Export an Encrypted PKCS #8 Private Key as Encoded Text

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Demonstrates the Chilkat PrivateKey.GetPkcs8EncryptedENC method, which exports the key as password-protected PKCS #8 DER and encodes the encrypted DER as text. The first argument names the binary encoding and the second is the password. The cipher is selected by Pkcs8EncryptAlg.

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 combines encryption with text encoding: the key is protected by a passphrase and returned as a string, ideal for storing an encrypted key in a text-only medium such as JSON or an environment variable. It is the encrypted counterpart to GetPkcs8ENC. Source the password securely.

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#include <C_CkPrivateKey.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkPrivateKey privKey;
    const char *password;
    const char *encoded;

    success = FALSE;

    //  Load a private key to export.
    privKey = CkPrivateKey_Create();
    success = CkPrivateKey_LoadPemFile(privKey,"qa_data/private.pem");
    if (success == FALSE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        CkPrivateKey_Dispose(privKey);
        return;
    }

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

    //  Export as password-protected PKCS #8 DER, then encode the encrypted DER as text.  The 1st
    //  argument names the binary encoding and the 2nd is the password.  The cipher is selected by the
    //  Pkcs8EncryptAlg property.
    encoded = CkPrivateKey_getPkcs8EncryptedENC(privKey,"base64",password);
    if (CkPrivateKey_getLastMethodSuccess(privKey) == FALSE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        CkPrivateKey_Dispose(privKey);
        return;
    }

    printf("%s\n",encoded);


    CkPrivateKey_Dispose(privKey);

    }