java des加密能不能指定key,而不是生成
我想在本地把数据加密，然后上传到服务器解密，想使用des算法，但是java中能不能指定固定key，而不是生成key吗？
加密
java
服务器
算法
数据
--------------------编程问答--------------------
当然可以指定key，Base64，我用的都是自己指定key啊
--------------------编程问答--------------------
可以指定key，来个实例：
public class DesUtils {
private static String strDefaultKey = "national";
private Cipher encryptCipher = null;
private Cipher decryptCipher = null;
public static String byteArr2HexStr(byte[] arrB) {
int iLen = arrB.length;
StringBuffer sb = new StringBuffer(iLen * 2);
for (int i = 0; i < iLen; i++) {
int intTmp = arrB[i];
while (intTmp < 0) {
intTmp = intTmp + 256;
}
if (intTmp < 16) {
sb.append("0");
}
sb.append(Integer.toString(intTmp, 16));
}
return sb.toString();
}
public static byte[] hexStr2ByteArr(String strIn) {
byte[] arrB = strIn.getBytes();
int iLen = arrB.length;
byte[] arrOut = new byte[iLen / 2];
for (int i = 0; i < iLen; i = i + 2) {
String strTmp = new String(arrB, i, 2);
arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
}
return arrOut;
}
public DesUtils() throws InvalidKeyException, NoSuchAlgorithmException,
NoSuchPaddingException {
this(strDefaultKey);
}
public DesUtils(String strKey) throws NoSuchAlgorithmException,
NoSuchPaddingException, InvalidKeyException {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
Key key = getKey(strKey.getBytes());
encryptCipher = Cipher.getInstance("DES");
encryptCipher.init(Cipher.ENCRYPT_MODE, key);
decryptCipher = Cipher.getInstance("DES");
decryptCipher.init(Cipher.DECRYPT_MODE, key);
}
public byte[] encrypt(byte[] arrB) throws IllegalBlockSizeException,
BadPaddingException {
return encryptCipher.doFinal(arrB);
}
public String encrypt(String strIn) throws IllegalBlockSizeException,
BadPaddingException {
return byteArr2HexStr(encrypt(strIn.getBytes()));
}
public byte[] decrypt(byte[] arrB) throws IllegalBlockSizeException,
BadPaddingException {
return decryptCipher.doFinal(arrB);
}
public String decrypt(String strIn) throws IllegalBlockSizeException,
BadPaddingException {
return new String(decrypt(hexStr2ByteArr(strIn)));
}
private Key getKey(byte[] arrBTmp) {
byte[] arrB = new byte[8];
for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
arrB[i] = arrBTmp[i];
}
Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");
return key;
}
}
补充：Java , Java EE
