Java 类org.jivesoftware.smack.util.SHA1 实例源码

private static double generateAngle(String identifier, int correction) {
    String hash = SHA1.hex(identifier);
    String first16bits = hash.substring(0, 4);
    String littleEndian = first16bits.substring(2) + first16bits.substring(0, 2);
    double angle = (double) Integer.parseInt(littleEndian, 16) / 65535 * 2 * Math.PI;

    switch (correction) {
        case CORRECTION_REDGREEN:
            angle /= 2;
            break;
        case CORRECTION_BLUE:
            angle = (angle / 2) + (Math.PI / 2);
            break;
    }

    return angle;
}

/**
 * Returns a SHA-1 digest of the given parameters as specified in <a
 * href="http://xmpp.org/extensions/xep-0065.html#impl-socks5">XEP-0065</a>.
 * 
 * @param sessionID for the SOCKS5 Bytestream
 * @param initiatorJID JID of the initiator of a SOCKS5 Bytestream
 * @param targetJID JID of the target of a SOCKS5 Bytestream
 * @return SHA-1 digest of the given parameters
 */
public static String createDigest(String sessionID, String initiatorJID, String targetJID) {
    StringBuilder b = new StringBuilder();
    b.append(sessionID).append(initiatorJID).append(targetJID);
    return SHA1.hex(b.toString());
}