Unicode C

RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

See more RSA Examples

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

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

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

    success = FALSE;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    rsa = CkRsaW_Create();

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

    // Get the default private key.

    privKey = CkPrivateKeyW_Create();
    success = CkPfxW_PrivateKeyAt(pfx,0,privKey);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPfxW_lastErrorText(pfx));
        CkRsaW_Dispose(rsa);
        CkPfxW_Dispose(pfx);
        CkPrivateKeyW_Dispose(privKey);
        return;
    }

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

    // Get the signature in base64
    CkRsaW_putEncodingMode(rsa,L"base64");

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

    // Sign the string using the sha256 hash algorithm.
    // Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
    base64Sig = CkRsaW_signStringENC(rsa,strData,L"sha256");

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

    wprintf(L"Success!\n");


    CkRsaW_Dispose(rsa);
    CkPfxW_Dispose(pfx);
    CkPrivateKeyW_Dispose(privKey);

    }