(Lianja) ClickBank Decrypt Instant Notification

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

Chilkat Lianja Extension Download Chilkat Lianja Extension

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

// secret key from your ClickBank account
lcSecretKey = "MY_SECRET_KEY"

lcJsonStr = '{"notification":"BASE64_NOTIFICATION","iv":"BASE64_IV"}'

loJson = createobject("CkJsonObject")
llSuccess = loJson.Load(lcJsonStr)

// Get the encrypted notification (binary) and IV from the JSON.
loBdNotif = createobject("CkBinData")
loBdIv = createobject("CkBinData")

llSuccess = loBdNotif.AppendEncoded(loJson.StringOf("notification"),"base64")
llSuccess = loBdIv.AppendEncoded(loJson.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.

loCrypt = createobject("CkCrypt2")
// Because we're using the hex string as the actual AES key, it matters whether the hex is uppercase or lowercase.
// We want lowercase.
loCrypt.EncodingMode = "hex_lower"
loCrypt.HashAlgorithm = "sha1"
lcHexSha1 = loCrypt.HashStringENC(lcSecretKey)
? lcHexSha1

// Treat the hex string as binary data for the AES key..
loBdKey = createobject("CkBinData")
loBdKey.AppendString(lcHexSha1,"us-ascii")
loBdKey.RemoveChunk(32,8)

loCrypt.KeyLength = 256
loCrypt.CryptAlgorithm = "aes"
loCrypt.CipherMode = "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..
loCrypt.SetEncodedIV(loBdIv.GetEncoded("base64"),"base64")
loCrypt.SetEncodedKey(loBdKey.GetEncoded("base64"),"base64")

loCrypt.DecryptBd(loBdNotif)
? "Decrypted: " + loBdNotif.GetString("utf-8")


release loJson
release loBdNotif
release loBdIv
release loCrypt
release loBdKey