(VB.NET) PBES1 Password-Based Encryption (PBE)

Demonstrates how to implement password-based encryption according to the PKCS #5 v2.0: Password-Based Cryptography Standard (published by RSA Laboratories). This example uses PBES1, which ise based on the PBKDF1 function and an underlying block cipher such as RC2, DES, etc.

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

Dim crypt As New Chilkat.Crypt2

' Set properties for PBES1 encryption:

crypt.CryptAlgorithm = "pbes1"
crypt.PbesPassword = "mySecretPassword"

' Set the underlying PBE algorithm (and key length):
' For PBES1, the underlying algorithm must be either
' 56-bit DES or 64-bit RC2 
' (this is according to the PKCS#5 specifications at
' http://www.rsa.com/rsalabs/node.asp?id=2127   )
crypt.PbesAlgorithm = "rc2"
crypt.KeyLength = 64

' The salt for PBKDF1 is always 8 bytes:
crypt.SetEncodedSalt("0102030405060708","hex")

' A higher iteration count makes the algorithm more
' computationally expensive and therefore exhaustive
' searches (for breaking the encryption) is more difficult:
crypt.IterationCount = 1024

' A hash algorithm needs to be set for PBES1:
crypt.HashAlgorithm = "sha1"

' Indicate that the encrypted bytes should be returned
' as a hex string:
crypt.EncodingMode = "hex"

Dim plainText As String = "To be encrypted."

Dim encryptedText As String = crypt.EncryptStringENC(plainText)

Debug.WriteLine(encryptedText)

' Now decrypt:
Dim decryptedText As String = crypt.DecryptStringENC(encryptedText)

Debug.WriteLine(decryptedText)