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using Org.BouncyCastle.Asn1.Pkcs;
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using Org.BouncyCastle.Asn1.X509;
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using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Math;
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using Org.BouncyCastle.Pkcs;
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using Org.BouncyCastle.Security;
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using Org.BouncyCastle.X509;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Security.Cryptography;
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using System.Text;
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using System.Xml;
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namespace ConvertHelper
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{
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public class RSAEncrypt
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{
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public RSAEncrypt(string pubkey) {
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PublicKey= pubkey;
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}
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public static string PublicKey ="";
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/// <summary>
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/// RSA的加密函数 string
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/// </summary>
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/// <param name="publicKey">公钥</param>
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/// <param name="plaintext">明文</param>
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/// <returns></returns>
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public static string Encrypt(string plaintext)
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{
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return Encrypt(Encoding.UTF8.GetBytes(plaintext));
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}
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/// <summary>
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/// RSA的加密函数 string
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/// </summary>
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/// <param name="publicKey">公钥</param>
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/// <param name="plainbytes">明文字节数组</param>
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/// <returns></returns>
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public static string Encrypt(byte[] plainbytes)
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{
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using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
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{
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//string publickey = @"<RSAKeyValue><Modulus>" + PublicKey.Replace("\r\n", "") + "</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
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string publickey = PublicKey.Replace("\r\n", "");
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rsa.FromXmlString(Encoding.UTF8.GetString(Convert.FromBase64String(publickey)));
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//rsa.FromXmlString(publickey);
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var bufferSize = (rsa.KeySize / 8 - 11);
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byte[] buffer = new byte[bufferSize];//待加密块
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using (MemoryStream msInput = new MemoryStream(plainbytes))
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{
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using (MemoryStream msOutput = new MemoryStream())
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{
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int readLen;
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while ((readLen = msInput.Read(buffer, 0, bufferSize)) > 0)
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{
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byte[] dataToEnc = new byte[readLen];
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Array.Copy(buffer, 0, dataToEnc, 0, readLen);
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byte[] encData = rsa.Encrypt(dataToEnc, false);
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msOutput.Write(encData, 0, encData.Length);
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}
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byte[] result = msOutput.ToArray();
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rsa.Clear();
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return Convert.ToBase64String(result);
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}
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}
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}
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}
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/// <summary>
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/// 使用公钥加密，分段加密
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/// </summary>
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/// <param name="content"></param>
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/// <param name="privateKeyPath"></param>
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/// <returns></returns>
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public static string EncrytByPublic(string xmlPublicKey, string strEncryptString)
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{
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RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
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rsa.FromXmlString(xmlPublicKey);
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byte[] originalData = Encoding.UTF8.GetBytes(strEncryptString);
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if (originalData == null || originalData.Length <= 0)
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{
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throw new NotSupportedException();
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}
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if (rsa == null)
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{
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throw new ArgumentNullException();
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}
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byte[] encryContent = null;
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#region 分段加密
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int bufferSize = (rsa.KeySize / 8) - 11;
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byte[] buffer = new byte[bufferSize];
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//分段加密
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using (MemoryStream input = new MemoryStream(originalData))
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using (MemoryStream ouput = new MemoryStream())
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{
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while (true)
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{
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int readLine = input.Read(buffer, 0, bufferSize);
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if (readLine <= 0)
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{
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break;
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}
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byte[] temp = new byte[readLine];
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Array.Copy(buffer, 0, temp, 0, readLine);
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byte[] encrypt = rsa.Encrypt(temp, false);
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ouput.Write(encrypt, 0, encrypt.Length);
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}
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encryContent = ouput.ToArray();
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}
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#endregion
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return Convert.ToBase64String(encryContent);
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}
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}
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public class RSAUtil
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{
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/// <summary>
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/// 生成公钥与私钥方法
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/// </summary>
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/// <returns></returns>
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public static string[] CreateKey(KeyType keyType, KeySize keySize)
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{
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try
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{
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string[] sKeys = new string[2];
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RSACryptoServiceProvider rsa = new RSACryptoServiceProvider((int)keySize);
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switch (keyType)
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{
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case KeyType.XML:
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{
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//私钥
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sKeys[0] = rsa.ToXmlString(true);
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//公钥
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sKeys[1] = rsa.ToXmlString(false);
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}
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break;
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case KeyType.PKS8:
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{
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sKeys[0] = rsa.ToXmlString(true);
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//公钥
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sKeys[1] = rsa.ToXmlString(false);
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//JAVA私钥
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sKeys[0] = RSAPrivateKeyDotNet2Java(sKeys[0]);
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//JAVA公钥
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sKeys[1] = RSAPublicKeyDotNet2Java(sKeys[1]);
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}
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break;
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default:
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break;
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}
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return sKeys;
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}
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catch
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{
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return null;
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}
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}
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/// <summary>
