VB.NET

Blowfish Encryption to Match PHP's Mcrypt Extension

See more Encryption Examples

Demonstrates how to match Blowfish encryption results with PHP's mcrypt extension.

Please refer to this PHP (non-Chilkat) example for PHP Blowfish Encryption. The code here matches the PHP mcrypt results on that web page.

VB.NET

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

Dim crypt As New Chilkat.Crypt2

' Use "blowfish2" to get proper results:
crypt.CryptAlgorithm = "blowfish2"

' CipherMode may be "ecb" or "cbc"
crypt.CipherMode = "cbc"

' KeyLength (in bits) may be a number between 32 and 448.
' 128-bits is usually sufficient.  The KeyLength must be a 
' multiple of 8.
crypt.KeyLength = 256

' Pad with NULL bytes (PHP pads with NULL bytes)
crypt.PaddingScheme = 3

' EncodingMode specifies the encoding of the output for
' encryption, and the input for decryption.
' It may be "hex", "url", "base64", or "quoted-printable".
crypt.EncodingMode = "hex"

' The blowfish algorithm uses a 64-bit block size, 
' therefore the IV must be 8 bytes:
Dim ivAscii As String = "12345678"
crypt.SetEncodedIV(ivAscii,"ascii")

' For 256-bit encryption, the key is 32 bytes:
Dim keyAscii As String = "1234567890123456ABCDEFGHIJKLMNOP"
crypt.SetEncodedKey(keyAscii,"ascii")

Dim plainText As String
plainText = "The quick brown fox jumped over the lazy dog"

Dim cipherText As String = crypt.EncryptStringENC(plainText)
Debug.WriteLine(cipherText)
' Output should be (case insensitive):
' 276855ca6c0d60f7d9708210440c1072e05d078e733b34b4198d609dc2fcc2f0c30926cdef3b6d52baf6e345aa03f83e

' Do 128-bit Blowfish encryption:
crypt.KeyLength = 128
keyAscii = "1234567890123456"
crypt.SetEncodedKey(keyAscii,"ascii")

cipherText = crypt.EncryptStringENC(plainText)
Debug.WriteLine(cipherText)
' Output should be (case insensitive):
' d2b5abb73208aea3790621d028afcc74d8dd65fb9ea8e666444a72523f5ecca60df79a424e2c714fa6efbafcc40bdca