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/*
* Copyright (C) 2022 Red Hat, Inc.
*
* Author: Daiki Ueno
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>
*
*/
#include "config.h"
#include <gnutls/crypto.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include "utils.h"
static void tls_log_func(int level, const char *str)
{
fprintf(stderr, "<%d>| %s", level, str);
}
#define CLAMP(x, b) (((x) + (b)) / (b)) * (b)
static void start(gnutls_cipher_algorithm_t algo, size_t plaintext_size,
unsigned int flags)
{
int ret;
gnutls_cipher_hd_t ch;
uint8_t key16[64];
uint8_t iv16[32];
uint8_t plaintext[128];
uint8_t ciphertext[128];
size_t block_size;
size_t size;
gnutls_datum_t key, iv;
success("%s %zu %u\n", gnutls_cipher_get_name(algo), plaintext_size,
flags);
block_size = gnutls_cipher_get_block_size(algo);
key.data = key16;
key.size = gnutls_cipher_get_key_size(algo);
assert(key.size <= sizeof(key16));
iv.data = iv16;
iv.size = gnutls_cipher_get_iv_size(algo);
assert(iv.size <= sizeof(iv16));
memset(iv.data, 0xff, iv.size);
memset(key.data, 0xfe, key.size);
memset(plaintext, 0xfa, sizeof(plaintext));
ret = gnutls_cipher_init(&ch, algo, &key, &iv);
if (ret < 0) {
fail("gnutls_cipher_init failed\n");
}
/* Check overflow if PKCS#7 is requested */
if (flags & GNUTLS_CIPHER_PADDING_PKCS7) {
ret = gnutls_cipher_encrypt3(ch, plaintext, SIZE_MAX, NULL,
&size, flags);
if (ret != GNUTLS_E_INVALID_REQUEST) {
fail("gnutls_cipher_encrypt3 succeeded\n");
}
}
/* Get the ciphertext size */
ret = gnutls_cipher_encrypt3(ch, plaintext, plaintext_size, NULL, &size,
flags);
if (ret < 0) {
fail("gnutls_cipher_encrypt3 failed\n");
}
if (flags & GNUTLS_CIPHER_PADDING_PKCS7) {
if (size <= plaintext_size) {
fail("no padding appended\n");
}
if (size != CLAMP(plaintext_size, block_size)) {
fail("size does not match: %zu (expected %zu)\n", size,
CLAMP(plaintext_size, block_size));
}
} else {
if (size != plaintext_size) {
fail("size does not match: %zu (expected %zu)\n", size,
plaintext_size);
}
}
/* Encrypt with padding */
ret = gnutls_cipher_encrypt3(ch, plaintext, plaintext_size, ciphertext,
&size, flags);
if (ret < 0) {
fail("gnutls_cipher_encrypt3 failed\n");
}
/* Decrypt with padding */
ret = gnutls_cipher_decrypt3(ch, ciphertext, size, ciphertext, &size,
flags);
if (ret < 0) {
fail("gnutls_cipher_encrypt3 failed\n");
}
if (size != plaintext_size) {
fail("size does not match: %zu (expected %zu)\n", size,
plaintext_size);
}
if (memcmp(ciphertext, plaintext, size) != 0) {
fail("plaintext does not match\n");
}
gnutls_cipher_deinit(ch);
}
void doit(void)
{
int ret;
gnutls_global_set_log_function(tls_log_func);
if (debug) {
gnutls_global_set_log_level(4711);
}
ret = global_init();
if (ret < 0) {
fail("Cannot initialize library\n");
}
start(GNUTLS_CIPHER_AES_128_CBC, 0, GNUTLS_CIPHER_PADDING_PKCS7);
start(GNUTLS_CIPHER_AES_128_CBC, 11, GNUTLS_CIPHER_PADDING_PKCS7);
start(GNUTLS_CIPHER_AES_128_CBC, 77, GNUTLS_CIPHER_PADDING_PKCS7);
start(GNUTLS_CIPHER_AES_128_CBC, 80, GNUTLS_CIPHER_PADDING_PKCS7);
start(GNUTLS_CIPHER_AES_128_CBC, 0, 0);
start(GNUTLS_CIPHER_AES_128_CBC, 80, 0);
gnutls_global_deinit();
}
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