1#ifndef CRYPTOPP_OAEP_H
2#define CRYPTOPP_OAEP_H
3
4#include "pubkey.h"
5#include "sha.h"
6
7NAMESPACE_BEGIN(CryptoPP)
8
9//! _
10class CRYPTOPP_DLL OAEP_Base : public PK_EncryptionMessageEncodingMethod
11{
12public:
13	bool ParameterSupported(const char *name) const {return strcmp(name, Name::EncodingParameters()) == 0;}
14	size_t MaxUnpaddedLength(size_t paddedLength) const;
15	void Pad(RandomNumberGenerator &rng, const byte *raw, size_t inputLength, byte *padded, size_t paddedLength, const NameValuePairs &parameters) const;
16	DecodingResult Unpad(const byte *padded, size_t paddedLength, byte *raw, const NameValuePairs &parameters) const;
17
18protected:
19	virtual unsigned int DigestSize() const =0;
20	virtual HashTransformation * NewHash() const =0;
21	virtual MaskGeneratingFunction * NewMGF() const =0;
22};
23
24//! <a href="http://www.weidai.com/scan-mirror/ca.html#cem_OAEP-MGF1">EME-OAEP</a>, for use with classes derived from TF_ES
25template <class H, class MGF=P1363_MGF1>
26class OAEP : public OAEP_Base, public EncryptionStandard
27{
28public:
29	static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string("OAEP-") + MGF::StaticAlgorithmName() + "(" + H::StaticAlgorithmName() + ")";}
30	typedef OAEP<H, MGF> EncryptionMessageEncodingMethod;
31
32protected:
33	unsigned int DigestSize() const {return H::DIGESTSIZE;}
34	HashTransformation * NewHash() const {return new H;}
35	MaskGeneratingFunction * NewMGF() const {return new MGF;}
36};
37
38CRYPTOPP_DLL_TEMPLATE_CLASS OAEP<SHA>;
39
40NAMESPACE_END
41
42#endif
43