237 lines
6.8 KiB
C
237 lines
6.8 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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/*-
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* Copyright 2007-2009 Colin Percival
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file was originally written by Colin Percival as part of the Tarsnap
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* online backup system.
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*/
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#ifndef __STDC_FORMAT_MACROS
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#define __STDC_FORMAT_MACROS 1
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <openssl/rand.h>
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#include <openssl/evp.h>
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#include <crypto_scrypt.h>
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#include <crypto_aesctr.h>
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#include <utils.h>
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#include "crypto_aes.h"
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extern int geturandom_bytes(uchar_t *rbytes, int nbytes);
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extern uint64_t lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc);
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extern int vpaes_set_encrypt_key(const unsigned char *userKey, int bits, AES_KEY *key);
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extern void vpaes_encrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key);
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extern int aesni_set_encrypt_key(const unsigned char *userKey, int bits, AES_KEY *key);
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extern void aesni_encrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key);
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setkey_func_ptr enc_setkey;
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encrypt_func_ptr enc_encrypt;
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void
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aes_module_init(processor_info_t *pc)
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{
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enc_setkey = AES_set_encrypt_key;
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enc_encrypt = AES_encrypt;
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if (pc->proc_type == PROC_X64_INTEL || pc->proc_type == PROC_X64_AMD) {
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if (pc->aes_avail) {
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enc_setkey = aesni_set_encrypt_key;
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enc_encrypt = aesni_encrypt;
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} else if (pc->sse_level >= 3 && pc->sse_sub_level >= 1) {
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enc_setkey = vpaes_set_encrypt_key;
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enc_encrypt = vpaes_encrypt;
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}
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}
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}
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int
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aes_init(aes_ctx_t *ctx, uchar_t *salt, int saltlen, uchar_t *pwd, int pwd_len,
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uint64_t nonce, int enc)
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{
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struct timespec tp;
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uint64_t tv;
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uchar_t num[25];
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uchar_t IV[32];
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uchar_t *key = ctx->pkey;
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#ifndef _USE_PBK
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int logN;
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uint32_t r, p;
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uint64_t N;
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pickparams(&logN, &r, &p);
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N = (uint64_t)(1) << logN;
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if (crypto_scrypt(pwd, pwd_len, salt, saltlen, N, r, p, key, ctx->keylen)) {
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log_msg(LOG_ERR, 0, "Scrypt failed\n");
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return (-1);
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}
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#else
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rv = PKCS5_PBKDF2_HMAC(pwd, pwd_len, salt, saltlen, PBE_ROUNDS, EVP_sha256(),
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ctx->keylen, key);
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if (rv != ctx->keylen) {
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log_msg(LOG_ERR, 0, "Key size is %d bytes - should be %d bits\n", i, ctx->keylen);
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return (-1);
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}
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#endif
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if (enc) {
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enc_setkey(key, (ctx->keylen << 3), &(ctx->key));
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// Derive 64-bit nonce
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if (RAND_status() != 1 || RAND_bytes((uchar_t *)&(ctx->nonce), 8) != 1) {
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if (geturandom_bytes((uchar_t *)&(ctx->nonce), 8) != 0) {
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if (clock_gettime(CLOCK_MONOTONIC, &tp) == -1) {
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time((time_t *)&tv);
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} else {
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tv = tp.tv_sec * 1000UL + tp.tv_nsec;
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}
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sprintf((char *)num, "%" PRIu64, tv);
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PKCS5_PBKDF2_HMAC((const char *)num, strlen((char *)num), salt,
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saltlen, PBE_ROUNDS, EVP_sha256(), 32, IV);
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ctx->nonce = lzma_crc64(IV, 32, 0);
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} else {
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tv = ntohll(ctx->nonce);
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ctx->nonce = tv;
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}
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} else {
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/*
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* Random bytes are treated as being in big-endian format.
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*/
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tv = ntohll(ctx->nonce);
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ctx->nonce = tv;
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}
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// Nullify stack components
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memset(num, 0, 25);
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memset(IV, 0, 32);
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memset(&tp, 0, sizeof (tp));
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tv = 0;
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} else {
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ctx->nonce = nonce;
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enc_setkey(key, (ctx->keylen << 3), &(ctx->key));
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}
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return (0);
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}
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int
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aes_encrypt(aes_ctx_t *ctx, uchar_t *plaintext, uchar_t *ciphertext, uint64_t len, uint64_t id) {
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AES_KEY key;
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uchar_t *k1, *k2;
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struct crypto_aesctr *strm;
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int i;
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k1 = (uchar_t *)&(ctx->key);
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k2 = (uchar_t *)&key;
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for (i=0; i<sizeof (key); i++)
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k2[i] = k1[i];
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// Init counter mode AES from scrypt
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strm = crypto_aesctr_init(&key, ctx->nonce + id);
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if (!strm) {
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log_msg(LOG_ERR, 0, "Failed to init counter mode AES\n");
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return (-1);
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}
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crypto_aesctr_stream(strm, plaintext, ciphertext, len);
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crypto_aesctr_free(strm);
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strm = NULL;
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k1 = NULL;
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k2 = NULL;
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memset(&key, 0, sizeof (key));
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return (0);
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}
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int
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aes_decrypt(aes_ctx_t *ctx, uchar_t *ciphertext, uchar_t *plaintext, uint64_t len, uint64_t id) {
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AES_KEY key;
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uchar_t *k1, *k2;
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struct crypto_aesctr *strm;
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int i;
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k1 = (uchar_t *)&(ctx->key);
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k2 = (uchar_t *)&key;
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for (i=0; i<sizeof (key); i++)
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k2[i] = k1[i];
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// Init counter mode AES from scrypt
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strm = crypto_aesctr_init(&key, ctx->nonce + id);
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if (!strm) {
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log_msg(LOG_ERR, 0, "Failed to init counter mode AES\n");
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return (-1);
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}
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crypto_aesctr_stream(strm, ciphertext, plaintext, len);
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crypto_aesctr_free(strm);
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strm = NULL;
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k1 = NULL;
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k2 = NULL;
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memset(&key, 0, sizeof (key));
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return (0);
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}
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uchar_t *
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aes_nonce(aes_ctx_t *ctx)
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{
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return ((uchar_t *)&(ctx->nonce));
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}
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void
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aes_clean_pkey(aes_ctx_t *ctx)
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{
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memset(ctx->pkey, 0, ctx->keylen);
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}
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void
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aes_cleanup(aes_ctx_t *ctx)
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{
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memset((void *)(&ctx->key), 0, sizeof (ctx->key));
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ctx->nonce = 0;
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free(ctx);
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}
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