Using RSA key with chilkat API in C

Question

I tried to use the RSA key from my .ssh directory using chilkat API in C but failed.
Does anyone have such experience?

Here is what I did so far:

#include <stdio.h>
#include "/home/germaneau/opt/chilkat/chilkat-9.5.0-x86-linux-gcc/include/C_CkSsh.h"
#include "/home/germaneau/opt/chilkat/chilkat-9.5.0-x86-linux-gcc/include/C_CkFtp2.h"
#include "/home/germaneau/opt/chilkat/chilkat-9.5.0-x86-linux-gcc/include/C_CkSshKey.h"

void testFtp2Create(void)
    {
    HCkFtp2 ftp;
    BOOL success;

    ftp = CkFtp2_Create();

    //  Any string unlocks the component for the 1st 30-days.
    success = CkFtp2_UnlockComponent(ftp,"Anything for 30-day trial");
    if (success != TRUE) {
        printf("%s\n",CkFtp2_lastErrorText(ftp));
    }

    CkFtp2_Dispose(ftp);
    }


void SSHSample(void)
    {
    HCkSsh ssh;
    BOOL success;
    const char * hostname;
    long port;
    long channelNum;
    const char * cmdOutput;
    HCkString privKey;
    HCkSshKey key;

    //  Important: It is helpful to send the contents of the
    //  ssh.LastErrorText property when requesting support.

    ssh = CkSsh_Create();
    key = CkSshKey_Create();

    //  Any string automatically begins a fully-functional 30-day trial.

    success = CkSsh_UnlockComponent(ssh,"Anything for 30-day trial");
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        return;
    }

    //  Connect to an SSH server:

    //  Hostname may be an IP address or hostname:
    hostname = "202.120.32.202";
    port = 22;

    success = CkSsh_Connect(ssh,hostname,port);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        return;
    }

    //  Wait a max of 5 seconds when reading responses..
    CkSsh_putIdleTimeoutMs(ssh,5000);

    // load RSA key
    success = CkSshKey_LoadText(key,"/home/germaneau/.ssh/id_rsa",privKey);
    if (CkSshKey_getIsPrivateKey(key)) printf("PrivateKey\n");
    if (CkSshKey_getIsRsaKey(key)) printf("RsaKey\n");

    //  Authenticate using login/privkey:
    success = CkSsh_AuthenticatePk(ssh,"eric",key);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        return;
    }

    //  Open a session channel.  (It is possible to have multiple
    //  session channels open simultaneously.)

    channelNum = CkSsh_OpenSessionChannel(ssh);
    if (channelNum < 0) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        return;
    }

    //  In this example, we'll copy wine.html to wine2.html
    //  The "cp" command has no output (i.e. nothing is written to
    //  the standard output) so we'll include an "echo FINISHED"
    //  so we can programmatically retrieve the output and close
    //  the channel.  Closing the channel immediately after sending
    //  the command is not good because w/ some SSH servers
    //  it introduces a race condition where the command may not
    //  be executed if the server thinks the client has disconnected.
    success = CkSsh_SendReqExec(ssh,channelNum,"echo STARTED && hostname && echo FINISHED");
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        return;
    }

    //  Read the channel until we receive the FINISHED string.
    success = CkSsh_ChannelReceiveUntilMatch(ssh,channelNum,"FINISHED","ansi",TRUE);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        return;
    }

    //  Close the channel:
    success = CkSsh_ChannelSendClose(ssh,channelNum);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        return;
    }

    //  Let's pickup the accumulated output of the command:
    //  (In this case, it will be the string "FINISHED")

    cmdOutput = CkSsh_getReceivedText(ssh,channelNum,"ansi");
    if (cmdOutput == 0 ) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        return;
    }

    //  Display the remote shell's command output:
    printf("%s\n",cmdOutput);

    //  Disconnect
    CkSsh_Disconnect(ssh);

    CkSsh_Dispose(ssh);

    }


int main(int argc, char *argv[])
{
        printf("FTP\n");
    testFtp2Create();
        printf("OK\n");
        printf("SSH\n");        
    SSHSample();
        printf("OK\n"); 
    return 0;
}

And here is the output I get:

FTP
OK
SSH
RsaKey
ChilkatLog:
  AuthenticatePk:
    DllDate: Mar  7 2014
    ChilkatVersion: 9.5.0.17
    UnlockPrefix: Anything for 30-day trial
    Architecture: Little Endian; 32-bit
    Language: Linux C/C++
    VerboseLogging: 0
    SshVersion: SSH-2.0-OpenSSH_5.3
    The SSH key object did not contain a loaded private key.
    Failed.
  --AuthenticatePk
--ChilkatLog

OK

I just don't understand why I get the message

• The SSH key object did not contain a loaded private key.

Thanks for your help.