oid

var ExtKeyUsage = asn1.ObjectIdentifier{2, 5, 29, 37}

ExtKeyUsage (id-ce-extKeyUsage) is defined in RFC 5280

Reference: https://www.rfc-editor.org/rfc/rfc5280.html#section-4.2.1.12

var KeyUsage = asn1.ObjectIdentifier{2, 5, 29, 15}

KeyUsage (id-ce-keyUsage) is defined in RFC 5280

Reference: https://www.rfc-editor.org/rfc/rfc5280.html#section-4.2.1.3

var Timestamping = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 8}

Timestamping (id-kp-timeStamping) is defined in RFC 3161 2.3

Reference: https://datatracker.ietf.org/doc/html/rfc3161#section-2.3