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+// I retain copyright in this code but I encourage its free use provided
+// that I don't carry any responsibility for the results. I am especially 
+// happy to see it used in free and open source software. If you do use 
+// it I would appreciate an acknowledgement of its origin in the code or
+// the product that results and I would also appreciate knowing a little
+// about the use to which it is being put. I am grateful to Frank Yellin
+// for some ideas that are used in this implementation.
+//
+// Dr B. R. Gladman <brg@gladman.uk.net> 6th April 2001.
+//
+// This is an implementation of the AES encryption algorithm (Rijndael)
+// designed by Joan Daemen and Vincent Rijmen. This version is designed
+// to provide both fixed and dynamic block and key lengths and can also 
+// run with either big or little endian internal byte order (see aes.h). 
+// It inputs block and key lengths in bytes with the legal values being 
+// 16, 24 and 32.
+
+/*
+ * Modified by Jari Ruusu,  May 1 2001
+ *  - Fixed some compile warnings, code was ok but gcc warned anyway.
+ *  - Changed basic types: byte -> unsigned char, word -> u_int32_t
+ *  - Major name space cleanup: Names visible to outside now begin
+ *    with "aes_" or "AES_". A lot of stuff moved from aes.h to aes.c
+ *  - Removed C++ and DLL support as part of name space cleanup.
+ *  - Eliminated unnecessary recomputation of tables. (actual bug fix)
+ *  - Merged precomputed constant tables to aes.c file.
+ *  - Removed data alignment restrictions for portability reasons.
+ *  - Made block and key lengths accept bit count (128/192/256)
+ *    as well byte count (16/24/32).
+ *  - Removed all error checks. This change also eliminated the need
+ *    to preinitialize the context struct to zero.
+ *  - Removed some totally unused constants.
+ */
+
+#ifndef _AES_H
+#define _AES_H
+
+#if defined(__linux__) && defined(__KERNEL__)
+#  include <linux/types.h>
+#else 
+#  include <sys/types.h>
+#endif
+
+// CONFIGURATION OPTIONS (see also aes.c)
+//
+// Define AES_BLOCK_SIZE to set the cipher block size (16, 24 or 32) or
+// leave this undefined for dynamically variable block size (this will
+// result in much slower code).
+// IMPORTANT NOTE: AES_BLOCK_SIZE is in BYTES (16, 24, 32 or undefined). If
+// left undefined a slower version providing variable block length is compiled
+
+#define AES_BLOCK_SIZE  16
+
+// The number of key schedule words for different block and key lengths
+// allowing for method of computation which requires the length to be a
+// multiple of the key length
+//
+// Nk =       4   6   8
+//        -------------
+// Nb = 4 |  60  60  64
+//      6 |  96  90  96
+//      8 | 120 120 120
+
+#if !defined(AES_BLOCK_SIZE) || (AES_BLOCK_SIZE == 32)
+#define AES_KS_LENGTH   120
+#define AES_RC_LENGTH    29
+#else
+#define AES_KS_LENGTH   4 * AES_BLOCK_SIZE
+#define AES_RC_LENGTH   (9 * AES_BLOCK_SIZE) / 8 - 8
+#endif
+
+typedef struct
+{
+    u_int32_t    aes_Nkey;      // the number of words in the key input block
+    u_int32_t    aes_Nrnd;      // the number of cipher rounds
+    u_int32_t    aes_e_key[AES_KS_LENGTH];   // the encryption key schedule
+    u_int32_t    aes_d_key[AES_KS_LENGTH];   // the decryption key schedule
+#if !defined(AES_BLOCK_SIZE)
+    u_int32_t    aes_Ncol;      // the number of columns in the cipher state
+#endif
+} aes_context;
+
+// THE CIPHER INTERFACE
+
+#if !defined(AES_BLOCK_SIZE)
+extern void aes_set_blk(aes_context *, const int);
+#endif
+extern void aes_set_key(aes_context *, const unsigned char [], const int, const int);
+extern void aes_encrypt(const aes_context *, const unsigned char [], unsigned char []);
+extern void aes_decrypt(const aes_context *, const unsigned char [], unsigned char []);
+
+// The block length inputs to aes_set_block and aes_set_key are in numbers
+// of bytes or bits.  The calls to subroutines must be made in the above
+// order but multiple calls can be made without repeating earlier calls
+// if their parameters have not changed.
+
+#endif  // _AES_H