我有以下代码可以生成 AES-128 一次性 key 。之后,我使用从证书读取的 RSA 公钥加密该一次性 key 。加密后的字节始终为0。为什么?
// Generate a one-time key
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(128);
SecretKey oneTimeKey = keyGenerator.generateKey();
System.out.println("Encrypted bytes length: " + oneTimeKey.getEncoded().length); // prints "Plain bytes length: 16"
// Retrieve public key from certificate
FileInputStream fileInputStream = new FileInputStream("D:\\test.cer");
CertificateFactory factory = CertificateFactory.getInstance("X.509");
X509Certificate certificate = (X509Certificate) factory.generateCertificate(fileInputStream);
PublicKey publicKey = certificate.getPublicKey();
// Encrypt one-time key using the public key.
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
CipherOutputStream cipherOutputStream = new CipherOutputStream(byteArrayOutputStream, cipher);
cipherOutputStream.write(oneTimeKey.getEncoded(), 0, oneTimeKey.getEncoded().length);
// Retrieve the encrypted bytes.
System.out.println("Encrypted bytes length: " + byteArrayOutputStream.toByteArray().length); // prints "Encrypted bytes length: 0"
cipherOutputStream.close();
最佳答案
在获取字节数组之前尝试刷新密码输出流。
关于java - 这个加密代码有什么问题吗?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28450929/