脚本宝典收集整理的这篇文章主要介绍了RSA加密封装类，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。
public static class RSAHelPEr { /// <summary> /// 生成公钥和私钥对 /// </summary> public static void GeneratePublicAndPRivateKeyInfo() { RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); using (StreamWrITer writer = new StreamWriter("PrivateKey.XMl")) //这个文件要保密... { string privateKey = rsa.ToXMLString(true); writer.WriteLine(privateKey); } using (StreamWriter writer = new StreamWriter("PublicKey.xml")) { string publicKey = rsa.ToXmlString(false); writer.WriteLine(publicKey); } } /// <summary> /// 用私钥给数据进行RSA加密 /// </summary> /// <param name="xmlPrivateKey"> 私钥(XML格式字符串)</param> /// <param name="strEncryptString">要加密的数据</param> /// <returns> 加密后的数据 </returns> public static string PrivateKeyEncrypt(string xmlPrivateKey, string strEncryptString) { //加载私钥 RSACryptoServiceProvider privateRsa = new RSACryptoServiceProvider(); privateRsa.FromXmlString(xmlPrivateKey); //转换密钥 AsymmetricCipherKeyPair keyPair = DotNetUtilities.GetKeyPair(privateRsa); IBufferedCipher c = CipherUtilities.GetCipher("RSA/ECB/PKCS1Padding"); //使用RSA/ECB/PKCS1Padding格式 //第一个参数为true表示加密，为false表示解密；第二个参数表示密钥 c.Init(true, keyPair.Private); byte[] dataToEncrypt = Encoding.UTF8.GetBytes(strEncryptString); #region 分段加密 int bufferSize = (privateRsa.KeySize / 8) - 11; byte[] buffer = new byte[bufferSize]; byte[] outBytes = null; //分段加密 using (MemoryStream input = new MemoryStream(dataToEncrypt)) using (MemoryStream ouput = new MemoryStream()) { while (true) { int readLine = input.Read(buffer, 0, bufferSize); if (readLine <= 0) { break; } byte[] temp = new byte[readLine]; Array.Copy(buffer, 0, temp, 0, readLine); byte[] encrypt = c.DoFinal(temp); ouput.Write(encrypt, 0, encrypt.Length); } outBytes = ouput.ToArray(); } #endregion //byte[] outBytes = c.DoFinal(DataToEncrypt);//加密 string strBase64 = Convert.ToBase64String(outBytes); return strBase64; } /// <summary> /// 用公钥给数据进行RSA解密 /// </summary> /// <param name="xmlPublicKey"> 公钥(XML格式字符串) </param> /// <param name="strDecryptString"> 要解密数据 </param> /// <returns> 解密后的数据 </returns> public static string PublicKeyDecrypt(string xmlPublicKey, string strDecryptString) { //加载公钥 RSACryptoServiceProvider publicRsa = new RSACryptoServiceProvider(); publicRsa.FromXmlString(xmlPublicKey); RSAParameters rp = publicRsa.exportParameters(false); //转换密钥 AsymmetricKeyParameter pbk = DotNetUtilities.GetRsaPublicKey(rp); IBufferedCipher c = CipherUtilities.GetCipher("RSA/ECB/PKCS1Padding"); //第一个参数为true表示加密，为false表示解密；第二个参数表示密钥 c.Init(false, pbk); byte[] outBytes = null; byte[] dataToDecrypt = Convert.FromBase64String(strDecryptString); #region 分段解密 int keySize = publicRsa.KeySize / 8; byte[] buffer = new byte[keySize]; using (MemoryStream input = new MemoryStream(dataToDecrypt)) using (MemoryStream output = new MemoryStream()) { while (true) { int readLine = input.Read(buffer, 0, keySize); if (readLine <= 0) { break; } byte[] temp = new byte[readLine]; Array.Copy(buffer, 0, temp, 0, readLine); byte[] decrypt = c.DoFinal(temp); output.Write(decrypt, 0, decrypt.Length); } outBytes = output.ToArray(); } #endregion //byte[] outBytes = c.DoFinal(DataToDecrypt);//解密 string strDec = Encoding.UTF8.GetString(outBytes); return strDec; } /// <summary> /// 使用公钥加密，分段加密 /// </summary> /// <param name="content"></param> /// <param name="privateKeyPath"></param> /// <returns></returns> public static string EncrytByPublic(string publicKeyPath, string strEncryptString) { RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); rsa.FromXmlString(ReaDFile(publicKeyPath)); byte[] originalData = Encoding.UTF8.GetBytes(strEncryptString); if (originalData == null || originalData.Length <= 0) { throw new NotSupportedException(); } if (rsa == null) { throw new argumentNullException(); } byte[] encryContent = null; #region 分段加密 int bufferSize = (rsa.KeySize / 8) - 11; byte[] buffer = new byte[bufferSize]; //分段加密 using (MemoryStream input = new MemoryStream(originalData)) using (MemoryStream ouput = new MemoryStream()) { while (true) { int readLine = input.Read(buffer, 0, bufferSize); if (readLine <= 0) { break; } byte[] temp = new byte[readLine]; Array.Copy(buffer, 0, temp, 0, readLine); byte[] encrypt = rsa.Encrypt(temp, false); ouput.Write(encrypt, 0, encrypt.Length); } encryContent = ouput.ToArray(); } #endregion return Convert.ToBase64String(encryContent); } /// <summary> /// 使用公钥加密，分段加密 /// </summary> /// <param name="content"></param> /// <param name="privateKeyPath"></param> /// <returns></returns> public static string EncrytByPublicNew(string publicKey, string strEncryptString) { RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); rsa.FromXmlString(publicKey); byte[] originalData = Encoding.UTF8.GetBytes(strEncryptString); if (originalData == null || originalData.Length <= 0) { throw new NotSupportedException(); } if (rsa == null) { throw new argumentNullException(); } byte[] encryContent = null; #region 分段加密 int bufferSize = (rsa.KeySize / 8) - 11; byte[] buffer = new byte[bufferSize]; //分段加密 using (MemoryStream input = new MemoryStream(originalData)) using (MemoryStream ouput = new MemoryStream()) { while (true) { int readLine = input.Read(buffer, 0, bufferSize); if (readLine <= 0) { break; } byte[] temp = new byte[readLine]; Array.Copy(buffer, 0, temp, 0, readLine); byte[] encrypt = rsa.Encrypt(temp, false); ouput.Write(encrypt, 0, encrypt.Length); } encryContent = ouput.ToArray(); } #endregion return Convert.ToBase64String(encryContent); } /// <summary> /// 通过私钥解密，分段解密 /// </summary> /// <param name="content"></param> /// <param name="privateKeyPath"></param> /// <returns></returns> public static string DecryptByPrivate(string privateKeyPath, string strDecryptString) { RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); rsa.FromXmlString(ReadFile(privateKeyPath)); byte[] encryptData = Convert.FromBase64String(strDecryptString); //byte[] dencryContent = rsa.Decrypt(encryptData, false); byte[] dencryContent = null; #region 分段解密 if (encryptData == null || encryptData.Length <= 0) { throw new NotSupportedException(); } int keySize = rsa.KeySize / 8; byte[] buffer = new byte[keySize]; using (MemoryStream input = new MemoryStream(encryptData)) using (MemoryStream output = new MemoryStream()) { while (true) { int readLine = input.Read(buffer, 0, keySize); if (readLine <= 0) { break; } byte[] temp = new byte[readLine]; Array.Copy(buffer, 0, temp, 0, readLine); byte[] decrypt = rsa.Decrypt(temp, false); output.Write(decrypt, 0, decrypt.Length); } dencryContent = output.ToArray(); } #endregion return Encoding.UTF8.GetString(dencryContent); } /// <summary> /// 读取文件 /// </summary> /// <param name="filePath"></param> /// <returns></returns> public static string ReadFile(string filePath) { string content = ""; if (File.Exists(filePath)) { content = File.ReadAllText(filePath); byte[] mybyte = Encoding.UTF8.GetBytes(content); content = Encoding.UTF8.GetString(mybyte); } return content; } /// <summary> /// RSA公钥格式转换，java->.net /// </summary> /// <param name="publicKey">java生成的公钥</param> /// <returns></returns> 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私钥格式转换，java->.net /// </summary> /// <param name="privateKey">java生成的RSA私钥</param> /// <returns></returns> 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())); } }
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