| The type of data to be passed to any custom signer.
The DataType type is a flags type enumeration so different
values can be combined together using bitwise operations. It may
take the following values:
- Pkcs9Digest - When signing the callback will be provided with a
PKCS9 ASN.1 encoded byte array containing the digest of the PDF
content and attributes to be authenticated.
- RawDigest - When signing the callback will be provided with a
hashed digest of the document data.
- TimeStampDigest - When time stamping provide the callback with
a hashed digest, the time stamp message imprint, rather than an RFC
3161 time stamp request.
- TimeStampToken - When time stamping the callback will return a
time stamp token rather than an RFC 3161 time stamp response.
- NoEmbeddedTimeStampUrl - Do not use any supplied URL to embed a
time stamp.
- NoEmbeddedTimeStampCustom - Do not use any supplied callback to
embed a time stamp.
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