EnScrypt(tm) is an encryption tool for Macintosh based scripting environments, and FreeBees(tm) is a tool for Macintosh cryptographers that works with EnScrypt to build digital signatures, secure passwords, and other sophisticated security tools. EnScrypt and FreeBees are part of a series of software products for both the developer and the consumer which concentrate on the functional area of security. EnScrypt and FreeBees are implemented as suites of "Osaxen" inside Scripting Additions. Osaxen are fast sub-routines that can be called by AppleScript (and other OSA languages) on MacOS systems.

Installation Instructions: To use EnScrypt and FreeBees, put the contents of the folder "Contents-->Scripting Additions" inside the "Scripting Additions" folder which is inside your System Folder and/or Extensions folder (depending on your version of MacOS). There are three files that need to be put there: EnScrypt Lite, EnScrypt (HW), and FreeBees.

EnScrypt is an indispensable tool for software developers, script writers and anyone needing to provide encryption security on the Macintosh platform. Encryption is provided for EnScrypt by the "Blowfish." " Blowfish" is one of several very secure and well-known symmetric encryption algorithims. References, "white papers" and sourcecode for "Blowfish" can be obtained at http://www.counterpane.com.

EnScrypt comes in several standard configurations.

EnScrypt (Lite): Demoware. This is a demo version of EnScrypt that will operate for 90 days. It is restricted in the power of its encryption (24 bit keys) that makes it satisfactory only for testing. Pass any text or file to EnScrypt together with a key, and it will pass back the encrypted text. Pass it an encrypted text, and it passes back the original.

Regular Versions of EnScrypt.
1. Key length. The standard key lengths are 40 bits, 56 bits, 128 bits, and 256 bits. Other strengths can be built on a custom basis.

2. Custom Keys. Consider binding the function of EnScrypt to your application with an "enslavement" key. We can build a custom version of EnScrypt for any application.

3. Padding specification. Texts encrypted by EnScrypt are compatible with other implentations of "Blowfish" with the following caveat: The standard version of EnScrypt handles padding in a way that pads with random bits in the encrypted data, and then strips them from decrypted data to produce an exact original (further details below**). Other implementations of Blowfish handle padding differently (or not at all). In order to make EnScrypt compatible with another version of Blowfish (so that you can transmit data between them), padding specifications must be made compatible. EnScrypt can be customized for this purpose.

**Padding Details. The Blowfish encryption algorithm encrypts text in 64-bit (8-character) blocks. This means that from 1 to 7 characters must be added to the end of a message. In order to ensure that the extra characters are truncated from the decrypted text, EnScrypt pads all plaintext before encrypting it, the last extra byte receiving the number of extra bytes, including itself. So a message that ends on an 8-character boundary receives 7 randomly chosen characters plus the value 7. Upon decryption, the last byte is read and its value indicates the number of bytes that must be truncated from the plaintext to recreate the original message.

June 3, 1999. Version 1.0 is released

June 18, 1999. Version 1.01. Adds documentation and example scripts for doing encryption, digital signatures, and password authentication. Also includes the FreeBees osaxen.

June 22, 1999. Version 1.02. Fixes a bug. Different versions EnScrypt are now compatible with each other and with other implementations of "Blowfish."

August 24, 1999. Version 1.5. Padding improvements, another bug fix, a time limitation in EnScrypt Lite, more flexibility with implementation, improved sample scripts.

  EnScrypt Syntax and Samples

Following is the Applescript syntax and samples for (EnScrypt Lite). There are more samples in the folder "Demos and Samples." Except for the prefix "HWL", the other versions of EnScrypt are identical.

HWL Make Subkeys:
use the key supplied by the user to create subkeys. Creates the subkeys which do the actual encryption.
Result: 'HW!!' -- the result (passed back to the script)

HWL Encrypt String: use the keys generated in HW Make Keys to encrypt the data. EnScrypt will encrypt any string
subkeys 'HW!!' -- this is the keylist created by ‘make subkeys’
Result: string -- Encrypted text.

HWL Decrypt String:
use the keys generated in make keys to decrypt the data. This is the encrypted text.
subkeys 'HW!!' -- this is the keylist created by ‘make subkeys’
Result: string -- Decrypted text.

  FreeBees