Mega Code Archive
SHA1 Utils
<![CDATA[
/*
Copyright 2010 Cesar Valiente Gordo
This file is part of QuiteSleep.
QuiteSleep 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.
QuiteSleep 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 QuiteSleep. If not, see <http://www.gnu.org/licenses/>.
*/
package es.cesar.quitesleep.utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.security.MessageDigest;
import java.util.Arrays;
import android.util.Log;
/**
*
* @author Cesar Valiente Gordo
* @mail cesar.valiente@gmail.com
*
*/
public class SHA1Utils {
final static String CLASS_NAME = "SHA1Util";
// Genera SHA-1 de un char[]
public static byte[] generateSHA1 (char chars[]) {
return generateSHA1(new String(chars));
}
// Genera SHA-1 de un String
public static byte[] generateSHA1 (String str) {
return generateSHA1(str.getBytes());
}
// Genera SHA-1 de un InputStream
public static byte[] generateSHA1 (InputStream is) {
try {
return generateSHA1(InputStreamUtils.InputStreamTOByte(is));
} catch (Exception e) {
return null;
}
}
/**
* This function converts a string without conding into a String encoded
* into a SHA1
*
* @param str
* @return
*/
public static String generateSHA1toString (String str) {
try
{
byte[] datos = generateSHA1(str.getBytes());
return byteArrayToHexString(datos);
}catch (Exception e) {
if (QSLog.DEBUG_E)QSLog.e(CLASS_NAME,
ExceptionUtils.exceptionTraceToString(
e.toString(),
e.getStackTrace()));
return null;
}
}
/**
* This function converts an InputStream into a SHA1 String
*
* @param is
* @return
*/
public static String generateSHA1toString (InputStream is) {
try {
return InputStreamUtils.byteToString(generateSHA1(InputStreamUtils.InputStreamTOByte(is)));
} catch (Exception e) {
return null;
}
}
/**
* This function generates a SHA1 byte[] from a file
* @param file
* @return
*/
public static byte[] generateSHA1 (File file) {
try {
return generateSHA1(new FileInputStream (file));
} catch (Exception e) {
return null;
}
}
/**
* This function generates a SHA1 byte[] from another byte[].
* @param bytes
* @return
*/
public static byte[] generateSHA1 (byte[] bytes) {
byte[] encryted = null;
try {
MessageDigest digest = MessageDigest.getInstance("SHA-1");
digest.reset();
digest.update(bytes);
encryted = digest.digest();
} catch (Exception e) {
if (QSLog.DEBUG_E)QSLog.e(CLASS_NAME, ExceptionUtils.exceptionTraceToString(
e.toString(),
e.getStackTrace()));
}
return encryted;
}
/**
* This function encodes byte[] into a hex
*
* @param b
* @return
*/
public static String byteArrayToHexString(byte[] b){
if (b==null) return null;
StringBuffer sb = new StringBuffer(b.length * 2);
for (int i = 0; i < b.length; i++){
int v = b[i] & 0xff;
if (v < 16) {
sb.append('0');
}
sb.append(Integer.toHexString(v));
}
return sb.toString().toUpperCase();
}
/**
* This function encodes a Hex String into a byte[]
* @param s
* @return
*/
public static byte[] hexStringToByteArray(String s) {
if (s==null) return null;
byte[] b = new byte[s.length() / 2];
for (int i = 0; i < b.length; i++){
int index = i * 2;
int v = Integer.parseInt(s.substring(index, index + 2), 16);
b[i] = (byte)v;
}
return b;
}
/**
* This function compares two bytes[]
* @param b1
* @param b2
* @return
*/
public static boolean compareByteArrays (byte[] b1, byte[] b2) {
return b1!=null && b2!=null && Arrays.equals(b1, b2) ;
}
/**
* This function compares two Strings.
* @param s1
* @param s2
* @return
*/
public static boolean compareHexString (String s1, String s2) {
return s1!=null && s2!=null && s1.equalsIgnoreCase(s2);
}
}
]]>