Compute SHA-1 of byte array

java sha1
Mike picture Mike · Oct 4, 2009 · Viewed 56k times · Source

I'm looking for a way of getting an SHA-1 checksum with a Java byte array as the message.

Should I use a third party tool or is there something built in to the JVM that can help?

Answer

Pascal Thivent picture Pascal Thivent · Oct 4, 2009

What about:

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Formatter;

public static String SHAsum(byte[] convertme) throws NoSuchAlgorithmException{
    MessageDigest md = MessageDigest.getInstance("SHA-1"); 
    return byteArray2Hex(md.digest(convertme));
}

private static String byteArray2Hex(final byte[] hash) {
    Formatter formatter = new Formatter();
    for (byte b : hash) {
        formatter.format("%02x", b);
    }
    return formatter.toString();
}

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