|
|
|
template <unsigned int C, unsigned int D, bool T_128bit>
|
|
void SipHash_Base<C,D,T_128bit>::TruncatedFinal(byte *digest, size_t digestSize)
|
|
{
|
|
CRYPTOPP_ASSERT(digest); // Pointer is valid
|
|
|
|
ThrowIfInvalidTruncatedSize(digestSize);
|
|
|
|
// The high octet holds length and is digested mod 256
|
|
m_b[0] += m_idx; m_b[0] <<= 56U;
|
|
switch (m_idx)
|
|
{
|
|
case 7:
|
|
m_b[0] |= ((word64)m_acc[6]) << 48;
|
|
// fall through
|
|
case 6:
|
|
m_b[0] |= ((word64)m_acc[5]) << 40;
|
|
// fall through
|
|
case 5:
|
|
m_b[0] |= ((word64)m_acc[4]) << 32;
|
|
// fall through
|
|
case 4:
|
|
m_b[0] |= ((word64)m_acc[3]) << 24;
|
|
// fall through
|
|
case 3:
|
|
m_b[0] |= ((word64)m_acc[2]) << 16;
|
|
// fall through
|
|
case 2:
|
|
m_b[0] |= ((word64)m_acc[1]) << 8;
|
|
// fall through
|
|
case 1:
|
|
m_b[0] |= ((word64)m_acc[0]);
|
|
// fall through
|
|
case 0:
|
|
break;
|
|
}
|
|
|
|
m_v[3] ^= m_b[0];
|
|
|
|
for (unsigned int i=0; i<C; i++)
|
|
SIPROUND();
|
|
|
|
m_v[0] ^= m_b[0];
|
|
|
|
if (T_128bit)
|
|
m_v[2] ^= 0xee;
|
|
else
|
|
m_v[2] ^= 0xff;
|
|
|
|
for (unsigned int i=0; i<D; i++)
|
|
SIPROUND();
|
|
|
|
m_b[0] = m_v[0] ^ m_v[1] ^ m_v[2] ^ m_v[3];
|
|
m_b[0] = ConditionalByteReverse(LITTLE_ENDIAN_ORDER, m_b[0]);
|
|
|
|
if (T_128bit)
|
|
{
|
|
m_v[1] ^= 0xdd;
|
|
for (unsigned int i = 0; i<D; ++i)
|
|
SIPROUND();
|
|
|
|
m_b[1] = m_v[0] ^ m_v[1] ^ m_v[2] ^ m_v[3];
|
|
m_b[1] = ConditionalByteReverse(LITTLE_ENDIAN_ORDER, m_b[1]);
|
|
}
|
|
|
|
memcpy_s(digest, digestSize, m_b.begin(), STDMIN(digestSize, (size_t)SipHash_Info<T_128bit>::DIGESTSIZE));
|
|
Restart();
|
|
}
|
|
|
|
template <unsigned int C, unsigned int D, bool T_128bit>
|
|
void SipHash_Base<C,D,T_128bit>::UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms)
|
|
{
|
|
CRYPTOPP_UNUSED(params);
|
|
if (key && length)
|
|
{
|
|
m_k[0] = GetWord<word64>(false, LITTLE_ENDIAN_ORDER, key);
|
|
m_k[1] = GetWord<word64>(false, LITTLE_ENDIAN_ORDER, key+8);
|
|
}
|
|
else
|
|
{
|
|
// Avoid Coverity finding
|
|
m_k[0] = m_k[1] = 0;
|
|
}
|
|
Restart();
|
|
}
|
|
|
|
template <unsigned int C, unsigned int D, bool T_128bit>
|
|
void SipHash_Base<C,D,T_128bit>::Restart ()
|
|
{
|
|
m_v[0] = W64LIT(0x736f6d6570736575);
|
|
m_v[1] = W64LIT(0x646f72616e646f6d);
|
|
m_v[2] = W64LIT(0x6c7967656e657261);
|
|
m_v[3] = W64LIT(0x7465646279746573);
|
|
|
|
m_v[3] ^= m_k[1];
|
|
m_v[2] ^= m_k[0];
|
|
m_v[1] ^= m_k[1];
|
|
m_v[0] ^= m_k[0];
|
|
|
|
if (T_128bit)
|
|
{
|
|
m_v[1] ^= 0xee;
|
|
}
|
|
|
|
m_idx = 0;
|
|
m_b[0] = 0;
|
|
}
|
|
|
|
NAMESPACE_END
|
|
|
|
#endif // CRYPTOPP_SIPHASH_H
|