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The SignerInfo in the SignedData structure (section 2.3.2.4.1) MUST conform to the following constraints:
The authenticatedAttributes (section 2.3.2.4.4) field MUST be present.
This field MUST contain the following attributes:
A content-type attribute with its value set as specified in [PKCS7] section 9.2.
A message-digest attribute with its value set as specified in [PKCS7] section 9.2.
This field can also contain:
One SpcStatementType attribute (section 2.3.2.4.4.1), but this attribute MUST be ignored.
One SpcSpOpusInfo attribute (section 2.3.2.4.4.2).
If the signature has been timestamped, then the unauthenticatedAttributes field (section 2.3.2.4.5) MUST be present and MUST contain a single Countersignature attribute ([PKCS9] section 6.6). If the signature has not been timestamped, the unauthenticatedAttributes field MUST be absent.