MD5

External

• https://en.wikipedia.org/wiki/MD5

Internal

• Cryptography
• SHA-1

Overview

MD5 is a cryptographically secure message digest algorithm. It takes an arbitrary-sized input - a byte array - and generates a fixed size output, called a digest or hash. MD5 produces a 16 byte digest (128 bit).

Computing MD5

OpenSSL

An MD5 hash can be generated with OpenSSL.

Java

https://github.com/NovaOrdis/playground/tree/master/java/security/encryption

import java.security.MessageDigest;

public static byte[] getMD5(byte[] b) throws Exception {

    MessageDigest md = MessageDigest.getInstance("MD5");
    return md.digest(b);
}