C#下RSA算法的实现（适用于支付宝和易宝支付）
RSA算法代码：
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Security.Cryptography; namespace net.jundie.utils
{
/// <summary>
/// 类名：RSAFromPkcs8
/// 功能：RSA加密、解密、签名、验签
/// 详细：该类对Java生成的密钥进行解密和签名以及验签专用类，不需要修改
/// 版本：3.0
/// 日期：2013-07-08
/// 说明：
/// 以下代码只是为了方便商户测试而提供的样例代码，商户可以根据自己网站的需要，按照技术文档编写,并非一定要使用该代码。
/// </summary>
public sealed class RSAFromPkcs8
{
/// <summary>
/// 签名
/// </summary>
/// <param name="content">待签名字符串</param>
/// <param name="privateKey">私钥</param>
/// <param name="input_charset">编码格式</param>
/// <returns>签名后字符串</returns>
public static string sign(string content, string privateKey, string input_charset)
{
byte[] Data = Encoding.GetEncoding(input_charset).GetBytes(content);
RSACryptoServiceProvider rsa = DecodePemPrivateKey(privateKey);
//MD5 sh = new MD5CryptoServiceProvider();//这里也可以使用MD5加密方式
SHA1 sh = new SHA1CryptoServiceProvider();
byte[] signData = rsa.SignData(Data, sh);
return Convert.ToBase64String(signData);
} /// <summary>
/// 验签
/// </summary>
/// <param name="content">待验签字符串</param>
/// <param name="signedString">签名</param>
/// <param name="publicKey">公钥</param>
/// <param name="input_charset">编码格式</param>
/// <returns>true(通过)，false(不通过)</returns>
public static bool verify(string content, string signedString, string publicKey, string input_charset)
{
bool result = false;
byte[] Data = Encoding.GetEncoding(input_charset).GetBytes(content);
byte[] data = Convert.FromBase64String(signedString);
RSAParameters paraPub = ConvertFromPublicKey(publicKey);
RSACryptoServiceProvider rsaPub = new RSACryptoServiceProvider();
rsaPub.ImportParameters(paraPub);
//MD5 sh = new MD5CryptoServiceProvider();//这里可以使用MD5加密方式
SHA1 sh = new SHA1CryptoServiceProvider();
result = rsaPub.VerifyData(Data, sh, data);
return result;
} /// <summary>
/// 加密
/// </summary>
/// <param name="resData">需要加密的字符串</param>
/// <param name="publicKey">公钥</param>
/// <param name="input_charset">编码格式</param>
/// <returns>明文</returns>
public static string encryptData(string resData, string publicKey, string input_charset)
{
byte[] DataToEncrypt = Encoding.GetEncoding(input_charset).GetBytes(resData);
string result = encrypt(DataToEncrypt, publicKey, input_charset);
return result;
} /// <summary>
/// 解密
/// </summary>
/// <param name="resData">加密字符串</param>
/// <param name="privateKey">私钥</param>
/// <param name="input_charset">编码格式</param>
/// <returns>明文</returns>
public static string decryptData(string resData, string privateKey, string input_charset)
{
byte[] DataToDecrypt = Convert.FromBase64String(resData);
string result = "";
for (int j = ; j < DataToDecrypt.Length / ; j++)
{
byte[] buf = new byte[];
for (int i = ; i < ; i++)
{ buf[i] = DataToDecrypt[i + * j];
}
result += decrypt(buf, privateKey, input_charset);
}
return result;
} #region 内部方法 private static string encrypt(byte[] data, string publicKey, string input_charset)
{
RSACryptoServiceProvider rsa = DecodePemPublicKey(publicKey);
//MD5 sh = new MD5CryptoServiceProvider();//这里也可以使用MD5加密方式
SHA1 sh = new SHA1CryptoServiceProvider();
byte[] result = rsa.Encrypt(data, false); return Convert.ToBase64String(result);
} private static string decrypt(byte[] data, string privateKey, string input_charset)
{
string result = "";
RSACryptoServiceProvider rsa = DecodePemPrivateKey(privateKey);
//MD5 sh = new MD5CryptoServiceProvider();//这里也可以替换使用MD5方式
SHA1 sh = new SHA1CryptoServiceProvider();
byte[] source = rsa.Decrypt(data, false);
char[] asciiChars = new char[Encoding.GetEncoding(input_charset).GetCharCount(source, , source.Length)];
Encoding.GetEncoding(input_charset).GetChars(source, , source.Length, asciiChars, );
result = new string(asciiChars);
//result = ASCIIEncoding.ASCII.GetString(source);
return result;
