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