RSACryptoServiceProvider加密解密簽名驗簽和DESCryptoServiceProvider加解密

原文:RSACryptoServiceProvider加密解密簽名驗簽和DESCryptoServiceProvider加解密

C#在using System.Security.Cryptography下有 DESCryptoServiceProvider RSACryptoServiceProvider?
DESCryptoServiceProvider 是用于對稱加密 RSACryptoServiceProvider是用于非對稱加密?
對稱加密的意思：有一個密鑰 相當于加密算法，加密用它來加密，解密也需要用到它。因為加密解密都是用同一個密鑰所以叫對稱加密。 對稱加密有一個壞處只要擁有密鑰的人都可以解密。?
非對稱加密：就是有2個密鑰，一個是公鑰，一個是私鑰，私鑰是自己的，不能隨便給人，公鑰隨便給，無所謂。一般是別人用你的公鑰加密，然后把密文給你，你用你的私鑰解密，這樣一樣加密和解密不是同一個密鑰，所以叫非對稱。 非對稱的好處是假如沒有私鑰別人是無法解密的，就算加密的那個人他把數據加密了他也無法解密，加密者把密文和公鑰隨便給那個人都無法解密。?
數字簽名：數字簽名的意義就是這些數據與原文數據比對是否修改過，這個解釋有點麻煩，當初我也搞了好久才理解！一般是用自己的私鑰對數據進行簽名，然后用公鑰去驗證這個數據是否修改過?
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現在該說說DESCryptoServiceProvider 和RSACryptoServiceProvider 在C#中的具體怎么用:?
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1、用RSACryptoServiceProvider 加密解密?
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//加密解密用到的公鑰與私鑰 RSACryptoServiceProvider oRSA = new RSACryptoServiceProvider(); string privatekey=oRSA.ToXmlString(true);//私鑰 string publickey=oRSA.ToXmlString(false);//公鑰 //這兩個密鑰需要保存下來 byte[] messagebytes = Encoding.UTF8.GetBytes("luo羅"); //需要加密的數據 - //公鑰加密 RSACryptoServiceProvider oRSA1 = new RSACryptoServiceProvider(); oRSA1.FromXmlString(publickey); //加密要用到公鑰所以導入公鑰 byte[] AOutput = oRSA1.Encrypt(messagebytes ,false); //AOutput 加密以后的數據 - //私鑰解密 RSACryptoServiceProvider oRSA2 = new RSACryptoServiceProvider(); oRSA2.FromXmlString(privatekey); byte[] AInput = oRSA2.Decrypt(AOutput, false); string reslut=Encoding.ASCII.GetString(AInput)

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2、用RSACryptoServiceProvider簽名驗簽?
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byte[] messagebytes = Encoding.UTF8.GetBytes("luo羅"); RSACryptoServiceProvider oRSA = new RSACryptoServiceProvider(); string privatekey = oRSA.ToXmlString(true); string publickey = oRSA.ToXmlString(false); //私鑰簽名 RSACryptoServiceProvider oRSA3 = new RSACryptoServiceProvider(); oRSA3.FromXmlString(privatekey); byte[] AOutput = oRSA3.SignData(messagebytes, "SHA1"); //公鑰驗證 RSACryptoServiceProvider oRSA4 = new RSACryptoServiceProvider(); oRSA4.FromXmlString(publickey); bool bVerify = oRSA4.VerifyData(messagebytes, "SHA1", AOutput);

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3、用證書進行簽名?
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// 因為一般證書的私鑰是不可以導出的所以所以用第2種方法導入私鑰的來進行簽名行不通 byte[] messagebytes = Encoding.UTF8.GetBytes("luo羅"); string Path = @"D:\Certificate\1.P12"; X509Certificate2 x509 = new X509Certificate2(Path, "12345678"); SHA1 sha1 = new SHA1CryptoServiceProvider(); byte[] hashbytes = sha1.ComputeHash(messagebytes); //對要簽名的數據進行哈希 RSAPKCS1SignatureFormatter signe = new RSAPKCS1SignatureFormatter(); signe.SetKey(x509.PrivateKey); //設置簽名用到的私鑰 signe.SetHashAlgorithm("SHA1"); //設置簽名算法 byte[] reslut = signe.CreateSignature(hashbytes); //驗簽：與第2方法相同 RSACryptoServiceProvider oRSA4 = new RSACryptoServiceProvider(); oRSA4.FromXmlString(x509.PublicKey.Key.ToXmlString(false)); bool bVerify = oRSA4.VerifyData(messagebytes, "SHA1", reslut);

