(Go) ClickBank Decrypt Instant Notification

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

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

    // 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 := "MY_SECRET_KEY"

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

    json := chilkat.NewJsonObject()
    success := json.Load(jsonStr)

    // Get the encrypted notification (binary) and IV from the JSON.
    bdNotif := chilkat.NewBinData()
    bdIv := chilkat.NewBinData()

    success = bdNotif.AppendEncoded(*json.StringOf("notification"),"base64")
    success = bdIv.AppendEncoded(*json.StringOf("iv"),"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 := chilkat.NewCrypt2()
    // 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.SetEncodingMode("hex_lower")
    crypt.SetHashAlgorithm("sha1")
    hexSha1 := crypt.HashStringENC(secretKey)
    fmt.Println(*hexSha1)

    // Treat the hex string as binary data for the AES key..
    bdKey := chilkat.NewBinData()
    bdKey.AppendString(*hexSha1,"us-ascii")
    bdKey.RemoveChunk(32,8)

    crypt.SetKeyLength(256)
    crypt.SetCryptAlgorithm("aes")
    crypt.SetCipherMode("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("base64"),"base64")
    crypt.SetEncodedKey(*bdKey.GetEncoded("base64"),"base64")

    crypt.DecryptBd(bdNotif)
    fmt.Println("Decrypted: ", *bdNotif.GetString("utf-8"))

    json.DisposeJsonObject()
    bdNotif.DisposeBinData()
    bdIv.DisposeBinData()
    crypt.DisposeCrypt2()
    bdKey.DisposeBinData()