PowerBuilder

Blowfish OFB Output Feedback Mode Encryption

See more Encryption Examples

Demonstrates how to encrypt using Blowfish OFB (Output Feedback) mode. PowerBuilder

integer li_rc
oleobject loo_Crypt
string ls_IvHex
string ls_KeyHex
string ls_EncStr
oleobject loo_Decrypt
string ls_DecStr

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

loo_Crypt = create oleobject
li_rc = loo_Crypt.ConnectToNewObject("Chilkat.Crypt2")
if li_rc < 0 then
    destroy loo_Crypt
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Use "blowfish2" to produce correct results that match published blowfish test vectors.
loo_Crypt.CryptAlgorithm = "blowfish2"
// Set the cipher mode to Output Feedback
loo_Crypt.CipherMode = "ofb"
loo_Crypt.KeyLength = 256

// EncodingMode specifies the encoding of the output for
// encryption, and the input for decryption.
// It may be "hex", "url", "base64", "quoted-printable", or many other choices.
loo_Crypt.EncodingMode = "hex"

// The block size of the blowfish algoirthm is 8 bytes, therefore the IV is 8 bytes.
ls_IvHex = "0001020304050607"
loo_Crypt.SetEncodedIV(ls_IvHex,"hex")

// The secret key must equal the size of the key.  For
// 256-bit encryption, the binary secret key is 32 bytes.
ls_KeyHex = "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"
loo_Crypt.SetEncodedKey(ls_KeyHex,"hex")

// Encrypt a string...
ls_EncStr = loo_Crypt.EncryptStringENC("Emergencies have always been the pretext on which the safeguards of individual liberty have been eroded. -- Friedrich Hayek")
Write-Debug ls_EncStr

loo_Decrypt = create oleobject
li_rc = loo_Decrypt.ConnectToNewObject("Chilkat.Crypt2")

loo_Decrypt.CryptAlgorithm = "blowfish2"
loo_Decrypt.CipherMode = "ofb"
loo_Decrypt.KeyLength = 256
loo_Decrypt.EncodingMode = "hex"
loo_Decrypt.SetEncodedIV(ls_IvHex,"hex")
loo_Decrypt.SetEncodedKey(ls_KeyHex,"hex")

// Now decrypt:
ls_DecStr = loo_Decrypt.DecryptStringENC(ls_EncStr)
Write-Debug ls_DecStr


destroy loo_Crypt
destroy loo_Decrypt