} private static RSACryptoServiceProvider DecodePemPublicKey(String pemstr)
{
byte[] pkcs8publickkey;
pkcs8publickkey = Convert.FromBase64String(pemstr);
if (pkcs8publickkey != null)
{
RSACryptoServiceProvider rsa = DecodeRSAPublicKey(pkcs8publickkey);
return rsa;
}
else
return null;
} private static RSACryptoServiceProvider DecodePemPrivateKey(String pemstr)
{
byte[] pkcs8privatekey;
pkcs8privatekey = Convert.FromBase64String(pemstr);
if (pkcs8privatekey != null)
{
RSACryptoServiceProvider rsa = DecodePrivateKeyInfo(pkcs8privatekey);
return rsa;
}
else
return null;
} private static RSACryptoServiceProvider DecodePrivateKeyInfo(byte[] pkcs8)
{
byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 };
byte[] seq = new byte[]; MemoryStream mem = new MemoryStream(pkcs8);
int lenstream = (int)mem.Length;
BinaryReader binr = new BinaryReader(mem); //wrap Memory Stream with BinaryReader for easy reading
byte bt = ;
ushort twobytes = ; try
{
twobytes = binr.ReadUInt16();
if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81)
binr.ReadByte(); //advance 1 byte
else if (twobytes == 0x8230)
binr.ReadInt16(); //advance 2 bytes
else
return null; bt = binr.ReadByte();
if (bt != 0x02)
return null; twobytes = binr.ReadUInt16(); if (twobytes != 0x0001)
return null; seq = binr.ReadBytes(); //read the Sequence OID
if (!CompareBytearrays(seq, SeqOID)) //make sure Sequence for OID is correct
return null; bt = binr.ReadByte();
if (bt != 0x04) //expect an Octet string
return null; bt = binr.ReadByte(); //read next byte, or next 2 bytes is 0x81 or 0x82; otherwise bt is the byte count
if (bt == 0x81)
binr.ReadByte();
else
if (bt == 0x82)
binr.ReadUInt16();
//------ at this stage, the remaining sequence should be the RSA private key byte[] rsaprivkey = binr.ReadBytes((int)(lenstream - mem.Position));
RSACryptoServiceProvider rsacsp = DecodeRSAPrivateKey(rsaprivkey);
return rsacsp;
} catch (Exception)
{
return null;
} finally { binr.Close(); } } private static bool CompareBytearrays(byte[] a, byte[] b)
{
if (a.Length != b.Length)
return false;
int i = ;
foreach (byte c in a)
{
if (c != b[i])
return false;
i++;
}
return true;
} private static RSACryptoServiceProvider DecodeRSAPublicKey(byte[] publickey)
{
// encoded OID sequence for PKCS #1 rsaEncryption szOID_RSA_RSA = "1.2.840.113549.1.1.1"
byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 };
byte[] seq = new byte[];
// --------- Set up stream to read the asn.1 encoded SubjectPublicKeyInfo blob ------
MemoryStream mem = new MemoryStream(publickey);
BinaryReader binr = new BinaryReader(mem); //wrap Memory Stream with BinaryReader for easy reading
byte bt = ;
ushort twobytes = ; try
{ twobytes = binr.ReadUInt16();
if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81)
binr.ReadByte(); //advance 1 byte
else if (twobytes == 0x8230)
binr.ReadInt16(); //advance 2 bytes
else
return null; seq = binr.ReadBytes(); //read the Sequence OID
if (!CompareBytearrays(seq, SeqOID)) //make sure Sequence for OID is correct
return null; twobytes = binr.ReadUInt16();
if (twobytes == 0x8103) //data read as little endian order (actual data order for Bit String is 03 81)
binr.ReadByte(); //advance 1 byte
else if (twobytes == 0x8203)
binr.ReadInt16(); //advance 2 bytes
else
return null; bt = binr.ReadByte();
if (bt != 0x00) //expect null byte next
return null; twobytes = binr.ReadUInt16();
if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81)
binr.ReadByte(); //advance 1 byte
else if (twobytes == 0x8230)
binr.ReadInt16(); //advance 2 bytes
else
return null; twobytes = binr.ReadUInt16();
byte lowbyte = 0x00;
byte highbyte = 0x00; if (twobytes == 0x8102) //data read as little endian order (actual data order for Integer is 02 81)
lowbyte = binr.ReadByte(); // read next bytes which is bytes in modulus
