(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.

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

void ChilkatSample(void)
    {
    // 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) {
        std::cout << privKey.lastErrorText() << "\r\n";
        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");
    std::cout << sigBase64 << "\r\n";
    }