| Key Usage Extension (OID = 2.5.29.15).
The ASN.1 definition for Key Usage Extension is:
id-ce-keyUsage OBJECT IDENTIFIER ::= { id-ce 15 }
KeyUsage ::= BIT STRING {
digitalSignature (0),
nonRepudiation (1),
keyEncipherment (2),
dataEncipherment (3),
keyAgreement (4),
keyCertSign (5),
cRLSign (6),
encipherOnly (7),
decipherOnly (8)
}
(as specified in RFC 3280 http://www.ietf.org/rfc/rfc3280.txt)
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