Implemented configuration classes.

src/Eloquent/Otis/Configuration/AbstractOtpConfiguration.php

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+<?php
+
+/*
+ * This file is part of the Otis package.
+ *
+ * Copyright © 2013 Erin Millard
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Eloquent\Otis\Configuration;
+
+/**
+ * An abstract base class for implementing OTP configurations.
+ */
+abstract class AbstractOtpConfiguration implements OtpConfigurationInterface
+{
+    /**
+     * Construct a new OTP configuration.
+     *
+     * @param integer|null       $digits       The number of password digits.
+     * @param integer|null       $secretLength The length of the shared secret.
+     * @param HashAlgorithm|null $algorithm    The underlying algorithm to use.
+     */
+    public function __construct(
+        $digits = null,
+        $secretLength = null,
+        HashAlgorithm $algorithm = null
+    ) {
+        if (null === $digits) {
+            $digits = 6;
+        }
+        if (null === $secretLength) {
+            $secretLength = 10;
+        }
+        if (null === $algorithm) {
+            $algorithm = HashAlgorithm::SHA1();
+        }
+
+        $this->digits = $digits;
+        $this->secretLength = $secretLength;
+        $this->algorithm = $algorithm;
+    }
+
+    /**
+     * Get the number of password digits.
+     *
+     * @return integer The number of digits.
+     */
+    public function digits()
+    {
+        return $this->digits;
+    }
+
+    /**
+     * Get the length of the shared secret.
+     *
+     * @return integer The secret length.
+     */
+    public function secretLength()
+    {
+        return $this->secretLength;
+    }
+
+    /**
+     * Get the underlying algorithm name.
+     *
+     * @return HashAlgorithm The algorithm name.
+     */
+    public function algorithm()
+    {
+        return $this->algorithm;
+    }
+
+    private $digits;
+    private $secretLength;
+    private $algorithm;
+}

src/Eloquent/Otis/Configuration/HashAlgorithm.php

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+<?php
+
+/*
+ * This file is part of the Otis package.
+ *
+ * Copyright © 2013 Erin Millard
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Eloquent\Otis\Configuration;
+
+use Eloquent\Enumeration\Enumeration;
+
+/**
+ * The available hash algorithms.
+ */
+final class HashAlgorithm extends Enumeration
+{
+    /**
+     * The SHA-1 hash algorithm.
+     *
+     * @link http://tools.ietf.org/html/rfc3174
+     */
+    const SHA1 = 'sha1';
+
+    /**
+     * The SHA-256 hash algorithm.
+     *
+     * @link http://tools.ietf.org/html/rfc6234
+     */
+    const SHA256 = 'sha256';
+
+    /**
+     * The SHA-512 hash algorithm.
+     *
+     * @link http://tools.ietf.org/html/rfc6234
+     */
+    const SHA512 = 'sha512';
+}