(Lianja) 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.

loCrypt = createobject("CkCrypt2")

// Set properties for PBES1 encryption:

loCrypt.CryptAlgorithm = "pbes1"
loCrypt.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   )
loCrypt.PbesAlgorithm = "rc2"
loCrypt.KeyLength = 64

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

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

// A hash algorithm needs to be set for PBES1:
loCrypt.HashAlgorithm = "sha1"

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

lcPlainText = "To be encrypted."

lcEncryptedText = loCrypt.EncryptStringENC(lcPlainText)

? lcEncryptedText

// Now decrypt:
lcDecryptedText = loCrypt.DecryptStringENC(lcEncryptedText)

? lcDecryptedText


release loCrypt