最近在进行支付系统的开发，其中遇到了一些平台是RSA算法进行加密解密和签名进行通讯、因为2个平台之间的区别采了不少坑，特地记录一下。
一、 算法依赖于 Org.BouncyCastle包，首先选择自己的项目，右键点击管理“NuGet程序包”.
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二、搜索“BouncyCastle”，下载最多的就是啦。
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三、下面是加密解密类，直接引入系统即可
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Encodings;
using Org.BouncyCastle.Crypto;
namespace My.Common
{
/// <summary>
/// 加密工具类
/// </summary>
public static class EncryUtils
{
/// <summary>
/// RSAJava私钥转换
/// </summary>
/// <param name="privateKey"></param>
/// <returns></returns>
public static string RSAPrivateKeyJava2DotNet(string privateKey)
{
if (!string.IsNullOrEmpty(privateKey))
{
privateKey = privateKey.Trim().Replace(" ", "");
}
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())
);
}
/// <summary>
/// RSAJava公钥转换
/// </summary>
/// <param name="publicKey"></param>
/// <returns></returns>
public static string RSAPublicKeyJava2DotNet(string publicKey)
{
if (!string.IsNullOrEmpty(publicKey))
{
publicKey = publicKey.Trim().Replace(" ", "");
}
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>
/// 用公钥对数据加密（使用私钥也可以）
/// </summary>
/// <param name="message">需要加密的字符串</param>
/// <param name="pubilcKey">公钥加密</param>
/// <returns></returns>
public static string RSAEncryptByPublicKey(string message, string pubilcKey)
{
//保存明文文件的字节数组
Byte[] PlaintextData = Encoding.UTF8.GetBytes(message);
RSACryptoServiceProvider RSACryptography = new RSACryptoServiceProvider();
RSACryptography.FromXmlString(pubilcKey);
int MaxBlockSize = RSACryptography.KeySize / 8 - 11; //加密块最大长度限制
if (PlaintextData.Length <= MaxBlockSize)
return Convert.ToBase64String(RSACryptography.Encrypt(PlaintextData, false));
using (MemoryStream PlaiStream = new MemoryStream(PlaintextData))
using (MemoryStream CrypStream = new MemoryStream())
{
Byte[] Buffer = new Byte[MaxBlockSize];
int BlockSize = PlaiStream.Read(Buffer, 0, MaxBlockSize);
while (BlockSize > 0)
{
Byte[] ToEncrypt = new Byte[BlockSize];
Array.Copy(Buffer, 0, ToEncrypt, 0, BlockSize);
Byte[] Cryptograph = RSACryptography.Encrypt(ToEncrypt, false);
CrypStream.Write(Cryptograph, 0, Cryptograph.Length);
BlockSize = PlaiStream.Read(Buffer, 0, MaxBlockSize);
}
return Convert.ToBase64String(CrypStream.ToArray(), Base64FormattingOptions.None);
}
}
/// <summary>
/// 使用公钥对数据解密（使用私钥也可以）
/// </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")
{
if (string.IsNullOrEmpty(publicKeyJava))
{
return string.Empty;
}
if (string.IsNullOrEmpty(data))
{
return string.Empty;
}
RsaKeyParameters rsaKeyParameters = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKeyJava));
byte[] dataToDecrypt = Convert.FromBase64String(data);
IAsymmetricBlockCipher rsaEngine = new RsaEngine();
rsaEngine = new Pkcs1Encoding(rsaEngine); // 这里是指定PCK1算法，如果是其他的算法请自行替换
rsaEngine.Init(false, rsaKeyParameters);
string result = "";
for (int j = 0; j < dataToDecrypt.Length / 128; j++)
{
byte[] buf = new byte[128];
for (int i = 0; i < 128; i++)
{
buf[i] = dataToDecrypt[i + 128 * j];
}
buf = rsaEngine.ProcessBlock(buf, 0, buf.Length);
char[] asciiChars = new char[Encoding.GetEncoding(encoding).GetCharCount(buf, 0, buf.Length)];
Encoding.GetEncoding(encoding).GetChars(buf, 0, buf.Length, asciiChars, 0);
result += new string(asciiChars);
}
return result;
}
/// <summary>
/// RSA私钥签名算法
/// </summary>
/// <param name="content"></param>
/// <param name="privateKey"></param>
/// <returns></returns>
public static string RSASignByPrivateKey(string content, string privateKey)
{
RSACryptoServiceProvider rsaCsp = new RSACryptoServiceProvider();
rsaCsp.FromXmlString(privateKey);
byte[] dataBytes = Encoding.UTF8.GetBytes(content);
byte[] signatureBytes = rsaCsp.SignData(dataBytes, "SHA1");
return Convert.ToBase64String(signatureBytes);
}
/// <summary>
/// RSA公钥签名算法
/// </summary>
/// <param name="content"></param>
/// <param name="publicKey"></param>
/// <param name="sign"></param>
/// <returns></returns>
public static bool RsaVerifyByPublicKey(string content, string publicKey,string sign)
{
RSACryptoServiceProvider rsaCsp = new RSACryptoServiceProvider();
rsaCsp.FromXmlString(publicKey);
//将base64签名数据转码为字节
byte[] orgin = Encoding.UTF8.GetBytes(content);
byte[] signedBase64 = Convert.FromBase64String(sign);
bool bVerify = rsaCsp.VerifyData(orgin, "SHA1", signedBase64);
return bVerify;
}
}
}
使用方法
1、使用EncryUtils.RSAPrivateKeyJava2DotNet 或者 EncryUtils.RSAPublicKeyJava2DotNet 方法。将JAVA的RSA密钥换转换为NET的密钥格式。
2、使用转换后的密钥进行加密，解密，签名等操作。
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