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A Ruby implementation of the Data Encryption Standard.

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RubyDES

RubyDES is a full Ruby implementation of the Data Encryption Standard. The purpose of this project was to allow Ruby programmers interested in cryptography a glimpse of how a robust cryptographic algorithm functions in a language they understand.

The best way to understand the RubyDES source code is by following along with a FIPS 46, which you can find at http://csrc.nist.gov/publications/fips/fips46-3/fips46-3.pdf

NOTE: DES is deprecated, and as such, you should not use this implementation in any project you are developing. I highly recommend the AES, TwoFish or Serpent algorithms through the OpenSSL library instead.

Running RubyDES

Using RubyDES is pretty easy. First, construct a new data and key block.

data = RubyDES::Block.new('mysecret')
key  = RubyDES::Block.new('hushhush')

Then, build a new RubyDES::Ctx object and supply the data and key block.

des = RubyDES::Ctx.new(data, key)

Finally, let it go.

encrypted_data = des.encrypt

You will then be returned a DES encrypted block that is completely secure against eavesdropping (if it were still 1997).

To decrypt an encrypted data block, just build a new RubyDES::Ctx object in similar fashion as before.

un_des = RubyDES::Ctx.new(encrypted_data, key)

And run the DES with the key schedule reversed.

decrypted_data = un_des.decrypt

You can then check to see if it all worked.

data.bit_array.eql?(decrypted_data.bit_array)

Enjoy!

Feedback

If you have any questions, comments or just want to talk shop about crypto, feel free to reach me through my website at http://www.robertsosinski.com.

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