else if (twobytes == 0x8202)
{
highbyte = binr.ReadByte(); //advance 2 bytes
lowbyte = binr.ReadByte();
}
else
return null;
byte[] modint = { lowbyte, highbyte, 0x00, 0x00 }; //reverse byte order since asn.1 key uses big endian order
int modsize = BitConverter.ToInt32(modint, ); byte firstbyte = binr.ReadByte();
binr.BaseStream.Seek(-, SeekOrigin.Current); if (firstbyte == 0x00)
{ //if first byte (highest order) of modulus is zero, don't include it
binr.ReadByte(); //skip this null byte
modsize -= ; //reduce modulus buffer size by 1
} byte[] modulus = binr.ReadBytes(modsize); //read the modulus bytes if (binr.ReadByte() != 0x02) //expect an Integer for the exponent data
return null;
int expbytes = (int)binr.ReadByte(); // should only need one byte for actual exponent data (for all useful values)
byte[] exponent = binr.ReadBytes(expbytes); // ------- create RSACryptoServiceProvider instance and initialize with public key -----
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSAParameters RSAKeyInfo = new RSAParameters();
RSAKeyInfo.Modulus = modulus;
RSAKeyInfo.Exponent = exponent;
RSA.ImportParameters(RSAKeyInfo);
return RSA;
}
catch (Exception)
{
return null;
} finally { binr.Close(); } } private static RSACryptoServiceProvider DecodeRSAPrivateKey(byte[] privkey)
{
byte[] MODULUS, E, D, P, Q, DP, DQ, IQ; // --------- Set up stream to decode the asn.1 encoded RSA private key ------
MemoryStream mem = new MemoryStream(privkey);
BinaryReader binr = new BinaryReader(mem); //wrap Memory Stream with BinaryReader for easy reading
byte bt = ;
ushort twobytes = ;
int elems = ;
try
{
twobytes = binr.ReadUInt16();
if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81)
binr.ReadByte(); //advance 1 byte
else if (twobytes == 0x8230)
binr.ReadInt16(); //advance 2 bytes
else
return null; twobytes = binr.ReadUInt16();
if (twobytes != 0x0102) //version number
return null;
bt = binr.ReadByte();
if (bt != 0x00)
return null; //------ all private key components are Integer sequences ----
elems = GetIntegerSize(binr);
MODULUS = binr.ReadBytes(elems); elems = GetIntegerSize(binr);
E = binr.ReadBytes(elems); elems = GetIntegerSize(binr);
D = binr.ReadBytes(elems); elems = GetIntegerSize(binr);
P = binr.ReadBytes(elems); elems = GetIntegerSize(binr);
Q = binr.ReadBytes(elems); elems = GetIntegerSize(binr);
DP = binr.ReadBytes(elems); elems = GetIntegerSize(binr);
DQ = binr.ReadBytes(elems); elems = GetIntegerSize(binr);
IQ = binr.ReadBytes(elems); // ------- create RSACryptoServiceProvider instance and initialize with public key -----
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSAParameters RSAparams = new RSAParameters();
RSAparams.Modulus = MODULUS;
RSAparams.Exponent = E;
RSAparams.D = D;
RSAparams.P = P;
RSAparams.Q = Q;
RSAparams.DP = DP;
RSAparams.DQ = DQ;
RSAparams.InverseQ = IQ;
RSA.ImportParameters(RSAparams);
return RSA;
}
catch (Exception)
{
return null;
}
finally { binr.Close(); }
} private static int GetIntegerSize(BinaryReader binr)
{
byte bt = ;
byte lowbyte = 0x00;
byte highbyte = 0x00;
int count = ;
bt = binr.ReadByte();
if (bt != 0x02) //expect integer
return ;
bt = binr.ReadByte(); if (bt == 0x81)
count = binr.ReadByte(); // data size in next byte
else
if (bt == 0x82)
{
highbyte = binr.ReadByte(); // data size in next 2 bytes
lowbyte = binr.ReadByte();
byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };
count = BitConverter.ToInt32(modint, );
}
else
{
count = bt; // we already have the data size
} while (binr.ReadByte() == 0x00)
{ //remove high order zeros in data
count -= ;
}
binr.BaseStream.Seek(-, SeekOrigin.Current); //last ReadByte wasn't a removed zero, so back up a byte
return count;
} #endregion #region 解析.net 生成的Pem
private static RSAParameters ConvertFromPublicKey(string pemFileConent)
