(Lianja) PBES2 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 PBES2, which ise based on the PBKDF2 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 PBES2 encryption:

loCrypt.CryptAlgorithm = "pbes2"
loCrypt.PbesPassword = "mySecretPassword"

// Set the underlying PBE algorithm (and key length):
loCrypt.PbesAlgorithm = "rc2"
loCrypt.KeyLength = 128
// Only required for the RC2 algorithm:
loCrypt.Rc2EffectiveKeyLength = 128

// By definition, the block encryption algorithm (RC2 or whichever
// was selected) will run in CBC mode.  Therefore, we need
// an IV.  The IV is equal in length to the block size of the
// algorithm.  RC2 has a block size of 8 bytes (regardless of
// key length), so set the IV to some value that is 8 bytes 
// in length:
loCrypt.SetEncodedIV("0000000000000000","hex")

// Give it some salt:
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 PBES2:
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