When sending a GET SCEP request, the parameter given in the URL is encoded in base64 (as per https://tools.ietf.org/html/draft-gutmann-scep-10#section-4.1):
"When using GET messages to communicate binary data, base64 encoding
as specified in [2] MUST be used. The base64 encoded data is
distinct from "base64url" and may contain URI reserved characters,
thus it MUST be escaped as specified in [8] in addition to being
base64 encoded. Finally, the encoded data is inserted into the
MESSAGE portion of the HTTP GET request."
However in the implementation the message is not decoded.
Could you please have a look at it?
Thank you!