(Unicode C++) ClickBank Decrypt Instant Notification

Demonstrates how to decrypt a ClickBank instant notification. See Instant Notification Service for more information and alternative code snippets.

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#include <CkJsonObjectW.h>
#include <CkBinDataW.h>
#include <CkCrypt2W.h>

void ChilkatSample(void)
    {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // secret key from your ClickBank account
    const wchar_t *secretKey = L"MY_SECRET_KEY";

    const wchar_t *jsonStr = L"{\"notification\":\"BASE64_NOTIFICATION\",\"iv\":\"BASE64_IV\"}";

    CkJsonObjectW json;
    bool success = json.Load(jsonStr);

    // Get the encrypted notification (binary) and IV from the JSON.
    CkBinDataW bdNotif;
    CkBinDataW bdIv;

    success = bdNotif.AppendEncoded(json.stringOf(L"notification"),L"base64");
    success = bdIv.AppendEncoded(json.stringOf(L"iv"),L"base64");

    // Get an SHA1 digest (as a hex string) of the secret key.
    // A SHA1 digest is 20 bytes.  Therefore the hex string is 40 chars.
    // Treat each us-ascii char as a binary byte of the secret key.
    // 256-bit AES needs a 256-bit key, which is 32-bytes.  Therefore
    // use the 1st 32 us-ascii chars of the hex SHA1 as the AES secret key.

    CkCrypt2W crypt;
    // Because we're using the hex string as the actual AES key, it matters whether the hex is uppercase or lowercase.
    // We want lowercase.
    crypt.put_EncodingMode(L"hex_lower");
    crypt.put_HashAlgorithm(L"sha1");
    const wchar_t *hexSha1 = crypt.hashStringENC(secretKey);
    wprintf(L"%s\n",hexSha1);

    // Treat the hex string as binary data for the AES key..
    CkBinDataW bdKey;
    bdKey.AppendString(hexSha1,L"us-ascii");
    bdKey.RemoveChunk(32,8);

    crypt.put_KeyLength(256);
    crypt.put_CryptAlgorithm(L"aes");
    crypt.put_CipherMode(L"cbc");

    // We can use any encoding because were just getting the binary bytes in an encoding, and then setting from the same encoding.
    // We'll just use base64..
    crypt.SetEncodedIV(bdIv.getEncoded(L"base64"),L"base64");
    crypt.SetEncodedKey(bdKey.getEncoded(L"base64"),L"base64");

    crypt.DecryptBd(bdNotif);
    wprintf(L"Decrypted: %s\n",bdNotif.getString(L"utf-8"));
    }