PureBasic

Export a Private Key as DER into a BinData

Demonstrates the Chilkat PrivateKey.GetPkcsBd method, which exports the key as DER into a BinData. The first argument selects PKCS #1 (true) versus PKCS #8 (false), the second is the password (empty for unencrypted), and the third is the BinData that receives the bytes.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is the in-memory binary export — the raw DER bytes land in a BinData ready to hash, encrypt, or hand to another API without a temporary file. One method covers several cases: the boolean picks the traditional (PKCS #1) versus modern (PKCS #8) structure, and a nonempty password produces an encrypted PKCS #8 export (with the cipher from Pkcs8EncryptAlg). Source any password securely.

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IncludeFile "CkBinData.pb"
IncludeFile "CkPrivateKey.pb"

Procedure ChilkatExample()

    success.i = 0

    ;  Load a private key to export.
    privKey.i = CkPrivateKey::ckCreate()
    If privKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPrivateKey::ckLoadPemFile(privKey,"qa_data/private.pem")
    If success = 0
        Debug CkPrivateKey::ckLastErrorText(privKey)
        CkPrivateKey::ckDispose(privKey)
        ProcedureReturn
    EndIf

    ;  The key password is not hard-coded in a real application; obtain it from an interactive
    ;  prompt, environment variable, or a secrets vault.
    password.s = "myKeyPassword"

    ;  Export the key as DER into a BinData.  The 1st argument selects PKCS #1 (1) versus PKCS #8
    ;  (0); the 2nd is the password (empty string for an unencrypted export); the 3rd is the
    ;  BinData that receives the DER bytes.
    usePkcs1.i = 0
    bd.i = CkBinData::ckCreate()
    If bd.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPrivateKey::ckGetPkcsBd(privKey,usePkcs1,password,bd)
    If success = 0
        Debug CkPrivateKey::ckLastErrorText(privKey)
        CkPrivateKey::ckDispose(privKey)
        CkBinData::ckDispose(bd)
        ProcedureReturn
    EndIf

    Debug "Exported " + Str(CkBinData::ckNumBytes(bd)) + " DER bytes."


    CkPrivateKey::ckDispose(privKey)
    CkBinData::ckDispose(bd)


    ProcedureReturn
EndProcedure