因为C#的RSA加密解密只有公钥加密，私钥解密，没有私钥加密，公钥解密。在网上查了很久也没有很好的实现。BouncyCastle的文档少之又少。很多人可能会说，C#也是可以的，通过Biginteger开源类来实现，不过那个是有一个文章，不过他加密出来的是16进制结果的。根本不能和JAVA互通。连加密出来的都不和C#原生的加密出来的结果格式一样。所以还是没有好的解决方法。
接下来还是不断的找资料，找方法。找朋友找同事。个个都找。问题是有的，方法也是有的，所以总结各路大神之后写了这个类。实现了私钥加密，公钥解密。并通过在线的校验之后，发布上来。大家可以做一个DEMO，然后进去在线RSA加密解密校验。
在线RSA，DES等加密解密地址：
http://tool.chacuo.net/cryptrsapubkey
下面直接粘贴代码，不多说：
BouncyCastle相关DLL，估计不用我多说，大家可以百度下载。然后引用就可以了！
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text; using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Crypto.Encodings; namespace CryptionUtils
{
public class RSAForJava
{ public RSAForJava()
{ }
/// <summary>
/// KEY 结构体
/// </summary>
public struct RSAKEY
{
/// <summary>
/// 公钥
/// </summary>
public string PublicKey
{
get;
set;
}
/// <summary>
/// 私钥
/// </summary>
public string PrivateKey
{
get;
set;
}
}
public RSAKEY GetKey()
{
//RSA密钥对的构造器
RsaKeyPairGenerator keyGenerator = new RsaKeyPairGenerator(); //RSA密钥构造器的参数
RsaKeyGenerationParameters param = new RsaKeyGenerationParameters(
Org.BouncyCastle.Math.BigInteger.ValueOf(),
new Org.BouncyCastle.Security.SecureRandom(),
, //密钥长度
);
//用参数初始化密钥构造器
keyGenerator.Init(param);
//产生密钥对
AsymmetricCipherKeyPair keyPair = keyGenerator.GenerateKeyPair();
//获取公钥和密钥
AsymmetricKeyParameter publicKey = keyPair.Public;
AsymmetricKeyParameter privateKey = keyPair.Private; SubjectPublicKeyInfo subjectPublicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(publicKey);
PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKey); Asn1Object asn1ObjectPublic = subjectPublicKeyInfo.ToAsn1Object(); byte[] publicInfoByte = asn1ObjectPublic.GetEncoded("UTF-8");
Asn1Object asn1ObjectPrivate = privateKeyInfo.ToAsn1Object();
byte[] privateInfoByte = asn1ObjectPrivate.GetEncoded("UTF-8"); RSAKEY item = new RSAKEY()
{
PublicKey =Convert.ToBase64String(publicInfoByte),
PrivateKey=Convert.ToBase64String(privateInfoByte)
};
return item;
}
private AsymmetricKeyParameter GetPublicKeyParameter(string s)
{
s = s.Replace("\r", "").Replace("\n", "").Replace(" ","");
byte[] publicInfoByte = Convert.FromBase64String(s);
Asn1Object pubKeyObj = Asn1Object.FromByteArray(publicInfoByte);//这里也可以从流中读取，从本地导入
AsymmetricKeyParameter pubKey = PublicKeyFactory.CreateKey(publicInfoByte);
return pubKey;
}
private AsymmetricKeyParameter GetPrivateKeyParameter(string s)
{
s = s.Replace("\r", "").Replace("\n", "").Replace(" ", "");
byte[] privateInfoByte = Convert.FromBase64String(s);
// Asn1Object priKeyObj = Asn1Object.FromByteArray(privateInfoByte);//这里也可以从流中读取，从本地导入
// PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKey);
AsymmetricKeyParameter priKey = PrivateKeyFactory.CreateKey(privateInfoByte);
return priKey;
}
public string EncryptByPrivateKey(string s,string key)
{
//非对称加密算法，加解密用
IAsymmetricBlockCipher engine = new Pkcs1Encoding(new RsaEngine()); //加密 try
{
engine.Init(true, GetPrivateKeyParameter(key));
byte[] byteData = System.Text.Encoding.UTF8.GetBytes(s);
var ResultData = engine.ProcessBlock(byteData, , byteData.Length);
return Convert.ToBase64String(ResultData);
//Console.WriteLine("密文（base64编码）:" + Convert.ToBase64String(testData) + Environment.NewLine);
}
catch (Exception ex)
{
return ex.Message; }
}
public string DecryptByPublicKey(string s,string key)
{
s = s.Replace("\r", "").Replace("\n", "").Replace(" ", "");
//非对称加密算法，加解密用
IAsymmetricBlockCipher engine = new Pkcs1Encoding( new RsaEngine()); //解密 try
{
engine.Init(false, GetPublicKeyParameter(key));
byte[] byteData = Convert.FromBase64String(s);
var ResultData = engine.ProcessBlock(byteData, , byteData.Length);
return System.Text.Encoding.UTF8.GetString(ResultData); }
catch (Exception ex)
{
return ex.Message; }
}
}
}