Verify the certificate chain of the signature's certificate. Use this function to find out if you can trust the identity of the signer. getErrorMessage() will return an error message if this function fails (return value not #rc_ok) or the verification result returned is not #ccs_ok or getCertificateRevocationState() won't return #crs_ok. Call getCertificateRevocationState() after this function to get the revocation state. This function fails for document time stamps, see getMethod() and verifyTimeStampCertificateChain().

public CertificateChainState verifyCertificateChain(
	SignDocVerificationParameters params
)