(PureBasic) Load Java KeyStore and Access Contents

Loads a Java keystore file and iterates over the contents. A Java keystore (.jks) file can contain one or more trusted root certificate entries and/or one or more private key entries. Each private key entry includes an associated certificate chain.

Note: This example requires Chilkat v11.0.0 or greater.

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IncludeFile "CkCert.pb"
IncludeFile "CkJavaKeyStore.pb"
IncludeFile "CkCertChain.pb"
IncludeFile "CkPrivateKey.pb"

Procedure ChilkatExample()

    success.i = 0

    ; This requires the Chilkat API to have been previously unlocked.
    ; See Global Unlock Sample for sample code.

    jks.i = CkJavaKeyStore::ckCreate()
    If jks.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Load the Java keystore from a file.  The JKS file password is used
    ; to verify the keyed digest that is found at the very end of the keystore.
    ; It verifies there has been no tampering with the file.
    success = CkJavaKeyStore::ckLoadFile(jks,"jksFilePassword","/someDir/keyStore.jks")
    If success = 0
        Debug CkJavaKeyStore::ckLastErrorText(jks)
        CkJavaKeyStore::ckDispose(jks)
        ProcedureReturn
    EndIf

    ; Find out how many of each type of entry:
    numTrustedCerts.i = CkJavaKeyStore::ckNumTrustedCerts(jks)
    numPrivateKeys.i = CkJavaKeyStore::ckNumPrivateKeys(jks)

    cert.i = CkCert::ckCreate()
    If cert.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    alias.s

    ; For each trusted certificate, access it by getting
    ; it as a cert object.  Also get the alias associated with the certificate.
    Debug "Trusted Certs:"
    i.i = 0
    While i < numTrustedCerts
        success = CkJavaKeyStore::ckTrustedCertAt(jks,i,cert)
        Debug CkJavaKeyStore::ckGetTrustedCertAlias(jks,i) + ": " + CkCert::ckSubjectDN(cert)
        i = i + 1
    Wend

    privKey.i = CkPrivateKey::ckCreate()
    If privKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    certChain.i = CkCertChain::ckCreate()
    If certChain.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; For each private key entry, get the private key and
    ; the associated certificate chain.
    ; Each private key is password protected.  Usually it is the same
    ; password as used for the keyed digest of the entire JKS.  
    ; However, this does not have to be.  The password is passed
    ; here to handle the possibility of each private key requiring
    ; a different password.
    Debug "Private Keys:"
    i = 0
    While i < numPrivateKeys
        CkJavaKeyStore::ckPrivateKeyAt(jks,"jksFilePassword",i,privKey)
        Debug CkJavaKeyStore::ckGetPrivateKeyAlias(jks,i)
        CkJavaKeyStore::ckCertChainAt(jks,i,certChain)

        ; The 1st certificate in the chain is the one associated with the private key.
        CkCertChain::ckCertAt(certChain,0,cert)
        Debug CkCert::ckSubjectDN(cert)

        i = i + 1
    Wend


    CkJavaKeyStore::ckDispose(jks)
    CkCert::ckDispose(cert)
    CkPrivateKey::ckDispose(privKey)
    CkCertChain::ckDispose(certChain)


    ProcedureReturn
EndProcedure