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
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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;
}
}