(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 <C_CkJsonObjectW.h>
#include <C_CkBinDataW.h>
#include <C_CkCrypt2W.h>

void ChilkatSample(void)
    {
    const wchar_t *secretKey;
    const wchar_t *jsonStr;
    HCkJsonObjectW json;
    BOOL success;
    HCkBinDataW bdNotif;
    HCkBinDataW bdIv;
    HCkCrypt2W crypt;
    const wchar_t *hexSha1;
    HCkBinDataW bdKey;

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

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

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

    json = CkJsonObjectW_Create();
    success = CkJsonObjectW_Load(json,jsonStr);

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

    success = CkBinDataW_AppendEncoded(bdNotif,CkJsonObjectW_stringOf(json,L"notification"),L"base64");
    success = CkBinDataW_AppendEncoded(bdIv,CkJsonObjectW_stringOf(json,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.

    crypt = CkCrypt2W_Create();
    // Because we're using the hex string as the actual AES key, it matters whether the hex is uppercase or lowercase.
    // We want lowercase.
    CkCrypt2W_putEncodingMode(crypt,L"hex_lower");
    CkCrypt2W_putHashAlgorithm(crypt,L"sha1");
    hexSha1 = CkCrypt2W_hashStringENC(crypt,secretKey);
    wprintf(L"%s\n",hexSha1);

    // Treat the hex string as binary data for the AES key..
    bdKey = CkBinDataW_Create();
    CkBinDataW_AppendString(bdKey,hexSha1,L"us-ascii");
    CkBinDataW_RemoveChunk(bdKey,32,8);

    CkCrypt2W_putKeyLength(crypt,256);
    CkCrypt2W_putCryptAlgorithm(crypt,L"aes");
    CkCrypt2W_putCipherMode(crypt,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..
    CkCrypt2W_SetEncodedIV(crypt,CkBinDataW_getEncoded(bdIv,L"base64"),L"base64");
    CkCrypt2W_SetEncodedKey(crypt,CkBinDataW_getEncoded(bdKey,L"base64"),L"base64");

    CkCrypt2W_DecryptBd(crypt,bdNotif);
    wprintf(L"Decrypted: %s\n",CkBinDataW_getString(bdNotif,L"utf-8"));


    CkJsonObjectW_Dispose(json);
    CkBinDataW_Dispose(bdNotif);
    CkBinDataW_Dispose(bdIv);
    CkCrypt2W_Dispose(crypt);
    CkBinDataW_Dispose(bdKey);

    }