1/* 2 * Copyright (c) 2008 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include <krb5-types.h> /* should really be stdint.h */ 35#include <hcrypto/evp.h> 36 37#include <stdio.h> 38#include <stdlib.h> 39#include <string.h> 40#include <err.h> 41#include <assert.h> 42 43#include "roken.h" 44 45/* key and initial vector */ 46static char key[16] = 47 "\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4" 48 "\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4"; 49static char ivec[16] = 50 "\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4" 51 "\xaa\xbb\x45\xd4\xaa\xbb\x45\xd4"; 52 53static void 54usage(int exit_code) __attribute__((noreturn)); 55 56static void 57usage(int exit_code) 58{ 59 printf("usage: %s in out\n", getprogname()); 60 exit(exit_code); 61} 62 63 64int 65main(int argc, char **argv) 66{ 67 int encryptp = 1; 68 const char *ifn = NULL, *ofn = NULL; 69 FILE *in, *out; 70 void *ibuf, *obuf; 71 int ilen, olen; 72 size_t block_size = 0; 73 const EVP_CIPHER *c = EVP_aes_128_cbc(); 74 EVP_CIPHER_CTX ctx; 75 int ret; 76 77 setprogname(argv[0]); 78 79 if (argc == 2) { 80 if (strcmp(argv[1], "--version") == 0) { 81 printf("version"); 82 exit(0); 83 } 84 if (strcmp(argv[1], "--help") == 0) 85 usage(0); 86 usage(1); 87 } else if (argc == 4) { 88 block_size = atoi(argv[1]); 89 if (block_size == 0) 90 errx(1, "invalid blocksize %s", argv[1]); 91 ifn = argv[2]; 92 ofn = argv[3]; 93 } else 94 usage(1); 95 96 in = fopen(ifn, "r"); 97 if (in == NULL) 98 errx(1, "failed to open input file"); 99 out = fopen(ofn, "w+"); 100 if (out == NULL) 101 errx(1, "failed to open output file"); 102 103 /* Check that key and ivec are long enough */ 104 assert(EVP_CIPHER_key_length(c) <= sizeof(key)); 105 assert(EVP_CIPHER_iv_length(c) <= sizeof(ivec)); 106 107 /* 108 * Allocate buffer, the output buffer is at least 109 * EVP_CIPHER_block_size() longer 110 */ 111 ibuf = malloc(block_size); 112 obuf = malloc(block_size + EVP_CIPHER_block_size(c)); 113 114 /* 115 * Init the memory used for EVP_CIPHER_CTX and set the key and 116 * ivec. 117 */ 118 EVP_CIPHER_CTX_init(&ctx); 119 EVP_CipherInit_ex(&ctx, c, NULL, key, ivec, encryptp); 120 121 /* read in buffer */ 122 while ((ilen = fread(ibuf, 1, block_size, in)) > 0) { 123 /* encrypto/decrypt */ 124 ret = EVP_CipherUpdate(&ctx, obuf, &olen, ibuf, ilen); 125 if (ret != 1) { 126 EVP_CIPHER_CTX_cleanup(&ctx); 127 errx(1, "EVP_CipherUpdate failed"); 128 } 129 /* write out to output file */ 130 fwrite(obuf, 1, olen, out); 131 } 132 /* done reading */ 133 fclose(in); 134 135 /* clear up any last bytes left in the output buffer */ 136 ret = EVP_CipherFinal_ex(&ctx, obuf, &olen); 137 EVP_CIPHER_CTX_cleanup(&ctx); 138 if (ret != 1) 139 errx(1, "EVP_CipherFinal_ex failed"); 140 141 /* write the last bytes out and close */ 142 fwrite(obuf, 1, olen, out); 143 fclose(out); 144 145 return 0; 146} 147