(C++) RSA Encrypt with SHA-256 hash function and SHA-256 mask function

How can this Javascript be duplicated using Chilkat?

function a(e, t) {
                var r = s.pki.publicKeyFromPem(e)
                  , n = r.encrypt(t, "RSA-OAEP", {
                    md: s.md.sha256.create(),
                    mgf1: {
                        md: s.md.sha1.create()
                    }
                });
                return s.util.encode64(n)
            }

Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens, even using the same data and key, the result will be different -- but still valid. One should not expect to get the same output.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat C/C++ Library Downloads
MS Visual C/C++ C++ Builder Linux C/C++ Alpine Linux C/C++	MacOS C/C++ iOS C/C++ Android C/C++ MinGW C/C++

#include <CkPublicKey.h>
#include <CkStringBuilder.h>
#include <CkCrypt2.h>
#include <CkByteData.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.

    CkPublicKey pubkey;

    CkStringBuilder sbPem;
    bool bCrlf = true;
    sbPem.AppendLine("-----BEGIN PUBLIC KEY-----",bCrlf);
    sbPem.AppendLine("MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF",bCrlf);
    sbPem.AppendLine("3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA",bCrlf);
    sbPem.AppendLine("04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s",bCrlf);
    sbPem.AppendLine("Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF",bCrlf);
    sbPem.AppendLine("wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE",bCrlf);
    sbPem.AppendLine("f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W",bCrlf);
    sbPem.AppendLine("SwIDAQAB",bCrlf);
    sbPem.AppendLine("-----END PUBLIC KEY-----",bCrlf);

    // Load the public key object from the PEM. 
    success = pubkey.LoadFromString(sbPem.getAsString());
    if (success == false) {
        std::cout << pubkey.lastErrorText() << "\r\n";
        return;
    }

    const char *originalData = "This is the original data to be SHA-256 hashed and RSA encrypted.";

    // First we SHA-256 hash the original data.
    CkCrypt2 crypt;
    crypt.put_HashAlgorithm("SHA-256");
    CkByteData hashBytes;
    success = crypt.HashString(originalData,hashBytes);

    // Now to RSA encrypt using OAEP padding with SHA-256 for the mask function.
    CkRsa rsa;
    rsa.put_PkcsPadding(false);
    rsa.put_OaepHash("SHA256");
    rsa.UsePublicKey(pubkey);
    rsa.put_EncodingMode("base64");

    // Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens,
    // even using the same data and key, the result will be different --  but still valid.  One should not expect
    // to get the same output.
    bool bUsePrivateKey = false;
    const char *encryptedStr = rsa.encryptBytesENC(hashBytes,bUsePrivateKey);
    if (rsa.get_LastMethodSuccess() == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Base64 RSA encrypted output: " << encryptedStr << "\r\n";
    }