(MFC) RSA Signature SHA256withRSA, iso-8859-1, base64

See more RSA Examples

RSA sign the iso-8859-1 byte representation of a string with SHA256withRSA, and return the signature in the base64 encoding.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkPrivateKey.h>
#include <CkRsa.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    // This example will duplicate the following Java code:
    // 
    // Signature sign = Signature.getInstance("SHA256withRSA");
    // sign.initSign(privateKey);
    // sign.update(original.getBytes(Charset.forName("ISO-8859-1")));
    // 
    // ...
    // byte[] resultado = sign.sign();
    // sello = encodeByteArrayToBase64(resultado);
    // 

    // Load an RSA private key for signing.
    // You can load any format file.  This example loads a .pem, but you can provide path to any type of file holding a private key.
    CkPrivateKey privKey;
    bool success = privKey.LoadAnyFormatFile("qa_data/pem/rsa_passwd.pem","passwd");
    if (success != true) {
        strOut.append(privKey.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkRsa rsa;
    rsa.ImportPrivateKeyObj(privKey);

    const char *originalData = "This is the string to be hashed an RSA signed.";

    // Indicate that we want the iso-8859-1 byte representation of the string to be signed
    rsa.put_Charset("iso-8859-1");

    // We want the RSA signature in base64 format
    rsa.put_EncodingMode("base64");

    const char *sigBase64 = rsa.signStringENC(originalData,"sha256");
    strOut.append(sigBase64);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }