public byte[] encrypt(byte[] data, String key) throws Exception {
try{
SecureRandom random = new SecureRandom();
DESKeySpec desKey = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
SecretKey securekey = keyFactory.generateSecret(desKey);
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
return cipher.doFinal(data);
}catch(Throwable e){
e.printStackTrace();
}
return null;
}
Cipher
是真正加密的.
key
的长度应该是8,太长会截断,不够长会抛异常。
public byte[] decrypt(byte[] data, String key) throws Exception {
SecureRandom random = new SecureRandom();
DESKeySpec desKey = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
SecretKey securekey = keyFactory.generateSecret(desKey);
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, securekey, random);
return cipher.doFinal(data);
}
加密后的数据(byte[])可以转化为 Hex String 储存
public String bytesToHexString(byte[] data){
return HexBin.encode(data);
}
当然,解密之前先吧Hex String 转化为byte[]。
public byte[] hexStringToBytes(String hexString){
byte[] bytes = new byte[hexString.length() / 2];
for (int i = 0; i < bytes.length; i++) {
bytes[i] = (byte) Integer.parseInt(hexString.substring(2 * i, 2 * i + 2), 16);
}
return bytes;
}