在線AES加密源碼

一本正經(jīng)地胡鬧 2019-09-04

展開全文

SecretKeySpec key = new SecretKeySpec(Arrays.copyOf(password.getBytes("utf-8"), 16), "AES");

Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

byte[] byteContent = content.getBytes("utf-8");

cipher.init(Cipher.ENCRYPT_MODE, key);

byte[] result = cipher.doFinal(byteContent);

return result;

用Base64處理字節(jié)數(shù)組,，得到加密字符串

CSDN很多加密代碼的key生成的很復雜,，而且和在線加密不一樣，主要區(qū)別在于：

1. SecretKeySpec key = new SecretKeySpec(encodeKey, "AES");

2. SecretKeySpec key = new SecretKeySpec(password.getBytes(), "AES");

加密網(wǎng)站用的是第2個,，直接用key字符串的字節(jié)數(shù)組（一般取前16個字節(jié),，可用Arrays.copyOf(bytes,16)）,。

第1個是先給key進行了一番加密操作,，再把它的字節(jié)數(shù)組給SecretKeySpec

KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128, new SecureRandom(password.getBytes()));
SecretKey secretKey = kgen.generateKey();
byte[] encodeKey = secretKey.getEncoded();
SecretKeySpec key = new SecretKeySpec(encodeKey, "AES");

Cipher cipher = Cipher.getInstance("AES");//默認ECB模式
byte[] byteContent = content.getBytes("utf-8");
cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
byte[] result = cipher.doFinal(byteContent);

public static String AESDncode(String encodeRules,String content){
try {
//1.構(gòu)造密鑰生成器，指定為AES算法,不區(qū)分大小寫
KeyGenerator keygen=KeyGenerator.getInstance("AES");
//2.根據(jù)ecnodeRules規(guī)則初始化密鑰生成器
//生成一個128位的隨機源,根據(jù)傳入的字節(jié)數(shù)組
keygen.init(128, new SecureRandom(encodeRules.getBytes()));
//3.產(chǎn)生原始對稱密鑰
SecretKey original_key=keygen.generateKey();
//4.獲得原始對稱密鑰的字節(jié)數(shù)組
byte [] raw=original_key.getEncoded();
//5.根據(jù)字節(jié)數(shù)組生成AES密鑰
SecretKey key=new SecretKeySpec(raw, "AES");
//6.根據(jù)指定算法AES自成密碼器
Cipher cipher=Cipher.getInstance("AES");
//7.初始化密碼器,，第一個參數(shù)為加密(Encrypt_mode)或者解密(Decrypt_mode)操作,，第二個參數(shù)為使用的KEY
cipher.init(Cipher.DECRYPT_MODE, key);
//8.將加密并編碼后的內(nèi)容解碼成字節(jié)數(shù)組
byte [] byte_content= new BASE64Decoder().decodeBuffer(content);
/*
* 解密
*/
byte [] byte_decode=cipher.doFinal(byte_content);
String AES_decode=new String(byte_decode,"utf-8");
return AES_decode;
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
}
//如果有錯就返加nulll
return null;
}