PureBasic

Load a Private Key from BinData (Any Format)

Demonstrates the Chilkat PrivateKey.LoadAnyFormat method, which loads a private key by inspecting the bytes in a BinData. The first argument is the BinData and the second is the password (used if the detected key is encrypted).

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own key file.

Background: When you have key bytes in memory but do not know their exact format — downloaded, decrypted, or pulled from a database — this figures it out for you, recognizing PKCS #1/#8 DER, encrypted PKCS #8, PEM, JWK, Chilkat XML, Microsoft formats, and more. It removes the guesswork of choosing a specific loader, at the small cost of the detection step. Supply the password so it can decrypt an encrypted key without a second call.

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

Procedure ChilkatExample()

    success.i = 0

    ;  Demonstrates the PrivateKey.LoadAnyFormat method, which loads a private key by inspecting the
    ;  bytes in a BinData.  The 1st argument is the BinData and the 2nd is the password (used if the
    ;  detected key is encrypted).

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

    success = CkBinData::ckLoadFile(bd,"qa_data/some_private_key")
    If success = 0
        Debug CkBinData::ckLastErrorText(bd)
        CkBinData::ckDispose(bd)
        ProcedureReturn
    EndIf

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

    ;  Chilkat auto-detects the representation: PKCS #1/#8 DER, encrypted PKCS #8, PEM, JWK,
    ;  Chilkat XML, Microsoft formats, and more.
    success = CkPrivateKey::ckLoadAnyFormat(privKey,bd,password)
    If success = 0
        Debug CkPrivateKey::ckLastErrorText(privKey)
        CkBinData::ckDispose(bd)
        CkPrivateKey::ckDispose(privKey)
        ProcedureReturn
    EndIf

    Debug "Loaded a " + CkPrivateKey::ckKeyType(privKey) + " private key."


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


    ProcedureReturn
EndProcedure