2.2.2.7.9 szOID_ENCRYPTED_KEY_HASH
OID = 1.3.6.1.4.1.311.21.21.
Internal Name: szOID_ENCRYPTED_KEY_HASH.
Description: This value MUST be a hash used to identify the client's private key.<13> For specific client processing rules, see section 3.1.1.4.3.6.1.
Format: The hash value. This value MUST be encoded as an octet string.