794659eb41f5ffd666b1c44c17fcad76a4eaa432
2 * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published
6 * by the Free Software Foundation.
15 #include <getopt.h> /* for getopt() */
18 #include "buffalo-lib.h"
20 #define ERR(fmt, args...) do { \
22 fprintf(stderr, "[%s] *** error: " fmt "\n", \
23 progname, ## args ); \
26 static char *progname
;
29 static char *crypt_key
= "Buffalo";
30 static char *magic
= "start";
32 static unsigned char seed
= 'O';
36 static int do_decrypt
;
39 void usage(int status
)
41 FILE *stream
= (status
!= EXIT_SUCCESS
) ? stderr
: stdout
;
43 fprintf(stream
, "Usage: %s [OPTIONS...]\n", progname
);
47 " -d decrypt instead of encrypt\n"
48 " -i <file> read input from the file <file>\n"
49 " -o <file> write output to the file <file>\n"
50 " -l use longstate {en,de}cryption method\n"
51 " -k <key> use <key> for encryption (default: Buffalo)\n"
52 " -m <magic> set magic to <magic>\n"
53 " -p <product> set product name to <product>\n"
54 " -v <version> set version to <version>\n"
55 " -h show this screen\n"
56 " -O Offset of encrypted data in file (decryption)\n"
62 static int decrypt_file(void)
66 unsigned char *buf
= NULL
;
70 src_len
= get_file_size(ifname
);
72 ERR("unable to get size of '%s'", ifname
);
76 buf
= malloc(src_len
);
78 ERR("no memory for the buffer");
82 err
= read_file_to_buf(ifname
, buf
, src_len
);
84 ERR("unable to read from file '%s'", ifname
);
88 memset(&ep
, '\0', sizeof(ep
));
89 ep
.key
= (unsigned char *) crypt_key
;
90 ep
.longstate
= longstate
;
92 err
= decrypt_buf(&ep
, buf
+ offset
, src_len
- offset
);
94 ERR("unable to decrypt '%s'", ifname
);
98 printf("Magic\t\t: '%s'\n", ep
.magic
);
99 printf("Seed\t\t: 0x%02x\n", ep
.seed
);
100 printf("Product\t\t: '%s'\n", ep
.product
);
101 printf("Version\t\t: '%s'\n", ep
.version
);
102 printf("Data len\t: %u\n", ep
.datalen
);
103 printf("Checksum\t: 0x%08x\n", ep
.csum
);
105 err
= write_buf_to_file(ofname
, buf
+ offset
, ep
.datalen
);
107 ERR("unable to write to file '%s'", ofname
);
118 static int encrypt_file(void)
128 src_len
= get_file_size(ifname
);
130 ERR("unable to get size of '%s'", ifname
);
134 totlen
= enc_compute_buf_len(product
, version
, src_len
);
135 hdrlen
= enc_compute_header_len(product
, version
);
137 buf
= malloc(totlen
);
139 ERR("no memory for the buffer");
143 err
= read_file_to_buf(ifname
, &buf
[hdrlen
], src_len
);
145 ERR("unable to read from file '%s'", ofname
);
149 memset(&ep
, '\0', sizeof(ep
));
150 ep
.key
= (unsigned char *) crypt_key
;
152 ep
.longstate
= longstate
;
153 ep
.csum
= buffalo_csum(src_len
, &buf
[hdrlen
], src_len
);
154 ep
.datalen
= src_len
;
155 strcpy((char *) ep
.magic
, magic
);
156 strcpy((char *) ep
.product
, product
);
157 strcpy((char *) ep
.version
, version
);
159 err
= encrypt_buf(&ep
, buf
, &buf
[hdrlen
]);
161 ERR("invalid input file");
165 err
= write_buf_to_file(ofname
, buf
, totlen
);
167 ERR("unable to write to file '%s'", ofname
);
179 static int check_params(void)
183 if (ifname
== NULL
) {
184 ERR("no input file specified");
188 if (ofname
== NULL
) {
189 ERR("no output file specified");
193 if (crypt_key
== NULL
) {
194 ERR("no key specified");
196 } else if (strlen(crypt_key
) > BCRYPT_MAX_KEYLEN
) {
197 ERR("key '%s' is too long", crypt_key
);
201 if (strlen(magic
) != (ENC_MAGIC_LEN
- 1)) {
202 ERR("length of magic must be %d", ENC_MAGIC_LEN
- 1);
207 if (product
== NULL
) {
208 ERR("no product specified");
212 if (version
== NULL
) {
213 ERR("no version specified");
217 if (strlen(product
) > (ENC_PRODUCT_LEN
- 1)) {
218 ERR("product name '%s' is too long", product
);
222 if (strlen(version
) > (ENC_VERSION_LEN
- 1)) {
223 ERR("version '%s' is too long", version
);
234 int main(int argc
, char *argv
[])
236 int res
= EXIT_FAILURE
;
239 progname
= basename(argv
[0]);
244 c
= getopt(argc
, argv
, "adi:m:o:hlp:v:k:O:r:s:");
274 seed
= strtoul(optarg
, NULL
, 16);
277 offset
= strtoul(optarg
, NULL
, 0);
288 err
= check_params();
293 err
= decrypt_file();
295 err
= encrypt_file();