我正在尝试将我的应用程序从 128 位 AES key 升级到 256 位 AES key 。但是，当我将第 54 行从 128 更改为 256 时，出现以下 key 大小错误。
java.security.InvalidKeyException: 非法 key 大小
我已正确安装 JCE 文件，我的应用程序生成更长的 key 这一事实证明了这一点。
package com.company;
import com.hazelcast.util.Base64;
import javax.crypto.*;
import javax.crypto.spec.*;
class Encryption {
public static String encrypt (String strKey, String strIv, String str) {
String secret = "";
try{
byte[] key = Base64.decode(strKey.getBytes());
byte[] iv = Base64.decode(strIv.getBytes());
SecretKeySpec keyspec = new SecretKeySpec(key, "AES");
IvParameterSpec ivspec = new IvParameterSpec(iv);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
secret = new String(Base64.encode(cipher.doFinal(str.getBytes())));
}
catch(Exception e){
e.printStackTrace();
}
return secret;
}
public static String decrypt (String strKey, String strIv, String str) {
String secret = "";
try{
byte[] key = Base64.decode(strKey.getBytes());
byte[] iv = Base64.decode(strIv.getBytes());
SecretKeySpec keyspec = new SecretKeySpec(key, "AES");
IvParameterSpec ivspec = new IvParameterSpec(iv);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, keyspec,ivspec);
secret = new String(cipher.doFinal(new Base64().decode(str.getBytes())));
}
catch(Exception e){
e.printStackTrace();
}
return secret;
}
public static void main(String[] argv) {
String strIv = "18A5Z/IsHs6g8/65sBxkCQ==";
String strKey = "";
int keyStrength = 256;
try {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(keyStrength);
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
strKey = new String(new Base64().encode(raw));
System.out.println("Secret key is: " + strKey);
} catch (Exception ex) {
System.out.println(ex.toString());
}
String message = "My, it's a lovely day today!!!";
String encrypted = Encryption.encrypt(strKey, strIv, message);
System.out.println("Encrypted string is: " + encrypted);
System.out.println("Decrypted string is: " + Encryption.decrypt(strKey, strIv, encrypted));
}
}
我在其他帖子中看到过“AES/CBC/PKCS7Padding”加密方法，但这只是让我得到这个异常(exception):
java.security.NoSuchAlgorithmException: Cannot find any provider supporting AES/CBC/PKCS7Padding
at javax.crypto.Cipher.getInstance(Cipher.java:540)
at com.company.Encryption.encrypt(Encryption.java:17)
at com.company.Encryption.main(Encryption.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
java.security.NoSuchAlgorithmException: Cannot find any provider supporting AES/CBC/PKCS7Padding
at javax.crypto.Cipher.getInstance(Cipher.java:540)
at com.company.Encryption.decrypt(Encryption.java:39)
at com.company.Encryption.main(Encryption.java:69)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
最佳答案
找到了...
Oracle 在技术上在其下载页面上标记了 JCE 文件的版本，但对我来说并不明显。我正在使用 Java 8 JRE 安装 Java 6 文件。这就是为什么我能够生成 key 但不能加密/解密的原因。
我找到了正确的文件，安装了它们，现在可以正常工作了。
谢谢!
关于java - 使用 Java AES 256 key 加密/解密，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39669917/