AbZip  1.0.0
aes.h
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;
80 
81 typedef struct
82 { uint_32t ks[KS_LENGTH];
83  aes_inf inf;
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
Definition: aes.h:71
Definition: aes.h:81
Definition: aes.h:76