(Swift 3,4,5...) 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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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 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", 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 PBES1:
    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!)")

}