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Add project files.
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‎FastModularExponentiation.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.9.34714.143
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FastModularExponentiationTest", "FastModularExponentiationTest\FastModularExponentiationTest.csproj", "{2ACD9A23-1C7C-4918-B877-6C749A46CA4B}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FastModularExponentiation", "FastModularExponentiation\FastModularExponentiation.csproj", "{E36D9AAA-5933-4198-BA6E-8B3BDACB41E6}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{2ACD9A23-1C7C-4918-B877-6C749A46CA4B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{2ACD9A23-1C7C-4918-B877-6C749A46CA4B}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{2ACD9A23-1C7C-4918-B877-6C749A46CA4B}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{2ACD9A23-1C7C-4918-B877-6C749A46CA4B}.Release|Any CPU.Build.0 = Release|Any CPU
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{E36D9AAA-5933-4198-BA6E-8B3BDACB41E6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{E36D9AAA-5933-4198-BA6E-8B3BDACB41E6}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{E36D9AAA-5933-4198-BA6E-8B3BDACB41E6}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{E36D9AAA-5933-4198-BA6E-8B3BDACB41E6}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {FD41D912-3746-4990-86DE-897E529DA4AC}
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EndGlobalSection
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EndGlobal

‎FastModularExponentiation/FastModularExponentiation.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<Authors>Łukasz Górski</Authors>
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<Copyright>Copyright © 2024 Łukasz Górski</Copyright>
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<PackageLicenseExpression>MIT</PackageLicenseExpression>
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</PropertyGroup>
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</Project>

‎FastModularExponentiation/Program.cs‎

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namespace FastModularExponentiation
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{
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public class Program
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{
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static void Main(string[] args)
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{
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int y = ReadInteger("Enter a: ");
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int exp = ReadInteger("Enter exponent: ");
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int mod = ReadInteger("Enter modulo: ");
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Console.WriteLine();
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int result = ModularExponentiation(y, exp, mod);
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Console.WriteLine();
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Console.WriteLine($"Result: {result}");
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}
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static int ReadInteger(string prompt)
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{
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Console.Write(prompt);
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return int.Parse(Console.ReadLine());
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}
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public static int ModularExponentiation(int y, int exp, int mod)
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{
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string binary = Convert.ToString(exp, 2);
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char[] binaryArray = binary.ToCharArray();
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Array.Reverse(binaryArray);
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int x = 1;
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Console.WriteLine($"{"i",2} | {"x",8} | {"a",8} | {"t_i"}");
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for (int i = 0; i < binaryArray.Length; ++i)
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{
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Console.WriteLine($"{i,2} | {x,8} | {y,8} | {binaryArray[i]}");
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x = binaryArray[i] == '0' ? x : (x * y) % mod;
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y = (y * y) % mod;
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}
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Console.WriteLine($"{binaryArray.Length,2} | {x,8} | {y,8} | -");
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return x;
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}
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}
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}

‎FastModularExponentiationTest/FastModularExponentiationTest.cs‎

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using FastModularExponentiation;
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namespace FastModularExponentiationTest
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{
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public class FastModularExponentiationTest
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{
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[Theory]
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[InlineData(450, 289, 520, 320)] // 450^289 % 520 = 320
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[InlineData(2, 1234, 1117, 1038)] // 2^1234 % 1117 = 1038
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[InlineData(2, 638, 1019, 396)] // 2^638 % 1019 = 396
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[InlineData(2, 719, 1019, 486)] // 2^719 % 1019 = 486
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[InlineData(486, 638, 1019, 498)] // 486^638 % 1019 = 498
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[InlineData(396, 719, 1019, 498)] // 396^719 % 1019 = 498
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[InlineData(20, 1001, 1739, 1327)] // 20^1001 % 1739 = 1327
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[InlineData(1327, 761, 1739, 20)] // 1327^761 % 1739 = 20
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[InlineData(508, 1001, 1739, 1454)] // 508^1001 % 1739 = 1454
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[InlineData(357, 761, 1739, 1630)] // 357^761 % 1739 = 1630
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[InlineData(1630, 1001, 1739, 357)] // 1630^1001 % 1739 = 357
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[InlineData(2, 937, 1619, 1454)] // 2^937 % 1619 = 1454
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[InlineData(1454, 320, 1619, 1154)] // 1454^320 % 1619 = 1154
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[InlineData(2, 195, 1619, 1380)] // 2^195 % 1619 = 1380
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[InlineData(1454, 195, 1619, 1053)] // 1454^195 % 1619 = 1053
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[InlineData(130, 681, 1619, 571)] // 130^681 % 1619 = 571
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[InlineData(2, 515, 1619, 1310)] // 2^515 % 1619 = 1310
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[InlineData(2, 357, 1619, 983)] // 2^357 % 1619 = 983
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[InlineData(1454, 1310, 1619, 807)] // 1454^1310 % 1619 = 807
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[InlineData(1310, 1579, 1619, 902)] // 1310^1579 % 1619 = 902
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public void FastModularExponentiationTestCalculationTest(int y, int exp, int mod, int expected)
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{
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int result = Program.ModularExponentiation(y, exp, mod);
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Assert.Equal(expected, result);
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}
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}
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}

‎FastModularExponentiationTest/FastModularExponentiationTest.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<IsPackable>false</IsPackable>
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<IsTestProject>true</IsTestProject>
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<Authors>Łukasz Górski</Authors>
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<Copyright>Copyright © 2024 Łukasz Górski</Copyright>
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<PackageLicenseExpression>MIT</PackageLicenseExpression>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="coverlet.collector" Version="6.0.2">
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<PrivateAssets>all</PrivateAssets>
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<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
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</PackageReference>
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
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<PackageReference Include="xunit" Version="2.8.1" />
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<PackageReference Include="xunit.runner.visualstudio" Version="2.8.1">
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<PrivateAssets>all</PrivateAssets>
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<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
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</PackageReference>
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</ItemGroup>
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<ItemGroup>
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<Reference Include="FastModularExponentiation">
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<HintPath>..\FastModularExponentiation\bin\Debug\net8.0\FastModularExponentiation.dll</HintPath>
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</Reference>
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</ItemGroup>
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<ItemGroup>
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<Using Include="Xunit" />
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</ItemGroup>
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</Project>

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