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4、用證書加密解密?
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string Path = @"D:\Certificate\1.P12"; X509Certificate2 x509 = new X509Certificate2(Path, "12345678"); byte[] data = System.Text.Encoding.UTF8.GetBytes("cheshi羅"); -//證書公鑰加密 RSACryptoServiceProvider oRSA1 = new RSACryptoServiceProvider(); oRSA1.FromXmlString(x509.PublicKey.Key.ToXmlString(false)); -byte[] AOutput = oRSA1.Encrypt(data, false); -//證書私鑰解密 RSACryptoServiceProvider rsa2 = (RSACryptoServiceProvider)x509.PrivateKey; byte[] plainbytes = rsa2.Decrypt(AOutput, false); string reslut = Encoding.UTF8.GetString(plainbytes);

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5用證書對文件加密解密，因為文件可能特別大 所以需要用流和buffer的方式來，鄙視把文件全部讀到byte[]里進行加密的人，假如文件5G，那全部讀到byte[]里崩潰掉?
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private void Form1_Load(object sender, EventArgs e) { x509=new X509Certificate2(Path, "12345678"); RSACryptoServiceProvider oRSA1 = new RSACryptoServiceProvider(); Encrypt(); Decrypt(); } private void Decrypt() { string FilePath = "2.txt"; string OutFile = "3.txt"; System.IO.FileStream picfs = new System.IO.FileStream(FilePath, System.IO.FileMode.Open); System.IO.FileStream fs = new System.IO.FileStream(OutFile, System.IO.FileMode.OpenOrCreate); oRSA1 = (RSACryptoServiceProvider)x509.PrivateKey; int blocksize = oRSA1.KeySize/8; -byte[] buffer, buffer1, encryblock; bool Closed = true; while (Closed) { buffer = null; buffer = new byte[blocksize]; int k = picfs.Read(buffer, 0, buffer.Length); if (k > 0) { if (blocksize == k) { encryblock = oRSA1.Decrypt(buffer, false); fs.Write(encryblock, 0, encryblock.Length); } else { buffer1 = new byte[k]; for (int i = 0; i < k; i++) { buffer1[i] = buffer[i]; } encryblock = oRSA1.Decrypt(buffer1, false); fs.Write(encryblock, 0, encryblock.Length); } } else { picfs.Close(); fs.Close(); Closed = false; } } -} private void Encrypt() { string FilePath = "1.txt"; string OutFile = "2.txt"; //證書公鑰加密 -oRSA1.FromXmlString(x509.PublicKey.Key.ToXmlString(false)); System.IO.FileStream picfs = new System.IO.FileStream(FilePath, System.IO.FileMode.Open); System.IO.FileStream fs = new System.IO.FileStream(OutFile, System.IO.FileMode.OpenOrCreate); int blocksize = 0; if (oRSA1.KeySize == 1024) { blocksize = 16; } else { blocksize = 8; } byte[] buffer, buffer1, encryblock; bool Closed = true; while (Closed) { buffer = null; buffer = new byte[blocksize]; int k = picfs.Read(buffer, 0, buffer.Length); if (k > 0) { if (blocksize == k) { encryblock = oRSA1.Encrypt(buffer, false); fs.Write(encryblock, 0, encryblock.Length); } else { buffer1 = new byte[k]; for (int i = 0; i < k; i++) { buffer1[i] = buffer[i]; } encryblock = oRSA1.Encrypt(buffer1, false); fs.Write(encryblock, 0, encryblock.Length); } } else { picfs.Close(); fs.Close(); Closed = false; } } }

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6用證書對文件進行簽名驗簽，因為文件可能特別大 所以需要用流和buffer的方式來??

