C++

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. C++

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

void ChilkatSample(void)
    {
    bool success = false;

    //  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;
    success = privKey.LoadAnyFormatFile("qa_data/pem/rsa_passwd.pem","passwd");
    if (success == false) {
        std::cout << privKey.lastErrorText() << "\r\n";
        return;
    }

    CkRsa rsa;
    rsa.UsePrivateKey(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");
    std::cout << sigBase64 << "\r\n";
    }