QT 如何进行 AES 和 DES

QT中可以使用QCA（Qt Cryptographic Architecture）库对字符串进行AES和DES加解密。以下是简单的示例代码：

AES加密：

#include <QtCrypto>

QCA::Initializer init;
QCA::SymmetricKey key = QCA::SymmetricKey("mysecretkey", 16);
QCA::Cipher cipher(QString("aes128"), QCA::Cipher::CBC, QCA::Cipher::DefaultPadding, QCA::Encode, key);
QCA::SecureArray plaintext("Hello World!");
QCA::SecureArray ciphertext = cipher.process(plaintext);
QString encrypted = QString::fromLatin1(ciphertext.toByteArray().toBase64());

AES解密：

#include <QtCrypto>

QCA::Initializer init;
QCA::SymmetricKey key = QCA::SymmetricKey("mysecretkey", 16);
QCA::Cipher cipher(QString("aes128"), QCA::Cipher::CBC, QCA::Cipher::DefaultPadding, QCA::Decode, key);
QByteArray base64 = QByteArray::fromBase64(QString("encrypted").toLatin1());
QCA::SecureArray ciphertext = QCA::SecureArray(base64);
QCA::SecureArray plaintext = cipher.process(ciphertext);
QString decrypted = QString::fromUtf8(plaintext.constData(), plaintext.size());

DES加密：

#include <QtCrypto>

QCA::Initializer init;
QCA::SymmetricKey key = QCA::SymmetricKey("mysecretkey", 8);
QCA::Cipher cipher(QString("des"), QCA::Cipher::CBC, QCA::Cipher::DefaultPadding, QCA::Encode, key);
QCA::SecureArray plaintext("Hello World!");
QCA::SecureArray ciphertext = cipher.process(plaintext);
QString encrypted = QString::fromLatin1(ciphertext.toByteArray().toBase64());

DES解密：

#include <QtCrypto>

QCA::Initializer init;
QCA::SymmetricKey key = QCA::SymmetricKey("mysecretkey", 8);
QCA::Cipher cipher(QString("des"), QCA::Cipher::CBC, QCA::Cipher::DefaultPadding, QCA::Decode, key);
QByteArray base64 = QByteArray::fromBase64(QString("encrypted").toLatin1());
QCA::SecureArray ciphertext = QCA::SecureArray(base64);
QCA::SecureArray plaintext = cipher.process(ciphertext);
QString decrypted = QString::fromUtf8(plaintext.constData(), plaintext.size());

需要注意的是，QCA库中的加密算法命名方式和标准有所不同，比如AES-128-CBC在QCA中被命名为aes128。在使用QCA库进行加密时，需要根据具体的加密算法指定正确的命名方式。