C++

RSASSA-PSS Algorithm with SHA256 Hashing

See more RSA Examples

RSA encrypt a SHA256 hash with OAEP padding. 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.

    CkPrivateKey privkey;

    // Load the private key object from a PEM file.
    // (To load from a PEM string, call LoadPem instead.)
    success = privkey.LoadPemFile("somePath/myPrivateKey.pem");
    if (success == false) {
        std::cout << privkey.lastErrorText() << "\r\n";
        return;
    }

    CkRsa rsa;
    // Use RSA-PSS by setting PkcsPadding = false
    rsa.put_PkcsPadding(false);
    // Use SHA256
    rsa.put_OaepHash("SHA-256");

    rsa.UsePrivateKey(privkey);

    // Generate a base64 signature.
    rsa.put_EncodingMode("base64");

    const char *sigStr = rsa.signStringENC("String to be signed","SHA-256");
    if (rsa.get_LastMethodSuccess() == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Signature: " << sigStr << "\r\n";
    }