X509_STORE_CTX_get_error_depth() returns a non-negative error depth.
-X509_STORE_CTX_get_current_cert() returns the cerificate which caused the
+X509_STORE_CTX_get_current_cert() returns the certificate which caused the
error or B<NULL> if no certificate is relevant to the error.
X509_verify_cert_error_string() returns a human readable error string for