1 #ifndef _RIJNDAEL_H_ 2 #define _RIJNDAEL_H_ 3 4 // 5 // File : rijndael.h 6 // Creation date : Sun Nov 5 2000 03:21:05 CEST 7 // Author : Szymon Stefanek (stefanek (at) tin.it) 8 // 9 // Another implementation of the Rijndael cipher. 10 // This is intended to be an easily usable library file. 11 // This code is public domain. 12 // Based on the Vincent Rijmen and K.U.Leuven implementation 2.4. 13 // 14 15 // 16 // Original Copyright notice: 17 // 18 // rijndael-alg-fst.c v2.4 April '2000 19 // rijndael-alg-fst.h 20 // rijndael-api-fst.c 21 // rijndael-api-fst.h 22 // 23 // Optimised ANSI C code 24 // 25 // authors: v1.0: Antoon Bosselaers 26 // v2.0: Vincent Rijmen, K.U.Leuven 27 // v2.3: Paulo Barreto 28 // v2.4: Vincent Rijmen, K.U.Leuven 29 // 30 // This code is placed in the public domain. 31 // 32 33 // 34 // This implementation works on 128 , 192 , 256 bit keys 35 // and on 128 bit blocks 36 // 37 38 // 39 // Example of usage: 40 // 41 // // Input data 42 // unsigned char key[32]; // The key 43 // initializeYour256BitKey(); // Obviously initialized with sth 44 // const unsigned char * plainText = getYourPlainText(); // Your plain text 45 // int plainTextLen = strlen(plainText); // Plain text length 46 // 47 // // Encrypting 48 // Rijndael rin; 49 // unsigned char output[plainTextLen + 16]; 50 // 51 // rin.init(Rijndael::CBC,Rijndael::Encrypt,key,Rijndael::Key32Bytes); 52 // // It is a good idea to check the error code 53 // int len = rin.padEncrypt(plainText,len,output); 54 // if(len >= 0)useYourEncryptedText(); 55 // else encryptError(len); 56 // 57 // // Decrypting: we can reuse the same object 58 // unsigned char output2[len]; 59 // rin.init(Rijndael::CBC,Rijndael::Decrypt,key,Rijndael::Key32Bytes)); 60 // len = rin.padDecrypt(output,len,output2); 61 // if(len >= 0)useYourDecryptedText(); 62 // else decryptError(len); 63 // 64 65 #include "stdafx.h" 66 67 #define _MAX_KEY_COLUMNS (256/32) 68 #define _MAX_ROUNDS 14 69 #define MAX_IV_SIZE 16 70 71 // We assume that unsigned int is 32 bits long.... 72 //typedef unsigned char uint8_t; 73 //typedef unsigned int uint32_t; 74 //typedef unsigned short uint16_t; 75 76 // Error codes 77 #define RIJNDAEL_SUCCESS 0 78 #define RIJNDAEL_UNSUPPORTED_MODE -1 79 #define RIJNDAEL_UNSUPPORTED_DIRECTION -2 80 #define RIJNDAEL_UNSUPPORTED_KEY_LENGTH -3 81 #define RIJNDAEL_BAD_KEY -4 82 #define RIJNDAEL_NOT_INITIALIZED -5 83 #define RIJNDAEL_BAD_DIRECTION -6 84 #define RIJNDAEL_CORRUPTED_DATA -7 85 86 class Rijndael 87 { 88 public: 89 enum Direction { Encrypt , Decrypt }; 90 enum Mode { ECB , CBC , CFB1 }; 91 enum KeyLength { Key16Bytes , Key24Bytes , Key32Bytes }; 92 // 93 // Creates a Rijndael cipher object 94 // You have to call init() before you can encrypt or decrypt stuff 95 // 96 Rijndael(); 97 ~Rijndael(); 98 protected: 99 // Internal stuff 100 enum State { Valid , Invalid }; 101 102 State m_state; 103 Mode m_mode; 104 Direction m_direction; 105 uint8_t m_initVector[MAX_IV_SIZE]; 106 uint32_t m_uRounds; 107 uint8_t m_expandedKey[_MAX_ROUNDS+1][4][4]; 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 int init(Mode mode,Direction dir,const uint8_t *key,KeyLength keyLen,uint8_t * initVector = 0); 128 // Encrypts the input array (can be binary data) 129 // The input array length must be a multiple of 16 bytes, the remaining part 130 // is DISCARDED. 131 // so it actually encrypts inputLen / 128 blocks of input and puts it in outBuffer 132 // Input len is in BITS! 133 // outBuffer must be at least inputLen / 8 bytes long. 134 // Returns the encrypted buffer length in BITS or an error code < 0 in case of error 135 int blockEncrypt(const uint8_t *input, int inputLen, uint8_t *outBuffer); 136 // Encrypts the input array (can be binary data) 137 // The input array can be any length , it is automatically padded on a 16 byte boundary. 138 // Input len is in BYTES! 139 // outBuffer must be at least (inputLen + 16) bytes long 140 // Returns the encrypted buffer length in BYTES or an error code < 0 in case of error 141 int padEncrypt(const uint8_t *input, int inputOctets, uint8_t *outBuffer); 142 // Decrypts the input vector 143 // Input len is in BITS! 144 // outBuffer must be at least inputLen / 8 bytes long 145 // Returns the decrypted buffer length in BITS and an error code < 0 in case of error 146 int blockDecrypt(const uint8_t *input, int inputLen, uint8_t *outBuffer); 147 // Decrypts the input vector 148 // Input len is in BYTES! 149 // outBuffer must be at least inputLen bytes long 150 // Returns the decrypted buffer length in BYTES and an error code < 0 in case of error 151 int padDecrypt(const uint8_t *input, int inputOctets, uint8_t *outBuffer); 152 protected: 153 void keySched(uint8_t key[_MAX_KEY_COLUMNS][4]); 154 void keyEncToDec(); 155 void encrypt(const uint8_t a[16], uint8_t b[16]); 156 void decrypt(const uint8_t a[16], uint8_t b[16]); 157 }; 158 159 #endif // _RIJNDAEL_H_ 160
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