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#ifndef CRYPTOPP_OAEP_H
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#define CRYPTOPP_OAEP_H
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#include "pubkey.h"
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#include "sha.h"
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NAMESPACE_BEGIN(CryptoPP)
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//! _
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class CRYPTOPP_DLL OAEP_Base : public PK_EncryptionMessageEncodingMethod
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{
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public:
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bool ParameterSupported(const char *name) const {return strcmp(name, Name::EncodingParameters()) == 0;}
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size_t MaxUnpaddedLength(size_t paddedLength) const;
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void Pad(RandomNumberGenerator &rng, const byte *raw, size_t inputLength, byte *padded, size_t paddedLength, const NameValuePairs ¶meters) const;
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DecodingResult Unpad(const byte *padded, size_t paddedLength, byte *raw, const NameValuePairs ¶meters) const;
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protected:
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virtual unsigned int DigestSize() const =0;
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virtual HashTransformation * NewHash() const =0;
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virtual MaskGeneratingFunction * NewMGF() const =0;
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};
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//! <a href="http://www.weidai.com/scan-mirror/ca.html#cem_OAEP-MGF1">EME-OAEP</a>, for use with classes derived from TF_ES
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template <class H, class MGF=P1363_MGF1>
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class OAEP : public OAEP_Base, public EncryptionStandard
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{
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public:
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static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string("OAEP-") + MGF::StaticAlgorithmName() + "(" + H::StaticAlgorithmName() + ")";}
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typedef OAEP<H, MGF> EncryptionMessageEncodingMethod;
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protected:
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unsigned int DigestSize() const {return H::DIGESTSIZE;}
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HashTransformation * NewHash() const {return new H;}
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MaskGeneratingFunction * NewMGF() const {return new MGF;}
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};
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CRYPTOPP_DLL_TEMPLATE_CLASS OAEP<SHA>;
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NAMESPACE_END
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#endif
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