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encrypt.java
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/**
########################################################################
# Copyright (C) 2013 Panagiotis Kritikakos <panoskrt@gmail.com> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <http://www.gnu.org/licenses/>. #
########################################################################
**/
package com.panoskrt.javaencrypt;
import java.io.FileInputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class Encrypt {
private FileInputStream fis;
public Encrypt() {
// Constructor
}
public String encryptString(String input, String salt, String algorithm) {
String output = null;
String fullInput = null;
if (!salt.equals(null)) {
fullInput = salt + input;
} else {
fullInput = input;
}
try {
MessageDigest digest = MessageDigest.getInstance(algorithm);
digest.update(fullInput.getBytes(), 0, fullInput.length());
output = new BigInteger(1, digest.digest()).toString(16);
} catch (NoSuchAlgorithmException ex) {
ex.printStackTrace();
}
return output;
}
// Based on: http://www.mkyong.com/java/how-to-generate-a-file-checksum-value-in-java/
public String calculateFingerprint(String fileName, String algorithm) {
StringBuffer sb = new StringBuffer();
try {
MessageDigest md = MessageDigest.getInstance(algorithm);
fis = new FileInputStream(fileName);
byte[] dataBytes = new byte[1024];
int nread = 0;
while ((nread = fis.read(dataBytes)) != -1) {
md.update(dataBytes, 0, nread);
}
byte[] mdbytes = md.digest();
for (int i = 0; i < mdbytes.length; i++) {
sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
}
} catch (Exception ex) {
ex.printStackTrace();
}
return sb.toString();
}
}