Unicode C

Generate a Random 256-bit AES Key and RSA Encrypt

See more RSA Examples

Generates a random 256-bit AES key and encrypts using an RSA public key. Only the owner of the RSA private key will be able to decrypt the AES key. Unicode C

#include <C_CkPublicKeyW.h>
#include <C_CkRsaW.h>
#include <C_CkBinDataW.h>
#include <C_CkPrngW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkPublicKeyW pubKey;
    HCkRsaW rsa;
    HCkBinDataW bdAesKey;
    HCkPrngW prng;

    success = FALSE;

    // The RSA public key is used for encryption, and the private key for decryption.

    // The public key's role is to make encryption accessible to anyone while ensuring that
    // only the private key holder can decrypt the messages.
    // The public key is designed to be widely distributed so anyone can use it to encrypt messages
    // intended for the owner of the private key.

    // Load our 2048-bit RSA public key.
    pubKey = CkPublicKeyW_Create();
    // In all Chilkat methods expecting a path, you pass either absolute or relative paths.
    success = CkPublicKeyW_LoadFromFile(pubKey,L"rsaKeys/Test2048Rsa.pem");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPublicKeyW_lastErrorText(pubKey));
        CkPublicKeyW_Dispose(pubKey);
        return;
    }

    rsa = CkRsaW_Create();

    // Tell RSA to use the public key.
    CkRsaW_UsePublicKey(rsa,pubKey);

    // Generate a random 256-bit AES key (32 bytes)
    bdAesKey = CkBinDataW_Create();
    prng = CkPrngW_Create();
    CkPrngW_GenRandomBd(prng,32,bdAesKey);

    // RSA encrypt.
    CkRsaW_EncryptBd(rsa,bdAesKey,FALSE);

    // Save the RSA encrypted AES key to a file.
    success = CkBinDataW_WriteFile(bdAesKey,L"rsaEncrypted/myAes.key");


    CkPublicKeyW_Dispose(pubKey);
    CkRsaW_Dispose(rsa);
    CkBinDataW_Dispose(bdAesKey);
    CkPrngW_Dispose(prng);

    }