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First passing test for the substituion sypher
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| Original file line number | Diff line number | Diff line change |
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| Feature: Encrypt Plain Text | ||
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| As a privacy nut I would like to encrypt text in the worst possible way by using a substitution cypher | ||
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| The cypher will replace each letter with another letter. Each letter will be used exactly once. | ||
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| My plain and text will be case insensitive and punctuation marks will not be encrypted | ||
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| Scenario: A simple plain text using all letters from the alphabet | ||
| Given the plain text | ||
| """ | ||
| the quick brown fox jumps over the lazy dog | ||
| """ | ||
| When I encrypt the text using the following letter substitution | ||
| | Plain text letter | Cypher text letter | | ||
| | A | B | | ||
| | B | C | | ||
| | C | D | | ||
| | D | E | | ||
| | E | F | | ||
| | F | G | | ||
| | G | H | | ||
| | H | I | | ||
| | I | J | | ||
| | J | K | | ||
| | K | L | | ||
| | L | M | | ||
| | M | N | | ||
| | N | O | | ||
| | O | P | | ||
| | P | Q | | ||
| | Q | R | | ||
| | R | S | | ||
| | S | T | | ||
| | T | U | | ||
| | U | V | | ||
| | V | W | | ||
| | W | X | | ||
| | X | Y | | ||
| | Y | Z | | ||
| | Z | A | | ||
| Then the cypher text should be | ||
| """ | ||
| UIF RVJDL CSPXO GPY KVNQT PWFS UIF MBAZ EPH | ||
| """ | ||
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| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using FluentAssertions; | ||
| using TechTalk.SpecFlow; | ||
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| namespace Cypher.Tests | ||
| { | ||
| [Binding] | ||
| public class EncryptPlainTextSteps | ||
| { | ||
| private string _plainText; | ||
| private string _encryptedText; | ||
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| [Given(@"the plain text")] | ||
| public void GivenThePlainText(string plainText) | ||
| { | ||
| _plainText = plainText; | ||
| } | ||
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| [When(@"I encrypt the text using the following letter substitution")] | ||
| public void WhenIEncryptTheTextUsingTheFollowingLetterSubstitution(Table table) | ||
| { | ||
| var cypher = new SubstitutionCypher(); | ||
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| foreach (var tableRow in table.Rows) | ||
| { | ||
| cypher.Substitute(tableRow[0]).For(tableRow[1]); | ||
| } | ||
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| _encryptedText = cypher.Encrypt(_plainText); | ||
| } | ||
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| [Then(@"the cypher text should be")] | ||
| public void ThenTheCypherTextShouldBe(string expectedCypherText) | ||
| { | ||
| _encryptedText.Should().Be(expectedCypherText); | ||
| } | ||
| } | ||
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| public class SubstitutionCypher | ||
| { | ||
| private readonly List<Substitution> _substitutionList; | ||
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| public SubstitutionCypher() | ||
| { | ||
| _substitutionList = new List<Substitution>(); | ||
| } | ||
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| public Substitution Substitute(string letterToSubstitute) | ||
| { | ||
| var substitution = new Substitution(letterToSubstitute.ToUpper()); | ||
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| _substitutionList.Add(substitution); | ||
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| return substitution; | ||
| } | ||
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| public string Encrypt(string plainText) | ||
| { | ||
| var encryptedText = ""; | ||
| foreach (var letter in plainText.ToUpper()) | ||
| { | ||
| var substitution = _substitutionList.SingleOrDefault( | ||
| s => s.LetterToSubstitute.Equals(letter.ToString(), StringComparison.OrdinalIgnoreCase)); | ||
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| if (substitution != null) | ||
| { | ||
| encryptedText += substitution.LetterToSubstituteWith; | ||
| } | ||
| else | ||
| { | ||
| encryptedText += letter; | ||
| } | ||
| } | ||
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| return encryptedText; | ||
| } | ||
| } | ||
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| public static class SubstitutionExtensionMethods | ||
| { | ||
| public static void For(this Substitution substitution, string letterToSubstituteWith) | ||
| { | ||
| substitution.LetterToSubstituteWith = letterToSubstituteWith.ToUpper(); | ||
| } | ||
| } | ||
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| public class Substitution | ||
| { | ||
| public string LetterToSubstitute { get; } | ||
| public string LetterToSubstituteWith { get; set; } | ||
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| public Substitution(string letterToSubstitute) | ||
| { | ||
| LetterToSubstitute = letterToSubstitute; | ||
| } | ||
| } | ||
| } |
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