C++

RSA-OAEP with SHA256 hashing

See more RSA Examples

RSA encrypt a SHA256 hash with OAEP padding. C++

#include <CkPublicKey.h>
#include <CkStringBuilder.h>
#include <CkJsonObject.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;
    }

    //  Build a small string to encrypt
    CkJsonObject json;
    json.UpdateString("example","123");
    json.UpdateString("hello","world");
    std::cout << json.emit() << "\r\n";

    //  This is the JSON to be RSA encrypted:  {"example":"123","hello":"world"}

    //  IMPORTANT: RSA encryption is only used to encrypt small amounts of data.
    //  RSA is only able to encrypt data to a maximum amount of your key size (2048 bits = 256 bytes) 
    //  minus padding / header data (11 bytes for PKCS#1 v1.5 padding, 42 bytes for OAEP).
    //  As a result it is often not possible to encrypt files with RSA directly. 
    //  RSA is also not meant for this purpose. 
    //  
    //  If you want to encrypt more data, you can use something like:
    //  1) Generate a 256-bit random keystring K
    //  2) Encrypt your data with AES-CBC with K
    //  3) Encrypt K with RSA
    //  4) Send both to the other side 

    CkRsa rsa;
    rsa.put_PkcsPadding(false);
    rsa.put_OaepHash("SHA-256");
    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.encryptStringENC(json.emit(),bUsePrivateKey);
    if (rsa.get_LastMethodSuccess() == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Result: " << encryptedStr << "\r\n";
    }