Mega Code Archive
SHA1 Sum
<![CDATA[
/**
* This file is distributed under the GPL
* $Id: SHA1Sum.java 1810 2009-06-22 17:33:07Z scotta $
*/
//package net.bnubot.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.security.MessageDigest;
//import net.bnubot.logging.Out;
/**
* @author scotta
*/
public class SHA1Sum {
private final byte[] sha1sum;
private String display = null;
public SHA1Sum(String hexStr) throws Exception {
if(!hexStr.matches("[0-9a-fA-F]{40}"))
throw new Exception("Invalid format: " + hexStr);
display = hexStr.toLowerCase();
sha1sum = new byte[20];
for(int i = 0; i < 20; i++) {
int pos = i << 1;
sha1sum[i] = (byte) Integer.parseInt(hexStr.substring(pos, pos+2), 16);
}
}
public SHA1Sum(byte[] bytes) throws Exception {
MessageDigest digest = MessageDigest.getInstance("SHA1");
digest.update(bytes, 0, bytes.length);
sha1sum = digest.digest();
}
public SHA1Sum(File f) throws Exception {
MessageDigest digest = MessageDigest.getInstance("SHA1");
InputStream is = new FileInputStream(f);
byte[] buffer = new byte[8192];
do {
int read = is.read(buffer);
if(read <= 0)
break;
digest.update(buffer, 0, read);
} while(true);
sha1sum = digest.digest();
}
private static String hexChr(int b) {
return Integer.toHexString(b & 0xF);
}
private static String toHex(int b) {
return hexChr((b & 0xF0) >> 4) + hexChr(b & 0x0F);
}
@Override
public String toString() {
if(display == null) {
display = "";
for(byte b : sha1sum)
display += toHex(b);
}
return display;
}
public byte[] getSum() {
return sha1sum;
}
@Override
public boolean equals(Object obj) {
if(!(obj instanceof SHA1Sum))
return false;
byte[] obj_sha1sum = ((SHA1Sum)obj).sha1sum;
if(sha1sum.length != obj_sha1sum.length)
return false;
for(int i = 0; i < sha1sum.length; i++)
if(sha1sum[i] != obj_sha1sum[i])
return false;
return true;
}
}
]]>