(PureBasic) DSA Generate Key

Generates a DSA public/private key pair and saves to PEM and DER file formats (both encrypted and non-encrypted).

An encrypted DSA PEM looks like this:

-----BEGIN DSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,9DAFD5C4CD62A5D0

QwDdp66sB0qKXQli7FbVcKL/eo3wu7kGRlV2sI8XbkNa1RTLiwnwTWDB0dqyWRQ8
...
Bx0HVfxKiNgCbL6BQEnYD+GOmMcckuj9Uhgloe/YuXCIDJBGhjUt/li3hvR/PXeC

V2xxNl1XKBE88njqi+UXt4vjGVNLpvXM
-----END DSA PRIVATE KEY-----

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

    ; Call GenKey to generate a new DSA key.
    ; The number of bits should be at least 1024 and a multiple
    ; of 64.   Typical values are either 1024 or 2048.
    ; DSA key generation is compute intensive and may take
    ; a short while to complete.
    success.i = CkDsa::ckGenKey(dsa,2048)
    If success <> 1
        Debug CkDsa::ckLastErrorText(dsa)
        CkDsa::ckDispose(dsa)
        ProcedureReturn
    EndIf

    ; Extract the private and public parts to PEM or DER format
    ; and save to 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,xmlStr,"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,xmlStr,"dsa_priv.xml")

    Debug "Finished!"


    CkDsa::ckDispose(dsa)


    ProcedureReturn
EndProcedure