Method getDigest

app/src/main/java/com/sun/mail/pop3/Protocol.java:407–419

Gets the APOP message digest. From RFC 1939: The 'digest' parameter is calculated by applying the MD5 algorithm [RFC1321] to a string consisting of the timestamp (including angle-brackets) followed by a shared secret. The 'digest' parameter itself is a 16-octet value which is sent in hexadecimal fo

(String password)

     * @return		The APOP digest or an empty string if an error occurs.
     */
    private String getDigest(String password) {
	String key = apopChallenge + password;
	byte[] digest;
	try {
	    MessageDigest md = MessageDigest.getInstance("MD5");
	    digest = md.digest(key.getBytes("iso-8859-1"));	// XXX
	} catch (NoSuchAlgorithmException nsae) {
	    return null;
	} catch (UnsupportedEncodingException uee) {
	    return null;
	}
	return toHex(digest);
    }

    /**
     * Abstract base class for POP3 authentication mechanism implementations.