38 lines
1.4 KiB
C
38 lines
1.4 KiB
C
/*********************************************************************
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* Filename: des.h
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* Author: Brad Conte (brad AT bradconte.com)
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* Copyright:
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* Disclaimer: This code is presented "as is" without any guarantees.
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* Details: Defines the API for the corresponding DES implementation.
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Note that encryption and decryption are defined by how
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the key setup is performed, the actual en/de-cryption is
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performed by the same function.
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*********************************************************************/
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#ifndef DES_H
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#define DESH
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/*************************** HEADER FILES ***************************/
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#include <stddef.h>
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/****************************** MACROS ******************************/
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#define DES_BLOCK_SIZE 8 // DES operates on 8 bytes at a time
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/**************************** DATA TYPES ****************************/
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typedef unsigned char BYTE; // 8-bit byte
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typedef unsigned int WORD; // 32-bit word, change to "long" for 16-bit machines
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typedef enum {
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DES_ENCRYPT,
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DES_DECRYPT
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} DES_MODE;
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/*********************** FUNCTION DECLARATIONS **********************/
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void des_key_setup(const BYTE key[], BYTE schedule[][6], DES_MODE mode);
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void des_crypt(const BYTE in[], BYTE out[], const BYTE key[][6]);
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void three_des_key_setup(const BYTE key[], BYTE schedule[][16][6], DES_MODE mode);
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void three_des_crypt(const BYTE in[], BYTE out[], const BYTE key[][16][6]);
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#endif // DES_H
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