THPDFHeadlessTimestampDigest

THPDFHeadlessTimestampDigest = (htdSHA256, htdSHA384, htdSHA512);

Selects the actual RFC3161 messageImprint digest algorithm for the ForImprint functions in HPDFHeadlessTimestamp

ValueRequired imprint bytesDigest OID
htdSHA256322.16.840.1.101.3.4.2.1
htdSHA384482.16.840.1.101.3.4.2.2
htdSHA512642.16.840.1.101.3.4.2.3

The supplied imprint is used directly rather than hashed again; a digest-length mismatch fails before transport

See Native RFC3161 timestamps for transport and trust configuration