Crypto++
oaep.h
1 #ifndef CRYPTOPP_OAEP_H
2 #define CRYPTOPP_OAEP_H
3 
4 #include "pubkey.h"
5 #include "sha.h"
6 
7 NAMESPACE_BEGIN(CryptoPP)
8 
9 //! _
10 class CRYPTOPP_DLL OAEP_Base : public PK_EncryptionMessageEncodingMethod
11 {
12 public:
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 
18 protected:
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
25 template <class H, class MGF=P1363_MGF1>
26 class OAEP : public OAEP_Base, public EncryptionStandard
27 {
28 public:
29  static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string("OAEP-") + MGF::StaticAlgorithmName() + "(" + H::StaticAlgorithmName() + ")";}
31 
32 protected:
33  unsigned int DigestSize() const {return H::DIGESTSIZE;}
34  HashTransformation * NewHash() const {return new H;}
35  MaskGeneratingFunction * NewMGF() const {return new MGF;}
36 };
37 
38 CRYPTOPP_DLL_TEMPLATE_CLASS OAEP<SHA>;
39 
40 NAMESPACE_END
41 
42 #endif
_
Definition: oaep.h:10
This file contains helper classes/functions for implementing public key algorithms.
message encoding method for public key encryption
Definition: pubkey.h:104
interface for random number generators
Definition: cryptlib.h:668
used to return decoding results
Definition: cryptlib.h:197
const char * EncodingParameters()
ConstByteArrayParameter.
Definition: argnames.h:60
Base class for public key encryption standard classes. These classes are used to select from variants...
Definition: pubkey.h:1597
interface for hash functions and data processing part of MACs
Definition: cryptlib.h:530
EME-OAEP, for use with classes derived from TF_ES
Definition: oaep.h:26
interface for retrieving values given their names
Definition: cryptlib.h:224