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+/*
+ ---------------------------------------------------------------------------
+ Copyright (c) 2002, Dr Brian Gladman <                 >, Worcester, UK.
+ All rights reserved.
+
+ LICENSE TERMS
+
+ The free distribution and use of this software in both source and binary
+ form is allowed (with or without changes) provided that:
+
+   1. distributions of this source code include the above copyright
+      notice, this list of conditions and the following disclaimer;
+
+   2. distributions in binary form include the above copyright
+      notice, this list of conditions and the following disclaimer
+      in the documentation and/or other associated materials;
+
+   3. the copyright holder's name is not used to endorse products
+      built using this software without specific written permission.
+
+ ALTERNATIVELY, provided that this notice is retained in full, this product
+ may be distributed under the terms of the GNU General Public License (GPL),
+ in which case the provisions of the GPL apply INSTEAD OF those given above.
+
+ DISCLAIMER
+
+ This software is provided 'as is' with no explicit or implied warranties
+ in respect of its properties, including, but not limited to, correctness
+ and/or fitness for purpose.
+ ---------------------------------------------------------------------------
+ Issue Date: 24/01/2003
+
+ This file contains the header file for fileenc.c, which implements password
+ based file encryption and authentication using AES in CTR mode, HMAC-SHA1 
+ authentication and RFC2898 password based key derivation.
+*/
+
+#ifndef _FENC_H
+#define _FENC_H
+
+#include "aes.h"
+#include "hmac.h"
+#include "pwd2key.h"
+
+#define PASSWORD_VERIFIER
+
+#define MAX_KEY_LENGTH        32
+#define MAX_PWD_LENGTH       128
+#define MAX_SALT_LENGTH       16
+#define KEYING_ITERATIONS   1000
+
+#ifdef  PASSWORD_VERIFIER
+#define PWD_VER_LENGTH         2
+#else
+#define PWD_VER_LENGTH         0
+#endif
+
+#define GOOD_RETURN            0
+#define PASSWORD_TOO_LONG   -100
+#define BAD_MODE            -101
+
+/*
+    Field lengths (in bytes) versus File Encryption Mode (0 < mode < 4)
+
+    Mode Key Salt  MAC Overhead
+       1  16    8   10       18
+       2  24   12   10       22
+       3  32   16   10       26
+
+   The following macros assume that the mode value is correct.
+*/
+
+#define KEY_LENGTH(mode)        (8 * (mode & 3) + 8)
+#define SALT_LENGTH(mode)       (4 * (mode & 3) + 4)
+#define MAC_LENGTH(mode)        (10)
+
+/* the context for file encryption   */
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+typedef struct
+{   unsigned char   nonce[AES_BLOCK_SIZE];      /* the CTR nonce          */
+    unsigned char   encr_bfr[AES_BLOCK_SIZE];   /* encrypt buffer         */
+    aes_encrypt_ctx encr_ctx[1];                /* encryption context     */
+    hmac_ctx        auth_ctx[1];                /* authentication context */
+    unsigned int    encr_pos;                   /* block position (enc)   */
+    unsigned int    pwd_len;                    /* password length        */
+    unsigned int    mode;                       /* File encryption mode   */
+} fcrypt_ctx;
+
+/* initialise file encryption or decryption */
+
+int fcrypt_init(
+    int mode,                               /* the mode to be used (input)          */
+    const unsigned char pwd[],              /* the user specified password (input)  */
+    unsigned int pwd_len,                   /* the length of the password (input)   */
+    const unsigned char salt[],             /* the salt (input)                     */
+#ifdef PASSWORD_VERIFIER
+    unsigned char pwd_ver[PWD_VER_LENGTH],  /* 2 byte password verifier (output)    */
+#endif
+    fcrypt_ctx      cx[1]);                 /* the file encryption context (output) */
+
+/* perform 'in place' encryption or decryption and authentication               */
+
+void fcrypt_encrypt(unsigned char data[], unsigned int data_len, fcrypt_ctx cx[1]);
+void fcrypt_decrypt(unsigned char data[], unsigned int data_len, fcrypt_ctx cx[1]);
+
+/* close encryption/decryption and return the MAC value */
+/* the return value is the length of the MAC            */
+
+int fcrypt_end(unsigned char mac[],     /* the MAC value (output)   */
+               fcrypt_ctx cx[1]);       /* the context (input)      */
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif