libcryfs/vendor/scrypt/scrypt-1.2.0/scrypt/main.c
2016-02-11 14:01:59 +01:00

187 lines
4.4 KiB
C

/*-
* Copyright 2009 Colin Percival
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "scrypt_platform.h"
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "insecure_memzero.h"
#include "readpass.h"
#include "scryptenc.h"
#include "warnp.h"
static void
usage(void)
{
fprintf(stderr,
"usage: scrypt {enc | dec} [...] infile [outfile]\n");
exit(1);
}
int
main(int argc, char *argv[])
{
FILE * infile;
FILE * outfile;
int dec = 0;
size_t maxmem = 0;
double maxmemfrac = 0.5;
double maxtime = 300.0;
int ch;
char * passwd;
int rc;
WARNP_INIT;
/* We should have "enc" or "dec" first. */
if (argc < 2)
usage();
if (strcmp(argv[1], "enc") == 0) {
maxmem = 0;
maxmemfrac = 0.125;
maxtime = 5.0;
} else if (strcmp(argv[1], "dec") == 0) {
dec = 1;
} else
usage();
argc--;
argv++;
/* Parse arguments. */
while ((ch = getopt(argc, argv, "hm:M:t:")) != -1) {
switch (ch) {
case 'M':
maxmem = strtoumax(optarg, NULL, 0);
break;
case 'm':
maxmemfrac = strtod(optarg, NULL);
break;
case 't':
maxtime = strtod(optarg, NULL);
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
/* We must have one or two parameters left. */
if ((argc < 1) || (argc > 2))
usage();
/* If the input isn't stdin, open the file. */
if (strcmp(argv[0], "-")) {
if ((infile = fopen(argv[0], "rb")) == NULL) {
warnp("Cannot open input file: %s", argv[0]);
exit(1);
}
} else {
infile = stdin;
}
/* If we have an output file, open it. */
if (argc > 1) {
if ((outfile = fopen(argv[1], "wb")) == NULL) {
warnp("Cannot open output file: %s", argv[1]);
exit(1);
}
} else {
outfile = stdout;
}
/* Prompt for a password. */
if (readpass(&passwd, "Please enter passphrase",
dec ? NULL : "Please confirm passphrase", 1))
exit(1);
/* Encrypt or decrypt. */
if (dec)
rc = scryptdec_file(infile, outfile, (uint8_t *)passwd,
strlen(passwd), maxmem, maxmemfrac, maxtime);
else
rc = scryptenc_file(infile, outfile, (uint8_t *)passwd,
strlen(passwd), maxmem, maxmemfrac, maxtime);
/* Zero and free the password. */
insecure_memzero(passwd, strlen(passwd));
free(passwd);
/* If we failed, print the right error message and exit. */
if (rc != 0) {
switch (rc) {
case 1:
warnp("Error determining amount of available memory");
break;
case 2:
warnp("Error reading clocks");
break;
case 3:
warnp("Error computing derived key");
break;
case 4:
warnp("Error reading salt");
break;
case 5:
warnp("OpenSSL error");
break;
case 6:
warnp("Error allocating memory");
break;
case 7:
warn0("Input is not valid scrypt-encrypted block");
break;
case 8:
warn0("Unrecognized scrypt format version");
break;
case 9:
warn0("Decrypting file would require too much memory");
break;
case 10:
warn0("Decrypting file would take too much CPU time");
break;
case 11:
warn0("Passphrase is incorrect");
break;
case 12:
warnp("Error writing file: %s",
(argc > 1) ? argv[1] : "standard output");
break;
case 13:
warnp("Error reading file: %s", argv[0]);
break;
}
exit(1);
}
return (0);
}