135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/*
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* This file is a part of Pcompress, a chunked parallel multi-
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* algorithm lossless compression and decompression program.
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*
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* Copyright (C) 2012-2013 Moinak Ghosh. All rights reserved.
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* Use is subject to license terms.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program.
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* If not, see <http://www.gnu.org/licenses/>.
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*
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* moinakg@belenix.org, http://moinakg.wordpress.com/
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*
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*/
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#ifndef _CRYPTO_UTILS_H
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#define _CRYPTO_UTILS_H
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#include <arpa/nameser_compat.h>
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#include <sys/types.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define MAX_PW_LEN 16
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#define CKSUM_MASK 0x700
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#define CKSUM_MAX_BYTES 64
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#define DEFAULT_CKSUM "BLAKE256"
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/*
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* Default key length for Encryption and Decryption
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*/
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#ifndef DEFAULT_KEYLEN
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#define DEFAULT_KEYLEN 32
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#define MAX_KEYLEN 32
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#else
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#define MAX_KEYLEN DEFAULT_KEYLEN
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#endif
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#define OLD_KEYLEN 16
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#define ENCRYPT_FLAG 1
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#define DECRYPT_FLAG 0
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#define CRYPTO_ALG_AES 0x10
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#define CRYPTO_ALG_SALSA20 0x20
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#define MAX_SALTLEN 64
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#define MAX_NONCE 32
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#define KECCAK_MAX_SEG (2305843009213693950ULL)
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/*
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* Public checksum properties. CKSUM_MAX_BYTES must be updated if a
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* newer larger checksum is added to the list.
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*/
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typedef enum {
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CKSUM_CRC64 = 0x100,
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CKSUM_BLAKE256 = 0x200,
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CKSUM_BLAKE512 = 0x300,
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CKSUM_SHA256 = 0x400,
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CKSUM_SHA512 = 0x500,
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CKSUM_KECCAK256 = 0x600,
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CKSUM_KECCAK512 = 0x700,
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/*
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* Backwards compatibility options. SKEIN in release 1.2 was replaced with
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* Blake2 from 1.3 onwards (for sheer speed of Blake2). We want to be able
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* to decode archives created with 1.2. New archives do not use SKEIN.
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*/
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CKSUM_SKEIN256 = 0x800,
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CKSUM_SKEIN512 = 0x900,
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CKSUM_INVALID = 0
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} cksum_t;
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typedef struct {
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void *crypto_ctx;
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int crypto_alg;
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int enc_dec;
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uchar_t *salt;
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uchar_t *pkey;
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int saltlen;
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int keylen;
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} crypto_ctx_t;
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typedef struct {
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void *mac_ctx;
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void *mac_ctx_reinit;
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int mac_cksum;
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} mac_ctx_t;
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/*
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* Generic message digest functions.
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*/
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int compute_checksum(uchar_t *cksum_buf, int cksum, uchar_t *buf, uint64_t bytes, int mt);
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void list_checksums(FILE *strm, char *pad);
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int get_checksum_props(const char *name, int *cksum, int *cksum_bytes,
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int *mac_bytes, int accept_compatible);
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void serialize_checksum(uchar_t *checksum, uchar_t *buf, int cksum_bytes);
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void deserialize_checksum(uchar_t *checksum, uchar_t *buf, int cksum_bytes);
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/*
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* Encryption related functions.
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*/
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int init_crypto(crypto_ctx_t *cctx, uchar_t *pwd, int pwd_len, int crypto_alg,
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uchar_t *salt, int saltlen, int keylen, uchar_t *nonce, int enc_dec);
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int crypto_buf(crypto_ctx_t *cctx, uchar_t *from, uchar_t *to, uint64_t bytes, uint64_t id);
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uchar_t *crypto_nonce(crypto_ctx_t *cctx);
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void crypto_clean_pkey(crypto_ctx_t *cctx);
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void cleanup_crypto(crypto_ctx_t *cctx);
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int get_pw_string(uchar_t pw[MAX_PW_LEN], const char *prompt, int twice);
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int get_crypto_alg(char *name);
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int geturandom_bytes(uchar_t *rbytes, int nbytes);
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/*
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* HMAC functions.
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*/
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int hmac_init(mac_ctx_t *mctx, int cksum, crypto_ctx_t *cctx);
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int hmac_reinit(mac_ctx_t *mctx);
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int hmac_update(mac_ctx_t *mctx, uchar_t *data, uint64_t len);
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int hmac_final(mac_ctx_t *mctx, uchar_t *hash, unsigned int *len);
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int hmac_cleanup(mac_ctx_t *mctx);
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#ifdef __cplusplus
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}
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#endif
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#endif
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