Load an X509 Certificate from the file specified by "cert" where cert = File containing an x509 certificate, x509 = Index into an internal array of certificates.
Extracts the RSA public key from the X509 specified by "x509" and stores it in "rsa" where x509 = Index into internal array of x509 certificates, rsa =Index into internal array of RSA public keys.
Verifies that the X509 certificate specified by "x509" was issued by one of the X509 certificates (in PEM format) in "trusted_certs", where x509 = Index into internal array of certificates, trusted_certs = Certificates (in PEM text format) to find the x50
Returns 1 on successful find, 0 if certificate isn't in trusted_certs, or other error.