org.herodbx.scram100b2.common.ScramMechanism Maven / Gradle / Ivy

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/*
 * Copyright 2017, OnGres.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
 * disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
 * following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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package org.herodbx.scram100b2.common;


import java.security.MessageDigest;

import javax.crypto.Mac;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.SecretKeySpec;


/**
 * Definition of the functionality to be provided by every ScramMechanism.
 *
 * Every ScramMechanism implemented must provide implementations of their respective {@link MessageDigest}
 * and {@link Mac} that will not throw a RuntimeException on any JVM, to guarantee true portability of this library.
 */
public interface ScramMechanism {
    /**
     * The name of the mechanism, which must be a value registered under IANA:
     * 
     *      SASL SCRAM Family Mechanisms
     * @return The mechanism name
     */
    String getName();

    /**
     * Gets a constructed {@link MessageDigest} instance, according to the algorithm of the SCRAM mechanism.
     * @return The MessageDigest instance
     * @throws RuntimeException If the MessageDigest instance of the algorithm is not provided by current JVM
     */
    MessageDigest getMessageDigestInstance() throws RuntimeException;

    /**
     * Gets a constructed {@link Mac} instance, according to the algorithm of the SCRAM mechanism.
     * @return The Mac instance
     * @throws RuntimeException If the Mac instance of the algorithm is not provided by current JVM
     */
    Mac getMacInstance() throws RuntimeException;

    /**
     * Generates a key of the algorith used, based on the key given.
     * @param key The bytes of the key to use
     * @return The instance of SecretKeySpec
     */
    SecretKeySpec secretKeySpec(byte[] key);

    /**
     * Gets a SecretKeyFactory for the given algorithm.
     * @return The SecretKeyFactory
     */
    SecretKeyFactory secretKeyFactory();

    /**
     * Returns the length of the key length  of the algorithm.
     * @return The length (in bits)
     */
    int algorithmKeyLength();

    /**
     * Whether this mechanism supports channel binding
     * @return True if it supports channel binding, false otherwise
     */
    boolean supportsChannelBinding();
}