Transformar programa Criptografia.java em um projeto C#

ololu-consorcio · Dec 13, 2023 · 9328e92 · 9328e92
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diff --git a/Criptografia-Itau.sln b/Criptografia-Itau.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34322.80
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Criptografia-Itau", "Criptografia-Itau\Criptografia-Itau.csproj", "{61BE2EAC-2222-4FA7-A0AF-34043D4AFD63}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{61BE2EAC-2222-4FA7-A0AF-34043D4AFD63}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{61BE2EAC-2222-4FA7-A0AF-34043D4AFD63}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{61BE2EAC-2222-4FA7-A0AF-34043D4AFD63}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{61BE2EAC-2222-4FA7-A0AF-34043D4AFD63}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {98D5C336-A7AE-4A54-BD50-876FA438ECD4}
+	EndGlobalSection
+EndGlobal
diff --git a/Criptografia-Itau/Criptografia-Itau.csproj b/Criptografia-Itau/Criptografia-Itau.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Criptografia_Itau</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
diff --git a/Criptografia-Itau/Program.cs b/Criptografia-Itau/Program.cs
@@ -0,0 +1,36 @@
+using Criptografia_Itau;
+
+try
+{
+    Console.WriteLine("\n=========================================");
+    Console.WriteLine("Informe as informações recebidas no e-mail");
+    Console.WriteLine("=========================================");
+
+    Console.Write("\nClientId: ");
+    string clientIdCifrado = Console.ReadLine().Trim();
+
+    Console.Write("\nToken Temporário: ");
+    string tokenCifrado = Console.ReadLine().Trim();
+
+    Console.Write("\nChave Sessão: ");
+    string chaveSessaoCifrada = Console.ReadLine().Trim();
+
+    Console.Write("\nCaminho chave privada: ");
+    string caminhoChavePrivada = Console.ReadLine().Trim();
+
+    Console.WriteLine("\n=====================================");
+    Console.WriteLine("    Processo de Decriptografia         ");
+    Console.WriteLine("=====================================");
+
+    // Decifra a chave de sessao AES com a chave RSA privada
+    byte[] chaveSessaoDecifrada = Utils.DecriptografiaRsa(caminhoChavePrivada, chaveSessaoCifrada);
+    // Decriptografa a credencial através da chave de sessão AES
+    string clientIdDecifrada = Utils.DecriptografiaAes(chaveSessaoDecifrada, clientIdCifrado);
+    Console.WriteLine("\nClient id decifrado com a chave de sessao AES:\n[ " + clientIdDecifrada + " ]");
+    string tokenDecifrado = Utils.DecriptografiaAes(chaveSessaoDecifrada, tokenCifrado);
+    Console.WriteLine("\nToken decifrado com a chave de sessao AES:\n[ " + tokenDecifrado + " ]");
+}
+catch (Exception e)
+{
+    Console.WriteLine(e.Message);
+}
diff --git a/Criptografia-Itau/Utils.cs b/Criptografia-Itau/Utils.cs
@@ -0,0 +1,101 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Criptografia_Itau
+{
+    public static class Utils
+    {
+        public static string ExtrairChaveRsaPem(string tipoChave, string arquivoChavesRsa)
+        {
+            try
+            {
+                using (var reader = new StreamReader(arquivoChavesRsa))
+                {
+                    StringBuilder sb = new StringBuilder();
+                    bool inKey = false;
+                    string line;
+                    while ((line = reader.ReadLine()) != null)
+                    {
+                        if (!inKey)
+                        {
+                            if (line.StartsWith("-----BEGIN ") && line.EndsWith(" " + tipoChave + " KEY-----"))
+                            {
+                                inKey = true;
+                            }
+                        }
+                        else
+                        {
+                            if (line.StartsWith("-----END ") && line.EndsWith(" " + tipoChave + " KEY-----"))
+                            {
+                                break;
+                            }
+                            sb.Append(line);
+                        }
+                    }
+                    return sb.ToString();
+                }
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine(e.Message);
+            }
+
+            return null;
+        }
+
+        public static string DecriptografiaAes(byte[] key, string cipherText)
+        {
+            try
+            {
+                using (Aes aesAlg = Aes.Create())
+                {
+                    aesAlg.Key = key;
+                    aesAlg.IV = new byte[16]; // Default IV with zeroes
+                    aesAlg.Mode = CipherMode.CBC;
+                    aesAlg.Padding = PaddingMode.PKCS7;
+
+                    ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
+                    byte[] cipherBytes = Convert.FromBase64String(cipherText);
+                    using (var msDecrypt = new MemoryStream(cipherBytes))
+                    {
+                        using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
+                        {
+                            using (var srDecrypt = new StreamReader(csDecrypt))
+                            {
+                                return srDecrypt.ReadToEnd();
+                            }
+                        }
+                    }
+                }
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine(e.Message);
+            }
+
+            return null;
+        }
+
+        public static byte[] DecriptografiaRsa(string caminhoChavePrivada, string dadosCifrados)
+        {
+            try
+            {
+                string chavePrivadaPem = ExtrairChaveRsaPem("PRIVATE", caminhoChavePrivada);
+                byte[] chavePrivadaBytes = Convert.FromBase64String(chavePrivadaPem);
+
+                using (RSA rsa = RSA.Create())
+                {
+                    rsa.ImportPkcs8PrivateKey(chavePrivadaBytes, out _);
+                    byte[] dadosCifradosBytes = Convert.FromBase64String(dadosCifrados);
+                    return rsa.Decrypt(dadosCifradosBytes, RSAEncryptionPadding.Pkcs1);
+                }
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine(e.Message);
+            }
+
+            return null;
+        }
+    }
+}