Crypto++ 8.9 Free C++ class library of cryptographic schemes

rc2.h
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1 // rc2.h - originally written and placed in the public domain by Wei Dai
2
3 /// \file rc2.h
4 /// \brief Classes for the RC2 block cipher
5 /// \since Crypto++ 3.0
6
7 #ifndef CRYPTOPP_RC2_H
8 #define CRYPTOPP_RC2_H
9
10 #include "seckey.h"
11 #include "secblock.h"
12 #include "algparam.h"
13
14 NAMESPACE_BEGIN(CryptoPP)
15
16 /// \brief RC2 block cipher information
17 /// \since Crypto++ 3.0
18 struct RC2_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 1, 128>
19 {
20 CRYPTOPP_CONSTANT(DEFAULT_EFFECTIVE_KEYLENGTH = 1024);
21 CRYPTOPP_CONSTANT(MAX_EFFECTIVE_KEYLENGTH = 1024);
22 CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "RC2";}
23 };
24
25 /// \brief RC2 block cipher
26 /// \sa <a href="http://www.cryptopp.com/wiki/RC2">RC2</a> on the Crypto Lounge.
27 /// \since Crypto++ 3.0
28 class RC2 : public RC2_Info, public BlockCipherDocumentation
29 {
30 /// \brief Class specific methods used to operate the cipher.
31 /// \details Implementations and overrides in \p Base apply to both \p ENCRYPTION and \p DECRYPTION directions
32 class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<RC2_Info>
33 {
34 public:
35 void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
36 unsigned int OptimalDataAlignment() const {return GetAlignmentOf<word16>();}
37
38 protected:
39 FixedSizeSecBlock<word16, 64> K; // expanded key table
40 };
41
42 /// \brief Class specific methods used to operate the cipher in the forward direction.
43 /// \details Implementations and overrides in \p Enc apply to \p ENCRYPTION.
44 class CRYPTOPP_NO_VTABLE Enc : public Base
45 {
46 public:
47 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
48 };
49
50 /// \brief Class specific methods used to operate the cipher in the reverse direction.
51 /// \details Implementations and overrides in \p Dec apply to \p DECRYPTION.
52 class CRYPTOPP_NO_VTABLE Dec : public Base
53 {
54 public:
55 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
56 };
57
58 public:
59
60 /// \brief Class specific methods used to operate the cipher in the forward direction.
61 /// \details Implementations and overrides in \p Encryption apply to \p ENCRYPTION.
62 class Encryption : public BlockCipherFinal<ENCRYPTION, Enc>
63 {
64 public:
65 Encryption() {}
66 Encryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)
67 {SetKey(key, keyLen);}
68 Encryption(const byte *key, size_t keyLen, int effectiveKeyLen)
69 {SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}
70 };
71
72 /// \brief Class specific methods used to operate the cipher in the reverse direction.
73 /// \details Implementations and overrides in \p Decryption apply to \p DECRYPTION.
74 class Decryption : public BlockCipherFinal<DECRYPTION, Dec>
75 {
76 public:
77 Decryption() {}
78 Decryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)
79 {SetKey(key, keyLen);}
80 Decryption(const byte *key, size_t keyLen, int effectiveKeyLen)
81 {SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}
82 };
83 };
84
85 typedef RC2::Encryption RC2Encryption;
86 typedef RC2::Decryption RC2Decryption;
87
88 NAMESPACE_END
89
90 #endif
algparam.h
Classes for working with NameValuePairs.
MakeParameters
AlgorithmParameters MakeParameters(const char *name, const T &value, bool throwIfNotUsed=true)
Create an object that implements NameValuePairs.
Definition: algparam.h:508
BlockCipherFinal
Provides class member functions to key a block cipher.
Definition: seckey.h:318
BlockCipherImpl
Provides a base implementation of Algorithm and SimpleKeyingInterface for block ciphers.
Definition: seckey.h:306
FixedBlockSize
Inherited by algorithms with fixed block size.
Definition: seckey.h:41
FixedSizeSecBlock< word16, 64 >
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:327
RC2::Decryption
Class specific methods used to operate the cipher in the reverse direction.
Definition: rc2.h:75
RC2::Encryption
Class specific methods used to operate the cipher in the forward direction.
Definition: rc2.h:63
RC2
RC2 block cipher.
Definition: rc2.h:29
VariableKeyLength
Inherited by keyed algorithms with variable key length.
Definition: seckey.h:166
VariableKeyLength< 16, 1, 128 >::DEFAULT_KEYLENGTH
static const int DEFAULT_KEYLENGTH
The default key length used by the algorithm provided as a constant.
Definition: seckey.h:184
CryptoPP
Crypto++ library namespace.
secblock.h
Classes and functions for secure memory allocations.
seckey.h
Classes and functions for implementing secret key algorithms.
BlockCipherDocumentation
Provides Encryption and Decryption typedefs used by derived classes to implement a block cipher.
Definition: seckey.h:399
RC2_Info
RC2 block cipher information.
Definition: rc2.h:19