便携式类库（PCL）贡献 – 密码学
我想在codeplex上的Portable Class Library Contrib项目中使用加密，但是没有找到关于如何使用它的任何文档。
我想在其中创建一个包含Encrypt和Decrypt方法的包装类，我希望这个包装类存在于一个可移植的类库中。 我在这个项目中引用了Portable.Runtime和Portable.Security.Cryptography 。 它是否正确？
然后我想在.NET，Windows Phone和Metro项目中使用我的包装器。 在这些项目中，我引用了我的包装器项目， Portable.Runtime ， Portable.Security.Cryptography和相应的Portable项目，即Portable.Desktop ， Portable.Phone或Portable.WindowsStore 。 它是否正确？
但是当我尝试使用我的包装器类时，我遇到了冲突的命名空间错误。 这是错误和我的包装类：
System.Security.Cryptography.AesManaged类型存在于C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\Profile\Client\System.Core.dll和C:\Downloads\PclContrib\bin\Debug\Portable.Security.Cryptography.dll
public sealed class SymmetricCryptography where T : SymmetricAlgorithm, new() { private readonly T provider = new T(); private readonly UTF8Encoding utf8 = new UTF8Encoding(); private byte[] key; private byte[] iv; public byte[] Key { get { return this.key; } } public byte[] IV { get { return this.iv; } } public SymmetricCryptography() { this.key = this.provider.Key; this.iv = this.provider.IV; } public SymmetricCryptography(byte[] key, byte[] iv) { this.key = key; this.iv = iv; } public SymmetricCryptography(string password, string salt) { Rfc2898DeriveBytes deriveBytes = new Rfc2898DeriveBytes(password, this.utf8.GetBytes(salt)); this.key = deriveBytes.GetBytes(this.provider.KeySize >> 3); this.iv = deriveBytes.GetBytes(16); } public SymmetricCryptography(string password, string salt, int iterations) { Rfc2898DeriveBytes deriveBytes = new Rfc2898DeriveBytes(password, this.utf8.GetBytes(salt), iterations); this.key = deriveBytes.GetBytes(this.provider.KeySize >> 3); this.iv = deriveBytes.GetBytes(16); } public byte[] Encrypt(byte[] input) { return this.Encrypt(input, this.key, this.iv); } public byte[] Encrypt(byte[] input, byte[] key, byte[] iv) { return this.Transform( input, this.provider.CreateEncryptor(key, iv)); } public byte[] Decrypt(byte[] input) { return this.Decrypt(input, this.key, this.iv); } public byte[] Decrypt(byte[] input, byte[] key, byte[] iv) { return this.Transform( input, this.provider.CreateDecryptor(key, iv)); } public string Encrypt(string text) { return this.Encrypt(text, this.key, this.iv); } public string Encrypt(string text, byte[] key, byte[] iv) { byte[] output = this.Transform( this.utf8.GetBytes(text), this.provider.CreateEncryptor(key, iv)); return Convert.ToBase64String(output); } public string Decrypt(string text) { return this.Decrypt(text, this.key, this.iv); } public string Decrypt(string text, byte[] key, byte[] iv) { byte[] output = this.Transform( Convert.FromBase64String(text), this.provider.CreateDecryptor(key, iv)); return this.utf8.GetString(output, 0, output.Length); } public void Encrypt(Stream input, Stream output) { this.Encrypt(input, output, this.key, this.iv); } public void Encrypt(Stream input, Stream output, byte[] key, byte[] iv) { this.TransformStream(true, ref input, ref output, key, iv); } public void Decrypt(Stream input, Stream output) { this.Decrypt(input, output, this.key, this.iv); } public void Decrypt(Stream input, Stream output, byte[] key, byte[] iv) { this.TransformStream(false, ref input, ref output, key, iv); } private byte[] Transform( byte[] input, ICryptoTransform cryptoTransform) { byte[] result; using (MemoryStream memoryStream = new MemoryStream()) { using (CryptoStream cryptStream = new CryptoStream( memoryStream, cryptoTransform, CryptoStreamMode.Write)) { cryptStream.Write(input, 0, input.Length); cryptStream.FlushFinalBlock(); memoryStream.Position = 0; result = memoryStream.ToArray(); } } return result; } private void TransformStream(bool encrypt, ref Stream input, ref Stream output, byte[] key, byte[] iv) { // defensive argument checking if (input == null) { throw new ArgumentNullException("input"); } if (output == null) { throw new ArgumentNullException("output"); } if (!input.CanRead) { throw new ArgumentException("Unable to read from the input Stream.", "input"); } if (!output.CanWrite) { throw new ArgumentException("Unable to write to the output Stream.", "output"); } // make the buffer just large enough for // the portion of the stream to be processed byte[] inputBuffer = new byte[input.Length - input.Position]; // read the stream into the buffer input.Read(inputBuffer, 0, inputBuffer.Length); // transform the buffer byte[] outputBuffer = encrypt ? Encrypt(inputBuffer, key, iv) : Decrypt(inputBuffer, key, iv); // write the transformed buffer to our output stream output.Write(outputBuffer, 0, outputBuffer.Length); } }
文档有点缺乏，但我在常见问题中称之为：
我可以与我的平台特定项目共享PclContrib中的类型吗？ 不，不是。 虽然PclContrib中的类型看起来和感觉像是特定于平台的对应物，但运行时和编译器会将它们视为完全不同的类型。 虽然我们对如何使这项工作有一些想法，但这是我们短期内不会考虑的function。
以下.net代码适用于桌面实现。 首先添加对Portable.Desktop和Portable.Security.Cryptography.ProtectedData的引用
private void button2_Click(object sender, EventArgs e) { String encrypted = PCL.CentralClass.Encrypt("yo"); String decreypted = PCL.CentralClass.Decrypt(encrypted); //PCL.CentralClass. } //https://pclcontrib.codeplex.com/documentation?FocusElement=Comment //\Source\Portable.Security.Cryptography.ProtectedData\Security\Cryptography\ProtectedData.cs static byte[] GetBytes(string str) { byte[] bytes = new byte[str.Length * sizeof(char)]; System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length); return bytes; } static string GetString(byte[] bytes) { char[] chars = new char[bytes.Length / sizeof(char)]; System.Buffer.BlockCopy(bytes, 0, chars, 0, bytes.Length); return new string(chars); } public static String Encrypt(String strEncrypt) { byte[] userData = GetBytes(strEncrypt); byte[] optionalEntropy = null; byte[] x = System.Security.Cryptography.ProtectedData.Protect(userData, optionalEntropy); return GetString(x); } public static String Decrypt(String strDecrypt) { byte[] encryptedData = GetBytes(strDecrypt); byte[] optionalEntropy = null; byte[] x = System.Security.Cryptography.ProtectedData.Unprotect(encryptedData, optionalEntropy); return GetString(x); ; }
事实certificate，我的加密算法的通用包装器导致了一个问题。 PCL Contrib包含一个名为SymmetricAlgorithm的类，它本身就是真正的SymmetricAlgorithm的包装器。 如果我使我的包装类非generics，它的工作原理如下：
public sealed class AesManagedSymmetricCryptography : SymmetricCryptography { #region Constructors public AesManagedSymmetricCryptography() { } public AesManagedSymmetricCryptography(byte[] key, byte[] iv) : base(key, iv) { } public AesManagedSymmetricCryptography(string password, string salt) : base(password, salt) { } public AesManagedSymmetricCryptography(string password, string salt, int iterations) : base(password, salt, iterations) { } #endregion }