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#ifndef CRYPTOPP_PANAMA_H
#define CRYPTOPP_PANAMA_H
#include "seckey.h"
#include "secblock.h"
#include "iterhash.h"
#include "strciphr.h"
NAMESPACE_BEGIN(CryptoPP)
/// base class, do not use directly
template <class B>
class CRYPTOPP_NO_VTABLE Panama
{
public:
void Reset();
void Iterate(unsigned int count, const word32 *p=NULL, word32 *z=NULL, const word32 *y=NULL);
protected:
typedef word32 Stage[8];
enum {STAGES = 32};
FixedSizeSecBlock<word32, 17*2 + STAGES*sizeof(Stage)> m_state;
unsigned int m_bstart;
};
/// <a href="http://www.weidai.com/scan-mirror/md.html#Panama">Panama Hash</a>
template <class B = LittleEndian>
class PanamaHash : protected Panama<B>, public AlgorithmImpl<IteratedHash<word32, NativeByteOrder, 32>, PanamaHash<B> >
{
public:
enum {DIGESTSIZE = 32};
PanamaHash() {Panama<B>::Reset();}
unsigned int DigestSize() const {return DIGESTSIZE;}
void TruncatedFinal(byte *hash, unsigned int size);
static const char * StaticAlgorithmName() {return B::ToEnum() == BIG_ENDIAN_ORDER ? "Panama-BE" : "Panama-LE";}
protected:
void Init() {Panama<B>::Reset();}
void HashEndianCorrectedBlock(const word32 *data) {this->Iterate(1, data);} // push
unsigned int HashMultipleBlocks(const word32 *input, unsigned int length);
};
//! MAC construction using a hermetic hash function
template <class T_Hash, class T_Info = T_Hash>
class HermeticHashFunctionMAC : public AlgorithmImpl<SimpleKeyingInterfaceImpl<TwoBases<MessageAuthenticationCode, VariableKeyLength<32, 0, UINT_MAX> > >, T_Info>
{
public:
void SetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms = g_nullNameValuePairs)
{
m_key.Assign(key, length);
Restart();
}
void Restart()
{
m_hash.Restart();
m_keyed = false;
}
void Update(const byte *input, unsigned int length)
{
if (!m_keyed)
KeyHash();
m_hash.Update(input, length);
}
void TruncatedFinal(byte *digest, unsigned int digestSize)
{
if (!m_keyed)
KeyHash();
m_hash.TruncatedFinal(digest, digestSize);
m_keyed = false;
}
unsigned int DigestSize() const
{return m_hash.DigestSize();}
unsigned int BlockSize() const
{return m_hash.BlockSize();}
unsigned int OptimalBlockSize() const
{return m_hash.OptimalBlockSize();}
unsigned int OptimalDataAlignment() const
{return m_hash.OptimalDataAlignment();}
protected:
void KeyHash()
{
m_hash.Update(m_key, m_key.size());
m_keyed = true;
}
T_Hash m_hash;
bool m_keyed;
SecByteBlock m_key;
};
/// Panama MAC
template <class B = LittleEndian>
class PanamaMAC : public HermeticHashFunctionMAC<PanamaHash<B> >
{
public:
PanamaMAC() {}
PanamaMAC(const byte *key, unsigned int length)
{this->SetKey(key, length);}
};
//! algorithm info
template <class B>
struct PanamaCipherInfo : public VariableKeyLength<32, 32, 64, 32, SimpleKeyingInterface::NOT_RESYNCHRONIZABLE>
{
static const char * StaticAlgorithmName() {return B::ToEnum() == BIG_ENDIAN_ORDER ? "Panama-BE" : "Panama-LE";}
};
//! _
template <class B>
class PanamaCipherPolicy : public AdditiveCipherConcretePolicy<word32, 8>,
public PanamaCipherInfo<B>,
protected Panama<B>
{
protected:
void CipherSetKey(const NameValuePairs ¶ms, const byte *key, unsigned int length);
void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount);
bool IsRandomAccess() const {return false;}
};
//! <a href="http://www.weidai.com/scan-mirror/cs.html#Panama">Panama Stream Cipher</a>
template <class B = LittleEndian>
struct PanamaCipher : public PanamaCipherInfo<B>, public SymmetricCipherDocumentation
{
typedef SymmetricCipherFinal<ConcretePolicyHolder<PanamaCipherPolicy<B>, AdditiveCipherTemplate<> > > Encryption;
typedef Encryption Decryption;
};
NAMESPACE_END
#endif
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