WinRT下的RSA加解密方法

        RSA公钥加密算法是1977年由罗纳德·李维斯特（Ron Rivest）、阿迪·萨莫尔（Adi Shamir）和伦纳德·阿德曼（Leonard Adleman）一起提出的。当时他们三人都在麻省理工学院工作。RSA就是他们三人姓氏开头字母拼在一起组成的。

        本文旨在针对WinRT下RSA加密方法的使用进行演示，希望仅为寻找WinRT下RSA加密可用类的小伙伴不用再寻寻觅觅。

        介绍分两步，一是建立RSA工具类，方便调用，二是举个简单的例子。

        一、建立RSA工具类

using System;using System.Collections.Generic;using System.Linq;using System.Runtime.InteropServices.WindowsRuntime;using System.Text;using System.Threading.Tasks;using Windows.Security.Cryptography;using Windows.Security.Cryptography.Core;using Windows.Storage.Streams;namespace UIDemo{    public class RSA    {        /// <summary>        /// 产生一对RSA密钥对，公钥加密，私钥解密。        /// 应该静态的保存要使用的密钥对        /// </summary>        /// <returns></returns>        public static RSAKeyPair CreateRSAKeyPair()        {            AsymmetricKeyAlgorithmProvider asym = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaPkcs1);            CryptographicKey key = asym.CreateKeyPair(1024);            IBuffer privateKeyBuffer = key.Export(CryptographicPrivateKeyBlobType.Capi1PrivateKey);            IBuffer publicKeyBuffer = key.ExportPublicKey(CryptographicPublicKeyBlobType.Capi1PublicKey);            byte[] privateKeyBytes;            byte[] publicKeyBytes;            CryptographicBuffer.CopyToByteArray(privateKeyBuffer, out privateKeyBytes);            CryptographicBuffer.CopyToByteArray(publicKeyBuffer, out publicKeyBytes);            string privateKey = Convert.ToBase64String(privateKeyBytes);            string publicKey = Convert.ToBase64String(publicKeyBytes);            return new RSAKeyPair(privateKey, publicKey);        }        /// <summary>        /// 使用公钥加密        /// </summary>        /// <param name="publicKey"></param>        /// <param name="data"></param>        /// <returns></returns>        public static byte[] Encrypt(string publicKey, string data)        {            IBuffer keyBuffer = CryptographicBuffer.DecodeFromBase64String(publicKey);            AsymmetricKeyAlgorithmProvider asym = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaPkcs1);            CryptographicKey key = asym.ImportPublicKey(keyBuffer, CryptographicPublicKeyBlobType.Capi1PublicKey);            IBuffer plainBuffer = CryptographicBuffer.ConvertStringToBinary(data, BinaryStringEncoding.Utf8);            IBuffer encryptedBuffer = CryptographicEngine.Encrypt(key, plainBuffer, null);            byte[] encryptedBytes;            CryptographicBuffer.CopyToByteArray(encryptedBuffer, out encryptedBytes);            return encryptedBytes;        }        /// <summary>        /// 使用私钥解密        /// </summary>        /// <param name="privateKey"></param>        /// <param name="data"></param>        /// <returns></returns>        public static string Decrypt(string privateKey, byte[] data)        {            IBuffer keyBuffer = CryptographicBuffer.DecodeFromBase64String(privateKey);            AsymmetricKeyAlgorithmProvider asym = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaPkcs1);            CryptographicKey key = asym.ImportKeyPair(keyBuffer, CryptographicPrivateKeyBlobType.Capi1PrivateKey);            IBuffer plainBuffer = CryptographicEngine.Decrypt(key, WindowsRuntimeBufferExtensions.AsBuffer(data), null);            byte[] plainBytes;            CryptographicBuffer.CopyToByteArray(plainBuffer, out plainBytes);            return Encoding.UTF8.GetString(plainBytes, 0, plainBytes.Length);        }    }    /// <summary>    /// RSA 的公钥与私钥    /// </summary>    public class RSAKeyPair    {        public string PrivateKey { get; set; }        public string PublicKey { get; set; }        public RSAKeyPair(string privateKey, string publicKey)        {            PrivateKey = privateKey;            PublicKey = publicKey;        }    }}

        二、使用示例如下

            RSAKeyPair kp = new RSAKeyPair(null, null);            // 通过以下语句生成一对密钥，再保存起来。其中公钥公开给加密方使用，私钥解密用。已保存则加载。            // RSAKeyPair kp = RSA.CreateRSAKeyPair();            // 加载静态密钥对            kp.PrivateKey = "BwIAAACkAABSU0EyAAQAAAEAAQBTiebuzvfndZCcc82O3ax0nRz0U20cDwWDuCKUIpdBPfNQD4gSp61RhMaX0x70IoY2oqnUGlQK1sYZ1vG9F7F7zIIAZVnb+3JwhcHU/4NVbMuS7+NDs5ncOUgiMO2Aj2KNB81gCcYmciv4FiuB8klGiHTwCV0GzrzXTBe/QavjujGOMjswtDFoBa2dgAmhnQXdpJoGRe3cZsyAXNQQvfdvOK/9i732O7DBle71ec0cY7T+993Z39QenI6X3s7N/NPDWhc7klLY04C950BKofjFV4HNVO4QhkTujpPnyfFnI0KVJGwit+tkS65pTBVdZ++EwgMQZug5CRHB2eG347DhsbJZXToWtTbzrDbVU6Oh2fvTYjWRopH4RiJnljr3rHNkBY05qat+jMaiBC8LRn6xUUyp6F3zhCRjcpgdefb/Jt+ujRTHEFOVLGR3S+PVD5/G0plhTW9QbOk30Zp/Tci2gWUs6tEXUElSYrlZJg0PZYVTSACinPzfE4t0tySfessaetdwVlarLjAejnWlx4CT+5BgV55I9FOmdjJSzYK6q4vwnlBOpyvwfL6kJlTW49vat1Syb/TmsjEz4sceDX890Wd0er5S/+eLvhiPfhhplQa2h2PyIOj0pStbF6W5BMV7b1P4JHdDRaQHaTBKMQFXDaFSpWgNbBAELfXHtsGBxcQ5smM1WNOsfYqrKg0OJaxu30QtrAIp0ucZWH1RtuOcneEndeTMtLXkG1vc5m7O9IFzv6GINlcRCZ6MGmbWzxY=";            kp.PublicKey = "BgIAAACkAABSU0ExAAQAAAEAAQBTiebuzvfndZCcc82O3ax0nRz0U20cDwWDuCKUIpdBPfNQD4gSp61RhMaX0x70IoY2oqnUGlQK1sYZ1vG9F7F7zIIAZVnb+3JwhcHU/4NVbMuS7+NDs5ncOUgiMO2Aj2KNB81gCcYmciv4FiuB8klGiHTwCV0GzrzXTBe/Qavjug==";            // 加密后形成的加密字节数组            byte[] miBytes = RSA.Encrypt(kp.PublicKey, "hello world!");            // Base64编码文本            string miBase64 = CryptographicBuffer.EncodeToBase64String(WindowsRuntimeBufferExtensions.AsBuffer(miBytes));             // 解密            CryptographicBuffer.CopyToByteArray(CryptographicBuffer.DecodeFromBase64String(miBase64), out miBytes);            string ori = RSA.Decrypt(kp.PrivateKey, miBytes);            txtInfo.Text = ori;