118 lines
2.8 KiB
PHP
118 lines
2.8 KiB
PHP
<?php
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namespace Activitypub;
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/**
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* ActivityPub Signature Class
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*
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* @author Matthias Pfefferle
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*/
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class Signature {
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/**
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* @param int $user_id
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*
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* @return mixed
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*/
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public static function get_public_key( $user_id, $force = false ) {
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$key = \get_user_meta( $user_id, 'magic_sig_public_key' );
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if ( $key && ! $force ) {
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return $key[0];
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}
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self::generate_key_pair( $user_id );
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$key = \get_user_meta( $user_id, 'magic_sig_public_key' );
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return $key[0];
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}
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/**
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* @param int $user_id
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*
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* @return mixed
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*/
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public static function get_private_key( $user_id, $force = false ) {
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$key = \get_user_meta( $user_id, 'magic_sig_private_key' );
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if ( $key && ! $force ) {
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return $key[0];
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}
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self::generate_key_pair( $user_id );
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$key = \get_user_meta( $user_id, 'magic_sig_private_key' );
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return $key[0];
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}
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/**
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* Generates the pair keys
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*
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* @param int $user_id
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*/
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public static function generate_key_pair( $user_id ) {
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$config = array(
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'digest_alg' => 'sha512',
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'private_key_bits' => 2048,
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'private_key_type' => \OPENSSL_KEYTYPE_RSA,
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);
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$key = \openssl_pkey_new( $config );
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$priv_key = null;
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\openssl_pkey_export( $key, $priv_key );
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// private key
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\update_user_meta( $user_id, 'magic_sig_private_key', $priv_key );
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$detail = \openssl_pkey_get_details( $key );
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// public key
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\update_user_meta( $user_id, 'magic_sig_public_key', $detail['key'] );
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}
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public static function generate_signature( $user_id, $url, $date, $digest = null ) {
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$key = self::get_private_key( $user_id );
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$url_parts = \wp_parse_url( $url );
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$host = $url_parts['host'];
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$path = '/';
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// add path
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if ( ! empty( $url_parts['path'] ) ) {
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$path = $url_parts['path'];
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}
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// add query
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if ( ! empty( $url_parts['query'] ) ) {
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$path .= '?' . $url_parts['query'];
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}
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if ( ! empty( $digest ) ) {
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$signed_string = "(request-target): post $path\nhost: $host\ndate: $date\ndigest: SHA-256=$digest";
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} else {
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$signed_string = "(request-target): post $path\nhost: $host\ndate: $date";
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}
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$signature = null;
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\openssl_sign( $signed_string, $signature, $key, \OPENSSL_ALGO_SHA256 );
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$signature = \base64_encode( $signature ); // phpcs:ignore
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$key_id = \get_author_posts_url( $user_id ) . '#main-key';
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if ( ! empty( $digest ) ) {
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return \sprintf( 'keyId="%s",algorithm="rsa-sha256",headers="(request-target) host date digest",signature="%s"', $key_id, $signature );
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} else {
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return \sprintf( 'keyId="%s",algorithm="rsa-sha256",headers="(request-target) host date",signature="%s"', $key_id, $signature );
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}
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}
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public static function verify_signature( $headers, $signature ) {
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}
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public static function generate_digest( $body ) {
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$digest = \base64_encode( \hash('sha256', $body, true ) ); // phpcs:ignore
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return "$digest";
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}
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}
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