source: examples/munge/lib/rijndael.h @ 5959435

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Last change on this file since 5959435 was 5959435, checked in by Perry Lorier <perry@…>, 16 years ago

Add new munge program to the libtrace examples

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1#ifndef _RIJNDAEL_H_
2#define _RIJNDAEL_H_
3
4// $Id$
5//
6// File : rijndael.h
7// Creation date : Sun Nov 5 2000 03:21:05 CEST
8// Author : Szymon Stefanek (stefanek@tin.it)
9//
10// Another implementation of the Rijndael cipher.
11// This is intended to be an easily usable library file.
12// This code is public domain.
13// Based on the Vincent Rijmen and K.U.Leuven implementation 2.4.
14//
15
16//
17// Original Copyright notice:
18//
19//    rijndael-alg-fst.c   v2.4   April '2000
20//    rijndael-alg-fst.h
21//    rijndael-api-fst.c
22//    rijndael-api-fst.h
23//
24//    Optimised ANSI C code
25//
26//    authors: v1.0: Antoon Bosselaers
27//             v2.0: Vincent Rijmen, K.U.Leuven
28//             v2.3: Paulo Barreto
29//             v2.4: Vincent Rijmen, K.U.Leuven
30//
31//    This code is placed in the public domain.
32//
33
34//
35// This implementation works on 128 , 192 , 256 bit keys
36// and on 128 bit blocks
37//
38
39//
40// Example of usage:
41//
42//  // Input data
43//  unsigned char key[32];                       // The key
44//  initializeYour256BitKey();                   // Obviously initialized with sth
45//  const unsigned char * plainText = getYourPlainText(); // Your plain text
46//  int plainTextLen = strlen(plainText);        // Plain text length
47//
48//  // Encrypting
49//  Rijndael rin;
50//  unsigned char output[plainTextLen + 16];
51//
52//  rin.init(Rijndael::CBC,Rijndael::Encrypt,key,Rijndael::Key32Bytes);
53//  // It is a good idea to check the error code
54//  int len = rin.padEncrypt(plainText,len,output);
55//  if(len >= 0)useYourEncryptedText();
56//  else encryptError(len);
57//
58//  // Decrypting: we can reuse the same object
59//  unsigned char output2[len];
60//  rin.init(Rijndael::CBC,Rijndael::Decrypt,key,Rijndael::Key32Bytes));
61//  len = rin.padDecrypt(output,len,output2);
62//  if(len >= 0)useYourDecryptedText();
63//  else decryptError(len);
64//
65
66#define _MAX_KEY_COLUMNS (256/32)
67#define _MAX_ROUNDS      14
68#define MAX_IV_SIZE      16
69
70// We assume that unsigned int is 32 bits long....
71typedef unsigned char  UINT8;
72typedef unsigned int   UINT32;
73typedef unsigned short UINT16;
74
75// Error codes
76#define RIJNDAEL_SUCCESS 0
77#define RIJNDAEL_UNSUPPORTED_MODE -1
78#define RIJNDAEL_UNSUPPORTED_DIRECTION -2
79#define RIJNDAEL_UNSUPPORTED_KEY_LENGTH -3
80#define RIJNDAEL_BAD_KEY -4
81#define RIJNDAEL_NOT_INITIALIZED -5
82#define RIJNDAEL_BAD_DIRECTION -6
83#define RIJNDAEL_CORRUPTED_DATA -7
84
85//class Rijndael
86//{     
87//public:
88
89enum Direction_e { Encrypt , Decrypt };
90enum Mode_e { ECB , CBC , CFB1 };
91enum KeyLength_e { Key16Bytes , Key24Bytes , Key32Bytes };
92enum State_e { Valid , Invalid };
93
94typedef enum Mode_e Mode;
95typedef enum Direction_e Direction;
96typedef enum KeyLength_e KeyLength;
97typedef enum State_e State;
98
99//
100// Creates a Rijndael cipher object
101// You have to call init() before you can encrypt or decrypt stuff
102//
103//      Rijndael();
104//      ~Rijndael();
105//protected:
106//      // Internal stuff
107
108//public:
109        //////////////////////////////////////////////////////////////////////////////////////////
110        // API
111        //////////////////////////////////////////////////////////////////////////////////////////
112
113        // init(): Initializes the crypt session
114        // Returns RIJNDAEL_SUCCESS or an error code
115        // mode      : Rijndael::ECB, Rijndael::CBC or Rijndael::CFB1
116        //             You have to use the same mode for encrypting and decrypting
117        // dir       : Rijndael::Encrypt or Rijndael::Decrypt
118        //             A cipher instance works only in one direction
119        //             (Well , it could be easily modified to work in both
120        //             directions with a single init() call, but it looks
121        //             useless to me...anyway , it is a matter of generating
122        //             two expanded keys)
123        // key       : array of unsigned octets , it can be 16 , 24 or 32 bytes long
124        //             this CAN be binary data (it is not expected to be null terminated)
125        // keyLen    : Rijndael::Key16Bytes , Rijndael::Key24Bytes or Rijndael::Key32Bytes
126        // initVector: initialization vector, you will usually use 0 here
127
128int rijndael_init(Mode mode, Direction dir, const UINT8 *key, KeyLength keyLen, UINT8 * initVector);
129
130  // Encrypts the input array (can be binary data)
131        // The input array length must be a multiple of 16 bytes, the remaining part
132        // is DISCARDED.
133        // so it actually encrypts inputLen / 128 blocks of input and puts it in outBuffer
134        // Input len is in BITS!
135        // outBuffer must be at least inputLen / 8 bytes long.
136        // Returns the encrypted buffer length in BITS or an error code < 0 in case of error
137int blockEncrypt(const UINT8 *input, int inputLen, UINT8 *outBuffer);
138        // Encrypts the input array (can be binary data)
139        // The input array can be any length , it is automatically padded on a 16 byte boundary.
140        // Input len is in BYTES!
141        // outBuffer must be at least (inputLen + 16) bytes long
142        // Returns the encrypted buffer length in BYTES or an error code < 0 in case of error
143int padEncrypt(const UINT8 *input, int inputOctets, UINT8 *outBuffer);
144        // Decrypts the input vector
145        // Input len is in BITS!
146        // outBuffer must be at least inputLen / 8 bytes long
147        // Returns the decrypted buffer length in BITS and an error code < 0 in case of error
148int blockDecrypt(const UINT8 *input, int inputLen, UINT8 *outBuffer);
149        // Decrypts the input vector
150        // Input len is in BYTES!
151        // outBuffer must be at least inputLen bytes long
152        // Returns the decrypted buffer length in BYTES and an error code < 0 in case of error
153int padDecrypt(const UINT8 *input, int inputOctets, UINT8 *outBuffer);
154//protected:
155void keySched(UINT8 key[_MAX_KEY_COLUMNS][4]);
156void keyEncToDec();
157void encrypt(const UINT8 a[16], UINT8 b[16]);
158void decrypt(const UINT8 a[16], UINT8 b[16]);
159//};
160       
161#endif // _RIJNDAEL_H_
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