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Annotation of truecrypt/crypto/aes.h, revision 1.1

1.1     ! root        1: /*
        !             2:  ---------------------------------------------------------------------------
        !             3:  Copyright (c) 2003, Dr Brian Gladman, Worcester, UK.   All rights reserved.
        !             4: 
        !             5:  LICENSE TERMS
        !             6: 
        !             7:  The free distribution and use of this software in both source and binary
        !             8:  form is allowed (with or without changes) provided that:
        !             9: 
        !            10:    1. distributions of this source code include the above copyright
        !            11:       notice, this list of conditions and the following disclaimer;
        !            12: 
        !            13:    2. distributions in binary form include the above copyright
        !            14:       notice, this list of conditions and the following disclaimer
        !            15:       in the documentation and/or other associated materials;
        !            16: 
        !            17:    3. the copyright holder's name is not used to endorse products
        !            18:       built using this software without specific written permission.
        !            19: 
        !            20:  ALTERNATIVELY, provided that this notice is retained in full, this product
        !            21:  may be distributed under the terms of the GNU General Public License (GPL),
        !            22:  in which case the provisions of the GPL apply INSTEAD OF those given above.
        !            23: 
        !            24:  DISCLAIMER
        !            25: 
        !            26:  This software is provided 'as is' with no explicit or implied warranties
        !            27:  in respect of its properties, including, but not limited to, correctness
        !            28:  and/or fitness for purpose.
        !            29:  ---------------------------------------------------------------------------
        !            30:  Issue 28/01/2004
        !            31: 
        !            32:  This file contains the definitions required to use AES in C. See aesopt.h
        !            33:  for optimisation details.
        !            34: */
        !            35: 
        !            36: #if !defined( _AES_H )
        !            37: #define _AES_H
        !            38: 
        !            39: /*  This include is used to find 8 & 32 bit unsigned integer types  */
        !            40: #include "limits.h"
        !            41: 
        !            42: #if defined(__cplusplus)
        !            43: extern "C"
        !            44: {
        !            45: #endif
        !            46: 
        !            47: #define AES_128     /* define if AES with 128 bit keys is needed    */
        !            48: #define AES_192     /* define if AES with 192 bit keys is needed    */
        !            49: #define AES_256     /* define if AES with 256 bit keys is needed    */
        !            50: #define AES_VAR     /* define if a variable key size is needed      */
        !            51: 
        !            52: /* The following must also be set in assembler files if being used  */
        !            53: 
        !            54: #define AES_ENCRYPT /* if support for encryption is needed          */
        !            55: #define AES_DECRYPT /* if support for decryption is needed          */
        !            56: #define AES_ERR_CHK /* for parameter checks & error return codes    */
        !            57: 
        !            58: #if UCHAR_MAX == 0xff                   /* an unsigned 8 bit type   */
        !            59:   typedef unsigned char      aes_08t;
        !            60: #else
        !            61: #  error Please define aes_08t as an 8-bit unsigned integer type in aes.h
        !            62: #endif
        !            63: 
        !            64: #if UINT_MAX == 4294967295              /* an unsigned 32 bit type  */
        !            65:   typedef   unsigned int     aes_32t;
        !            66: #elif ULONG_MAX == 4294967295ul
        !            67:   typedef   unsigned long    aes_32t;
        !            68: #else
        !            69: #  error Please define aes_32t as a 32-bit unsigned integer type in aes.h
        !            70: #endif
        !            71: 
        !            72: #define AES_BLOCK_SIZE  16  /* the AES block size in bytes          */
        !            73: #define N_COLS           4  /* the number of columns in the state   */
        !            74: 
        !            75: /* The key schedule length is 11, 13 or 15 16-byte blocks for 128,  */
