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(C++) Convert PuTTY Private Key (ppk) to OpenSSH (pem)

Convert a PuTTY format private key file (.ppk) to OpenSSH (.pem).

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#include <CkSshKey.h>

void ChilkatSample(void)
    {
    CkSshKey key;

    bool success;

    //  Load an unencrypted or encrypted PuTTY private key.

    //  If  your PuTTY private key is encrypted, set the Password
    //  property before calling FromPuttyPrivateKey.
    //  If your PuTTY private key is not encrypted, it makes no diffference
    //  if Password is set or not set.
    key.put_Password("secret");

    //  First load the .ppk file into a string:
    const char *keyStr = 0;
    keyStr = key.loadText("putty_private_key.ppk");

    //  Import into the SSH key object:
    success = key.FromPuttyPrivateKey(keyStr);
    if (success != true) {
        std::cout << key.lastErrorText() << "\r\n";
        return;
    }

    //  Convert to an encrypted or unencrypted OpenSSH key.

    //  First demonstrate converting to an unencrypted OpenSSH key
    const char *unencryptedKeyStr = 0;
    bool bEncrypt = false;
    unencryptedKeyStr = key.toOpenSshPrivateKey(bEncrypt);
    success = key.SaveText(unencryptedKeyStr,"unencrypted_openssh.pem");
    if (success != true) {
        std::cout << key.lastErrorText() << "\r\n";
        return;
    }

    //  Save to an encrypted OpenSSH PEM file:
    const char *encryptedKeyStr = 0;
    bEncrypt = true;
    key.put_Password("myPassword");
    encryptedKeyStr = key.toOpenSshPrivateKey(bEncrypt);
    success = key.SaveText(encryptedKeyStr,"encrypted_openssh.pem");
    if (success != true) {
        std::cout << key.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Done!" << "\r\n";

    }

 

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