(Swift 3,4,5...) 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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func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let crypt = CkoCrypt2()!

    // Set properties for PBES2 encryption:

    crypt.cryptAlgorithm = "pbes2"
    crypt.pbesPassword = "mySecretPassword"

    // Set the underlying PBE algorithm (and key length):
    crypt.pbesAlgorithm = "rc2"
    crypt.keyLength = 128
    // Only required for the RC2 algorithm:
    crypt.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:
    crypt.setEncodedIV("0000000000000000", encoding: "hex")

    // Give it some salt:
    crypt.setEncodedSalt("0102030405060708", encoding: "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 PBES2:
    crypt.hashAlgorithm = "sha1"

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

    var plainText: String? = "To be encrypted."

    var encryptedText: String? = crypt.encryptStringENC(plainText)

    print("\(encryptedText!)")

    // Now decrypt:
    var decryptedText: String? = crypt.decryptStringENC(encryptedText)

    print("\(decryptedText!)")

}