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Unicode C Examples

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(Unicode C) RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format.

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#include <C_CkRsaW.h>
#include <C_CkPfxW.h>
#include <C_CkPrivateKeyW.h>

void ChilkatSample(void)
    {
    HCkRsaW rsa;
    BOOL success;
    HCkPfxW pfx;
    HCkPrivateKeyW privKey;
    const wchar_t *strData;
    const wchar_t *base64Sig;

    rsa = CkRsaW_Create();

    //  Any string argument automatically begins the 30-day trial.
    success = CkRsaW_UnlockComponent(rsa,L"30-day trial");
    if (success != TRUE) {
        wprintf(L"%s\n",CkRsaW_lastErrorText(rsa));
        CkRsaW_Dispose(rsa);
        return;
    }

    //  Load the .pfx/.p12
    pfx = CkPfxW_Create();
    success = CkPfxW_LoadPfxFile(pfx,L"qa_data/pfx/myKey.p12",L"myPassword");
    if (success != TRUE) {
        wprintf(L"%s\n",CkPfxW_lastErrorText(pfx));
        CkRsaW_Dispose(rsa);
        CkPfxW_Dispose(pfx);
        return;
    }

    //  Get the default private key.
    privKey = CkPfxW_GetPrivateKey(pfx,0);
    if (CkPfxW_getLastMethodSuccess(pfx) != TRUE) {
        wprintf(L"%s\n",CkPfxW_lastErrorText(pfx));
        CkRsaW_Dispose(rsa);
        CkPfxW_Dispose(pfx);
        return;
    }

    //  Import the private key into the RSA component:
    success = CkRsaW_ImportPrivateKeyObj(rsa,privKey);
    if (success != TRUE) {
        wprintf(L"%s\n",CkRsaW_lastErrorText(rsa));
        CkPrivateKeyW_Dispose(privKey);
        CkRsaW_Dispose(rsa);
        CkPfxW_Dispose(pfx);
        return;
    }

    CkPrivateKeyW_Dispose(privKey);

    //  This example will sign a string, and receive the signature
    //  in a base64-encoded string.  Therefore, set the encoding mode
    //  to "base64":
    CkRsaW_putEncodingMode(rsa,L"base64");

    //  If some other non-Chilkat application or web service is going to be verifying
    //  the signature, it is important to match the byte-ordering.
    //  The LittleEndian property may be set to TRUE
    //  for little-endian byte ordering,
    //  or FALSE  for big-endian byte ordering.
    //  Microsoft apps typically use little-endian, while
    //  OpenSSL and other services (such as Amazon CloudFront)
    //  use big-endian.
    CkRsaW_putLittleEndian(rsa,FALSE);

    strData = L"This is the string to be signed.";

    //  Sign the string using the sha-256 hash algorithm.
    //  Other valid choices are "sha-1", "md2" and "md5".
    base64Sig = CkRsaW_signStringENC(rsa,strData,L"sha-256");

    wprintf(L"%s\n",base64Sig);

    wprintf(L"Success!\n");


    CkRsaW_Dispose(rsa);
    CkPfxW_Dispose(pfx);

    }

 

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