106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright (C) 2023 Eneas Ulir de Queiroz
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "uencrypt.h"
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static void check_enc_dec(const int enc)
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{
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if (enc == -1)
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return;
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fprintf(stderr, "Error: both -d and -e were specified.\n");
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exit(EXIT_FAILURE);
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}
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static void show_usage(const char* name)
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{
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fprintf(stderr, "Usage: %s: [-d | -e] [-n] -k key [-i iv] [-c cipher]\n"
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"-d = decrypt; -e = encrypt; -n = no padding\n", name);
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}
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static void uencrypt_clear_free(void *ptr, size_t len)
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{
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if (ptr) {
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memset(ptr, 0, len);
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free(ptr);
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}
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}
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int main(int argc, char *argv[])
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{
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int enc = -1;
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unsigned char *iv = NULL;
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unsigned char *key = NULL;
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long keylen = 0, ivlen = 0;
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int opt;
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int padding = 1;
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const cipher_t *cipher = get_default_cipher();
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ctx_t* ctx;
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int ret = EXIT_FAILURE;
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while ((opt = getopt(argc, argv, "c:dei:k:n")) != -1) {
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switch (opt) {
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case 'c':
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if (!(cipher = get_cipher_or_print_error(optarg)))
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exit(EXIT_FAILURE);
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break;
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case 'd':
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check_enc_dec(enc);
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enc = 0;
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break;
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case 'e':
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check_enc_dec(enc);
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enc = 1;
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break;
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case 'i':
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iv = hexstr2buf(optarg, &ivlen);
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if (iv == NULL) {
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fprintf(stderr, "Error setting IV to %s. The IV should be encoded in hex.\n",
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optarg);
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exit(EINVAL);
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}
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memset(optarg, '*', strlen(optarg));
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break;
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case 'k':
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key = hexstr2buf(optarg, &keylen);
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if (key == NULL) {
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fprintf(stderr, "Error setting key to %s. The key should be encoded in hex.\n",
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optarg);
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exit(EINVAL);
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}
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memset(optarg, '*', strlen(optarg));
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break;
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case 'n':
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padding = 0;
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break;
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default:
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show_usage(argv[0]);
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exit(EINVAL);
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}
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}
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if (ivlen != get_cipher_ivsize(cipher)) {
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fprintf(stderr, "Error: IV must be %d bytes; given IV is %ld bytes.\n",
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get_cipher_ivsize(cipher), ivlen);
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exit(EXIT_FAILURE);
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}
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if (keylen != get_cipher_keysize(cipher)) {
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fprintf(stderr, "Error: key must be %d bytes; given key is %ld bytes.\n",
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get_cipher_keysize(cipher), keylen);
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exit(EXIT_FAILURE);
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}
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ctx = create_ctx(cipher, key, iv, !!enc, padding);
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if (ctx) {
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ret = do_crypt(stdin, stdout, ctx);
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free_ctx(ctx);
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}
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uencrypt_clear_free(iv, ivlen);
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uencrypt_clear_free(key, keylen);
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return ret;
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}
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