无法加密特殊字符:不是块长度的倍数 [英] Unable to encrypt special characters: not multiple of block length
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问题描述
我有一个加密/解密算法,我正在尝试对一些特殊字符进行加密,以便从android发送到服务器,但这会引发异常:
I have an encryption/decryption algorithm and I'm trying to encrypt some special characters to send to the server from android, but it is throwing an exception:
java.lang.Exception:[加密]错误:0607F08A:数字信封例程:EVP_EncryptFinal_ex:数据不是块长度的倍数
java.lang.Exception: [encrypt] error:0607F08A:digital envelope routines:EVP_EncryptFinal_ex:data not multiple of block length
正常的拉丁字符可以加密/解密,但特殊字符则不能.
Normal Latin characters are encrypted/decrypted fine, but special characters aren't.
这是我的代码:
public class MCrypt {
private String iv = "fedcba9876543210";//Dummy iv (CHANGE IT!)
private IvParameterSpec ivspec;
private SecretKeySpec keyspec;
private Cipher cipher;
private String SecretKey = "0123456789abcdef";//Dummy secretKey (CHANGE IT!)
public MCrypt()
{
ivspec = new IvParameterSpec(iv.getBytes());
keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");
try {
cipher = Cipher.getInstance("AES/CBC/NoPadding");
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public byte[] encrypt(String text) throws Exception
{
//if(text == null || text.length() == 0)
// throw new Exception("Empty string");
byte[] encrypted = null;
try {
cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
encrypted = cipher.doFinal(padString(text).getBytes());
} catch (Exception e)
{
throw new Exception("[encrypt] " + e.getMessage());
}
return encrypted;
}
public byte[] decrypt(String code) throws Exception
{
if(code == null || code.length() == 0)
throw new Exception("Empty string");
byte[] decrypted = null;
try {
cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
decrypted = cipher.doFinal(hexToBytes(code));
} catch (Exception e)
{
throw new Exception("[decrypt] " + e.getMessage());
}
return decrypted;
}
public static String bytesToHex(byte[] data)
{
if (data==null)
{
return null;
}
int len = data.length;
String str = "";
for (int i=0; i<len; i++) {
if ((data[i]&0xFF)<16)
str = str + "0" + Integer.toHexString(data[i]&0xFF);
else
str = str + Integer.toHexString(data[i]&0xFF);
}
return str;
}
public static byte[] hexToBytes(String str) {
if (str==null) {
return null;
} else if (str.length() < 2) {
return null;
} else {
int len = str.length() / 2;
byte[] buffer = new byte[len];
for (int i=0; i<len; i++) {
buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
}
return buffer;
}
}
private static String padString(String source)
{
char paddingChar = ' ';
int size = 32;
int x = source.length() % size;
int padLength = size - x;
for (int i = 0; i < padLength; i++)
{
source += paddingChar;
}
return source;
}
}
有人知道这是什么问题吗?
Does anyone know what the problem here is?
谢谢!
推荐答案
更改此行:
cipher = Cipher.getInstance("AES/CBC/NoPadding");
收件人
cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
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