pcompress/crypto/crypto_utils.h

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/*
* This file is a part of Pcompress, a chunked parallel multi-
* algorithm lossless compression and decompression program.
*
* Copyright (C) 2012 Moinak Ghosh. All rights reserved.
* Use is subject to license terms.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* moinakg@belenix.org, http://moinakg.wordpress.com/
*
* This program includes partly-modified public domain source
* code from the LZMA SDK: http://www.7-zip.org/sdk.html
*/
#ifndef _CRYPTO_UTILS_H
#define _CRYPTO_UTILS_H
#include <arpa/nameser_compat.h>
#include <sys/types.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
#define MAX_PW_LEN 16
#define CKSUM_MASK 0x700
#define CKSUM_MAX_BYTES 64
#define DEFAULT_CKSUM "SKEIN256"
#define ENCRYPT_FLAG 1
#define DECRYPT_FLAG 0
#define CRYPTO_ALG_AES 0x10
#define MAX_SALTLEN 64
/*
* Public checksum properties. CKSUM_MAX_BYTES must be updated if a
* newer larger checksum is added to the list.
*/
typedef enum {
CKSUM_CRC64 = 0x100,
CKSUM_SKEIN256 = 0x200,
CKSUM_SKEIN512 = 0x300,
CKSUM_SHA256 = 0x400,
CKSUM_SHA512 = 0x500
} cksum_t;
typedef struct {
void *crypto_ctx;
int crypto_alg;
int enc_dec;
uchar_t *salt;
int saltlen;
} crypto_ctx_t;
typedef struct {
void *mac_ctx;
void *mac_ctx_reinit;
int mac_cksum;
} mac_ctx_t;
/*
* Generic message digest functions.
*/
int compute_checksum(uchar_t *cksum_buf, int cksum, uchar_t *buf, ssize_t bytes);
int get_checksum_props(char *name, int *cksum, int *cksum_bytes, int *mac_bytes);
void serialize_checksum(uchar_t *checksum, uchar_t *buf, int cksum_bytes);
void deserialize_checksum(uchar_t *checksum, uchar_t *buf, int cksum_bytes);
/*
* Encryption related functions.
*/
int init_crypto(crypto_ctx_t *cctx, uchar_t *pwd, int pwd_len, int crypto_alg,
uchar_t *salt, int saltlen, uint64_t nonce, int enc_dec);
int crypto_buf(crypto_ctx_t *cctx, uchar_t *from, uchar_t *to, ssize_t bytes, uint64_t id);
uint64_t crypto_nonce(crypto_ctx_t *cctx);
void crypto_clean_pkey(crypto_ctx_t *cctx);
void cleanup_crypto(crypto_ctx_t *cctx);
int get_pw_string(char pw[MAX_PW_LEN], char *prompt, int twice);
/*
* HMAC functions.
*/
int hmac_init(mac_ctx_t *mctx, int cksum, crypto_ctx_t *cctx);
int hmac_reinit(mac_ctx_t *mctx);
int hmac_update(mac_ctx_t *mctx, uchar_t *data, size_t len);
int hmac_cleanup(mac_ctx_t *mctx);
#ifdef __cplusplus
}
#endif
#endif