oaep.h

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// oaep.h - originally written and placed in the public domain by Wei Dai
 
 
#ifndef CRYPTOPP_OAEP_H
#define CRYPTOPP_OAEP_H
 
#include "cryptlib.h"
#include "pubkey.h"
#include "sha.h"
 
NAMESPACE_BEGIN(CryptoPP)
 
 
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 &parameters) const;
        DecodingResult Unpad(const byte *padded, size_t paddedLength, byte *raw, const NameValuePairs &parameters) const;
 
protected:
        virtual unsigned int DigestSize() const =0;
        virtual HashTransformation * NewHash() const =0;
        virtual MaskGeneratingFunction * NewMGF() const =0;
};
 
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