Alexandre Lision | 7fd5d3d | 2013-12-04 13:06:40 -0500 | [diff] [blame] | 1 | /* |
| 2 | --------------------------------------------------------------------------- |
| 3 | Copyright (c) 1998-2010, Brian Gladman, Worcester, UK. All rights reserved. |
| 4 | |
| 5 | The redistribution and use of this software (with or without changes) |
| 6 | is allowed without the payment of fees or royalties provided that: |
| 7 | |
| 8 | source code distributions include the above copyright notice, this |
| 9 | list of conditions and the following disclaimer; |
| 10 | |
| 11 | binary distributions include the above copyright notice, this list |
| 12 | of conditions and the following disclaimer in their documentation. |
| 13 | |
| 14 | This software is provided 'as is' with no explicit or implied warranties |
| 15 | in respect of its operation, including, but not limited to, correctness |
| 16 | and fitness for purpose. |
| 17 | --------------------------------------------------------------------------- |
| 18 | Issue Date: 20/12/2007 |
| 19 | |
| 20 | This file contains the definitions required to use AES in C. See aesopt.h |
| 21 | for optimisation details. |
| 22 | */ |
| 23 | |
| 24 | #ifndef _AES_H |
| 25 | #define _AES_H |
| 26 | |
| 27 | #include <stdlib.h> |
| 28 | |
| 29 | /* This include is used to find 8 & 32 bit unsigned integer types */ |
| 30 | #include "brg_types.h" |
| 31 | |
| 32 | #if defined(__cplusplus) |
| 33 | extern "C" |
| 34 | { |
| 35 | #endif |
| 36 | |
| 37 | #define AES_128 /* if a fast 128 bit key scheduler is needed */ |
| 38 | #define AES_192 /* if a fast 192 bit key scheduler is needed */ |
| 39 | #define AES_256 /* if a fast 256 bit key scheduler is needed */ |
| 40 | #define AES_VAR /* if variable key size scheduler is needed */ |
| 41 | #define AES_MODES /* if support is needed for modes */ |
| 42 | |
| 43 | /* The following must also be set in assembler files if being used */ |
| 44 | |
| 45 | #define AES_ENCRYPT /* if support for encryption is needed */ |
| 46 | #define AES_DECRYPT /* if support for decryption is needed */ |
| 47 | #define AES_REV_DKS /* define to reverse decryption key schedule */ |
| 48 | |
| 49 | #define AES_BLOCK_SIZE 16 /* the AES block size in bytes */ |
| 50 | #define N_COLS 4 /* the number of columns in the state */ |
| 51 | |
| 52 | /* The key schedule length is 11, 13 or 15 16-byte blocks for 128, */ |
| 53 | /* 192 or 256-bit keys respectively. That is 176, 208 or 240 bytes */ |
| 54 | /* or 44, 52 or 60 32-bit words. */ |
| 55 | |
| 56 | #if defined( AES_VAR ) || defined( AES_256 ) |
| 57 | #define KS_LENGTH 60 |
| 58 | #elif defined( AES_192 ) |
| 59 | #define KS_LENGTH 52 |
| 60 | #else |
| 61 | #define KS_LENGTH 44 |
| 62 | #endif |
| 63 | |
| 64 | #define AES_RETURN INT_RETURN |
| 65 | |
| 66 | /* the character array 'inf' in the following structures is used */ |
| 67 | /* to hold AES context information. This AES code uses cx->inf.b[0] */ |
| 68 | /* to hold the number of rounds multiplied by 16. The other three */ |
| 69 | /* elements can be used by code that implements additional modes */ |
| 70 | |
| 71 | typedef union |
| 72 | { uint_32t l; |
| 73 | uint_8t b[4]; |
| 74 | } aes_inf; |
| 75 | |
| 76 | typedef struct |
| 77 | { uint_32t ks[KS_LENGTH]; |
| 78 | aes_inf inf; |
| 79 | } aes_encrypt_ctx; |
| 80 | |
| 81 | typedef struct |
| 82 | { uint_32t ks[KS_LENGTH]; |
| 83 | aes_inf inf; |
| 84 | } aes_decrypt_ctx; |
| 85 | |
| 86 | /* This routine must be called before first use if non-static */ |
| 87 | /* tables are being used */ |
| 88 | |
| 89 | AES_RETURN aes_init(void); |
| 90 | |
| 91 | /* Key lengths in the range 16 <= key_len <= 32 are given in bytes, */ |
| 92 | /* those in the range 128 <= key_len <= 256 are given in bits */ |
| 93 | |
| 94 | #if defined( AES_ENCRYPT ) |
| 95 | |
| 96 | #if defined( AES_128 ) || defined( AES_VAR) |
| 97 | AES_RETURN aes_encrypt_key128(const unsigned char *key, aes_encrypt_ctx cx[1]); |
| 98 | #endif |
| 99 | |
| 100 | #if defined( AES_192 ) || defined( AES_VAR) |
| 101 | AES_RETURN aes_encrypt_key192(const unsigned char *key, aes_encrypt_ctx cx[1]); |
| 102 | #endif |
| 103 | |
| 104 | #if defined( AES_256 ) || defined( AES_VAR) |
