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Editing: class-wp-recovery-mode-key-service.php

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<?php
/**
 * Error Protection API: WP_Recovery_Mode_Key_Service class
 *
 * @package WordPress
 * @since 5.2.0
 */

/**
 * Core class used to generate and validate keys used to enter Recovery Mode.
 *
 * @since 5.2.0
 */
#[AllowDynamicProperties]
final class WP_Recovery_Mode_Key_Service {

/**
	 * The option name used to store the keys.
	 *
	 * @since 5.2.0
	 * @var string
	 */
	private $option_name = 'recovery_keys';

/**
	 * Creates a recovery mode token.
	 *
	 * @since 5.2.0
	 *
	 * @return string A random string to identify its associated key in storage.
	 */
	public function generate_recovery_mode_token() {
		return wp_generate_password( 22, false );
	}

/**
	 * Creates a recovery mode key.
	 *
	 * @since 5.2.0
	 *
	 * @global PasswordHash $wp_hasher Portable PHP password hashing framework instance.
	 *
	 * @param string $token A token generated by {@see generate_recovery_mode_token()}.
	 * @return string Recovery mode key.
	 */
	public function generate_and_store_recovery_mode_key( $token ) {

global $wp_hasher;

$key = wp_generate_password( 22, false );

if ( empty( $wp_hasher ) ) {
			require_once ABSPATH . WPINC . '/class-phpass.php';
			$wp_hasher = new PasswordHash( 8, true );
		}

$hashed = $wp_hasher->HashPassword( $key );

$records = $this->get_keys();

$records[ $token ] = array(
			'hashed_key' => $hashed,
			'created_at' => time(),
		);

$this->update_keys( $records );

/**
		 * Fires when a recovery mode key is generated.
		 *
		 * @since 5.2.0
		 *
		 * @param string $token The recovery data token.
		 * @param string $key   The recovery mode key.
		 */
		do_action( 'generate_recovery_mode_key', $token, $key );

return $key;
	}

/**
	 * Verifies if the recovery mode key is correct.
	 *
	 * Recovery mode keys can only be used once; the key will be consumed in the process.
	 *
	 * @since 5.2.0
	 *
	 * @global PasswordHash $wp_hasher Portable PHP password hashing framework instance.
	 *
	 * @param string $token The token used when generating the given key.
	 * @param string $key   The unhashed key.
	 * @param int    $ttl   Time in seconds for the key to be valid for.
	 * @return true|WP_Error True on success, error object on failure.
	 */
	public function validate_recovery_mode_key( $token, $key, $ttl ) {
		global $wp_hasher;

$records = $this->get_keys();

if ( ! isset( $records[ $token ] ) ) {
			return new WP_Error( 'token_not_found', __( 'Recovery Mode not initialized.' ) );
		}

$record = $records[ $token ];

$this->remove_key( $token );

if ( ! is_array( $record ) || ! isset( $record['hashed_key'], $record['created_at'] ) ) {
			return new WP_Error( 'invalid_recovery_key_format', __( 'Invalid recovery key format.' ) );
		}

if ( empty( $wp_hasher ) ) {
			require_once ABSPATH . WPINC . '/class-phpass.php';
			$wp_hasher = new PasswordHash( 8, true );
		}

if ( ! $wp_hasher->CheckPassword( $key, $record['hashed_key'] ) ) {
			return new WP_Error( 'hash_mismatch', __( 'Invalid recovery key.' ) );
		}

if ( time() > $record['created_at'] + $ttl ) {
			return new WP_Error( 'key_expired', __( 'Recovery key expired.' ) );
		}

return true;
	}

/**
	 * Removes expired recovery mode keys.
	 *
	 * @since 5.2.0
	 *
	 * @param int $ttl Time in seconds for the keys to be valid for.
	 */
	public function clean_expired_keys( $ttl ) {

$records = $this->get_keys();

foreach ( $records as $key => $record ) {
			if ( ! isset( $record['created_at'] ) || time() > $record['created_at'] + $ttl ) {
				unset( $records[ $key ] );
			}
		}

$this->update_keys( $records );
	}

/**
	 * Removes a used recovery key.
	 *
	 * @since 5.2.0
	 *
	 * @param string $token The token used when generating a recovery mode key.
	 */
	private function remove_key( $token ) {

$records = $this->get_keys();

if ( ! isset( $records[ $token ] ) ) {
			return;
		}

unset( $records[ $token ] );

$this->update_keys( $records );
	}

/**
	 * Gets the recovery key records.
	 *
	 * @since 5.2.0
	 *
	 * @return array Associative array of $token => $data pairs, where $data has keys 'hashed_key'
	 *               and 'created_at'.
	 */
	private function get_keys() {
		return (array) get_option( $this->option_name, array() );
	}

/**
	 * Updates the recovery key records.
	 *
	 * @since 5.2.0
	 *
	 * @param array $keys Associative array of $token => $data pairs, where $data has keys 'hashed_key'
	 *                    and 'created_at'.
	 * @return bool True on success, false on failure.
	 */
	private function update_keys( array $keys ) {
		return update_option( $this->option_name, $keys, false );
	}
}

Editing: class-wp-recovery-mode-key-service.php

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