private void Form1_Load(object sender, EventArgs e){x509 = new X509Certificate2(Path, "12345678");SignFile("1.txt", "11.txt");VerifyFile("1.txt", "11.txt");}private bool VerifyFile(string FileName, string SignedFileName){bool reslut = true;System.IO.StreamReader objread = new System.IO.StreamReader(FileName);System.IO.StreamReader objreadSigned = new System.IO.StreamReader(SignedFileName);RSACryptoServiceProvider VeryRsa = new RSACryptoServiceProvider();VeryRsa.FromXmlString(x509.PublicKey.Key.ToXmlString(false));int Inblocksize = 0;int Signedblocksize = 0;if (VeryRsa.KeySize == 1024){Inblocksize = 16;}else{Inblocksize = 8;}Signedblocksize = VeryRsa.KeySize / 8;bool Closed = true;byte[] Buffer; //原文緩存區byte[] InBuffer;//原文緩存區byte[] Buffer1;//簽名文件緩存區while (Closed){Buffer = null;Buffer = new byte[Inblocksize];int k = objread.BaseStream.Read(Buffer, 0, Buffer.Length);if (k > 0){if (Inblocksize == k) //讀出來的長度和緩存區一樣大 {Buffer1 = new byte[Signedblocksize];objreadSigned.BaseStream.Read(Buffer1, 0, Buffer1.Length);reslut = VeryRsa.VerifyData(Buffer,"SHA1",Buffer1);if (!reslut){Closed = false;}}else{ //意思是Buffer沒滿，只有k個字節，k字節后面全是空所以不需要驗簽InBuffer = new byte[k];for (int i = 0; i < k; i++){InBuffer[i] = Buffer[i];}Buffer1 = new byte[Signedblocksize];objreadSigned.BaseStream.Read(Buffer1, 0, Buffer1.Length);reslut = VeryRsa.VerifyData(InBuffer, "SHA1", Buffer1);if (!reslut){Closed = false;}}}else{//這里的意思是原文已經讀完畢了，并且已經和簽名文件對應驗簽成功，那么//簽名文件也必須讀完畢了。if (objreadSigned.BaseStream.Position!= objreadSigned.BaseStream.Length){reslut = false;}objreadSigned.Close();objread.Close();Closed = false;}}return reslut;}private void SignFile(string InFileName,string OutFileName){RSACryptoServiceProvider SignRsa = (RSACryptoServiceProvider)x509.PrivateKey;System.IO.StreamReader objread = new System.IO.StreamReader(InFileName);System.IO.StreamWriter objwrite = new System.IO.StreamWriter(OutFileName, false);int blocksize = 0;if (SignRsa.KeySize == 1024){blocksize = 16;}else{blocksize = 8;}bool Closed = true;byte[] Buffer = new byte[blocksize];byte[] buffer1, SignBytes;while (Closed){int k = objread.BaseStream.Read(Buffer, 0, Buffer.Length);if (k > 0){if (k == blocksize){SignBytes = SignRsa.SignData(Buffer, "SHA1");objwrite.BaseStream.Write(SignBytes, 0, SignBytes.Length);}else{buffer1 = new byte[k];for (int i = 0; i < k; i++){buffer1[i] = Buffer[i];}SignBytes = SignRsa.SignData(buffer1, "SHA1");objwrite.BaseStream.Write(SignBytes, 0, SignBytes.Length);}}else{Closed = false;objread.Close();objwrite.Close();}}}

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7、用DESCryptoServiceProvider 進行對稱加密?
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byte[] messagebytes = Encoding.UTF8.GetBytes("LUO羅"); //需要用的對稱密鑰 DESCryptoServiceProvider Des = new DESCryptoServiceProvider(); byte[] key = Des.Key; //加密 DESCryptoServiceProvider tdesProvider = new DESCryptoServiceProvider(); tdesProvider.Key = key; tdesProvider.Mode = CipherMode.ECB; byte[] encrypted = tdesProvider.CreateEncryptor().TransformFinalBlock(messagebytes, 0, messagebytes.Length); //解密 DESCryptoServiceProvider tdesProvider2 = new DESCryptoServiceProvider(); tdesProvider.Key = key1; tdesProvider.Mode = CipherMode.ECB; byte[] outputdata = tdesProvider.CreateDecryptor().TransformFinalBlock(encrypted, 0, encrypted.Length); string reslut = Encoding.UTF8.GetString(outputdata); //7用DESCryptoServiceProvider 加解密 流 CryptoStream csDecrypt = new CryptoStream(Stream, Des.CreateEncryptor(), CryptoStreamMode.Write);CryptoStream csDecrypt = new CryptoStream(Stream, Des.CreateDecryptor(), CryptoStreamMode.Write);

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posted on 2018-04-11 12:07 NET未來之路 閱讀(...) 評論(...) 編輯 收藏

轉載于:https://www.cnblogs.com/lonelyxmas/p/8794920.html

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