(PureBasic) Generate an RSA Key and Get as Base64 DER

Demonstrates how to generate a 2048-bit RSA key and return the public and private parts as unencrypted Base64 encoded DER.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkPublicKey.pb"
IncludeFile "CkPrivateKey.pb"
IncludeFile "CkRsa.pb"

Procedure ChilkatExample()

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

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

    ; Generate a 2048-bit key.  Chilkat RSA supports
    success.i = CkRsa::ckGenerateKey(rsa,2048)
    If success <> 1
        Debug CkRsa::ckLastErrorText(rsa)
        CkRsa::ckDispose(rsa)
        ProcedureReturn
    EndIf

    ; Get the public part of the key.
    pubKey.i = CkRsa::ckExportPublicKeyObj(rsa)

    ; There are two possible formats for representing the RSA public key 
    ; in ASN.1 (DER).  The possible formats are PKCS1 and PKCS8.
    ; We can get either by setting bChoosePkcs1 to 1 or 0.
    bChoosePkcs1.i = 1
    pubKeyBase64Der.s = CkPublicKey::ckGetEncoded(pubKey,bChoosePkcs1,"base64")
    Debug "Public Key Base64 DER:"
    Debug pubKeyBase64Der

    CkPublicKey::ckDispose(pubKey)

    ; Now get the private key as Base64 DER:
    ; Get the private part of the key.
    ; (Note: A public key is actually just a subset of the private key.  
    ;  If you have the private key, you also have the public key.
    ;  Thus Chilkat provides a method to get the public key from the private key.)
    privKey.i = CkRsa::ckExportPrivateKeyObj(rsa)

    ; Again, we can get PKCS1 or PKCS8, but with different methods:
    privKeyPkcs1.s = CkPrivateKey::ckGetPkcs1ENC(privKey,"base64")
    Debug "Private Key PKCS1 Base64 DER:"
    Debug privKeyPkcs1

    privKeyPkcs8.s = CkPrivateKey::ckGetPkcs8ENC(privKey,"base64")
    Debug "Private Key PKCS8 Base64 DER:"
    Debug privKeyPkcs8

    CkPrivateKey::ckDispose(privKey)



    CkRsa::ckDispose(rsa)


    ProcedureReturn
EndProcedure