anestisb@deephole:[~]: javac cmSSLTest.java
anestisb@deephole:[~]: java cmSSLTest legitimate.com *evil.com*
[-] Validation failed
anestisb@deephole:[~]: java cmSSLTest legitimate.com *.evil.com*
[-] Validation failed
anestisb@deephole:[~]: java cmSSLTest legitimate.com *.mate.com
[-] Validation failed
anestisb@deephole:[~]: java cmSSLTest legitimate.com *mate.com
[+] Validation was successful
anestisb@deephole:[~]:
anestisb@deephole:[~]: cat cmSSLTest.java
import java.util.Locale;

public class cmSSLTest {

    /* Copied from cm-11.0 branch:
     * https://github.com/CyanogenMod/android_libcore/blob/cm-11.0/luni/src/main/java/javax/net/ssl/DefaultHostnameVerifier.java
     */
    static private boolean verifyHostName(String hostName, String cn) {
        if (hostName == null || hostName.isEmpty() || cn == null || cn.isEmpty()) {
            return false;
        }

        cn = cn.toLowerCase(Locale.US);

        if (!cn.contains("*")) {
            return hostName.equals(cn);
        }

        if (cn.startsWith("*.") && hostName.regionMatches(0, cn, 2, cn.length() - 2)) {
            return true; // "*.foo.com" matches "foo.com"
        }

        int asterisk = cn.indexOf('*');
        int dot = cn.indexOf('.');
        if (asterisk > dot) {
            return false; // malformed; wildcard must be in the first part of the cn
        }

        if (!hostName.regionMatches(0, cn, 0, asterisk)) {
            return false; // prefix before '*' doesn't match
        }

        int suffixLength = cn.length() - (asterisk + 1);
        int suffixStart = hostName.length() - suffixLength;
        if (hostName.indexOf('.', asterisk) < suffixStart) {
            // TODO: remove workaround for *.clients.google.com http://b/5426333
            if (!hostName.endsWith(".clients.google.com")) {
                return false; // wildcard '*' can't match a '.'
            }
        }

        if (!hostName.regionMatches(suffixStart, cn, asterisk + 1, suffixLength)) {
            return false; // suffix after '*' doesn't match
        }

        return true;
    }

    public static void main(String[] args) {
        if (args.length != 2)
            System.out.println("Usage:\n\tjava cmSSLTest <hostname> <cert_cn>");
        else
            if(verifyHostName(args[0], args[1]))
                System.out.println("[+] Validation was successful");
            else
                System.out.println("[-] Validation failed");
    }
}