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A.1 Certificate Syntax Connected: An Internet Encyclopedia
A.1 Certificate Syntax

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A.1 Certificate Syntax

A.1 Certificate Syntax

The X.509 certificate format is defined by the following ASN.1 syntax:

   Certificate ::= SIGNED SEQUENCE{
           version [0]     Version DEFAULT v1988,
           serialNumber    CertificateSerialNumber,
           signature       AlgorithmIdentifier,
           issuer          Name,
           validity        Validity,
           subject         Name,
           subjectPublicKeyInfo    SubjectPublicKeyInfo}


   Version ::=     INTEGER {v1988(0)}

   CertificateSerialNumber ::=     INTEGER


   Validity ::=    SEQUENCE{
           notBefore       UTCTime,
           notAfter        UTCTime}

   SubjectPublicKeyInfo ::=        SEQUENCE{
           algorithm               AlgorithmIdentifier,
           subjectPublicKey        BIT STRING}

   AlgorithmIdentifier ::= SEQUENCE{
           algorithm       OBJECT IDENTIFIER,
           parameters      ANY DEFINED BY algorithm OPTIONAL}

The components of this structure are defined by ASN.1 syntax defined in the X.500 Series Recommendations. RFC 1423 provides references for and the values of AlgorithmIdentifiers used by PEM in the subjectPublicKeyInfo and the signature data items. It also describes how a signature is generated and the results represented. Because the certificate is a signed data object, the distinguished encoding rules (see X.509, section 8.7) must be applied prior to signing.


Next: A.2 Certificate Revocation List Syntax

Connected: An Internet Encyclopedia
A.1 Certificate Syntax

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