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<?php |
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/** |
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* Security |
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* |
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* @author Pronamic <[email protected]> |
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* @copyright 2005-2018 Pronamic |
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* @license GPL-3.0-or-later |
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* @package Pronamic\WordPress\Pay\Gateways\OmniKassa2 |
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*/ |
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namespace Pronamic\WordPress\Pay\Gateways\OmniKassa2; |
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use InvalidArgumentException; |
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/** |
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* Security |
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* |
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* @author Remco Tolsma |
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* @version 2.1.0 |
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* @since 1.0.0 |
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*/ |
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class Security { |
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/** |
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* Get signature fields combined. |
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* |
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* @param array $fields Fields. |
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* @return string |
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*/ |
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public static function get_signature_fields_combined( $fields ) { |
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return implode( ',', $fields ); |
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} |
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/** |
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* Calculdate signature for specific data. |
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* |
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* @param Signable $signable Signable object. |
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* @param string $signing_key Signing Key. |
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* @return string |
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* @throws InvalidArgumentException Signing key is invalid. |
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*/ |
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public static function get_signature( Signable $signable, $signing_key ) { |
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if ( empty( $signing_key ) ) { |
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throw new InvalidArgumentException( |
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sprintf( |
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'Signing key "%s" is empty.', |
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$signing_key |
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) |
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); |
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} |
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$decoded_signing_key = base64_decode( $signing_key ); |
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if ( false === $decoded_signing_key ) { |
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throw new InvalidArgumentException( |
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sprintf( |
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'Signing key "%s" contains character from outside the base64 alphabet.', |
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$signing_key |
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) |
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); |
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} |
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$fields = $signable->get_signature_fields(); |
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$combined = self::get_signature_fields_combined( $fields ); |
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$signature = hash_hmac( |
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'sha512', |
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$combined, |
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$decoded_signing_key |
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); |
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return $signature; |
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} |
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/** |
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* Validate signature. |
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* |
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* @param string $signature_a Signature A. |
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* @param string $signature_b Signature B. |
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* @return bool True if valid, false otherwise. |
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*/ |
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public static function validate_signature( $signature_a, $signature_b ) { |
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if ( empty( $signature_a ) || empty( $signature_b ) ) { |
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// Empty signature string or null from calculation. |
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return false; |
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} |
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return ( 0 === strcasecmp( $signature_a, $signature_b ) ); |
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} |
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} |
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wp-pay-gateways /
omnikassa-2
