1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
// seal.h - originally written and placed in the public domain by Wei Dai
/// \file seal.h
/// \brief Classes for SEAL stream cipher
/// \since Crypto++ 2.2
#ifndef CRYPTOPP_SEAL_H
#define CRYPTOPP_SEAL_H
#include "strciphr.h"
#include "secblock.h"
NAMESPACE_BEGIN(CryptoPP)
/// \brief SEAL stream cipher information
/// \tparam B Endianness of the stream cipher
/// \since Crypto++ 2.2
template <class B = BigEndian>
struct SEAL_Info : public FixedKeyLength<20, SimpleKeyingInterface::INTERNALLY_GENERATED_IV, 4>
{
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return B::ToEnum() == LITTLE_ENDIAN_ORDER ? "SEAL-3.0-LE" : "SEAL-3.0-BE";}
};
/// \brief SEAL stream cipher operation
/// \tparam B Endianness of the stream cipher
/// \since Crypto++ 2.2
template <class B = BigEndian>
class CRYPTOPP_NO_VTABLE SEAL_Policy : public AdditiveCipherConcretePolicy<word32, 256>, public SEAL_Info<B>
{
protected:
void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length);
void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount);
void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length);
bool CipherIsRandomAccess() const {return true;}
void SeekToIteration(lword iterationCount);
private:
FixedSizeSecBlock<word32, 512> m_T;
FixedSizeSecBlock<word32, 256> m_S;
SecBlock<word32> m_R;
word32 m_startCount, m_iterationsPerCount;
word32 m_outsideCounter, m_insideCounter;
};
/// \brief SEAL stream cipher
/// \tparam B Endianness of the stream cipher
/// \sa <a href="http://www.cryptopp.com/wiki/SEAL-3.0-BE">SEAL</a>
/// \since Crypto++ 2.2
template <class B = BigEndian>
struct SEAL : public SEAL_Info<B>, public SymmetricCipherDocumentation
{
typedef SymmetricCipherFinal<ConcretePolicyHolder<SEAL_Policy<B>, AdditiveCipherTemplate<> >, SEAL_Info<B> > Encryption;
typedef Encryption Decryption;
};
NAMESPACE_END
#endif
|