| 105 | AES_RETURN aes_encrypt_key256(const unsigned char *key, aes_encrypt_ctx cx[1]); |
| 106 | #endif |
| 107 | |
| 108 | #if defined( AES_VAR ) |
| 109 | AES_RETURN aes_encrypt_key(const unsigned char *key, int key_len, aes_encrypt_ctx cx[1]); |
| 110 | #endif |
| 111 | |
| 112 | AES_RETURN aes_encrypt(const unsigned char *in, unsigned char *out, const aes_encrypt_ctx cx[1]); |
| 113 | |
| 114 | #endif |
| 115 | |
| 116 | #if defined( AES_DECRYPT ) |
| 117 | |
| 118 | #if defined( AES_128 ) || defined( AES_VAR) |
| 119 | AES_RETURN aes_decrypt_key128(const unsigned char *key, aes_decrypt_ctx cx[1]); |
| 120 | #endif |
| 121 | |
| 122 | #if defined( AES_192 ) || defined( AES_VAR) |
| 123 | AES_RETURN aes_decrypt_key192(const unsigned char *key, aes_decrypt_ctx cx[1]); |
| 124 | #endif |
| 125 | |
| 126 | #if defined( AES_256 ) || defined( AES_VAR) |
| 127 | AES_RETURN aes_decrypt_key256(const unsigned char *key, aes_decrypt_ctx cx[1]); |
| 128 | #endif |
| 129 | |
| 130 | #if defined( AES_VAR ) |
| 131 | AES_RETURN aes_decrypt_key(const unsigned char *key, int key_len, aes_decrypt_ctx cx[1]); |
| 132 | #endif |
| 133 | |
| 134 | AES_RETURN aes_decrypt(const unsigned char *in, unsigned char *out, const aes_decrypt_ctx cx[1]); |
| 135 | |
| 136 | #endif |
| 137 | |
| 138 | #if defined( AES_MODES ) |
| 139 | |
| 140 | /* Multiple calls to the following subroutines for multiple block */ |
| 141 | /* ECB, CBC, CFB, OFB and CTR mode encryption can be used to handle */ |
| 142 | /* long messages incremantally provided that the context AND the iv */ |
| 143 | /* are preserved between all such calls. For the ECB and CBC modes */ |
| 144 | /* each individual call within a series of incremental calls must */ |
| 145 | /* process only full blocks (i.e. len must be a multiple of 16) but */ |
| 146 | /* the CFB, OFB and CTR mode calls can handle multiple incremental */ |
| 147 | /* calls of any length. Each mode is reset when a new AES key is */ |
| 148 | /* set but ECB and CBC operations can be reset without setting a */ |
| 149 | /* new key by setting a new IV value. To reset CFB, OFB and CTR */ |
| 150 | /* without setting the key, aes_mode_reset() must be called and the */ |
| 151 | /* IV must be set. NOTE: All these calls update the IV on exit so */ |
| 152 | /* this has to be reset if a new operation with the same IV as the */ |
| 153 | /* previous one is required (or decryption follows encryption with */ |
| 154 | /* the same IV array). */ |
| 155 | |
| 156 | AES_RETURN aes_test_alignment_detection(unsigned int n); |
| 157 | |
| 158 | AES_RETURN aes_ecb_encrypt(const unsigned char *ibuf, unsigned char *obuf, |
| 159 | int len, const aes_encrypt_ctx cx[1]); |
| 160 | |
| 161 | AES_RETURN aes_ecb_decrypt(const unsigned char *ibuf, unsigned char *obuf, |
| 162 | int len, const aes_decrypt_ctx cx[1]); |
| 163 | |
| 164 | AES_RETURN aes_cbc_encrypt(const unsigned char *ibuf, unsigned char *obuf, |
| 165 | int len, unsigned char *iv, const aes_encrypt_ctx cx[1]); |
| 166 | |
| 167 | AES_RETURN aes_cbc_decrypt(const unsigned char *ibuf, unsigned char *obuf, |
| 168 | int len, unsigned char *iv, const aes_decrypt_ctx cx[1]); |
| 169 | |
| 170 | AES_RETURN aes_mode_reset(aes_encrypt_ctx cx[1]); |
| 171 | |
| 172 | AES_RETURN aes_cfb_encrypt(const unsigned char *ibuf, unsigned char *obuf, |
| 173 | int len, unsigned char *iv, aes_encrypt_ctx cx[1]); |
| 174 | |
| 175 | AES_RETURN aes_cfb_decrypt(const unsigned char *ibuf, unsigned char *obuf, |
| 176 | int len, unsigned char *iv, aes_encrypt_ctx cx[1]); |
| 177 | |
| 178 | #define aes_ofb_encrypt aes_ofb_crypt |
| 179 | #define aes_ofb_decrypt aes_ofb_crypt |
| 180 | |
| 181 | AES_RETURN aes_ofb_crypt(const unsigned char *ibuf, unsigned char *obuf, |
| 182 | int len, unsigned char *iv, aes_encrypt_ctx cx[1]); |
| 183 | |
| 184 | typedef void cbuf_inc(unsigned char *cbuf); |
| 185 | |
| 186 | #define aes_ctr_encrypt aes_ctr_crypt |
| 187 | #define aes_ctr_decrypt aes_ctr_crypt |
| 188 | |
| 189 | AES_RETURN aes_ctr_crypt(const unsigned char *ibuf, unsigned char *obuf, |
| 190 | int len, unsigned char *cbuf, cbuf_inc ctr_inc, aes_encrypt_ctx cx[1]); |
| 191 | |
| 192 | #endif |
| 193 | |
| 194 | #if defined(__cplusplus) |
| 195 | } |
| 196 | #endif |
| 197 | |
| 198 | #endif |