Xbase++

Blowfish OFB Output Feedback Mode Encryption

See more Encryption Examples

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

LOCAL oCrypt
LOCAL cIvHex
LOCAL cKeyHex
LOCAL cEncStr
LOCAL oDecrypt
LOCAL cDecStr

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

oCrypt := CreateObject("Chilkat.Crypt2")

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

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

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

//  Encrypt a string...
cEncStr := oCrypt:EncryptStringENC("Emergencies have always been the pretext on which the safeguards of individual liberty have been eroded. -- Friedrich Hayek")
? cEncStr

oDecrypt := CreateObject("Chilkat.Crypt2")
oDecrypt:CryptAlgorithm := "blowfish2"
oDecrypt:CipherMode := "ofb"
oDecrypt:KeyLength := 256
oDecrypt:EncodingMode := "hex"
oDecrypt:SetEncodedIV(cIvHex, "hex")
oDecrypt:SetEncodedKey(cKeyHex, "hex")

//  Now decrypt:
cDecStr := oDecrypt:DecryptStringENC(cEncStr)
? cDecStr

oCrypt:destroy()
oDecrypt:destroy()