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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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llSuccess = .F.

//  Load a private key to export.
loPrivKey = createobject("CkPrivateKey")
llSuccess = loPrivKey.LoadPemFile("qa_data/private.pem")
if (llSuccess = .F.) then
    ? loPrivKey.LastErrorText
    release loPrivKey
    return
endif

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

//  Export the key as DER into a BinData.  The 1st argument selects PKCS #1 (.T.) versus PKCS #8
//  (.F.); the 2nd is the password (empty string for an unencrypted export); the 3rd is the
//  BinData that receives the DER bytes.
llUsePkcs1 = .F.
loBd = createobject("CkBinData")
llSuccess = loPrivKey.GetPkcsBd(llUsePkcs1,lcPassword,loBd)
if (llSuccess = .F.) then
    ? loPrivKey.LastErrorText
    release loPrivKey
    release loBd
    return
endif

? "Exported " + str(loBd.NumBytes) + " DER bytes."


release loPrivKey
release loBd