尝试加密字符串时为什么会出现BadPaddingException？
我通过此链接创建了一个Encryption类来Encryption /解密我的Android项目中的二进制数据。
package com.my.package; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; // TODO Incomplete class public class Encryption { private static final byte[] salt = { (byte) 0xA4, (byte) 0x0B, (byte) 0xC8, (byte) 0x34, (byte) 0xD6, (byte) 0x95, (byte) 0xF3, (byte) 0x13 }; private static int BLOCKS = 128; private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte[] encrypted = cipher.doFinal(clear); return encrypted; } private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] decrypted = cipher.doFinal(encrypted); return decrypted; } private static byte[] getKey() throws Exception { byte[] keyStart = "this is a key".getBytes(); KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); sr.setSeed(keyStart); kgen.init(128, sr); // 192 and 256 bits may not be available SecretKey skey = kgen.generateKey(); byte[] key = skey.getEncoded(); return key; } public static void test() { String test = "My Name Is Dragon Warrior"; byte[] e = null; try { e = encrypt(getKey(), test.getBytes()); } catch (Exception e1) { // TODO Auto-generated catch block e1.printStackTrace(); } byte[] d = null; try { d = decrypt(getKey(), e); } catch (Exception e1) { // TODO Auto-generated catch block e1.printStackTrace(); } System.out.println(new String(d)); } }
然后我在主要活动中运行代码：
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // ... Encryption.test(); // ... }
然后，当在test()执行以下代码时，我得到BadPaddingException ：
try { d = decrypt(getKey(), e); } catch (Exception e1) { // TODO Auto-generated catch block e1.printStackTrace(); }
有趣的是，我创建了一个除Android项目之外的Java项目。 并且代码运行正常，没有任何exception。
我的代码出了什么问题？
“SHA1PRNG” 不是密钥派生函数，并且实现可能因提供者而异。 请使用正确的KDF（如PBKDF2）作为密码。 “这是关键” 不是关键，它是一个字符串。