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126 lines
4.5 KiB
C
126 lines
4.5 KiB
C
/// \file
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/// \brief \b [Internal] AES encoding / decoding
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/// rijndael-alg-fst.h v2.0 August '99
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/// Optimised ANSI C code
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/// taken from the 'aescrypt' project: www.sf.net/projects/aescrypt
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/// See LICENSE-EST for the license applicable to this file
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/// \note Although the routines claim to support 192 and 256 bit blocks,
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/// don't take your chances - stick to the 128 bit (16 byte) blocks unless
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/// you've run tests to prove that 192 and 256 are correctly supported.
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/// - Cirilo
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#include <stdio.h>
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#ifndef __RIJNDAEL_ALG_H
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#define __RIJNDAEL_ALG_H
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#define MAXKC (256/32)
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#define MAXROUNDS 14
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typedef unsigned char word8;
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typedef unsigned short word16;
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typedef unsigned int word32;
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int rijndaelKeySched (word8 k[MAXKC][4], int keyBits,
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word8 rk[MAXROUNDS+1][4][4]);
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int rijndaelKeyEnctoDec (int keyBits, word8 W[MAXROUNDS+1][4][4]);
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int rijndaelEncrypt (word8 a[16], word8 b[16],
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word8 rk[MAXROUNDS+1][4][4]);
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int rijndaelEncryptRound (word8 a[4][4],
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word8 rk[MAXROUNDS+1][4][4], int rounds);
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int rijndaelDecrypt (word8 a[16], word8 b[16],
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word8 rk[MAXROUNDS+1][4][4]);
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int rijndaelDecryptRound (word8 a[4][4],
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word8 rk[MAXROUNDS+1][4][4], int rounds);
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#endif
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// End of algorithm headers. begin the AES API header defs
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#ifndef __RIJNDAEL_API_H
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#define __RIJNDAEL_API_H
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// rijndael-api-fst.h v2.0 August '99
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// Optimised ANSI C code
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// Defines:
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// Add any additional defines you need
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#define DIR_ENCRYPT 0 // Are we encrpyting?
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#define DIR_DECRYPT 1 // Are we decrpyting?
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#define MODE_ECB 1 // Are we ciphering in ECB mode?
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#define MODE_CBC 2 // Are we ciphering in CBC mode?
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#define MODE_CFB1 3 // Are we ciphering in 1-bit CFB mode?
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef FALSE
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#define FALSE 0
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#endif
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#define BITSPERBLOCK 128 // Default number of bits in a cipher block
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// Error Codes - CHANGE POSSIBLE: inclusion of additional error codes
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#define BAD_KEY_DIR -1 // Key direction is invalid, e.g., unknown value
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#define BAD_KEY_MAT -2 // Key material not of correct length
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#define BAD_KEY_INSTANCE -3 // Key passed is not valid
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#define BAD_CIPHER_MODE -4 // Params struct passed to cipherInit invalid
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#define BAD_CIPHER_STATE -5 // Cipher in wrong state (e.g., not initialized)
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#define BAD_BLOCK_LENGTH -6
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#define BAD_CIPHER_INSTANCE -7
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// CHANGE POSSIBLE: inclusion of algorithm specific defines
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// 14.Dec.2005 Cirilo: keys are now unsigned char rather than hex (ASCII)
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#define MAX_KEY_SIZE 32 // # of unsigned char's needed to represent a key
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#define MAX_IV_SIZE 16 // # bytes needed to represent an IV
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// Typedefs:
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// Typedef'ed data storage elements. Add any algorithm specific parameters at the bottom of the structs as appropriate.
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typedef unsigned char BYTE;
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// The structure for key information
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typedef struct {
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BYTE direction; /// Key used for encrypting or decrypting?
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int keyLen; /// Length of the key
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char keyMaterial[MAX_KEY_SIZE+1]; /// Raw key data in ASCII, e.g., user input or KAT values
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/// The following parameters are algorithm dependent, replace or add as necessary
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int blockLen; /// block length
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word8 keySched[MAXROUNDS+1][4][4]; /// key schedule
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} keyInstance;
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// The structure for cipher information
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typedef struct { // changed order of the components
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BYTE mode; /// MODE_ECB, MODE_CBC, or MODE_CFB1
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BYTE IV[MAX_IV_SIZE]; /// A possible Initialization Vector for ciphering
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// Add any algorithm specific parameters needed here
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int blockLen; /// Sample: Handles non-128 bit block sizes (if available)
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} cipherInstance;
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// Function protoypes
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// CHANGED: makeKey(): parameter blockLen added this parameter is absolutely necessary if you want to
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// setup the round keys in a variable block length setting
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// cipherInit(): parameter blockLen added (for obvious reasons)
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int makeKey(keyInstance *key, BYTE direction, int keyLen, char *keyMaterial);
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int cipherInit(cipherInstance *cipher, BYTE mode, char *IV);
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int blockEncrypt(cipherInstance *cipher, keyInstance *key, BYTE *input,
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int inputLen, BYTE *outBuffer);
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int blockDecrypt(cipherInstance *cipher, keyInstance *key, BYTE *input,
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int inputLen, BYTE *outBuffer);
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int cipherUpdateRounds(cipherInstance *cipher, keyInstance *key, BYTE *input,
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int inputLen, BYTE *outBuffer, int Rounds);
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#endif // __RIJNDAEL_API_H
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