<?php

namespace Badcow\DNS;

/**
 * Algorithms listed in {@link https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xml}.
 */
class Algorithms
{
	/**
	 * Delete DS.
	 *
	 * {@link https://tools.ietf.org/html/rfc8078#section-4}
	 */
	const DELETE = 0;

	/**
	 * RSA/MD5.
	 *
	 * {@link https://tools.ietf.org/html/rfc4034#appendix-A.1}
	 */
	const RSAMD5 = 1;

	/**
	 * Diffie-Hellman.
	 *
	 * {@link https://tools.ietf.org/html/rfc4034#appendix-A.1}
	 */
	const DH = 2;

	/**
	 * DSA/SHA-1.
	 *
	 * {@link https://tools.ietf.org/html/rfc4034#appendix-A.1}
	 */
	const DSA = 3;

	/**
	 * Elliptic Curve (Proposed).
	 *
	 * {@link https://tools.ietf.org/html/rfc4034#appendix-A.1}
	 */
	const ECC = 4;

	/**
	 * RSA/SHA-1.
	 *
	 * {@link https://tools.ietf.org/html/rfc4034#appendix-A.1}
	 */
	const RSASHA1 = 5;

	/**
	 * DSA-NSEC3-SHA1.
	 *
	 * {@link https://tools.ietf.org/html/RFC5155}
	 */
	const DSA_NSEC3_SHA1 = 6;

	/**
	 * RSASHA1-NSEC3-SHA1.
	 *
	 * {@link https://tools.ietf.org/html/RFC5155}
	 */
	const RSASHA1_NSEC3_SHA1 = 7;

	/**
	 * RSA/SHA-256.
	 *
	 * {@link https://tools.ietf.org/html/RFC5702}
	 */
	const RSASHA256 = 8;

	/**
	 * RSA/SHA-512.
	 *
	 * {@link https://tools.ietf.org/html/RFC5702}.
	 */
	const RSASHA512 = 10;

	/**
	 * GOST R 34.10-2001.
	 *
	 * {@link https://tools.ietf.org/html/RFC5933}.
	 */
	const ECC_GOST = 12;

	/**
	 * ECDSA Curve P-256 with SHA-256.
	 *
	 * {@link https://tools.ietf.org/html/RFC6605}.
	 */
	const ECDSAP256SHA256 = 13;

	/**
	 * ECDSA Curve P-384 with SHA-384.
	 *
	 * {@link https://tools.ietf.org/html/RFC6605}.
	 */
	const ECDSAP384SHA384 = 14;

	/**
	 * Ed25519.
	 *
	 * {@link https://tools.ietf.org/html/RFC8080}.
	 */
	const ED25519 = 15;

	/**
	 * Ed448.
	 *
	 * {@link https://tools.ietf.org/html/RFC8080}.
	 */
	const ED448 = 16;

	/**
	 * Indirect.
	 *
	 * {@link https://tools.ietf.org/html/rfc4034#appendix-A.1}
	 */
	const INDIRECT = 252;

	/**
	 * Private.
	 *
	 * {@link https://tools.ietf.org/html/rfc4034#appendix-A.1}
	 */
	const PRIVATEDNS = 253;

	/**
	 * Private.
	 *
	 * {@link https://tools.ietf.org/html/rfc4034#appendix-A.1}
	 */
	const PRIVATEOID = 254;

	/** @var array */
	const MNEMONICS = [
	    self::DELETE => 'DELETE',
	    self::RSAMD5 => 'RSAMD5',
	    self::DH => 'DH',
	    self::DSA => 'DSA',
	    self::ECC => 'ECC',
	    self::RSASHA1 => 'RSASHA1',
	    self::DSA_NSEC3_SHA1 => 'DSA-NSEC3-SHA1',
	    self::RSASHA1_NSEC3_SHA1 => 'RSASHA1-NSEC3-SHA1',
	    self::RSASHA256 => 'RSASHA256',
	    self::RSASHA512 => 'RSASHA512',
	    self::ECC_GOST => 'ECC-GOST',
	    self::ECDSAP256SHA256 => 'ECDSAP256SHA256',
	    self::ECDSAP384SHA384 => 'ECDSAP384SHA384',
	    self::ED25519 => 'ED25519',
	    self::ED448 => 'ED448',
	    self::INDIRECT => 'INDIRECT',
	    self::PRIVATEDNS => 'PRIVATEDNS',
	    self::PRIVATEOID => 'PRIVATEOID',
	];

	/**
	 * Get the associated mnemonic of an algorithm.
	 *
	 * @param int $algorithmId
	 *
	 * @return string
	 *
	 * @throws \InvalidArgumentException
	 */
	public static function getMnemonic(int $algorithmId)
	{
		if (!array_key_exists($algorithmId, self::MNEMONICS)) {
		    throw new \InvalidArgumentException(sprintf('"%d" is not a valid algorithm.', $algorithmId));
		}

		return self::MNEMONICS[$algorithmId];
	}


	/**
	 * @param string $algorithmMnemonic
	 *
	 * @return int
	 *
	 * @throws \InvalidArgumentException
	 */
	public static function getAlgorithmValue(string $algorithmMnemonic): int
	{
		if (false === $keyTypeValue = array_search($algorithmMnemonic, self::MNEMONICS, true)) {
		    throw new \InvalidArgumentException(sprintf('"%s" is not a valid algorithm mnemonic.', $algorithmMnemonic));
		}

		return (int) $keyTypeValue;
	}
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NDk5ODUyMDY5NzE0MDk4MCAxODY5NTczNzY3NTAyNjMyIDk0NzQ1ODY2NTg2MTc4Njc=