Unicode C

RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature. Unicode C

#include <C_CkCertStoreW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkCertW.h>
#include <C_CkPrivateKeyW.h>
#include <C_CkRsaW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCertStoreW certStore;
    HCkJsonObjectW jsonCN;
    HCkCertW cert;
    HCkPrivateKeyW privKey;
    HCkRsaW rsa;
    const wchar_t *strData;
    const wchar_t *hexSig;

    success = FALSE;

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

    // Create an instance of a certificate store object, load a PFX file,
    // locate the certificate we need, and use it for signing.
    // (a PFX file may contain more than one certificate.)
    certStore = CkCertStoreW_Create();

    // The 1st argument is the filename, the 2nd arg is the 
    // PFX file's password:
    success = CkCertStoreW_LoadPfxFile(certStore,L"chilkat.pfx",L"test");
    if (success == FALSE) {
        wprintf(L"%s\n",CkCertStoreW_lastErrorText(certStore));
        CkCertStoreW_Dispose(certStore);
        return;
    }

    // Find the certificate by the subject common name:
    jsonCN = CkJsonObjectW_Create();
    CkJsonObjectW_UpdateString(jsonCN,L"CN",L"cert common name");

    cert = CkCertW_Create();
    success = CkCertStoreW_FindCert(certStore,jsonCN,cert);
    if (success == FALSE) {
        wprintf(L"%s\n",CkCertStoreW_lastErrorText(certStore));
        CkCertStoreW_Dispose(certStore);
        CkJsonObjectW_Dispose(jsonCN);
        CkCertW_Dispose(cert);
        return;
    }

    privKey = CkPrivateKeyW_Create();
    success = CkCertW_GetPrivateKey(cert,privKey);
    if (success == FALSE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkCertStoreW_Dispose(certStore);
        CkJsonObjectW_Dispose(jsonCN);
        CkCertW_Dispose(cert);
        CkPrivateKeyW_Dispose(privKey);
        return;
    }

    rsa = CkRsaW_Create();

    success = CkRsaW_UsePrivateKey(rsa,privKey);
    if (success == FALSE) {
        wprintf(L"%s\n",CkRsaW_lastErrorText(rsa));
        CkCertStoreW_Dispose(certStore);
        CkJsonObjectW_Dispose(jsonCN);
        CkCertW_Dispose(cert);
        CkPrivateKeyW_Dispose(privKey);
        CkRsaW_Dispose(rsa);
        return;
    }

    // Encode the signature as a hex string
    CkRsaW_putEncodingMode(rsa,L"hex");

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

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

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

    wprintf(L"Success!\n");


    CkCertStoreW_Dispose(certStore);
    CkJsonObjectW_Dispose(jsonCN);
    CkCertW_Dispose(cert);
    CkPrivateKeyW_Dispose(privKey);
    CkRsaW_Dispose(rsa);

    }