Android Snippet: MAking a md5 hash from a string in Java

Security is always an issue when you connect your application to the web. Here is a nice little method that will let you implement md5 encryption.

private String md5(String in) {
    MessageDigest digest;
    try {
        digest = MessageDigest.getInstance("MD5");
        digest.reset();
        digest.update(in.getBytes());
        byte[] a = digest.digest();
        int len = a.length;
        StringBuilder sb = new StringBuilder(len << 1);
        for (int i = 0; i < len; i++) {
            sb.append(Character.forDigit((a[i] & 0xf0) >> 4, 16));
            sb.append(Character.forDigit(a[i] & 0x0f, 16));
        }
        return sb.toString();
    } catch (NoSuchAlgorithmException e) { e.printStackTrace(); }
    return null;
}

How to use:

String unsecurepassword = "unhackablepassword";
String securepassword = md5(unsecurepassword );

Please mind that md5 is not decryptable. If you need an encryption that you can reverse you will have to look into something other then md5. (AES for example)