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// SPDX-FileCopyrightText: 2021 Linus Jahn <lnj@kaidan.im>
// SPDX-FileCopyrightText: 2022 Melvin Keskin <melvo@olomono.de>
//
// SPDX-License-Identifier: LGPL-2.1-or-later
#include "OmemoCryptoProvider.h"
#include "QXmppOmemoManager_p.h"
#include "QXmppUtils_p.h"
#include <QStringBuilder>
#include <QtCrypto>
using namespace QXmpp::Private;
inline QXmppOmemoManagerPrivate *managerPrivate(void *ptr)
{
return reinterpret_cast<QXmppOmemoManagerPrivate *>(ptr);
}
static int random_func(uint8_t *data, size_t len, void *)
{
generateRandomBytes(data, len);
return 0;
}
int hmac_sha256_init_func(void **hmac_context, const uint8_t *key, size_t key_len, void *user_data)
{
auto *d = managerPrivate(user_data);
if (!QCA::MessageAuthenticationCode::supportedTypes().contains(PAYLOAD_MESSAGE_AUTHENTICATION_CODE_TYPE)) {
d->warning("Message authentication code type '" % QString(PAYLOAD_MESSAGE_AUTHENTICATION_CODE_TYPE) % "' is not supported by this system");
return -1;
}
QCA::SymmetricKey authenticationKey(QByteArray(reinterpret_cast<const char *>(key), key_len));
*hmac_context = new QCA::MessageAuthenticationCode(PAYLOAD_MESSAGE_AUTHENTICATION_CODE_TYPE, authenticationKey);
return 0;
}
int hmac_sha256_update_func(void *hmac_context, const uint8_t *data, size_t data_len, void *)
{
auto *messageAuthenticationCodeGenerator = reinterpret_cast<QCA::MessageAuthenticationCode *>(hmac_context);
messageAuthenticationCodeGenerator->update(QCA::MemoryRegion(QByteArray(reinterpret_cast<const char *>(data), data_len)));
return 0;
}
int hmac_sha256_final_func(void *hmac_context, signal_buffer **output, void *user_data)
{
auto *d = managerPrivate(user_data);
auto *messageAuthenticationCodeGenerator = reinterpret_cast<QCA::MessageAuthenticationCode *>(hmac_context);
auto messageAuthenticationCode = messageAuthenticationCodeGenerator->final();
if (!(*output = signal_buffer_create(reinterpret_cast<const uint8_t *>(messageAuthenticationCode.constData()), messageAuthenticationCode.size()))) {
d->warning("Message authentication code could not be loaded");
return -1;
}
return 0;
}
void hmac_sha256_cleanup_func(void *hmac_context, void *)
{
auto *messageAuthenticationCodeGenerator = reinterpret_cast<QCA::MessageAuthenticationCode *>(hmac_context);
delete messageAuthenticationCodeGenerator;
}
int sha512_digest_init_func(void **digest_context, void *)
{
*digest_context = new QCryptographicHash(QCryptographicHash::Sha512);
return 0;
}
int sha512_digest_update_func(void *digest_context, const uint8_t *data, size_t data_len, void *)
{
auto *hashGenerator = reinterpret_cast<QCryptographicHash *>(digest_context);
hashGenerator->addData(reinterpret_cast<const char *>(data), data_len);
return 0;
}
int sha512_digest_final_func(void *digest_context, signal_buffer **output, void *user_data)
{
auto *d = managerPrivate(user_data);
auto *hashGenerator = reinterpret_cast<QCryptographicHash *>(digest_context);
auto hash = hashGenerator->result();
if (!(*output = signal_buffer_create(reinterpret_cast<const uint8_t *>(hash.constData()), hash.size()))) {
d->warning("Hash could not be loaded");
return -1;
}
return 0;
}
void sha512_digest_cleanup_func(void *digest_context, void *)
{
auto *hashGenerator = reinterpret_cast<QCryptographicHash *>(digest_context);
delete hashGenerator;
}
int encrypt_func(signal_buffer **output,
