Ruby

Blowfish OFB Output Feedback Mode Encryption

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

require 'chilkat'

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

crypt = Chilkat::CkCrypt2.new()

# Use "blowfish2" to produce correct results that match published blowfish test vectors.
crypt.put_CryptAlgorithm("blowfish2")
# Set the cipher mode to Output Feedback
crypt.put_CipherMode("ofb")
crypt.put_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.put_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")
print encStr + "\n";

decrypt = Chilkat::CkCrypt2.new()
decrypt.put_CryptAlgorithm("blowfish2")
decrypt.put_CipherMode("ofb")
decrypt.put_KeyLength(256)
decrypt.put_EncodingMode("hex")
decrypt.SetEncodedIV(ivHex,"hex")
decrypt.SetEncodedKey(keyHex,"hex")

# Now decrypt:
decStr = decrypt.decryptStringENC(encStr)
print decStr + "\n";