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dukpt

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Implements a decrypter for ciphertext originating from a device using a Derived Unique Key Per Transaction (DUKPT) scheme

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# DUKPT

This library implements a decrypter for ciphertext originating from a device using a Derived Unique Key Per Transaction (DUKPT) scheme.

## Installation

Add this line to your application's Gemfile:

gem 'dukpt'

And then execute:

$ bundle

Or install it yourself as:

$ gem install dukpt

## Usage

# Instantiate a decrypter with your base derivation key (BDK)
    decrypter = DUKPT::Decrypter.new("0123456789ABCDEFFEDCBA9876543210")

# You can specify whether you want to use "ecb" cipher mode if needed. The default is "cbc".
    decrypter = DUKPT::Decrypter.new("0123456789ABCDEFFEDCBA9876543210", "ecb")
  
    # Pass the ciphertext and the current Key Serial Number (KSN), as hex encoded strings, to the decryptor to get back the plaintext
    ksn = "FFFF9876543210E00008"
    ciphertext = "C25C1D1197D31CAA87285D59A892047426D9182EC11353C051ADD6D0F072A6CB3436560B3071FC1FD11D9F7E74886742D9BEE0CFD1EA1064C213BB55278B2F12"
  
    plaintext = decrypter.decrypt(ciphertext, ksn) # => "%B5452300551227189^HOGAN/PAUL      ^08043210000000725000000?\x00\x00\x00\x00"
  
## Contributing

1. Fork it
2. Create your feature branch (`git checkout -b my-new-feature`)
3. Commit your changes (`git commit -am 'Added some feature'`)
4. Push to the branch (`git push origin my-new-feature`)
5. Create new Pull Request

dukpt

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