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. C

#include <C_CkRsa.h>
#include <C_CkPfx.h>
#include <C_CkPrivateKey.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkRsa rsa;
    HCkPfx pfx;
    HCkPrivateKey privKey;
    const char *strData;
    const char *base64Sig;

    success = FALSE;

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

    rsa = CkRsa_Create();

    // Load the .pfx/.p12
    pfx = CkPfx_Create();
    success = CkPfx_LoadPfxFile(pfx,"qa_data/pfx/myKey.p12","myPassword");
    if (success == FALSE) {
        printf("%s\n",CkPfx_lastErrorText(pfx));
        CkRsa_Dispose(rsa);
        CkPfx_Dispose(pfx);
        return;
    }

    // Get the default private key.

    privKey = CkPrivateKey_Create();
    success = CkPfx_PrivateKeyAt(pfx,0,privKey);
    if (success == FALSE) {
        printf("%s\n",CkPfx_lastErrorText(pfx));
        CkRsa_Dispose(rsa);
        CkPfx_Dispose(pfx);
        CkPrivateKey_Dispose(privKey);
        return;
    }

    // Import the private key into the RSA component:
    success = CkRsa_UsePrivateKey(rsa,privKey);
    if (success == FALSE) {
        printf("%s\n",CkRsa_lastErrorText(rsa));
        CkRsa_Dispose(rsa);
        CkPfx_Dispose(pfx);
        CkPrivateKey_Dispose(privKey);
        return;
    }

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

    strData = "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 = CkRsa_signStringENC(rsa,strData,"sha256");

    printf("%s\n",base64Sig);

    printf("Success!\n");


    CkRsa_Dispose(rsa);
    CkPfx_Dispose(pfx);
    CkPrivateKey_Dispose(privKey);

    }