OID value: 2.16.840.1.113730.3.1.40
OID description:
A PKCS#7 [RFC2315] SignedData, where the content that is signed is ignored by consumers of userSMIMECertificate values. It is recommended that values have a 'contentType' of data with an absent 'content' field. Values of this attribute contain a person's entire certificate chain and an smimeCapabilities field [RFC2633] that at a minimum describes their SMIME algorithm capabilities. Values for this attribute are to be stored and requested in binary form, as 'userSMIMECertificate;binary'. If available, this attribute is preferred over the userCertificate attribute for S/MIME applications.
( 2.16.840.1.113730.3.1.40
NAME 'userSMIMECertificate'
DESC 'PKCS#7 SignedData used to support S/MIME'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.5 )
URL for further info: http://www.ietf.org/rfc/rfc2798.txt
See also the OID Repository website reference for 2.16.840.1.113730.3.1.40