int cipher,
const uint8_t *key, size_t key_len,
const uint8_t *iv, size_t iv_len,
const uint8_t *plaintext, size_t plaintext_len,
void *user_data)
{
auto *d = managerPrivate(user_data);
QString cipherName;
switch (key_len) {
case 128 / 8:
cipherName = QStringLiteral("aes128");
break;
case 192 / 8:
cipherName = QStringLiteral("aes192");
break;
case 256 / 8:
cipherName = QStringLiteral("aes256");
break;
default:
return -1;
}
QCA::Cipher::Mode mode;
QCA::Cipher::Padding padding;
switch (cipher) {
case SG_CIPHER_AES_CTR_NOPADDING:
mode = QCA::Cipher::CTR;
padding = QCA::Cipher::NoPadding;
break;
case SG_CIPHER_AES_CBC_PKCS5:
mode = QCA::Cipher::CBC;
padding = QCA::Cipher::PKCS7;
break;
default:
return -2;
}
const auto encryptionKey = QCA::SymmetricKey(QByteArray(reinterpret_cast<const char *>(key), key_len));
const auto initializationVector = QCA::InitializationVector(QByteArray(reinterpret_cast<const char *>(iv), iv_len));
QCA::Cipher encryptionCipher(cipherName, mode, padding, QCA::Encode, encryptionKey, initializationVector);
auto encryptedData = encryptionCipher.process(QCA::MemoryRegion(QByteArray(reinterpret_cast<const char *>(plaintext), plaintext_len)));
if (encryptedData.isEmpty()) {
return -3;
}
if (!(*output = signal_buffer_create(reinterpret_cast<const uint8_t *>(encryptedData.constData()), encryptedData.size()))) {
d->warning("Encrypted data could not be loaded");
return -4;
}
return 0;
}
int decrypt_func(signal_buffer **output,
int cipher,
const uint8_t *key, size_t key_len,
const uint8_t *iv, size_t iv_len,
const uint8_t *ciphertext, size_t ciphertext_len,
void *user_data)
{
auto *d = managerPrivate(user_data);
QString cipherName;
switch (key_len) {
case 128 / 8:
cipherName = QStringLiteral("aes128");
break;
case 192 / 8:
cipherName = QStringLiteral("aes192");
break;
case 256 / 8:
cipherName = QStringLiteral("aes256");
break;
default:
return -1;
}
QCA::Cipher::Mode mode;
QCA::Cipher::Padding padding;
switch (cipher) {
case SG_CIPHER_AES_CTR_NOPADDING:
mode = QCA::Cipher::CTR;
padding = QCA::Cipher::NoPadding;
break;
case SG_CIPHER_AES_CBC_PKCS5:
mode = QCA::Cipher::CBC;
padding = QCA::Cipher::PKCS7;
break;
default:
return -2;
}
const auto encryptionKey = QCA::SymmetricKey(QByteArray(reinterpret_cast<const char *>(key), key_len));
const auto initializationVector = QCA::InitializationVector(QByteArray(reinterpret_cast<const char *>(iv), iv_len));
QCA::Cipher decryptionCipher(cipherName, mode, padding, QCA::Decode, encryptionKey, initializationVector);
auto decryptedData = decryptionCipher.process(QCA::MemoryRegion(QByteArray(reinterpret_cast<const char *>(ciphertext), ciphertext_len)));
if (decryptedData.isEmpty()) {
return -3;
}
if (!(*output = signal_buffer_create(reinterpret_cast<const uint8_t *>(decryptedData.constData()), decryptedData.size()))) {
d->warning("Decrypted data could not be loaded");
return -4;
}
return 0;
}
namespace QXmpp::Omemo::Private {
signal_crypto_provider createOmemoCryptoProvider(QXmppOmemoManagerPrivate *d)
{
return {
random_func,
hmac_sha256_init_func,
hmac_sha256_update_func,
hmac_sha256_final_func,
hmac_sha256_cleanup_func,
sha512_digest_init_func,
sha512_digest_update_func,
sha512_digest_final_func,
sha512_digest_cleanup_func,
encrypt_func,
decrypt_func,
d,
};
}
} // namespace QXmpp::Omemo::Private
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