这个也是和java版本的加密对比过了，结果是一样的，且不用像用c#自带的rsa加密一样先转换一遍密钥，不多比比，直接上代码：
using Org.BouncyCastle.Crypto; using Org.BouncyCastle.Crypto.Engines; using Org.BouncyCastle.Crypto.Parameters; using Org.BouncyCastle.Security; using System;using System.Text; public class RSAUtil { #region 私钥加密 /// <summary> /// 基于BouncyCastle的RSA私钥加密 /// </summary> /// <param name="privateKeyJava"></param> /// <param name="data"></param> /// <returns></returns> public static string EncryptPrivateKeyJava(string privateKeyJava, string data, string encoding = "UTF-8") { RsaKeyParameters privateKeyParam = (RsaKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKeyJava)); byte[] cipherbytes = Encoding.GetEncoding(encoding).GetBytes(data); RsaEngine rsa = new RsaEngine(); rsa.Init(true, privateKeyParam);//参数true表示加密/false表示解密。 cipherbytes = rsa.ProcessBlock(cipherbytes, 0, cipherbytes.Length); return Convert.ToBase64String(cipherbytes); } #endregion #region 公钥解密 /// <summary> /// 基于BouncyCastle的RSA公钥解密 /// </summary> /// <param name="publicKeyJava"></param> /// <param name="data"></param> /// <param name="encoding"></param> /// <returns></returns> public static string DecryptPublicKeyJava(string publicKeyJava, string data, string encoding = "UTF-8") { RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKeyJava)); byte[] cipherbytes = Convert.FromBase64String(data); RsaEngine rsa = new RsaEngine(); rsa.Init(false, publicKeyParam);//参数true表示加密/false表示解密。 cipherbytes = rsa.ProcessBlock(cipherbytes, 0, cipherbytes.Length); return Encoding.GetEncoding(encoding).GetString(cipherbytes); } #endregion #region 加签 /// <summary> /// 基于BouncyCastle的RSA签名 /// </summary> /// <param name="data"></param> /// <param name="privateKeyJava"></param> /// <param name="hashAlgorithm">JAVA的和.NET的不一样，如：MD5(.NET)等同于MD5withRSA(JAVA)</param> /// <param name="encoding"></param> /// <param name="mode">模式，true是验签，false是加签</param> /// <returns></returns> public static string RSASignJavaBouncyCastle(string data, string privateKeyJava, string hashAlgorithm = "MD5withRSA", string encoding = "UTF-8") { RsaKeyParameters privateKeyParam = (RsaKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKeyJava)); ISigner signer = SignerUtilities.GetSigner(hashAlgorithm); signer.Init(true, privateKeyParam);//参数为false验签，参数为true加签 var dataByte = Encoding.GetEncoding(encoding).GetBytes(data); signer.BlockUpdate(dataByte, 0, dataByte.Length); //return Encoding.GetEncoding(encoding).GetString(signer.GenerateSignature()); //签名结果 非Base64String return Convert.ToBase64String(signer.GenerateSignature()); } #endregion #region 验签 /// <summary> /// 基于BouncyCastle的RSA签名 /// </summary> /// <param name="data">源数据</param> /// <param name="publicKeyJava"></param> /// <param name="signature">base64签名</param> /// <param name="hashAlgorithm">JAVA的和.NET的不一样，如：MD5(.NET)等同于MD5withRSA(JAVA)</param> /// <param name="encoding"></param> /// <returns></returns> public static bool VerifyJavaBouncyCastle(string data, string publicKeyJava, string signature, string hashAlgorithm = "MD5withRSA", string encoding = "UTF-8") { RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKeyJava)); ISigner signer = SignerUtilities.GetSigner(hashAlgorithm); signer.Init(false, publicKeyParam); byte[] dataByte = Encoding.GetEncoding(encoding).GetBytes(data); signer.BlockUpdate(dataByte, 0, dataByte.Length); byte[] signatureByte = Convert.FromBase64String(signature); return signer.VerifySignature(signatureByte); } #endregion }
有一点要注意，使用之前要装个”BouncyCastle的“包，在nuget中安装