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/*
* Copyright (c) 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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 <krb5-types.h> /* should really be stdint.h */
#include <hcrypto/evp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <assert.h>
#include "roken.h"
/* key and initial vector */
static char key[16] =
"\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4"
"\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4";
static char ivec[16] =
"\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4"
"\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4";
static void
usage(int exit_code) __attribute__((noreturn));
static void
usage(int exit_code)
{
printf("usage: %s in out\n", getprogname());
exit(exit_code);
}
int
main(int argc, char **argv)
{
int encryptp = 1;
const char *ifn = NULL, *ofn = NULL;
FILE *in, *out;
void *ibuf, *obuf;
int ilen, olen;
size_t block_size = 0;
const EVP_CIPHER *c = EVP_aes_128_cbc();
EVP_CIPHER_CTX ctx;
int ret;
setprogname(argv[0]);
if (argc == 2) {
if (strcmp(argv[1], "--version") == 0) {
printf("version");
exit(0);
}
if (strcmp(argv[1], "--help") == 0)
usage(0);
usage(1);
} else if (argc == 4) {
block_size = atoi(argv[1]);
if (block_size == 0)
errx(1, "invalid blocksize %s", argv[1]);
ifn = argv[2];
ofn = argv[3];
} else
usage(1);
in = fopen(ifn, "r");
if (in == NULL)
errx(1, "failed to open input file");
out = fopen(ofn, "w+");
if (out == NULL)
errx(1, "failed to open output file");
/* Check that key and ivec are long enough */
assert(EVP_CIPHER_key_length(c) <= sizeof(key));
assert(EVP_CIPHER_iv_length(c) <= sizeof(ivec));
/*
* Allocate buffer, the output buffer is at least
* EVP_CIPHER_block_size() longer
*/
ibuf = malloc(block_size);
obuf = malloc(block_size + EVP_CIPHER_block_size(c));
/*
* Init the memory used for EVP_CIPHER_CTX and set the key and
* ivec.
*/
EVP_CIPHER_CTX_init(&ctx);
EVP_CipherInit_ex(&ctx, c, NULL, key, ivec, encryptp);
/* read in buffer */
while ((ilen = fread(ibuf, 1, block_size, in)) > 0) {
/* encrypto/decrypt */
ret = EVP_CipherUpdate(&ctx, obuf, &olen, ibuf, ilen);
if (ret != 1) {
EVP_CIPHER_CTX_cleanup(&ctx);
errx(1, "EVP_CipherUpdate failed");
}
/* write out to output file */
fwrite(obuf, 1, olen, out);
}
/* done reading */
fclose(in);
/* clear up any last bytes left in the output buffer */
ret = EVP_CipherFinal_ex(&ctx, obuf, &olen);
EVP_CIPHER_CTX_cleanup(&ctx);
if (ret != 1)
errx(1, "EVP_CipherFinal_ex failed");
/* write the last bytes out and close */
fwrite(obuf, 1, olen, out);
fclose(out);
return 0;
}
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