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| 1 /*- | |
| 2 * Copyright 2009 Colin Percival | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions | |
| 7 * are met: | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer in the | |
| 12 * documentation and/or other materials provided with the distribution. | |
| 13 * | |
| 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 24 * SUCH DAMAGE. | |
| 25 */ | |
| 26 #include "scrypt_platform.h" | |
| 27 | |
| 28 #include <inttypes.h> | |
| 29 #include <stdint.h> | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <string.h> | |
| 33 #include <unistd.h> | |
| 34 | |
| 35 #include "readpass.h" | |
| 36 #include "scryptenc.h" | |
| 37 #include "warn.h" | |
| 38 | |
| 39 static void | |
| 40 usage(void) | |
| 41 { | |
| 42 | |
| 43 fprintf(stderr, | |
| 44 "usage: scrypt {enc | dec} [...] infile [outfile]\n"); | |
| 45 exit(1); | |
| 46 } | |
| 47 | |
| 48 int | |
| 49 main(int argc, char *argv[]) | |
| 50 { | |
| 51 FILE * infile = NULL; | |
| 52 FILE * outfile = stdout; | |
| 53 int dec = 0; | |
| 54 size_t maxmem = 0; | |
| 55 double maxmemfrac = 0.5; | |
| 56 double maxtime = 300.0; | |
| 57 char ch; | |
| 58 char * passwd; | |
| 59 int rc; | |
| 60 | |
| 61 #ifdef NEED_WARN_PROGNAME | |
| 62 warn_progname = "scrypt"; | |
| 63 #endif | |
| 64 | |
| 65 /* We should have "enc" or "dec" first. */ | |
| 66 if (argc < 2) | |
| 67 usage(); | |
| 68 if (strcmp(argv[1], "enc") == 0) { | |
| 69 maxmem = 0; | |
| 70 maxmemfrac = 0.125; | |
| 71 maxtime = 5.0; | |
| 72 } else if (strcmp(argv[1], "dec") == 0) { | |
| 73 dec = 1; | |
| 74 } else | |
| 75 usage(); | |
| 76 argc--; | |
| 77 argv++; | |
| 78 | |
| 79 /* Parse arguments. */ | |
| 80 while ((ch = getopt(argc, argv, "hm:M:t:")) != -1) { | |
| 81 switch (ch) { | |
| 82 case 'M': | |
| 83 maxmem = strtoumax(optarg, NULL, 0); | |
| 84 break; | |
| 85 case 'm': | |
| 86 maxmemfrac = strtod(optarg, NULL); | |
| 87 break; | |
| 88 case 't': | |
| 89 maxtime = strtod(optarg, NULL); | |
| 90 break; | |
| 91 default: | |
| 92 usage(); | |
| 93 } | |
| 94 } | |
| 95 argc -= optind; | |
| 96 argv += optind; | |
| 97 | |
| 98 /* We must have one or two parameters left. */ | |
| 99 if ((argc < 1) || (argc > 2)) | |
| 100 usage(); | |
| 101 | |
| 102 /* Open the input file. */ | |
| 103 if ((infile = fopen(argv[0], "r")) == NULL) { | |
| 104 warn("Cannot open input file: %s", argv[0]); | |
| 105 exit(1); | |
| 106 } | |
| 107 | |
| 108 /* If we have an output file, open it. */ | |
| 109 if (argc > 1) { | |
| 110 if ((outfile = fopen(argv[1], "w")) == NULL) { | |
| 111 warn("Cannot open output file: %s", argv[1]); | |
| 112 exit(1); | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 /* Prompt for a password. */ | |
| 117 if (tarsnap_readpass(&passwd, "Please enter passphrase", | |
| 118 dec ? NULL : "Please confirm passphrase", 1)) | |
| 119 exit(1); | |
| 120 | |
| 121 /* Encrypt or decrypt. */ | |
| 122 if (dec) | |
| 123 rc = scryptdec_file(infile, outfile, (uint8_t *)passwd, | |
| 124 strlen(passwd), maxmem, maxmemfrac, maxtime); | |
| 125 else | |
| 126 rc = scryptenc_file(infile, outfile, (uint8_t *)passwd, | |
| 127 strlen(passwd), maxmem, maxmemfrac, maxtime); | |
| 128 | |
| 129 /* Zero and free the password. */ | |
| 130 memset(passwd, 0, strlen(passwd)); | |
| 131 free(passwd); | |
| 132 | |
| 133 /* If we failed, print the right error message and exit. */ | |
| 134 if (rc != 0) { | |
| 135 switch (rc) { | |
| 136 case 1: | |
| 137 warn("Error determining amount of available memory"); | |
| 138 break; | |
| 139 case 2: | |
| 140 warn("Error reading clocks"); | |
| 141 break; | |
| 142 case 3: | |
| 143 warn("Error computing derived key"); | |
| 144 break; | |
| 145 case 4: | |
| 146 warn("Error reading salt"); | |
| 147 break; | |
| 148 case 5: | |
| 149 warn("OpenSSL error"); | |
| 150 break; | |
| 151 case 6: | |
| 152 warn("Error allocating memory"); | |
| 153 break; | |
| 154 case 7: | |
| 155 warnx("Input is not valid scrypt-encrypted block"); | |
| 156 break; | |
| 157 case 8: | |
| 158 warnx("Unrecognized scrypt format version"); | |
| 159 break; | |
| 160 case 9: | |
| 161 warnx("Decrypting file would require too much memory"); | |
| 162 break; | |
| 163 case 10: | |
| 164 warnx("Decrypting file would take too much CPU time"); | |
| 165 break; | |
| 166 case 11: | |
| 167 warnx("Passphrase is incorrect"); | |
| 168 break; | |
| 169 case 12: | |
| 170 warn("Error writing file: %s", | |
| 171 (argc > 1) ? argv[1] : "standard output"); | |
| 172 break; | |
| 173 case 13: | |
| 174 warn("Error reading file: %s", argv[0]); | |
| 175 break; | |
| 176 } | |
| 177 exit(1); | |
| 178 } | |
| 179 | |
| 180 return (0); | |
| 181 } | |
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