oaep.h
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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 &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;
};
/// \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
HashTransformation
Interface for hash functions and data processing part of MACs.
Definition: cryptlib.h:1113
MaskGeneratingFunction
Mask generation function interface.
Definition: pubkey.h:688
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:322
OAEP_Base
OAEP padding base class.
Definition: oaep.h:19
OAEP_Base::MaxUnpaddedLength
size_t MaxUnpaddedLength(size_t paddedLength) const
max size of unpadded message in bytes, given max size of padded message in bits (1 less than size of ...
OAEP
OAEP padding.
Definition: oaep.h:39
PK_EncryptionMessageEncodingMethod
Message encoding method for public key encryption.
Definition: pubkey.h:209
RandomNumberGenerator
Interface for random number generators.
Definition: cryptlib.h:1435
CRYPTOPP_API
#define CRYPTOPP_API
Win32 calling convention.
Definition: config_dll.h:119
CRYPTOPP_DLL_TEMPLATE_CLASS
#define CRYPTOPP_DLL_TEMPLATE_CLASS
Instantiate templates in a dynamic library.
Definition: config_dll.h:72
cryptlib.h
Abstract base classes that provide a uniform interface to this library.
CryptoPP
Crypto++ library namespace.
Name::Pad
const char * Pad()
bool
Definition: argnames.h:72
Name::EncodingParameters
const char * EncodingParameters()
ConstByteArrayParameter.
Definition: argnames.h:66
Name::DigestSize
const char * DigestSize()
int, in bytes
Definition: argnames.h:79
pubkey.h
This file contains helper classes/functions for implementing public key algorithms.
sha.h
Classes for SHA-1 and SHA-2 family of message digests.
DecodingResult
Returns a decoding results.
Definition: cryptlib.h:278
EncryptionStandard
Base class for public key encryption standard classes.
Definition: pubkey.h:2274