(PowerBuilder) AES XTS Mode

Demonstrates the AES-XTS mode of operation.

Note: This example requires Chilkat v9.5.0.91 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
integer li_Success
string ls_Key
string ls_TweakKey
string ls_DataUnit
oleobject loo_Bd
oleobject loo_Crypt

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

// Here we have a sample from CAVS validatition data:

// COUNT = 301
// DataUnitLen = 200
// Key = 
// 394c97881abd989d29c703e48a72b397
// a7acf51b59649eeea9b33274d8541df4
// i = 4b15c684a152d485fe9937d39b168c29
// PT = 2f3b9dcfbae729583b1d1ffdd16bb6fe2757329435662a78f0
// CT = f3473802e38a3ffef4d4fb8e6aa266ebde553a64528a06463e

// Note: The above sample requires an AES-XTS implementation that fully supports ciphertext-stealing
// because the data to be encrypted is not an even multiple of the AES block size (i.e. not a multiple of 16 bytes).
// Chilkat fully supports AES-XTS with ciphertext stealing.
// (i.e. Chilkat implements XEX-based tweaked-codebook mode with ciphertext stealing (XTS))

ls_Key = "394c97881abd989d29c703e48a72b397"
ls_TweakKey = "a7acf51b59649eeea9b33274d8541df4"
ls_DataUnit = "4b15c684a152d485fe9937d39b168c29"

loo_Bd = create oleobject
// Use "Chilkat_9_5_0.BinData" for versions of Chilkat < 10.0.0
li_rc = loo_Bd.ConnectToNewObject("Chilkat.BinData")
if li_rc < 0 then
    destroy loo_Bd
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_Bd.AppendEncoded("2f3b9dcfbae729583b1d1ffdd16bb6fe2757329435662a78f0","hex")

loo_Crypt = create oleobject
// Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
li_rc = loo_Crypt.ConnectToNewObject("Chilkat.Crypt2")

loo_Crypt.CryptAlgorithm = "aes"
loo_Crypt.CipherMode = "xts"
loo_Crypt.KeyLength = 128

loo_Crypt.SetEncodedKey(ls_Key,"hex")
loo_Crypt.XtsSetEncodedTweakKey(ls_TweakKey,"hex")
loo_Crypt.XtsSetEncodedTweakValue(ls_DataUnit,"hex")

// In-place encrypt the contents of bd.
li_Success = loo_Crypt.EncryptBd(loo_Bd)

Write-Debug "CT = " + loo_Bd.GetEncoded("hexlower")

// Decrypt to revert back to the unencrypted content:
li_Success = loo_Crypt.DecryptBd(loo_Bd)

Write-Debug "PT = " + loo_Bd.GetEncoded("hexlower")

// Output:
// CT = f3473802e38a3ffef4d4fb8e6aa266ebde553a64528a06463e
// PT = 2f3b9dcfbae729583b1d1ffdd16bb6fe2757329435662a78f0


destroy loo_Bd
destroy loo_Crypt