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/// 密钥类型
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/// </summary>
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public enum KeyType
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{
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/// <summary>
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/// xml类型
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/// </summary>
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XML,
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/// <summary>
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/// pks8类型
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/// </summary>
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PKS8
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}
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/// <summary>
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/// 密钥尺寸(一般都是1024位的)
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/// </summary>
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public enum KeySize
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{
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SMALL = 1024,
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BIG = 2048
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}
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/// <summary>
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/// RSA私钥格式转换，.net->java
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/// </summary>
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/// <param name="privateKey">.net生成的私钥</param>
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/// <returns></returns>
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public static string RSAPrivateKeyDotNet2Java(string privateKey)
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{
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XmlDocument doc = new XmlDocument();
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doc.LoadXml(privateKey);
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BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
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BigInteger exp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
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BigInteger d = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[0].InnerText));
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BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[0].InnerText));
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BigInteger q = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[0].InnerText));
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BigInteger dp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[0].InnerText));
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BigInteger dq = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[0].InnerText));
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BigInteger qinv = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[0].InnerText));
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RsaPrivateCrtKeyParameters privateKeyParam = new RsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv);
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PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam);
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byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded();
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return Convert.ToBase64String(serializedPrivateBytes);
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}
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/// <summary>
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/// RSA公钥格式转换，.net->java
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/// </summary>
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/// <param name="publicKey">.net生成的公钥</param>
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/// <returns></returns>
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public static string RSAPublicKeyDotNet2Java(string publicKey)
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{
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XmlDocument doc = new XmlDocument();
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doc.LoadXml(publicKey);
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BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
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BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
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RsaKeyParameters pub = new RsaKeyParameters(false, m, p);
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SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub);
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byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
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return Convert.ToBase64String(serializedPublicBytes);
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}
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/// <summary>
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/// RSA私钥格式转换，java->.net
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/// </summary>
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/// <param name="privateKey">java生成的RSA私钥</param>
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/// <returns></returns>
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public static string RSAPrivateKeyJavaToDotNet(string privateKey)
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{
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RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));
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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>",
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Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),
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Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),
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Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),
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Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),
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Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),
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Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),
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Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),
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Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));
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}
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/// <summary>
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/// RSA公钥格式转换，java->.net
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/// </summary>
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/// <param name="publicKey">java生成的公钥</param>
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/// <returns>DotNetPubKey</returns>
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public static string RSAPublicKeyJavaToDotNet(string publicKey)
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{
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RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
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return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
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Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),
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Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));
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}
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/// <summary>
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/// 最大加密长度
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/// </summary>
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private const int MAX_ENCRYPT_BLOCK = 245;
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/// <summary>
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/// 最大解密长度
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/// </summary>
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private const int MAX_DECRYPT_BLOCK = 256;
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/// <summary>
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/// 用私钥给数据进行RSA加密
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/// </summary>
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/// <param name="xmlPrivateKey"></param>
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/// <param name="strEncryptString"></param>
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/// <returns></returns>
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public static string PrivateKeyEncrypt(string xmlPrivateKey, string strEncryptString)
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{
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//加载私钥
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RSACryptoServiceProvider privateRsa = new RSACryptoServiceProvider();
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privateRsa.FromXmlString(xmlPrivateKey);
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//转换密钥
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AsymmetricCipherKeyPair keyPair = DotNetUtilities.GetKeyPair(privateRsa);
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IBufferedCipher c = CipherUtilities.GetCipher("RSA/ECB/PKCS1Padding"); //使用RSA/ECB/PKCS1Padding格式
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c.Init(true, keyPair.Private);//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
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byte[] dataToEncrypt = Encoding.UTF8.GetBytes(strEncryptString);//获取字节
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byte[] cache;
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int time = 0;//次数
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int inputLen = dataToEncrypt.Length;
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int offSet = 0;
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MemoryStream outStream = new MemoryStream();
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while (inputLen - offSet > 0)
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{
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if (inputLen - offSet > MAX_ENCRYPT_BLOCK)
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{
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cache = c.DoFinal(dataToEncrypt, offSet, MAX_ENCRYPT_BLOCK);
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}
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else
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{
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cache = c.DoFinal(dataToEncrypt, offSet, inputLen - offSet);
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}
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//写入
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outStream.Write(cache, 0, cache.Length);
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time++;
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offSet = time * MAX_ENCRYPT_BLOCK;
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}
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byte[] resData = outStream.ToArray();
