(PureBasic) Generate new DSA Key from OpenSSL Parameters File

Generates a new DSA key from an OpenSSL-created parameters file (DER and PEM formats supported). Examples of using OpenSSL to create parameter files are shown here:

openssl dsaparam -outform DER 1024 <  seedData.txt >dsaparam.der

openssl dsaparam 1024 < seedData.txt >dsaparam.pem

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkDsa.pb"

Procedure ChilkatExample()

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

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

    success.i = CkDsa::ckGenKeyFromParamsDerFile(dsa,"dsaparam.der")
    If success <> 1
        Debug CkDsa::ckLastErrorText(dsa)
        CkDsa::ckDispose(dsa)
        ProcedureReturn
    EndIf

    ; To generate a key from PEM, call GenKeyFromParamsPem 
    ; (for an in-memory PEM string) or GenKeyFromParamsFilePem
    ; for a PEM file.

    ; The public and private keys may now be exported to PEM, DER,
    ; and XML formatted files.

    pemStr.s
    xmlStr.s

    ; First for the public key...
    ; The public key never needs to be encrypted.

    ; Save the public key in PEM format:
    pemStr = CkDsa::ckToPublicPem(dsa)
    ; This example will not check the return value of SaveText...
    success = CkDsa::ckSaveText(dsa,pemStr,"dsa_pub.pem")

    ; Save the public key in DER format:
    success = CkDsa::ckToPublicDerFile(dsa,"dsa_pub.der")

    bPublicOnly.i = 1
    ; Save to XML
    xmlStr = CkDsa::ckToXml(dsa,bPublicOnly)
    success = CkDsa::ckSaveText(dsa,pemStr,"dsa_pub.xml")

    ; ------------------------------------
    ; Now for the private key....
    ; ------------------------------------

    ; Unencrypted PEM:
    pemStr = CkDsa::ckToPem(dsa)
    success = CkDsa::ckSaveText(dsa,pemStr,"dsa_priv.pem")

    ; Encrypted PEM:
    pemStr = CkDsa::ckToEncryptedPem(dsa,"myPassword")
    success = CkDsa::ckSaveText(dsa,pemStr,"dsa_privEncrypted.pem")

    ; DER:
    success = CkDsa::ckToDerFile(dsa,"dsa_priv.der")

    ; XML:
    bPublicOnly = 0
    xmlStr = CkDsa::ckToXml(dsa,bPublicOnly)
    success = CkDsa::ckSaveText(dsa,pemStr,"dsa_priv.xml")

    Debug "Finished!"


    CkDsa::ckDispose(dsa)


    ProcedureReturn
EndProcedure