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104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/*
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-------------------------------------------------------------------------
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Copyright (c) 2001, Dr Brian Gladman < >, Worcester, UK.
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All rights reserved.
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LICENSE TERMS
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The free distribution and use of this software in both source and binary
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form is allowed (with or without changes) provided that:
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1. distributions of this source code include the above copyright
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notice, this list of conditions and the following disclaimer;
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2. distributions in binary form include the above copyright
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notice, this list of conditions and the following disclaimer
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in the documentation and/or other associated materials;
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3. the copyright holder's name is not used to endorse products
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built using this software without specific written permission.
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DISCLAIMER
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This software is provided 'as is' with no explicit or implied warranties
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in respect of its properties, including, but not limited to, correctness
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and fitness for purpose.
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-------------------------------------------------------------------------
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Issue Date: 29/07/2002
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This file contains the definitions required to use AES (Rijndael) in C.
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*/
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#ifndef _AES_H
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#define _AES_H
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/* This include is used only to find 8 and 32 bit unsigned integer types */
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#include "limits.h"
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#if UCHAR_MAX == 0xff /* an unsigned 8 bit type for internal AES use */
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typedef unsigned char aes_08t;
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#else
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#error Please define an unsigned 8 bit type in aes.h
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#endif
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#if UINT_MAX == 0xffffffff /* an unsigned 32 bit type for internal AES use */
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typedef unsigned int aes_32t;
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#elif ULONG_MAX == 0xffffffff
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typedef unsigned long aes_32t;
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#else
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#error Please define an unsigned 32 bit type in aes.h
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#endif
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/* BLOCK_SIZE is in BYTES: 16, 24, 32 or undefined for aes.c and 16, 20,
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24, 28, 32 or undefined for aespp.c. When left undefined a slower
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version that provides variable block length is compiled.
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*/
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// #define BLOCK_SIZE 16
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/* key schedule length (in 32-bit words) */
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#if !defined(BLOCK_SIZE)
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#define KS_LENGTH 128
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#else
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#define KS_LENGTH 4 * BLOCK_SIZE
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#endif
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#if defined(__cplusplus)
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extern "C"
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{
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#endif
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typedef unsigned int aes_fret; /* type for function return value */
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#define aes_bad 0 /* bad function return value */
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#define aes_good 1 /* good function return value */
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#ifndef AES_DLL /* implement normal or DLL functions */
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#define aes_rval aes_fret
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#else
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#define aes_rval aes_fret __declspec(dllexport) _stdcall
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#endif
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typedef struct /* the AES context for encryption */
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{ aes_32t k_sch[KS_LENGTH]; /* the encryption key schedule */
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aes_32t n_rnd; /* the number of cipher rounds */
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aes_32t n_blk; /* the number of bytes in the state */
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} aes_ctx;
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#if !defined(BLOCK_SIZE)
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aes_rval aes_blk_len(unsigned int blen, aes_ctx cx[1]);
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#endif
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aes_rval aes_enc_key(const unsigned char in_key[], unsigned int klen, aes_ctx cx[1]);
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aes_rval aes_enc_blk(const unsigned char in_blk[], unsigned char out_blk[], const aes_ctx cx[1]);
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aes_rval aes_dec_key(const unsigned char in_key[], unsigned int klen, aes_ctx cx[1]);
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aes_rval aes_dec_blk(const unsigned char in_blk[], unsigned char out_blk[], const aes_ctx cx[1]);
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#if defined(__cplusplus)
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}
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#endif
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#endif
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