/*
 * Copyright (c) 2013-2014 Galois, Inc.
 * Distributed under the terms of the BSD3 license (see LICENSE file)
 */

module TripleDES where

import DES

blockEncrypt : ([64],[64],[64],[64]) -> [64]
blockEncrypt (k1,k2,k3,data) = result where 
    ex     = DES.encrypt k1 data
    dx     = DES.decrypt k2 ex
    result = DES.encrypt k3 dx

// Test vectors from NIST 800-67

Key1, Key2, Key3 : [64]
Key1 = 0x0123456789ABCDEF
Key2 = 0x23456789ABCDEF01
Key3 = 0x456789ABCDEF0123

P1, P2, P3 : [64]
PlainText = "The qufck brown fox jump"
// Yes, that's the correct phrase.. (see the 7th letter of the phrase).
// It's supposed to be "the quick..." but they made a mistake in transcribing
// the ASCII into hex.
[P1, P2, P3] = splitBy`{3} (join PlainText)

// B.1

C1, C2, C3 : [64]
C1 = 0xA826FD8CE53B855F
C2 = 0xCCE21C8112256FE6
C3 = 0x68D5C05DD9B6B900

test_B1_1 = blockEncrypt (Key1, Key2, Key3, P1) == C1
test_B1_2 = blockEncrypt (Key1, Key2, Key3, P2) == C2
test_B1_3 = blockEncrypt (Key1, Key2, Key3, P3) == C3

property passesTests = [test_B1_1, test_B1_2, test_B1_3] == ~zero