Migrate Magento2 Argon hashed passwords to WordPress

mage_argon_wordpress.php

// Run migration on login process
add_filter( 'check_password', 'migrate_magento_password', 10, 4 );
function migrate_magento_password( $check, $password, $hash, $user_id ) {

    if ( $check ) {
        // password is valid, no need to migrate
        return $check;
    }

    // get Magento password data
    $mage_pwd_data = get_user_meta( $user_id, 'mage_pwd_data', true );
    if ( ! $mage_pwd_data ) {
        // exit early if we were unable to retrieve a Magento hashed password
        // means user typed a wrong WordPress password
        return $check;
    }

    $magento_pwd_parts = explode(':',  $mage_pwd_data);

    if ( ! is_array( $magento_pwd_parts ) ) {
        // Magento password data is not in the expected format
        return $check;
    }

    $hash = $magento_pwd_parts['0'];
    $salt = $magento_pwd_parts['1'];
    $params = explode( '_', $magento_pwd_parts['2'] );

    if ( ! is_array( $params ) ) {
        // Magento password data is not in the expected format
        return $check;
    }

    $seedBytes = $params['1'];
    $opsLimit = $params['2'];
    $memLimit = $params['3'];

    $calculated_hash = calculate_magento_hash($password, $seedBytes, $opsLimit, $memLimit, $salt);

    if ( $hash === $calculated_hash ) {

        // typed password matches Magento password
        // update user password to use this password
        wp_set_password( $password, $user_id );

        // migration completed for user, delete temporary data
        delete_user_meta( $user_id, 'mage_pwd_data' );

        return true;
    }

    return $check;

}

// This is the function from Magento source code to calculate Argon hash.
function calculate_magento_hash($data, $seedBytes, $opsLimit, $memLimit, $salt) {
    if (strlen($salt) < SODIUM_CRYPTO_PWHASH_SALTBYTES) {
        $salt = str_pad($salt, SODIUM_CRYPTO_PWHASH_SALTBYTES, $salt);
    } elseif (strlen($salt) > SODIUM_CRYPTO_PWHASH_SALTBYTES) {
        $salt = substr($salt, 0, SODIUM_CRYPTO_PWHASH_SALTBYTES);
    }

    return bin2hex(
        sodium_crypto_pwhash(
            $seedBytes,
            $data,
            $salt,
            $opsLimit,
            $memLimit,
            SODIUM_CRYPTO_PWHASH_ALG_ARGON2ID13
        )
    );
}