{ byte[] keyData = Convert.FromBase64String(pemFileConent);
if (keyData.Length < )
{
throw new ArgumentException("pem file content is incorrect.");
}
byte[] pemModulus = new byte[];
byte[] pemPublicExponent = new byte[];
Array.Copy(keyData, , pemModulus, , );
Array.Copy(keyData, , pemPublicExponent, , );
RSAParameters para = new RSAParameters();
para.Modulus = pemModulus;
para.Exponent = pemPublicExponent;
return para;
} private static RSAParameters ConvertFromPrivateKey(string pemFileConent)
{
byte[] keyData = Convert.FromBase64String(pemFileConent);
if (keyData.Length < )
{
throw new ArgumentException("pem file content is incorrect.");
} int index = ;
byte[] pemModulus = new byte[];
Array.Copy(keyData, index, pemModulus, , ); index += ;
index += ;//
byte[] pemPublicExponent = new byte[];
Array.Copy(keyData, index, pemPublicExponent, , ); index += ;
index += ;//
byte[] pemPrivateExponent = new byte[];
Array.Copy(keyData, index, pemPrivateExponent, , ); index += ;
index += ((int)keyData[index + ] == ? : );//
byte[] pemPrime1 = new byte[];
Array.Copy(keyData, index, pemPrime1, , ); index += ;
index += ((int)keyData[index + ] == ? : );//
byte[] pemPrime2 = new byte[];
Array.Copy(keyData, index, pemPrime2, , ); index += ;
index += ((int)keyData[index + ] == ? : );//412/413
byte[] pemExponent1 = new byte[];
Array.Copy(keyData, index, pemExponent1, , ); index += ;
index += ((int)keyData[index + ] == ? : );//479/480
byte[] pemExponent2 = new byte[];
Array.Copy(keyData, index, pemExponent2, , ); index += ;
index += ((int)keyData[index + ] == ? : );//545/546
byte[] pemCoefficient = new byte[];
Array.Copy(keyData, index, pemCoefficient, , ); RSAParameters para = new RSAParameters();
para.Modulus = pemModulus;
para.Exponent = pemPublicExponent;
para.D = pemPrivateExponent;
para.P = pemPrime1;
para.Q = pemPrime2;
para.DP = pemExponent1;
para.DQ = pemExponent2;
para.InverseQ = pemCoefficient;
return para;
}
#endregion }
}
RSA算法测试代码：
using System;
using System.Collections.Generic;
using System.Text;
using RSA.Class; namespace net.jundie.rsa_demo
{
class TestRSA
{
static void Main(string[] arg)
{ /**RSA加密测试,RSA中的密钥对通过SSL工具生成，生成命令如下：
* 1 生成RSA私钥：
* openssl genrsa -out rsa_private_key.pem 1024
*2 生成RSA公钥
* openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
*
* 3 将RSA私钥转换成PKCS8格式
* openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt -out rsa_pub_pk8.pem
*
* 直接打开rsa_private_key.pem和rsa_pub_pk8.pem文件就可以获取密钥对内容，获取密钥对内容组成字符串时，注意将换行符删除
* */ string publickey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDzOqfNunFxFtCZPlq7fO/jWwjqmTvAooVBB4y87BizSZ9dl/F7FpAxYc6MmX2TqivCvvORXgdlYdFWAhzXOnIUv9OGG///WPLe9TMs9kIwAZ/APUXauvC01oFLnYkzwPlAh0tQ1Au9arTE/OG1V1dKgf8BXHLPhKL4BmGBEUZBtQIDAQAB";
string privatekey = "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"; //加密字符串
string data = "yibao"; Console.WriteLine("加密前字符串内容："+data);
//加密
string encrypteddata = RSAFromPkcs8.encryptData(data, publickey, "UTF-8");
Console.WriteLine("加密后的字符串为：" + encrypteddata);
Console.WriteLine("解密后的字符串内容：" + RSAFromPkcs8.decryptData(encrypteddata, privatekey, "UTF-8")); Console.WriteLine("***********"); //解密
string endata = "LpnnvnfA72VnyjboX/OsCPO6FOFXeEnnsKkI7aAEQyVAPfCTfQ43ZYVZVqnADDPMW7VhBXJWyQMAGw2Fh9sS/XLHmO5XW94Yehci6JrJMynePgtIiDysjNA+UlgSTC/MlResNrBm/4MMSPvq0qLwScgpZDynhLsVZk+EQ6G8wgA=";
string datamw = RSAFromPkcs8.decryptData(endata, privatekey, "UTF-8");
Console.WriteLine("静态加密后的字符串为：" + endata);
Console.WriteLine("解密后的字符串内容：" + datamw); //签名
string signdata = "YB010000001441234567286038508081299";
Console.WriteLine("签名前的字符串内容：" + signdata);
string sign = RSAFromPkcs8.sign(signdata, privatekey, "UTF-8");
Console.WriteLine("签名后的字符串：" + sign); Console.ReadLine();
}
}
}
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