Nelmio\SecurityBundle\Signer::getVerifiedRawValue PHP Method

    public function getVerifiedRawValue($signedValue)
    {
        if (!$this->verifySignedValue($signedValue)) {
            throw new \InvalidArgumentException(sprintf("The signature for '%s' was invalid.", $signedValue));
        }
        $valueSignatureTuple = $this->splitSignatureFromSignedValue($signedValue);
        return $valueSignatureTuple[0];
    }