62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
// hmac.h - written and placed in the public domain by Wei Dai
|
|
|
|
#ifndef CRYPTOPP_HMAC_H
|
|
#define CRYPTOPP_HMAC_H
|
|
|
|
#include "seckey.h"
|
|
#include "secblock.h"
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
//! _
|
|
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE HMAC_Base : public VariableKeyLength<16, 0, INT_MAX>, public MessageAuthenticationCode
|
|
{
|
|
public:
|
|
HMAC_Base() : m_innerHashKeyed(false) {}
|
|
void UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs ¶ms);
|
|
|
|
void Restart();
|
|
void Update(const byte *input, size_t length);
|
|
void TruncatedFinal(byte *mac, size_t size);
|
|
unsigned int OptimalBlockSize() const {return const_cast<HMAC_Base*>(this)->AccessHash().OptimalBlockSize();}
|
|
unsigned int DigestSize() const {return const_cast<HMAC_Base*>(this)->AccessHash().DigestSize();}
|
|
|
|
protected:
|
|
virtual HashTransformation & AccessHash() =0;
|
|
byte * AccessIpad() {return m_buf;}
|
|
byte * AccessOpad() {return m_buf + AccessHash().BlockSize();}
|
|
byte * AccessInnerHash() {return m_buf + 2*AccessHash().BlockSize();}
|
|
|
|
private:
|
|
void KeyInnerHash();
|
|
|
|
SecByteBlock m_buf;
|
|
bool m_innerHashKeyed;
|
|
};
|
|
|
|
//! <a href="http://www.weidai.com/scan-mirror/mac.html#HMAC">HMAC</a>
|
|
/*! HMAC(K, text) = H(K XOR opad, H(K XOR ipad, text)) */
|
|
template <class T>
|
|
class HMAC : public MessageAuthenticationCodeImpl<HMAC_Base, HMAC<T> >
|
|
{
|
|
public:
|
|
CRYPTOPP_CONSTANT(DIGESTSIZE=T::DIGESTSIZE)
|
|
CRYPTOPP_CONSTANT(BLOCKSIZE=T::BLOCKSIZE)
|
|
|
|
HMAC() {}
|
|
HMAC(const byte *key, size_t length=HMAC_Base::DEFAULT_KEYLENGTH)
|
|
{this->SetKey(key, length);}
|
|
|
|
static std::string StaticAlgorithmName() {return std::string("HMAC(") + T::StaticAlgorithmName() + ")";}
|
|
std::string AlgorithmName() const {return std::string("HMAC(") + m_hash.AlgorithmName() + ")";}
|
|
|
|
private:
|
|
HashTransformation & AccessHash() {return m_hash;}
|
|
|
|
T m_hash;
|
|
};
|
|
|
|
NAMESPACE_END
|
|
|
|
#endif
|