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# oaep.h

    00001 #ifndef CRYPTOPP_OAEP_H
    00002 #define CRYPTOPP_OAEP_H
    00003
    00004 #include "pubkey.h"
    00005 #include "sha.h"
    00006
    00007 NAMESPACE_BEGIN(CryptoPP)
    00008
    00009 //! _
    00010 class CRYPTOPP_DLL OAEP_Base : public PK_EncryptionMessageEncodingMethod
    00011 {
    00012 public:
    00013         bool ParameterSupported(const char *name) const {return strcmp(name, Name::EncodingParameters()) == 0;}
    00014         unsigned int MaxUnpaddedLength(unsigned int paddedLength) const;
    00015         void Pad(RandomNumberGenerator &rng, const byte *raw, unsigned int inputLength, byte *padded, unsigned int paddedLength, const NameValuePairs &parameters) const;
    00016         DecodingResult Unpad(const byte *padded, unsigned int paddedLength, byte *raw, const NameValuePairs &parameters) const;
    00017
    00018 protected:
    00019         virtual unsigned int DigestSize() const =0;
    00020         virtual HashTransformation * NewHash() const =0;
    00021         virtual MaskGeneratingFunction * NewMGF() const =0;
    00022 };
    00023
    00024 //! <a href="http://www.weidai.com/scan-mirror/ca.html#cem_OAEP-MGF1">EME-OAEP</a>, for use with classes derived from TF_ES
    00025 template <class H, class MGF=P1363_MGF1>
    00026 class OAEP : public OAEP_Base, public EncryptionStandard
    00027 {
    00028 public:
    00029         static std::string StaticAlgorithmName() {return std::string("OAEP-") + MGF::StaticAlgorithmName() + "(" + H::StaticAlgorithmName() + ")";}
    00030         typedef OAEP<H, MGF> EncryptionMessageEncodingMethod;
    00031
    00032 protected:
    00033         unsigned int DigestSize() const {return H::DIGESTSIZE;}
    00034         HashTransformation * NewHash() const {return new H;}
    00035         MaskGeneratingFunction * NewMGF() const {return new MGF;}
    00036 };
    00037
    00038 CRYPTOPP_DLL_TEMPLATE_CLASS OAEP<SHA>;
    00039
    00040 NAMESPACE_END
    00041
    00042 #endif