C# RSA 非對稱加密
阿新 • • 發佈：2021-07-12
程式碼：
RSAHelper.cs(RSA加密工具類)：
using System; using System.Security.Cryptography; using System.Text; namespace Utils { /// <summary> /// RSA加密工具類 /// </summary> public class RSAHelper { /// <summary> /// RSA加密 /// </summary> public static stringView CodeRSAEncrypt_LongContent(string publicKey, string content) { byte[] bytes = Encoding.UTF8.GetBytes(content); int pageSize = 117; int pageCount = (bytes.Length - 1) / pageSize + 1; StringBuilder result = new StringBuilder(); for (intpage = 1; page <= pageCount; page++) { int start = pageSize * (page - 1); byte[] subBytes = page == pageCount ? new byte[bytes.Length - start] : new byte[pageSize]; Array.Copy(bytes, start, subBytes, 0, subBytes.Length);string strEncrypted = RSAEncrypt(publicKey, Encoding.UTF8.GetString(subBytes)); result.Append(strEncrypted); } return result.ToString(); } /// <summary> /// RSA解密 /// </summary> public static string RSADecrypt_LongContent(string privateKey, string content) { int pageSize = 172; int pageCount = (content.Length - 1) / pageSize + 1; StringBuilder result = new StringBuilder(); for (int page = 1; page <= pageCount; page++) { int start = pageSize * (page - 1); string subContent = null; if (page != pageCount) { subContent = content.Substring(start, pageSize); } else { subContent = content.Substring(start, content.Length - start); } string strEncrypted = RSADecrypt(privateKey, subContent); result.Append(strEncrypted); } return result.ToString(); } /// <summary> /// RSA加密 /// </summary> public static string RSAEncrypt(string publicKey, string content) { RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); rsa.FromXmlString(publicKey); byte[] cipherBytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false); return Convert.ToBase64String(cipherBytes); } /// <summary> /// RSA解密 /// </summary> public static string RSADecrypt(string privateKey, string content) { RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); rsa.FromXmlString(privateKey); byte[] cipherBytes = rsa.Decrypt(Convert.FromBase64String(content), false); return Encoding.UTF8.GetString(cipherBytes); } /// <summary> /// 建立公鑰私鑰 /// </summary> public static RSAKey CreateKey() { RSAKey rsaKey = new RSAKey(); using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider()) { rsaKey.PublicKey_NET = rsa.ToXmlString(false); // 公鑰 rsaKey.PrivateKey_NET = rsa.ToXmlString(true); // 私鑰 rsaKey.PublicKey_Java = RSAKeyConvert.RSAPublicKeyDotNet2Java(rsaKey.PublicKey_NET); rsaKey.PrivateKey_Java = RSAKeyConvert.RSAPrivateKeyDotNet2Java(rsaKey.PrivateKey_NET); } return rsaKey; } } public class RSAKey { public string PublicKey_NET { get; set; } public string PrivateKey_NET { get; set; } public string PublicKey_Java { get; set; } public string PrivateKey_Java { get; set; } } }
RSAKeyConvert.cs(Java .NET RSA金鑰格式轉換)(需要安裝NuGet包BouncyCastle)：
using System; using System.Xml; using Org.BouncyCastle.Asn1.Pkcs; using Org.BouncyCastle.Asn1.X509; using Org.BouncyCastle.Crypto.Parameters; using Org.BouncyCastle.Math; using Org.BouncyCastle.Pkcs; using Org.BouncyCastle.Security; using Org.BouncyCastle.X509; namespace Utils { /// <summary> /// RSA金鑰格式轉換 /// </summary> public class RSAKeyConvert { /// <summary> /// RSA私鑰格式轉換，java->.net /// </summary> /// <param name="privateKey">java生成的RSA私鑰</param> public static string RSAPrivateKeyJava2DotNet(string privateKey) { RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey)); return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>", Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()), Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned())); } /// <summary> /// RSA私鑰格式轉換，.net->java /// </summary> /// <param name="privateKey">.net生成的私鑰</param> public static string RSAPrivateKeyDotNet2Java(string privateKey) { XmlDocument doc = new XmlDocument(); doc.LoadXml(privateKey); BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText)); BigInteger exp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText)); BigInteger d = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[0].InnerText)); BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[0].InnerText)); BigInteger q = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[0].InnerText)); BigInteger dp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[0].InnerText)); BigInteger dq = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[0].InnerText)); BigInteger qinv = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[0].InnerText)); RsaPrivateCrtKeyParameters privateKeyParam = new RsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv); PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam); byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded(); return Convert.ToBase64String(serializedPrivateBytes); } /// <summary> /// RSA公鑰格式轉換，java->.net /// </summary> /// <param name="publicKey">java生成的公鑰</param> public static string RSAPublicKeyJava2DotNet(string publicKey) { RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey)); return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>", Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()), Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned())); } /// <summary> /// RSA公鑰格式轉換，.net->java /// </summary> /// <param name="publicKey">.net生成的公鑰</param> public static string RSAPublicKeyDotNet2Java(string publicKey) { XmlDocument doc = new XmlDocument(); doc.LoadXml(publicKey); BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText)); BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText)); RsaKeyParameters pub = new RsaKeyParameters(false, m, p); SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub); byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded(); return Convert.ToBase64String(serializedPublicBytes); } } }View Code