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// oaep.h - originally written and placed in the public domain by Wei Dai
/// \file oaep.h
/// \brief Classes for optimal asymmetric encryption padding
/// \since Crypto++ 2.1
#ifndef CRYPTOPP_OAEP_H
#define CRYPTOPP_OAEP_H
#include "cryptlib.h"
#include "pubkey.h"
#include "sha.h"
NAMESPACE_BEGIN(CryptoPP)
/// \brief OAEP padding base class
/// \since Crypto++ 2.1
class CRYPTOPP_DLL OAEP_Base : public PK_EncryptionMessageEncodingMethod
{
public:
bool ParameterSupported(const char *name) const {return strcmp(name, Name::EncodingParameters()) == 0;}
size_t MaxUnpaddedLength(size_t paddedLength) const;
void Pad(RandomNumberGenerator &rng, const byte *raw, size_t inputLength, byte *padded, size_t paddedLength, const NameValuePairs ¶meters) const;
DecodingResult Unpad(const byte *padded, size_t paddedLength, byte *raw, const NameValuePairs ¶meters) const;
protected:
virtual unsigned int DigestSize() const =0;
virtual HashTransformation * NewHash() const =0;
virtual MaskGeneratingFunction * NewMGF() const =0;
};
/// \brief OAEP padding
/// \tparam H HashTransformation derived class
/// \tparam MGF MaskGeneratingFunction derived class
/// \sa <a href="http://www.weidai.com/scan-mirror/ca.html#cem_OAEP-MGF1">EME-OAEP</a>, for use with classes derived from TF_ES
/// \since Crypto++ 2.1
template <class H, class MGF=P1363_MGF1>
class OAEP : public OAEP_Base, public EncryptionStandard
{
public:
static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string("OAEP-") + MGF::StaticAlgorithmName() + "(" + H::StaticAlgorithmName() + ")";}
typedef OAEP<H, MGF> EncryptionMessageEncodingMethod;
protected:
unsigned int DigestSize() const {return H::DIGESTSIZE;}
HashTransformation * NewHash() const {return new H;}
MaskGeneratingFunction * NewMGF() const {return new MGF;}
};
CRYPTOPP_DLL_TEMPLATE_CLASS OAEP<SHA1>;
NAMESPACE_END
#endif
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