        !            76: /* 192 or 256-bit keys respectively. That is 176, 208 or 240 bytes  */
        !            77: /* or 44, 52 or 60 32-bit words. For simplicity this code allocates */
        !            78: /* the maximum 60 word array for the key schedule for all key sizes */
        !            79: 
        !            80: #if defined( AES_VAR ) || defined( AES_256 )
        !            81: #define KS_LENGTH       60
        !            82: #elif defined( AES_192 )
        !            83: #define KS_LENGTH       52
        !            84: #else
        !            85: #define KS_LENGTH       44
        !            86: #endif
        !            87: 
        !            88: #if defined( AES_ERR_CHK )
        !            89: #define aes_ret     int
        !            90: #define aes_good    0
        !            91: #define aes_error  -1
        !            92: #else
        !            93: #define aes_ret     void
        !            94: #endif
        !            95: 
        !            96: #if !defined( AES_DLL )                 /* implement normal/DLL functions   */
        !            97: #define aes_rval    aes_ret
        !            98: #else
        !            99: #define aes_rval    aes_ret __declspec(dllexport) _stdcall
        !           100: #endif
        !           101: 
        !           102: typedef struct
        !           103: {   aes_32t ks[KS_LENGTH];
        !           104:     aes_32t rn;
        !           105: } aes_encrypt_ctx;
        !           106: 
        !           107: typedef struct
        !           108: {   aes_32t ks[KS_LENGTH];
        !           109:     aes_32t rn;
        !           110: } aes_decrypt_ctx;
        !           111: 
        !           112: /* This routine must be called before first use if non-static       */
        !           113: /* tables are being used                                            */
        !           114: 
        !           115: void gen_tabs(void);
        !           116: 
        !           117: /* The key length (klen) is input in bytes when it is in the range  */
        !           118: /* 16 <= klen <= 32 or in bits when in the range 128 <= klen <= 256 */
        !           119: 
        !           120: #if defined( AES_ENCRYPT )
        !           121: 
        !           122: #if defined(AES_128) || defined(AES_VAR)
        !           123: aes_rval aes_encrypt_key128(const unsigned char *in_key, aes_encrypt_ctx cx[1]);
        !           124: #endif
        !           125: 
        !           126: #if defined(AES_192) || defined(AES_VAR)
        !           127: aes_rval aes_encrypt_key192(const unsigned char *in_key, aes_encrypt_ctx cx[1]);
        !           128: #endif
        !           129: 
        !           130: #if defined(AES_256) || defined(AES_VAR)
        !           131: aes_rval aes_encrypt_key256(const unsigned char *in_key, aes_encrypt_ctx cx[1]);
        !           132: #endif
        !           133: 
        !           134: #if defined(AES_VAR)
        !           135: aes_rval _cdecl aes_encrypt_key(const unsigned char *in_key, int key_len, aes_encrypt_ctx cx[1]);
        !           136: #endif
        !           137: 
        !           138: aes_rval _cdecl aes_encrypt(const unsigned char *in_blk, unsigned char *out_blk, const aes_encrypt_ctx cx[1]);
        !           139: #endif
        !           140: 
        !           141: #if defined( AES_DECRYPT )
        !           142: 
        !           143: #if defined(AES_128) || defined(AES_VAR)
        !           144: aes_rval aes_decrypt_key128(const unsigned char *in_key, aes_decrypt_ctx cx[1]);
        !           145: #endif
        !           146: 
        !           147: #if defined(AES_192) || defined(AES_VAR)
        !           148: aes_rval aes_decrypt_key192(const unsigned char *in_key, aes_decrypt_ctx cx[1]);
        !           149: #endif
        !           150: 
        !           151: #if defined(AES_256) || defined(AES_VAR)
        !           152: aes_rval aes_decrypt_key256(const unsigned char *in_key, aes_decrypt_ctx cx[1]);
        !           153: #endif
        !           154: 
        !           155: #if defined(AES_VAR)
        !           156: aes_rval _cdecl aes_decrypt_key(const unsigned char *in_key, int key_len, aes_decrypt_ctx cx[1]);
        !           157: #endif
        !           158: 
        !           159: aes_rval _cdecl aes_decrypt(const unsigned char *in_blk,  unsigned char *out_blk, const aes_decrypt_ctx cx[1]);
        !           160: #endif
        !           161: 
        !           162: #if defined(__cplusplus)
        !           163: }
        !           164: #endif
        !           165: 
        !           166: #endif

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