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     *                                          policy.
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     *                                          policy.
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     *
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     *
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     * @return array The values needed to construct a signed URL or cookie
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     * @return array The values needed to construct a signed URL or cookie
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     * @throws \InvalidArgumentException  when not provided either a policy or a
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     * @throws \InvalidArgumentException  when not provided either a policy or a
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     *                                    resource and a expires
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     *                                    resource and a expires
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     * @throws \RuntimeException when generated signature is empty
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     *
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     *
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     * @link http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/private-content-signed-cookies.html
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     * @link http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/private-content-signed-cookies.html
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     */
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     */
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    public function getSignature($resource = null, $expires = null, $policy = null)
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    public function getSignature($resource = null, $expires = null, $policy = null)
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    {
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    {
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    }
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    }
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    private function sign($policy)
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    private function sign($policy)
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    {
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    {
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        $signature = '';
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        $signature = '';
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        if(!openssl_sign($policy, $signature, $this->pkHandle)) {
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            $errorMessages = [];
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            while(($newMessage = openssl_error_string()) !== false) {
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                $errorMessages[] = $newMessage;
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            }
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            $exceptionMessage = "An error has occurred when signing the policy";
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            if (count($errorMessages) > 0) {
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                $exceptionMessage = implode("\n", $errorMessages);
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            }
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            throw new \RuntimeException($exceptionMessage);
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        openssl_sign($policy, $signature, $this->pkHandle);
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        }
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        return $signature;
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        return $signature;