crypto-algorithms.c

Basic implementations of standard cryptography algorithms, like AES and SHA-1
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blowfish.h (1294B)

      1 /*********************************************************************
      2 * Filename:   blowfish.h
      3 * Author:     Brad Conte (brad AT bradconte.com)
      4 * Copyright:
      5 * Disclaimer: This code is presented "as is" without any guarantees.
      6 * Details:    Defines the API for the corresponding Blowfish implementation.
      7 *********************************************************************/
      8 
      9 #ifndef BLOWFISH_H
     10 #define BLOWFISH_H
     11 
     12 /*************************** HEADER FILES ***************************/
     13 #include <stddef.h>
     14 
     15 /****************************** MACROS ******************************/
     16 #define BLOWFISH_BLOCK_SIZE 8           // Blowfish operates on 8 bytes at a time
     17 
     18 /**************************** DATA TYPES ****************************/
     19 typedef unsigned char BYTE;             // 8-bit byte
     20 typedef unsigned int  WORD;             // 32-bit word, change to "long" for 16-bit machines
     21 
     22 typedef struct {
     23    WORD p[18];
     24    WORD s[4][256];
     25 } BLOWFISH_KEY;
     26 
     27 /*********************** FUNCTION DECLARATIONS **********************/
     28 void blowfish_key_setup(const BYTE user_key[], BLOWFISH_KEY *keystruct, size_t len);
     29 void blowfish_encrypt(const BYTE in[], BYTE out[], const BLOWFISH_KEY *keystruct);
     30 void blowfish_decrypt(const BYTE in[], BYTE out[], const BLOWFISH_KEY *keystruct);
     31 
     32 #endif   // BLOWFISH_H