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79 lines
3.3 KiB
C
79 lines
3.3 KiB
C
/******************************************************************************
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*
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* THIS SOURCE CODE IS HEREBY PLACED INTO THE PUBLIC DOMAIN FOR THE GOOD OF ALL
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*
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* This is a simple and straightforward implementation of the AES Rijndael
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* 128-bit block cipher designed by Vincent Rijmen and Joan Daemen. The focus
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* of this work was correctness & accuracy. It is written in 'C' without any
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* particular focus upon optimization or speed. It should be endian (memory
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* byte order) neutral since the few places that care are handled explicitly.
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*
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* This implementation of Rijndael was created by Steven M. Gibson of GRC.com.
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*
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* It is intended for general purpose use, but was written in support of GRC's
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* reference implementation of the SQRL (Secure Quick Reliable Login) client.
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*
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* See: http://csrc.nist.gov/archive/aes/rijndael/wsdindex.html
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*
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* NO COPYRIGHT IS CLAIMED IN THIS WORK, HOWEVER, NEITHER IS ANY WARRANTY MADE
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* REGARDING ITS FITNESS FOR ANY PARTICULAR PURPOSE. USE IT AT YOUR OWN RISK.
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*
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*******************************************************************************/
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#pragma once
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/******************************************************************************/
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#define AES_DECRYPTION 0 // whether AES decryption is supported
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/******************************************************************************/
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#include <string.h>
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#define AES_ENCRYPT 1 // specify whether we're encrypting
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#define AES_DECRYPT 0 // or decrypting
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#if defined(_MSC_VER)
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#include <basetsd.h>
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typedef UINT32 uint32_t;
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#else
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#include <inttypes.h>
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#endif
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typedef unsigned char uchar; // add some convienent shorter types
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typedef unsigned int uint;
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/******************************************************************************
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* AES_INIT_KEYGEN_TABLES : MUST be called once before any AES use
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******************************************************************************/
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void aes_init_keygen_tables(void);
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/******************************************************************************
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* AES_CONTEXT : cipher context / holds inter-call data
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******************************************************************************/
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typedef struct {
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int mode; // 1 for Encryption, 0 for Decryption
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int rounds; // keysize-based rounds count
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uint32_t *rk; // pointer to current round key
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uint32_t buf[68]; // key expansion buffer
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} aes_context;
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/******************************************************************************
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* AES_SETKEY : called to expand the key for encryption or decryption
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******************************************************************************/
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int aes_setkey(aes_context *ctx, // pointer to context
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int mode, // 1 or 0 for Encrypt/Decrypt
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const uchar *key, // AES input key
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uint keysize); // size in bytes (must be 16, 24, 32 for
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// 128, 192 or 256-bit keys respectively)
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// returns 0 for success
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/******************************************************************************
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* AES_CIPHER : called to encrypt or decrypt ONE 128-bit block of data
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******************************************************************************/
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int aes_cipher(aes_context *ctx, // pointer to context
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const uchar input[16], // 128-bit block to en/decipher
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uchar output[16]); // 128-bit output result block
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// returns 0 for success
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