(PowerShell) Blowfish OFB Output Feedback Mode Encryption

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

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

$crypt = New-Object Chilkat.Crypt2

# Use "blowfish2" to produce correct results that match published blowfish test vectors.
$crypt.CryptAlgorithm = "blowfish2"
# Set the cipher mode to Output Feedback
$crypt.CipherMode = "ofb"
$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.
$crypt.EncodingMode = "hex"

# The block size of the blowfish algoirthm is 8 bytes, therefore the IV is 8 bytes.
$ivHex = "0001020304050607"
$crypt.SetEncodedIV($ivHex,"hex")

# The secret key must equal the size of the key.  For
# 256-bit encryption, the binary secret key is 32 bytes.
$keyHex = "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"
$crypt.SetEncodedKey($keyHex,"hex")

# Encrypt a string...
$encStr = $crypt.EncryptStringENC("Emergencies have always been the pretext on which the safeguards of individual liberty have been eroded. -- Friedrich Hayek")
$($encStr)

$decrypt = New-Object Chilkat.Crypt2
$decrypt.CryptAlgorithm = "blowfish2"
$decrypt.CipherMode = "ofb"
$decrypt.KeyLength = 256
$decrypt.EncodingMode = "hex"
$decrypt.SetEncodedIV($ivHex,"hex")
$decrypt.SetEncodedKey($keyHex,"hex")

# Now decrypt:
$decStr = $decrypt.DecryptStringENC($encStr)
$($decStr)