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+/*
+ * Copyright (C) 2024 Mikael Magnusson <mikma@users.sourceforge.net>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/**
+ * # Crypto
+ *
+ * The `crypto` module provides message digest and message signing and
+ * verification. There are two alternative implementations, `crypto_openssl`
+ * and `crypto_mbedtls`. The `crypto_openssl` is preferred if available since
+ * it supports EdDSA in addition to all algorithms supported
+ * by `crypto_mbedtls`.
+ *
+ * @module crypto
+ */
+
+/**
+ * Represents a public key context.
+ *
+ * @class module:crypto.pk
+ * @hideconstructor
+ */
+
+/**
+ * @function module:crypto#md_digest
+ *
+ * @param {string} alg
+ * Message digest algorithm.
+ *
+ * @param {string} input
+ * Input to the message digest algorithm.
+ *
+ * @returns {string}
+ */
+
+/**
+ * @function module:crypto#pk
+ *
+ * @returns {crypto.pk}
+ */
+
+/**
+ * @function module:crypto.pk#get_public_key
+ *
+ * @returns {?string} - Public key in DER format.
+ */
+
+/**
+ * @function module:crypto.pk#keygen
+ *
+ * @param {('EC'|'RSA'|'ED25519')} type
+ * Public key type.
+ *
+ * @param {('P-192'|'P-224'|'P-256'|'P-384'|'P-521'|'brainpoolP256r1'|'brainpoolP384r1'|'brainpoolP512r1'|number)} [param]
+ * EC curve name (`string`), or RSA key length (`number`).
+ *
+ * @returns {string}
+ */
+
+/**
+ * @function module:crypto.pk#set_public_key
+ *
+ * @param {?string} key
+ * A public key in DER format.
+ */
+
+/**
+ * Available only if the `crypto_openssl` module is installed.
+ *
+ * @function module:crypto.pk#set_raw_public_key
+ *
+ * @param {('ED25519'|'ED448')} type
+ * @param {string} key
+ * Public key in raw format.
+ */
+
+/**
+ * @function module:crypto.pk#sign
+ *
+ * @param {?('SHA1'|'SHA224'|'SHA256'|'SHA384'|'SHA512'|string)} alg
+ * The message digest algorithm.
+ *
+ * @param {string} input
+ * The message to be signed.
+ *
+ * @returns {string}
+ */
+
+/**
+ * @function module:crypto.pk#verify
+ *
+ * @param {?('SHA1'|'SHA224'|'SHA256'|'SHA384'|'SHA512'|string)} alg
+ * The message digest algorithm.
+ *
+ * @param {string} input
+ * The message to be verified.
+ *
+ * @param {string} sig
+ * The signature to be verified.
+ *
+ * @returns {boolean}
+ */
+
+let crypto;
+
+try {
+	crypto = require('crypto_openssl');
+} catch {
+	try {
+		crypto = require('crypto_mbedtls');
+	} catch {
+		die(`No module named 'crypto_openssl' or 'crypto_mbedtls' could be found`);
+	}
+}
+
+export
+function md_digest(...args) {
+	return crypto.md_digest(...args);
+};
+
+export
+function md_list(...args) {
+	return crypto.md_list(...args);
+};
+
+export
+function pk_list(...args) {
+	return crypto.pk_list(...args);
+};
+
+export
+function pk(...args) {
+	return crypto.pk(...args);
+};