当我尝试解密已加密的消息时出现此错误。
为此,我首先加密了一条消息,在本例中为“测试消息”
然后再次运行该方法,但解密而不是加密。
我已经查看了与此相关的其他问题,但无法解决问题
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
public class PBEusing {
public static void main(String[] args) throws Exception {
PBEusing pbe = new PBEusing();
String encrypt = pbe.pbe("encrypt", "passwordTest", "Testing message");
System.out.println(encrypt);
String decrypt = pbe.pbe("decrypt", "passwordTest", encrypt);
System.out.println(decrypt);
}
public static String pbe(String cipherMethod, String clientPassword, String clientMessage) throws Exception {
String method = cipherMethod.toUpperCase();
String output = "";
SecureRandom rnd = new SecureRandom();
byte[] iv = new byte[16];
rnd.nextBytes(iv);
byte[] plaintext = clientMessage.getBytes(StandardCharsets.UTF_8); // input message from user
byte[] salt = "01234567".getBytes(StandardCharsets.UTF_8);
IvParameterSpec ivParamSpec = new IvParameterSpec(iv);
PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, 10000, ivParamSpec);
PBEKeySpec keySpec = new PBEKeySpec(clientPassword.toCharArray());
try {
SecretKeyFactory kf = SecretKeyFactory.getInstance("PBEWithHmacSHA256AndAES_128");
SecretKey secretKey = kf.generateSecret(keySpec);
// On J2SE the SecretKeyfactory does not actually generate a key, it just wraps the password.
// The real encryption key is generated later on-the-fly when initializing the cipher
System.out.println(new String(secretKey.getEncoded()));
// Encrypt
if (method.equals("ENCRYPT")) {
Cipher enc = Cipher.getInstance("PBEWithHmacSHA256AndAES_128");
enc.init(Cipher.ENCRYPT_MODE, secretKey, pbeParamSpec);
byte[] encrypted = enc.doFinal(plaintext);
output = new BASE64Encoder().encode(encrypted);
System.out.println("Encrypted text: " + output);
} else {
// Decrypt
Cipher dec = Cipher.getInstance("PBEWithHmacSHA256AndAES_128");
dec.init(Cipher.DECRYPT_MODE, secretKey, pbeParamSpec);
byte[] decrypted = dec.doFinal(plaintext);
String test = new BASE64Encoder().encode(decrypted);
//String message = new String(test, StandardCharsets.UTF_8);
output = test;
}
} catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
}
return output;
}
}
答案 0 :(得分:0)
您正在对加密输出进行Base64编码,但是在尝试解密之前不会再次对Base64进行解码。