2 ---------------------------------------------------------------------------
3 Copyright (c) 1998-2013, Brian Gladman, Worcester, UK. All rights reserved.
5 The redistribution and use of this software (with or without changes)
6 is allowed without the payment of fees or royalties provided that:
8 source code distributions include the above copyright notice, this
9 list of conditions and the following disclaimer;
11 binary distributions include the above copyright notice, this list
12 of conditions and the following disclaimer in their documentation.
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
20 This file contains the definitions required to use AES in C. See aesopt.h
21 for optimisation details.
29 /* This include is used to find 8 & 32 bit unsigned integer types */
30 #include "brg_types.h"
32 #if defined(__cplusplus)
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 */
43 /* The following must also be set in assembler files if being used */
45 #define AES_ENCRYPT /* if support for encryption is needed */
46 #define AES_DECRYPT /* if support for decryption is needed */
48 #define AES_BLOCK_SIZE 16 /* the AES block size in bytes */
49 #define N_COLS 4 /* the number of columns in the state */
51 /* The key schedule length is 11, 13 or 15 16-byte blocks for 128, */
52 /* 192 or 256-bit keys respectively. That is 176, 208 or 240 bytes */
53 /* or 44, 52 or 60 32-bit words. */
55 #if defined( AES_VAR ) || defined( AES_256 )
57 #elif defined( AES_192 )
63 #define AES_RETURN INT_RETURN
65 /* the character array 'inf' in the following structures is used */
66 /* to hold AES context information. This AES code uses cx->inf.b[0] */
67 /* to hold the number of rounds multiplied by 16. The other three */
68 /* elements can be used by code that implements additional modes */
76 # pragma warning( disable : 4324 )
79 #if defined(_MSC_VER) && defined(_WIN64)
80 #define ALIGNED_(x) __declspec(align(x))
81 #elif defined(__GNUC__) && defined(__x86_64__)
82 #define ALIGNED_(x) __attribute__ ((aligned(x)))
87 typedef struct ALIGNED_(16)
88 { uint32_t ks[KS_LENGTH];
92 typedef struct ALIGNED_(16)
93 { uint32_t ks[KS_LENGTH];
98 # pragma warning( default : 4324 )
101 /* This routine must be called before first use if non-static */
102 /* tables are being used */
104 AES_RETURN aes_init(void);
106 /* Key lengths in the range 16 <= key_len <= 32 are given in bytes, */
107 /* those in the range 128 <= key_len <= 256 are given in bits */
109 #if defined( AES_ENCRYPT )
111 #if defined( AES_128 ) || defined( AES_VAR)
112 AES_RETURN aes_encrypt_key128(const unsigned char *key, aes_encrypt_ctx cx[1]);
115 #if defined( AES_192 ) || defined( AES_VAR)
116 AES_RETURN aes_encrypt_key192(const unsigned char *key, aes_encrypt_ctx cx[1]);
119 #if defined( AES_256 ) || defined( AES_VAR)
120 AES_RETURN aes_encrypt_key256(const unsigned char *key, aes_encrypt_ctx cx[1]);
123 #if defined( AES_VAR )
124 AES_RETURN aes_encrypt_key(const unsigned char *key, int key_len, aes_encrypt_ctx cx[1]);
127 AES_RETURN aes_encrypt(const unsigned char *in, unsigned char *out, const aes_encrypt_ctx cx[1]);
131 #if defined( AES_DECRYPT )
133 #if defined( AES_128 ) || defined( AES_VAR)
134 AES_RETURN aes_decrypt_key128(const unsigned char *key, aes_decrypt_ctx cx[1]);
137 #if defined( AES_192 ) || defined( AES_VAR)
138 AES_RETURN aes_decrypt_key192(const unsigned char *key, aes_decrypt_ctx cx[1]);
141 #if defined( AES_256 ) || defined( AES_VAR)
142 AES_RETURN aes_decrypt_key256(const unsigned char *key, aes_decrypt_ctx cx[1]);
145 #if defined( AES_VAR )
146 AES_RETURN aes_decrypt_key(const unsigned char *key, int key_len, aes_decrypt_ctx cx[1]);
