Mega Code Archive
Sha1 hashes based on a given String
<![CDATA[
//package gr.aueb.cs.mscis.chordroid.util;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* This class produces Sha1 hashes based on a given String
* @author lupin
*
*/
class Sha1 {
public static String getHash(String str) {
MessageDigest digest = null;
byte[] input = null;
try {
digest = MessageDigest.getInstance("SHA-1");
digest.reset();
input = digest.digest(str.getBytes("UTF-8"));
} catch (NoSuchAlgorithmException e1) {
e1.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return convertToHex(input);
}
public static String getHash(byte[] data) {
MessageDigest digest = null;
byte[] input = null;
try {
digest = MessageDigest.getInstance("SHA-1");
digest.reset();
input = digest.digest(data);
} catch (NoSuchAlgorithmException e1) {
e1.printStackTrace();
}
return convertToHex(input);
}
private static String convertToHex(byte[] data) {
StringBuffer buf = new StringBuffer();
for (int i = 0; i < data.length; i++) {
int halfbyte = (data[i] >>> 4) & 0x0F;
int two_halfs = 0;
do {
if ((0 <= halfbyte) && (halfbyte <= 9))
buf.append((char) ('0' + halfbyte));
else
buf.append((char) ('a' + (halfbyte - 10)));
halfbyte = data[i] & 0x0F;
} while(two_halfs++ < 1);
}
return buf.toString();
}
}
]]>