+++ /dev/null
-/*
- Copyright (C) 2018 Carl Hetherington <cth@carlh.net>
-
- This file is part of DCP-o-matic.
-
- DCP-o-matic is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- DCP-o-matic 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 General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
-
-*/
-
-/* Based on code from https://wiki.openssl.org/index.php/EVP_Symmetric_Encryption_and_Decryption */
-
-#include "crypto.h"
-#include "exceptions.h"
-#include <openssl/conf.h>
-#include <openssl/evp.h>
-#include <openssl/err.h>
-#include <openssl/rand.h>
-#include <boost/scoped_array.hpp>
-
-using std::string;
-using boost::shared_array;
-using namespace dcpomatic;
-
-/** The cipher that this code uses */
-#define CIPHER EVP_aes_256_cbc()
-
-dcp::Data
-dcpomatic::random_iv ()
-{
- EVP_CIPHER const * cipher = CIPHER;
- dcp::Data iv (EVP_CIPHER_iv_length(cipher));
- RAND_bytes (iv.data().get(), iv.size());
- return iv;
-}
-
-dcp::Data
-dcpomatic::encrypt (string plaintext, dcp::Data key, dcp::Data iv)
-{
- EVP_CIPHER_CTX* ctx = EVP_CIPHER_CTX_new ();
- if (!ctx) {
- throw CryptoError ("could not create cipher context");
- }
-
- int r = EVP_EncryptInit_ex (ctx, CIPHER, 0, key.data().get(), iv.data().get());
- if (r != 1) {
- throw CryptoError ("could not initialise cipher context for encryption");
- }
-
- dcp::Data ciphertext (plaintext.size() * 2);
-
- int len;
- r = EVP_EncryptUpdate (ctx, ciphertext.data().get(), &len, (uint8_t const *) plaintext.c_str(), plaintext.size());
- if (r != 1) {
- throw CryptoError ("could not encrypt data");
- }
-
- int ciphertext_len = len;
-
- r = EVP_EncryptFinal_ex (ctx, ciphertext.data().get() + len, &len);
- if (r != 1) {
- throw CryptoError ("could not finish encryption");
- }
-
- ciphertext.set_size (ciphertext_len + len);
-
- EVP_CIPHER_CTX_free (ctx);
-
- return ciphertext;
-}
-
-string
-dcpomatic::decrypt (dcp::Data ciphertext, dcp::Data key, dcp::Data iv)
-{
- EVP_CIPHER_CTX* ctx = EVP_CIPHER_CTX_new ();
- if (!ctx) {
- throw CryptoError ("could not create cipher context");
- }
-
- int r = EVP_DecryptInit_ex (ctx, CIPHER, 0, key.data().get(), iv.data().get());
- if (r != 1) {
- throw CryptoError ("could not initialise cipher context for decryption");
- }
-
- dcp::Data plaintext (ciphertext.size() * 2);
-
- int len;
- r = EVP_DecryptUpdate (ctx, plaintext.data().get(), &len, ciphertext.data().get(), ciphertext.size());
- if (r != 1) {
- throw CryptoError ("could not decrypt data");
- }
-
- int plaintext_len = len;
-
- r = EVP_DecryptFinal_ex (ctx, plaintext.data().get() + len, &len);
- if (r != 1) {
- throw CryptoError ("could not finish decryption");
- }
-
- plaintext_len += len;
- plaintext.set_size (plaintext_len + 1);
- plaintext.data().get()[plaintext_len] = '\0';
-
- EVP_CIPHER_CTX_free (ctx);
-
- return string ((char *) plaintext.data().get());
-}
-
-int
-dcpomatic::crypto_key_length ()
-{
- return EVP_CIPHER_key_length (CIPHER);
-}