Xbase++

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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LOCAL nSuccess
LOCAL oPrivKey
LOCAL cPassword
LOCAL nUsePkcs1
LOCAL oBd

nSuccess := 0

//  Load a private key to export.
oPrivKey := CreateObject("Chilkat.PrivateKey")
nSuccess := oPrivKey:LoadPemFile("qa_data/private.pem")
IF (nSuccess == 0)
    ? oPrivKey:LastErrorText
    oPrivKey:destroy()
    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.
cPassword := "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.
nUsePkcs1 := 0
oBd := CreateObject("Chilkat.BinData")
nSuccess := oPrivKey:GetPkcsBd(nUsePkcs1, cPassword, oBd)
IF (nSuccess == 0)
    ? oPrivKey:LastErrorText
    oPrivKey:destroy()
    oBd:destroy()
    RETURN
ENDIF

? "Exported " + Str(oBd:NumBytes) + " DER bytes."

oPrivKey:destroy()
oBd:destroy()