Save a Private Key as a PKCS #8 DER File

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Demonstrates the Chilkat PrivateKey.SavePkcs8File method, which saves the key as unencrypted PKCS #8 DER to a file. The only argument is the destination path.

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: The file-writing counterpart to GetPkcs8ENC/GetPkcs8Pem, producing a compact binary .der in the algorithm-independent PKCS #8 container. Because it is unencrypted, the file itself is the only protection for the key — store it with restrictive permissions, or use SavePkcs8EncryptedFile to add a passphrase.

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#include <C_CkPrivateKey.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkPrivateKey privKey;

    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;
    }

    //  Save as unencrypted PKCS #8 DER.
    success = CkPrivateKey_SavePkcs8File(privKey,"qa_output/private_pkcs8.der");
    if (success == FALSE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        CkPrivateKey_Dispose(privKey);
        return;
    }

    printf("Saved.\n");


    CkPrivateKey_Dispose(privKey);

    }