PKIX1 { }
DEFINITIONS IMPLICIT TAGS ::=
BEGIN
id-ce OBJECT IDENTIFIER  ::=  {joint-iso-ccitt(2) ds(5) 29}
id-ce-authorityKeyIdentifier OBJECT IDENTIFIER ::=  {i d-ce 35 }
AuthorityKeyIdentifier ::= SEQUENCntifier
id-ce-keyUsage OBJECT IDENTIFIER ::=  { id-ce 15 }
KeyUsage ::= BIT STRING {
     digitalSignature        (0),
     nonRe,
     notAfter        [1]     GeneralizedTime OPTIONAL }
     -- either notBefore or no
     policyQualifiers   SEQUENCE SIZE (NAL }
   F