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Diffstat (limited to 'trunk/include/asterisk/aes_internal.h')
| -rw-r--r-- | trunk/include/asterisk/aes_internal.h | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/trunk/include/asterisk/aes_internal.h b/trunk/include/asterisk/aes_internal.h new file mode 100644 index 000000000..18c27a6d4 --- /dev/null +++ b/trunk/include/asterisk/aes_internal.h @@ -0,0 +1,170 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * See http://www.asterisk.org for more information about + * the Asterisk project. Please do not directly contact + * any of the maintainers of this project for assistance; + * the project provides a web site, mailing lists and IRC + * channels for your use. + */ + +/* + --------------------------------------------------------------------------- + Copyright (c) 2003, Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK. + All rights reserved. + + LICENSE TERMS + + The free distribution and use of this software in both source and binary + form is allowed (with or without changes) provided that: + + 1. distributions of this source code include the above copyright + notice, this list of conditions and the following disclaimer; + + 2. distributions in binary form include the above copyright + notice, this list of conditions and the following disclaimer + in the documentation and/or other associated materials; + + 3. the copyright holder's name is not used to endorse products + built using this software without specific written permission. + + ALTERNATIVELY, provided that this notice is retained in full, this product + may be distributed under the terms of the GNU General Public License (GPL), + in which case the provisions of the GPL apply INSTEAD OF those given above. + + DISCLAIMER + + This software is provided 'as is' with no explicit or implied warranties + in respect of its properties, including, but not limited to, correctness + and/or fitness for purpose. + --------------------------------------------------------------------------- + Issue Date: 26/08/2003 +*/ +/*!\file + + \brief This file contains the definitions required to use AES in C. See aesopt.h + for optimisation details. +*/ + +#ifndef _AES_INTERNAL_H +#define _AES_INTERNAL_H + +/* This include is used to find 8 & 32 bit unsigned integer types */ +#include "limits.h" + +#if defined(__cplusplus) +extern "C" +{ +#endif + +#define AES_128 /* define if AES with 128 bit keys is needed */ +#undef AES_192 /* define if AES with 192 bit keys is needed */ +#undef AES_256 /* define if AES with 256 bit keys is needed */ +#undef AES_VAR /* define if a variable key size is needed */ + +/* The following must also be set in assembler files if being used */ + +#define AES_ENCRYPT /* if support for encryption is needed */ +#define AES_DECRYPT /* if support for decryption is needed */ +#define AES_ERR_CHK /* for parameter checks & error return codes */ + +#if UCHAR_MAX == 0xff /* an unsigned 8 bit type */ + typedef unsigned char aes_08t; +#else +#error Please define aes_08t as an 8-bit unsigned integer type in aes.h +#endif + +#if UINT_MAX == 0xffffffff /* an unsigned 32 bit type */ + typedef unsigned int aes_32t; +#elif ULONG_MAX == 0xffffffff + typedef unsigned long aes_32t; +#else +#error Please define aes_32t as a 32-bit unsigned integer type in aes.h +#endif + +#define AES_BLOCK_SIZE 16 /* the AES block size in bytes */ +#define N_COLS 4 /* the number of columns in the state */ + +/* a maximum of 60 32-bit words are needed for the key schedule but */ +/* 64 are claimed to allow space at the top for a CBC xor buffer. */ +/* If this is not needed, this value can be reduced to 60. A value */ +/* of 64 may also help in maintaining alignment in some situations */ +#define KS_LENGTH 64 + +#ifdef AES_ERR_CHK +#define aes_ret int +#define aes_good 0 +#define aes_error -1 +#else +#define aes_ret void +#endif + +#ifndef AES_DLL /* implement normal/DLL functions */ +#define aes_rval aes_ret +#else +#define aes_rval aes_ret __declspec(dllexport) _stdcall +#endif + +/* This routine must be called before first use if non-static */ +/* tables are being used */ + +void gen_tabs(void); + +/* The key length (klen) is input in bytes when it is in the range */ +/* 16 <= klen <= 32 or in bits when in the range 128 <= klen <= 256 */ + +#ifdef AES_ENCRYPT + +typedef struct +{ aes_32t ks[KS_LENGTH]; +} aes_encrypt_ctx; + +#if defined(AES_128) || defined(AES_VAR) +aes_rval aes_encrypt_key128(const void *in_key, aes_encrypt_ctx cx[1]); +#endif + +#if defined(AES_192) || defined(AES_VAR) +aes_rval aes_encrypt_key192(const void *in_key, aes_encrypt_ctx cx[1]); +#endif + +#if defined(AES_256) || defined(AES_VAR) +aes_rval aes_encrypt_key256(const void *in_key, aes_encrypt_ctx cx[1]); +#endif + +#if defined(AES_VAR) +aes_rval aes_encrypt_key(const void *in_key, int key_len, aes_encrypt_ctx cx[1]); +#endif + +aes_rval aes_encrypt(const void *in_blk, void *out_blk, const aes_encrypt_ctx cx[1]); +#endif + +#ifdef AES_DECRYPT + +typedef struct +{ aes_32t ks[KS_LENGTH]; +} aes_decrypt_ctx; + +#if defined(AES_128) || defined(AES_VAR) +aes_rval aes_decrypt_key128(const void *in_key, aes_decrypt_ctx cx[1]); +#endif + +#if defined(AES_192) || defined(AES_VAR) +aes_rval aes_decrypt_key192(const void *in_key, aes_decrypt_ctx cx[1]); +#endif + +#if defined(AES_256) || defined(AES_VAR) +aes_rval aes_decrypt_key256(const void *in_key, aes_decrypt_ctx cx[1]); +#endif + +#if defined(AES_VAR) +aes_rval aes_decrypt_key(const void *in_key, int key_len, aes_decrypt_ctx cx[1]); +#endif + +aes_rval aes_decrypt(const void *in_blk, void *out_blk, const aes_decrypt_ctx cx[1]); +#endif + +#if defined(__cplusplus) +} +#endif + +#endif |