Crypto++ 8.9
Free C++ class library of cryptographic schemes
hc256.h
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1// hc256.h - written and placed in the public domain by Jeffrey Walton
2// based on public domain code by Hongjun Wu.
3//
4// The reference materials and source files are available at
5// The eSTREAM Project, http://www.ecrypt.eu.org/stream/hc256.html.
6
7/// \file hc256.h
8/// \brief Classes for HC-256 stream cipher
9/// \sa <A HREF="http://www.ecrypt.eu.org/stream/hc256.html">The
10/// eSTREAM Project | HC-256</A> and
11/// <A HREF="https://www.cryptopp.com/wiki/HC-128">Crypto++ Wiki | HC-128</A>.
12/// \since Crypto++ 8.0
13
14#ifndef CRYPTOPP_HC256_H
15#define CRYPTOPP_HC256_H
16
17#include "strciphr.h"
18#include "secblock.h"
19
20NAMESPACE_BEGIN(CryptoPP)
21
22/// \brief HC-256 stream cipher information
23/// \since Crypto++ 8.0
24struct HC256Info : public FixedKeyLength<32, SimpleKeyingInterface::UNIQUE_IV, 32>
25{
26 CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() { return "HC-256"; }
27};
28
29/// \brief HC-256 stream cipher implementation
30/// \since Crypto++ 8.0
31class HC256Policy : public AdditiveCipherConcretePolicy<word32, 4>, public HC256Info
32{
33protected:
34 void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length);
35 void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount);
36 void CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length);
37 bool CanOperateKeystream() const { return true; }
38 bool CipherIsRandomAccess() const { return false; }
39
40 word32 H1(word32 u);
41 word32 H2(word32 u);
42
43 void GenerateKeystream(word32* keystream);
44 word32 Generate();
45
46private:
49 word32 m_P[1024];
50 word32 m_Q[1024];
51 word32 m_ctr;
52};
53
54/// \brief HC-256 stream cipher
55/// \details HC-256 is a stream cipher developed by Hongjun Wu. HC-256 is the
56/// successor to HC-128 from the eSTREAM project.
57/// \sa <A HREF="http://www.ecrypt.eu.org/stream/hc256.html">The
58/// eSTREAM Project | HC-256</A> and
59/// <A HREF="https://www.cryptopp.com/wiki/HC-128">Crypto++ Wiki | HC-128</A>.
60/// \since Crypto++ 8.0
66
67NAMESPACE_END
68
69#endif // CRYPTOPP_HC256_H
Inherited by keyed algorithms with fixed key length.
Definition seckey.h:125
Fixed size stack-based SecBlock.
Definition secblock.h:1246
HC-256 stream cipher implementation.
Definition hc256.h:32
Interface for retrieving values given their names.
Definition cryptlib.h:327
Interface for algorithms that take byte strings as keys.
Definition cryptlib.h:647
SymmetricCipher implementation.
Definition strciphr.h:684
unsigned int word32
32-bit unsigned datatype
Definition config_int.h:72
Crypto++ library namespace.
Classes and functions for secure memory allocations.
Classes for implementing stream ciphers.
KeystreamOperation
Keystream operation flags.
Definition strciphr.h:88
Base class for additive stream ciphers.
Definition strciphr.h:202
HC-256 stream cipher.
Definition hc256.h:62
HC-256 stream cipher information.
Definition hc256.h:25
Provides Encryption and Decryption typedefs used by derived classes to implement a symmetric cipher.
Definition seckey.h:414