149 AES_RETURN aes_decrypt(const unsigned char *in, unsigned char *out, const aes_decrypt_ctx cx[1]);
153 #if defined( AES_MODES )
155 /* Multiple calls to the following subroutines for multiple block */
156 /* ECB, CBC, CFB, OFB and CTR mode encryption can be used to handle */
157 /* long messages incrementally provided that the context AND the iv */
158 /* are preserved between all such calls. For the ECB and CBC modes */
159 /* each individual call within a series of incremental calls must */
160 /* process only full blocks (i.e. len must be a multiple of 16) but */
161 /* the CFB, OFB and CTR mode calls can handle multiple incremental */
162 /* calls of any length. Each mode is reset when a new AES key is */
163 /* set but ECB needs no reset and CBC can be reset without setting */
164 /* a new key by setting a new IV value. To reset CFB, OFB and CTR */
165 /* without setting the key, aes_mode_reset() must be called and the */
166 /* IV must be set. NOTE: All these calls update the IV on exit so */
167 /* this has to be reset if a new operation with the same IV as the */
168 /* previous one is required (or decryption follows encryption with */
169 /* the same IV array). */
171 AES_RETURN aes_test_alignment_detection(unsigned int n);
173 AES_RETURN aes_ecb_encrypt(const unsigned char *ibuf, unsigned char *obuf,
174 int len, const aes_encrypt_ctx cx[1]);
176 AES_RETURN aes_ecb_decrypt(const unsigned char *ibuf, unsigned char *obuf,
177 int len, const aes_decrypt_ctx cx[1]);
179 AES_RETURN aes_cbc_encrypt(const unsigned char *ibuf, unsigned char *obuf,
180 int len, unsigned char *iv, const aes_encrypt_ctx cx[1]);
182 AES_RETURN aes_cbc_decrypt(const unsigned char *ibuf, unsigned char *obuf,
183 int len, unsigned char *iv, const aes_decrypt_ctx cx[1]);
185 AES_RETURN aes_mode_reset(aes_encrypt_ctx cx[1]);
187 AES_RETURN aes_cfb_encrypt(const unsigned char *ibuf, unsigned char *obuf,
188 int len, unsigned char *iv, aes_encrypt_ctx cx[1]);
190 AES_RETURN aes_cfb_decrypt(const unsigned char *ibuf, unsigned char *obuf,
191 int len, unsigned char *iv, aes_encrypt_ctx cx[1]);
193 #define aes_ofb_encrypt aes_ofb_crypt
194 #define aes_ofb_decrypt aes_ofb_crypt
196 AES_RETURN aes_ofb_crypt(const unsigned char *ibuf, unsigned char *obuf,
197 int len, unsigned char *iv, aes_encrypt_ctx cx[1]);
199 typedef void cbuf_inc(unsigned char *cbuf);
201 #define aes_ctr_encrypt aes_ctr_crypt
202 #define aes_ctr_decrypt aes_ctr_crypt
204 AES_RETURN aes_ctr_crypt(const unsigned char *ibuf, unsigned char *obuf,
205 int len, unsigned char *cbuf, cbuf_inc ctr_inc, aes_encrypt_ctx cx[1]);
210 # define ADD_AESNI_MODE_CALLS
213 #if 0 && defined( ADD_AESNI_MODE_CALLS )
214 # define USE_AES_CONTEXT
217 #ifdef ADD_AESNI_MODE_CALLS
218 # ifdef USE_AES_CONTEXT
220 AES_RETURN aes_CBC_encrypt(const unsigned char *in,
222 unsigned char ivec[16],
223 unsigned long length,
224 const aes_encrypt_ctx cx[1]);
226 AES_RETURN aes_CBC_decrypt(const unsigned char *in,
228 unsigned char ivec[16],
229 unsigned long length,
230 const aes_decrypt_ctx cx[1]);
232 AES_RETURN AES_CTR_encrypt(const unsigned char *in,
234 const unsigned char ivec[8],
235 const unsigned char nonce[4],
236 unsigned long length,
237 const aes_encrypt_ctx cx[1]);
241 void aes_CBC_encrypt(const unsigned char *in,
243 unsigned char ivec[16],
244 unsigned long length,
246 int number_of_rounds);
248 void aes_CBC_decrypt(const unsigned char *in,
250 unsigned char ivec[16],
251 unsigned long length,
253 int number_of_rounds);
255 void AES_CTR_encrypt(const unsigned char *in,
257 const unsigned char ivec[8],
258 const unsigned char nonce[4],
259 unsigned long length,
260 const unsigned char *key,
261 int number_of_rounds);
266 #if defined(__cplusplus)