Java coding for validating x 509 certificate
If the Subject Key Identifier is not present the key identifier is calculated using the standard method, a SHA-1 hash of the public key data which is defined in RFC 3280.
The most common one of these is the extension Request attribute defined in PKCS#9, which is used to include extensions that are to be added to the certificate generated by the CA that processes the request.
The following value can be used in place of is a self-signed certificate that can be verified using the public key it contains and the algorithm defined in signature Algorithm.
Before looking at creation of version 3 certificates it is worth having a brief look at certificate extensions.
You can think of it as the equivalent to a pointer to the parent certificate. The Bouncy Castle APIs include a helper class for creating or containing this extension.
It can be found in the This will create an Authority Key Identifier extension which is populated with the issuer name, serial number of the certificate, and the standard key identifier, based on the Subject Key Identifier extension of ca Cert if ca Cert contains the extension.
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This is a facility that was added in X.509 version 3 and a lot of the flexibility that Version 3 certificates provide derive from it.