get rid of unused iterator hook functions
[strongswan.git] / src / libcrypto / libaes / aes.h
1 // I retain copyright in this code but I encourage its free use provided
2 // that I don't carry any responsibility for the results. I am especially
3 // happy to see it used in free and open source software. If you do use
4 // it I would appreciate an acknowledgement of its origin in the code or
5 // the product that results and I would also appreciate knowing a little
6 // about the use to which it is being put. I am grateful to Frank Yellin
7 // for some ideas that are used in this implementation.
8 //
9 // Dr B. R. Gladman <brg@gladman.uk.net> 6th April 2001.
10 //
11 // This is an implementation of the AES encryption algorithm (Rijndael)
12 // designed by Joan Daemen and Vincent Rijmen. This version is designed
13 // to provide both fixed and dynamic block and key lengths and can also
14 // run with either big or little endian internal byte order (see aes.h).
15 // It inputs block and key lengths in bytes with the legal values being
16 // 16, 24 and 32.
17
18 /*
19 * Modified by Jari Ruusu, May 1 2001
20 * - Fixed some compile warnings, code was ok but gcc warned anyway.
21 * - Changed basic types: byte -> unsigned char, word -> u_int32_t
22 * - Major name space cleanup: Names visible to outside now begin
23 * with "aes_" or "AES_". A lot of stuff moved from aes.h to aes.c
24 * - Removed C++ and DLL support as part of name space cleanup.
25 * - Eliminated unnecessary recomputation of tables. (actual bug fix)
26 * - Merged precomputed constant tables to aes.c file.
27 * - Removed data alignment restrictions for portability reasons.
28 * - Made block and key lengths accept bit count (128/192/256)
29 * as well byte count (16/24/32).
30 * - Removed all error checks. This change also eliminated the need
31 * to preinitialize the context struct to zero.
32 * - Removed some totally unused constants.
33 */
34
35 #ifndef _AES_H
36 #define _AES_H
37
38 #if defined(__linux__) && defined(__KERNEL__)
39 # include <linux/types.h>
40 #else
41 # include <sys/types.h>
42 #endif
43
44 // CONFIGURATION OPTIONS (see also aes.c)
45 //
46 // Define AES_BLOCK_SIZE to set the cipher block size (16, 24 or 32) or
47 // leave this undefined for dynamically variable block size (this will
48 // result in much slower code).
49 // IMPORTANT NOTE: AES_BLOCK_SIZE is in BYTES (16, 24, 32 or undefined). If
50 // left undefined a slower version providing variable block length is compiled
51
52 #define AES_BLOCK_SIZE 16
53
54 // The number of key schedule words for different block and key lengths
55 // allowing for method of computation which requires the length to be a
56 // multiple of the key length
57 //
58 // Nk = 4 6 8
59 // -------------
60 // Nb = 4 | 60 60 64
61 // 6 | 96 90 96
62 // 8 | 120 120 120
63
64 #if !defined(AES_BLOCK_SIZE) || (AES_BLOCK_SIZE == 32)
65 #define AES_KS_LENGTH 120
66 #define AES_RC_LENGTH 29
67 #else
68 #define AES_KS_LENGTH 4 * AES_BLOCK_SIZE
69 #define AES_RC_LENGTH (9 * AES_BLOCK_SIZE) / 8 - 8
70 #endif
71
72 typedef struct
73 {
74 u_int32_t aes_Nkey; // the number of words in the key input block
75 u_int32_t aes_Nrnd; // the number of cipher rounds
76 u_int32_t aes_e_key[AES_KS_LENGTH]; // the encryption key schedule
77 u_int32_t aes_d_key[AES_KS_LENGTH]; // the decryption key schedule
78 #if !defined(AES_BLOCK_SIZE)
79 u_int32_t aes_Ncol; // the number of columns in the cipher state
80 #endif
81 } aes_context;
82
83 // THE CIPHER INTERFACE
84
85 #if !defined(AES_BLOCK_SIZE)
86 extern void aes_set_blk(aes_context *, const int);
87 #endif
88 extern void aes_set_key(aes_context *, const unsigned char [], const int, const int);
89 extern void aes_encrypt(const aes_context *, const unsigned char [], unsigned char []);
90 extern void aes_decrypt(const aes_context *, const unsigned char [], unsigned char []);
91
92 // The block length inputs to aes_set_block and aes_set_key are in numbers
93 // of bytes or bits. The calls to subroutines must be made in the above
94 // order but multiple calls can be made without repeating earlier calls
95 // if their parameters have not changed.
96
97 #endif // _AES_H