JDK对DESede算法的支持
密钥长度：128位
工作模式：ECB/CBC/PCBC/CTR/CTS/CFB/CFB8 to CFB128/OFB/OBF8 to OFB128
填充方式：Nopadding/PKCS5Padding/ISO10126Padding/
AES加密解密的java实现：
package com.kongxincai.encanddecimport java.security.Keyimport java.security.NoSuchAlgorithmExceptionimport javax.crypto.Cipherimport javax.crypto.KeyGeneratorimport javax.crypto.SecretKeyimport javax.crypto.spec.SecretKeySpecpublic class AESCoder { private static final String KEY_ALGORITHM = "AES" private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding"//默认的加密算法
public static byte[] initSecretKey() { //返回生成指定算法密钥生成器的 KeyGenerator 对象
KeyGenerator kg = null try {
kg = KeyGenerator.getInstance(KEY_ALGORITHM)
} catch (NoSuchAlgorithmException e) {
e.printStackTrace() return new byte[0]
} //初始化此密钥生成器，使其具有确定的密钥大小 //AES 要求密钥长度为 128
kg.init(128) //生成一个密钥
SecretKey secretKey = kg.generateKey() return secretKey.getEncoded()
} private static Key toKey(byte[] key){ //生成密钥
return new SecretKeySpec(key, KEY_ALGORITHM)
} public static byte[] encrypt(byte[] data,Key key) throws Exception{ return encrypt(data, key,DEFAULT_CIPHER_ALGORITHM)
} public static byte[] encrypt(byte[] data,byte[] key) throws Exception{ return encrypt(data, key,DEFAULT_CIPHER_ALGORITHM)
} public static byte[] encrypt(byte[] data,byte[] key,String cipherAlgorithm) throws Exception{ //还原密钥
Key k = toKey(key) return encrypt(data, k, cipherAlgorithm)
} public static byte[] encrypt(byte[] data,Key key,String cipherAlgorithm) throws Exception{ //实例化
Cipher cipher = Cipher.getInstance(cipherAlgorithm) //使用密钥初始化，设置为加密模式 cipher.init(Cipher.ENCRYPT_MODE, key) //执行操作
return cipher.doFinal(data)
} public static byte[] decrypt(byte[] data,byte[] key) throws Exception{ return decrypt(data, key,DEFAULT_CIPHER_ALGORITHM)
} public static byte[] decrypt(byte[] data,Key key) throws Exception{ return decrypt(data, key,DEFAULT_CIPHER_ALGORITHM)
} public static byte[] decrypt(byte[] data,byte[] key,String cipherAlgorithm) throws Exception{ //还原密钥
Key k = toKey(key) return decrypt(data, k, cipherAlgorithm)
} public static byte[] decrypt(byte[] data,Key key,String cipherAlgorithm) throws Exception{ //实例化
Cipher cipher = Cipher.getInstance(cipherAlgorithm) //使用密钥初始化，设置为解密模式 cipher.init(Cipher.DECRYPT_MODE, key) //执行操作
return cipher.doFinal(data)
} private static String showByteArray(byte[] data){ if(null == data){ return null
}
StringBuilder sb = new StringBuilder("{") for(byte b:data){
sb.append(b).append(",")
}
sb.deleteCharAt(sb.length()-1)
sb.append("}") return sb.toString()
} public static void main(String[] args) throws Exception { byte[] key = initSecretKey()
System.out.println("key："+showByteArray(key))
Key k = toKey(key)//生成秘钥
String data ="AES数据"
System.out.println("加密前数据: string:"+data)
System.out.println("加密前数据: byte[]:"+showByteArray(data.getBytes()))
System.out.println() byte[] encryptData = encrypt(data.getBytes(), k)//数据加密
System.out.println("加密后数据: byte[]:"+showByteArray(encryptData))// System.out.println("加密后数据: hexStr:"+Hex.encodeHexStr(encryptData)) System.out.println() byte[] decryptData = decrypt(encryptData, k)//数据解密
System.out.println("解密后数据: byte[]:"+showByteArray(decryptData))
System.out.println("解密后数据: string:"+new String(decryptData))
}
}
你解密的key必须是加密的key啊你看看，你解密的时候又KeyGenerator.getInstance("AES").generateKey()这是重新搞了一个key啊，当然解不出来了
我估计你这代码人家原先是写在一起的吧，加密完了再直接解密给你看，人家只generateKey一次，自然很顺利，你分成了两个例子，居然分别generateKey，自然失败
具体是报什么错误呢？一般解密报错的情况有，输入不满足16的倍数个字节，这种情况会报，AES解密异常Given final block not properly padded，具体参考：http://www.it399.com/blog/web/201805211406 可以使用这个在线工具解密，如果报错会有相应的错误提示，希望能够帮助到你。
