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aes.h

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00001 /*
00002  ---------------------------------------------------------------------------
00003  Copyright (c) 2003, Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK.
00004  All rights reserved.
00005 
00006  LICENSE TERMS
00007 
00008  The free distribution and use of this software in both source and binary
00009  form is allowed (with or without changes) provided that:
00010 
00011    1. distributions of this source code include the above copyright
00012       notice, this list of conditions and the following disclaimer;
00013 
00014    2. distributions in binary form include the above copyright
00015       notice, this list of conditions and the following disclaimer
00016       in the documentation and/or other associated materials;
00017 
00018    3. the copyright holder's name is not used to endorse products
00019       built using this software without specific written permission.
00020 
00021  ALTERNATIVELY, provided that this notice is retained in full, this product
00022  may be distributed under the terms of the GNU General Public License (GPL),
00023  in which case the provisions of the GPL apply INSTEAD OF those given above.
00024 
00025  DISCLAIMER
00026 
00027  This software is provided 'as is' with no explicit or implied warranties
00028  in respect of its properties, including, but not limited to, correctness
00029  and/or fitness for purpose.
00030  ---------------------------------------------------------------------------
00031  Issue Date: 26/08/2003
00032 
00033  This file contains the definitions required to use AES in C. See aesopt.h
00034  for optimisation details.
00035 */
00036 
00037 #ifndef _AES_H
00038 #define _AES_H
00039 
00040 /*  This include is used to find 8 & 32 bit unsigned integer types  */
00041 #include "limits.h"
00042 
00043 #if defined(__cplusplus)
00044 extern "C"
00045 {
00046 #endif
00047 
00048 #define AES_128     /* define if AES with 128 bit keys is needed    */
00049 #undef AES_192     /* define if AES with 192 bit keys is needed    */
00050 #undef AES_256     /* define if AES with 256 bit keys is needed    */
00051 #undef AES_VAR     /* define if a variable key size is needed      */
00052 
00053 /* The following must also be set in assembler files if being used  */
00054 
00055 #define AES_ENCRYPT /* if support for encryption is needed          */
00056 #define AES_DECRYPT /* if support for decryption is needed          */
00057 #define AES_ERR_CHK /* for parameter checks & error return codes    */
00058 
00059 #if UCHAR_MAX == 0xff                   /* an unsigned 8 bit type   */
00060   typedef unsigned char      aes_08t;
00061 #else
00062 #error Please define aes_08t as an 8-bit unsigned integer type in aes.h
00063 #endif
00064 
00065 #if UINT_MAX == 0xffffffff              /* an unsigned 32 bit type  */
00066   typedef   unsigned int     aes_32t;
00067 #elif ULONG_MAX == 0xffffffff
00068   typedef   unsigned long    aes_32t;
00069 #else
00070 #error Please define aes_32t as a 32-bit unsigned integer type in aes.h
00071 #endif
00072 
00073 #define AES_BLOCK_SIZE  16  /* the AES block size in bytes          */
00074 #define N_COLS           4  /* the number of columns in the state   */
00075 
00076 /* a maximum of 60 32-bit words are needed for the key schedule but */
00077 /* 64 are claimed to allow space at the top for a CBC xor buffer.   */
00078 /* If this is not needed, this value can be reduced to 60. A value  */
00079 /* of 64 may also help in maintaining alignment in some situations  */
00080 #define KS_LENGTH       64
00081 
00082 #ifdef  AES_ERR_CHK
00083 #define aes_ret     int
00084 #define aes_good    0
00085 #define aes_error  -1
00086 #else
00087 #define aes_ret     void
00088 #endif
00089 
00090 #ifndef AES_DLL                 /* implement normal/DLL functions   */
00091 #define aes_rval    aes_ret
00092 #else
00093 #define aes_rval    aes_ret __declspec(dllexport) _stdcall
00094 #endif
00095 
00096 /* This routine must be called before first use if non-static       */
00097 /* tables are being used                                            */
00098 
00099 void gen_tabs(void);
00100 
00101 /* The key length (klen) is input in bytes when it is in the range  */
00102 /* 16 <= klen <= 32 or in bits when in the range 128 <= klen <= 256 */
00103 
00104 #ifdef  AES_ENCRYPT
00105 
00106 typedef struct  
00107 {   aes_32t ks[KS_LENGTH];
00108 } aes_encrypt_ctx;
00109 
00110 #if defined(AES_128) || defined(AES_VAR)
00111 aes_rval aes_encrypt_key128(const void *in_key, aes_encrypt_ctx cx[1]);
00112 #endif
00113 
00114 #if defined(AES_192) || defined(AES_VAR)
00115 aes_rval aes_encrypt_key192(const void *in_key, aes_encrypt_ctx cx[1]);
00116 #endif
00117 
00118 #if defined(AES_256) || defined(AES_VAR)
00119 aes_rval aes_encrypt_key256(const void *in_key, aes_encrypt_ctx cx[1]);
00120 #endif
00121 
00122 #if defined(AES_VAR)
00123 aes_rval aes_encrypt_key(const void *in_key, int key_len, aes_encrypt_ctx cx[1]);
00124 #endif
00125 
00126 aes_rval aes_encrypt(const void *in_blk, void *out_blk, const aes_encrypt_ctx cx[1]);
00127 #endif
00128 
00129 #ifdef AES_DECRYPT
00130 
00131 typedef struct  
00132 {   aes_32t ks[KS_LENGTH];
00133 } aes_decrypt_ctx;
00134 
00135 #if defined(AES_128) || defined(AES_VAR)
00136 aes_rval aes_decrypt_key128(const void *in_key, aes_decrypt_ctx cx[1]);
00137 #endif
00138 
00139 #if defined(AES_192) || defined(AES_VAR)
00140 aes_rval aes_decrypt_key192(const void *in_key, aes_decrypt_ctx cx[1]);
00141 #endif
00142 
00143 #if defined(AES_256) || defined(AES_VAR)
00144 aes_rval aes_decrypt_key256(const void *in_key, aes_decrypt_ctx cx[1]);
00145 #endif
00146 
00147 #if defined(AES_VAR)
00148 aes_rval aes_decrypt_key(const void *in_key, int key_len, aes_decrypt_ctx cx[1]);
00149 #endif
00150 
00151 aes_rval aes_decrypt(const void *in_blk, void *out_blk, const aes_decrypt_ctx cx[1]);
00152 #endif
00153 
00154 #if defined(__cplusplus)
00155 }
00156 #endif
00157 
00158 #endif

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