Crypto++  5.6.4
Free C++ class library of cryptographic schemes
oaep.h
1 #ifndef CRYPTOPP_OAEP_H
2 #define CRYPTOPP_OAEP_H
3 
4 #include "cryptlib.h"
5 #include "pubkey.h"
6 #include "sha.h"
7 
8 NAMESPACE_BEGIN(CryptoPP)
9 
10 //! _
11 class CRYPTOPP_DLL OAEP_Base : public PK_EncryptionMessageEncodingMethod
12 {
13 public:
14  bool ParameterSupported(const char *name) const {return strcmp(name, Name::EncodingParameters()) == 0;}
15  size_t MaxUnpaddedLength(size_t paddedLength) const;
16  void Pad(RandomNumberGenerator &rng, const byte *raw, size_t inputLength, byte *padded, size_t paddedLength, const NameValuePairs &parameters) const;
17  DecodingResult Unpad(const byte *padded, size_t paddedLength, byte *raw, const NameValuePairs &parameters) const;
18 
19 protected:
20  virtual unsigned int DigestSize() const =0;
21  virtual HashTransformation * NewHash() const =0;
22  virtual MaskGeneratingFunction * NewMGF() const =0;
23 };
24 
25 //! <a href="http://www.weidai.com/scan-mirror/ca.html#cem_OAEP-MGF1">EME-OAEP</a>, for use with classes derived from TF_ES
26 template <class H, class MGF=P1363_MGF1>
27 class OAEP : public OAEP_Base, public EncryptionStandard
28 {
29 public:
30  static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string("OAEP-") + MGF::StaticAlgorithmName() + "(" + H::StaticAlgorithmName() + ")";}
32 
33 protected:
34  unsigned int DigestSize() const {return H::DIGESTSIZE;}
35  HashTransformation * NewHash() const {return new H;}
36  MaskGeneratingFunction * NewMGF() const {return new MGF;}
37 };
38 
39 CRYPTOPP_DLL_TEMPLATE_CLASS OAEP<SHA>;
40 
41 NAMESPACE_END
42 
43 #endif
const char * DigestSize()
int, in bytes
Definition: argnames.h:78
_
Definition: oaep.h:11
This file contains helper classes/functions for implementing public key algorithms.
Abstract base classes that provide a uniform interface to this library.
Message encoding method for public key encryption.
Definition: pubkey.h:221
Interface for random number generators.
Definition: cryptlib.h:1193
Returns a decoding results.
Definition: cryptlib.h:241
const char * EncodingParameters()
ConstByteArrayParameter.
Definition: argnames.h:65
Base class for public key encryption standard classes.
Definition: pubkey.h:2148
Mask generation function interface.
Definition: pubkey.h:688
Classes for SHA-1 and SHA-2 family of message digests.
Interface for hash functions and data processing part of MACs.
Definition: cryptlib.h:931
Crypto++ library namespace.
EME-OAEP, for use with classes derived from TF_ES
Definition: oaep.h:27
Interface for retrieving values given their names.
Definition: cryptlib.h:282