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string strBase64 = Convert.ToBase64String(resData);
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outStream.Close();
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return strBase64;
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}
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/// <summary>
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/// 用公钥给数据进行RSA解密
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/// </summary>
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/// <param name="xmlPublicKey"> 公钥(XML格式字符串) </param>
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/// <param name="strDecryptString"> 要解密数据 </param>
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/// <returns> 解密后的数据 </returns>
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public static string PublicKeyDecrypt(string xmlPublicKey, string strDecryptString)
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{
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//加载公钥
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RSACryptoServiceProvider publicRsa = new RSACryptoServiceProvider();
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publicRsa.FromXmlString(xmlPublicKey);
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RSAParameters rp = publicRsa.ExportParameters(false);
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//转换密钥
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AsymmetricKeyParameter pbk = DotNetUtilities.GetRsaPublicKey(rp);
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IBufferedCipher c = CipherUtilities.GetCipher("RSA/ECB/PKCS1Padding");
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//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
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c.Init(false, pbk);
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byte[] DataToDecrypt = Convert.FromBase64String(strDecryptString);
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byte[] cache;
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int time = 0;//次数
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int inputLen = DataToDecrypt.Length;
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int offSet = 0;
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MemoryStream outStream = new MemoryStream();
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while (inputLen - offSet > 0)
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{
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if (inputLen - offSet > MAX_DECRYPT_BLOCK)
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{
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cache = c.DoFinal(DataToDecrypt, offSet, MAX_DECRYPT_BLOCK);
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}
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else
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{
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cache = c.DoFinal(DataToDecrypt, offSet, inputLen - offSet);
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}
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//写入
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outStream.Write(cache, 0, cache.Length);
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time++;
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offSet = time * MAX_DECRYPT_BLOCK;
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}
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byte[] resData = outStream.ToArray();
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string strDec = Encoding.UTF8.GetString(resData);
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return strDec;
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}
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/// <summary>
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/// 签名
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/// </summary>
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/// <param name="str">需签名的数据</param>
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/// <returns>签名后的值</returns>
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public static string Sign(string str, string privateKey, SignAlgType signAlgType)
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{
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//根据需要加签时的哈希算法转化成对应的hash字符节
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byte[] bt = Encoding.GetEncoding("utf-8").GetBytes(str);
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byte[] rgbHash = null;
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switch (signAlgType)
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{
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case SignAlgType.SHA256:
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{
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SHA256CryptoServiceProvider csp = new SHA256CryptoServiceProvider();
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rgbHash = csp.ComputeHash(bt);
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}
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break;
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case SignAlgType.MD5:
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{
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MD5CryptoServiceProvider csp = new MD5CryptoServiceProvider();
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rgbHash = csp.ComputeHash(bt);
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}
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break;
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case SignAlgType.SHA1:
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{
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SHA1 csp = new SHA1CryptoServiceProvider();
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rgbHash = csp.ComputeHash(bt);
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}
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break;
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default:
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break;
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}
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RSACryptoServiceProvider key = new RSACryptoServiceProvider();
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key.FromXmlString(privateKey);
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RSAPKCS1SignatureFormatter formatter = new RSAPKCS1SignatureFormatter(key);
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formatter.SetHashAlgorithm(signAlgType.ToString());//此处是你需要加签的hash算法，需要和上边你计算的hash值的算法一致，不然会报错。
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byte[] inArray = formatter.CreateSignature(rgbHash);
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return Convert.ToBase64String(inArray);
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}
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/// <summary>
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/// 签名验证
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/// </summary>
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/// <param name="str">待验证的字符串</param>
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/// <param name="sign">加签之后的字符串</param>
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/// <returns>签名是否符合</returns>
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public static bool Verify(string str, string sign, string publicKey, SignAlgType signAlgType)
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{
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byte[] bt = Encoding.GetEncoding("utf-8").GetBytes(str);
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byte[] rgbHash = null;
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switch (signAlgType)
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{
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case SignAlgType.SHA256:
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{
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SHA256CryptoServiceProvider csp = new SHA256CryptoServiceProvider();
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rgbHash = csp.ComputeHash(bt);
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}
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break;
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case SignAlgType.MD5:
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{
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MD5CryptoServiceProvider csp = new MD5CryptoServiceProvider();
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rgbHash = csp.ComputeHash(bt);
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}
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break;
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case SignAlgType.SHA1:
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{
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SHA1 csp = new SHA1CryptoServiceProvider();
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rgbHash = csp.ComputeHash(bt);
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}
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break;
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default:
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break;
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}
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RSACryptoServiceProvider key = new RSACryptoServiceProvider();
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key.FromXmlString(publicKey);
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RSAPKCS1SignatureDeformatter deformatter = new RSAPKCS1SignatureDeformatter(key);
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deformatter.SetHashAlgorithm(signAlgType.ToString());
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byte[] rgbSignature = Convert.FromBase64String(sign);
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if (deformatter.VerifySignature(rgbHash, rgbSignature))
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return true;
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return false;
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}
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/// <summary>
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/// 签名算法类型
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/// </summary>
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public enum SignAlgType
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{
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/// <summary>
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/// sha256
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/// </summary>
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SHA256,
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/// <summary>
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/// md5
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/// </summary>
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MD5,
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/// <summary>
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/// sha1
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/// </summary>
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SHA1
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}
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}
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}
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