When xca is used to export a PKCS #7 (.p7b) file, the created file does not conform to the certs-only format specified in RFC 3851. Specifically, according to section 3.7 of RFC 3851, the "SignedData encapContentInfo eContent field MUST be absent". However, xca creates an eContent field that is an empty OCTET STRING. I found this problem in both version 0.5.1 and 0.6.4 of xca.
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