how to get the CA signature from Certificates

Hi All,

My client have passed the Certificates to me, then I use
CertCreateCertificateContext function get a PCCERT_CONTEXT. My
question is How do i get the CA signature of this Certificates?
I need to use the CA public-key to check this CA signature, I have get
the public-key from the CA root Certificate. Thanks!
.

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