RSA加密解密及RSA签名和验证

1.RSA加密解密：
　(1)获取密钥，这里是产生密钥，实际应用中可以从各种存储介质上读取密钥 (2)加密 (3)解密
2.RSA签名和验证
　(1)获取密钥，这里是产生密钥，实际应用中可以从各种存储介质上读取密钥 (2)获取待签名的Hash码 (3)获取签名的字符串 (4)验证

3.公钥与私钥的理解：
　(1)私钥用来进行解密和签名，是给自己用的。
　(2)公钥由本人公开，用于加密和验证签名，是给别人用的。
(3)当该用户发送文件时，用私钥签名，别人用他给的公钥验证签名，可以保证该信息是由他发送的。当该用户接受文件时，别人用他的公钥加密，他用私钥解密，可以保证该信息只能由他接收到。

class RSACryption
{
#region RSA 加密解密

#region RSA 的密钥产生
/// <summary>
/// RSA产生密钥
/// </summary>
/// <param name="xmlKeys">私钥</param>
/// <param name="xmlPublicKey">公钥</param>
public void RSAKey(out string xmlKeys, out string xmlPublicKey)
{
try
{
System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
xmlKeys = rsa.ToXmlString(true);
xmlPublicKey = rsa.ToXmlString(false);
}
catch (Exception ex)
{
throw ex;
}
}
#endregion

#region RSA加密函数
//##############################################################################
//RSA 方式加密
//KEY必须是XML的形式,返回的是字符串
//该加密方式有长度限制的！
//##############################################################################

/// <summary>
/// RSA的加密函数
/// </summary>
/// <param name="xmlPublicKey">公钥</param>
/// <param name="encryptString">待加密的字符串</param>
/// <returns></returns>
public string RSAEncrypt(string xmlPublicKey, string encryptString)
{
try
{
byte[] PlainTextBArray;
byte[] CypherTextBArray;
string Result;
System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.FromXmlString(xmlPublicKey);
PlainTextBArray = (new UnicodeEncoding()).GetBytes(encryptString);
CypherTextBArray = rsa.Encrypt(PlainTextBArray, false);
Result = Convert.ToBase64String(CypherTextBArray);
return Result;
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// RSA的加密函数
/// </summary>
/// <param name="xmlPublicKey">公钥</param>
/// <param name="EncryptString">待加密的字节数组</param>
/// <returns></returns>
public string RSAEncrypt(string xmlPublicKey, byte[] EncryptString)
{
try
{
byte[] CypherTextBArray;
string Result;
System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.FromXmlString(xmlPublicKey);
CypherTextBArray = rsa.Encrypt(EncryptString, false);
Result = Convert.ToBase64String(CypherTextBArray);
return Result;
}
catch (Exception ex)
{
throw ex;
}
}
#endregion

#region RSA的解密函数
/// <summary>
/// RSA的解密函数
/// </summary>
/// <param name="xmlPrivateKey">私钥</param>
/// <param name="decryptString">待解密的字符串</param>
/// <returns></returns>
public string RSADecrypt(string xmlPrivateKey, string decryptString)
{
try
{
byte[] PlainTextBArray;
byte[] DypherTextBArray;
string Result;
System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.FromXmlString(xmlPrivateKey);
PlainTextBArray = Convert.FromBase64String(decryptString);
DypherTextBArray = rsa.Decrypt(PlainTextBArray, false);
Result = (new UnicodeEncoding()).GetString(DypherTextBArray);
return Result;
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// RSA的解密函数
/// </summary>
/// <param name="xmlPrivateKey">私钥</param>
/// <param name="DecryptString">待解密的字节数组</param>
/// <returns></returns>
public string RSADecrypt(string xmlPrivateKey, byte[] DecryptString)
{
try
{
byte[] DypherTextBArray;
string Result;
System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.FromXmlString(xmlPrivateKey);
DypherTextBArray = rsa.Decrypt(DecryptString, false);
Result = (new UnicodeEncoding()).GetString(DypherTextBArray);
return Result;
}
catch (Exception ex)
{
throw ex;
}
}
#endregion

#endregion

#region RSA数字签名

#region 获取Hash描述表
/// <summary>
/// 获取Hash描述表
/// </summary>
/// <param name="strSource">待签名的字符串</param>
/// <param name="HashData">Hash描述</param>
/// <returns></returns>
public bool GetHash(string strSource, ref byte[] HashData)
{
try
{
byte[] Buffer;
System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
Buffer = System.Text.Encoding.GetEncoding("GB2312").GetBytes(strSource);
HashData = MD5.ComputeHash(Buffer);
return true;
}
catch (Exception ex)
{
throw ex;
}
}

/// <summary>
/// 获取Hash描述表
/// </summary>
/// <param name="strSource">待签名的字符串</param>
/// <param name="strHashData">Hash描述</param>
/// <returns></returns>
public bool GetHash(string strSource, ref string strHashData)
{
try
{
//从字符串中取得Hash描述
byte[] Buffer;
byte[] HashData;
System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
Buffer = System.Text.Encoding.GetEncoding("GB2312").GetBytes(strSource);
HashData = MD5.ComputeHash(Buffer);
strHashData = Convert.ToBase64String(HashData);
return true;
}
catch (Exception ex)
{
throw ex;
}
}

/// <summary>
/// 获取Hash描述表
/// </summary>
/// <param name="objFile">待签名的文件</param>
/// <param name="HashData">Hash描述</param>
/// <returns></returns>
public bool GetHash(System.IO.FileStream objFile, ref byte[] HashData)
{
try
{
//从文件中取得Hash描述
System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
HashData = MD5.ComputeHash(objFile);
objFile.Close();
return true;
}
catch (Exception ex)
{
throw ex;
}
}

/// <summary>
/// 获取Hash描述表
/// </summary>
/// <param name="objFile">待签名的文件</param>
/// <param name="strHashData">Hash描述</param>
/// <returns></returns>
public bool GetHash(System.IO.FileStream objFile, ref string strHashData)
{
try
{
//从文件中取得Hash描述
byte[] HashData;
System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
HashData = MD5.ComputeHash(objFile);
objFile.Close();
strHashData = Convert.ToBase64String(HashData);
return true;
}
catch (Exception ex)
{
throw ex;
}
}
#endregion

#region RSA签名
/// <summary>
/// RSA签名
/// </summary>
/// <param name="strKeyPrivate">私钥</param>
/// <param name="HashbyteSignature">待签名Hash描述</param>
/// <param name="EncryptedSignatureData">签名后的结果</param>
/// <returns></returns>
public bool SignatureFormatter(string strKeyPrivate, byte[] HashbyteSignature, ref byte[] EncryptedSignatureData)
{
try
{
System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

RSA.FromXmlString(strKeyPrivate);
System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
//设置签名的算法为MD5
RSAFormatter.SetHashAlgorithm("MD5");
//执行签名
EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
return true;
}
catch (Exception ex)
{
throw ex;
}
}

/// <summary>
/// RSA签名
/// </summary>
/// <param name="strKeyPrivate">私钥</param>
/// <param name="HashbyteSignature">待签名Hash描述</param>
/// <param name="m_strEncryptedSignatureData">签名后的结果</param>
/// <returns></returns>
public bool SignatureFormatter(string strKeyPrivate, byte[] HashbyteSignature, ref string strEncryptedSignatureData)
{
try
{
byte[] EncryptedSignatureData;
System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
RSA.FromXmlString(strKeyPrivate);
System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
//设置签名的算法为MD5
RSAFormatter.SetHashAlgorithm("MD5");
//执行签名
EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);
return true;
}
catch (Exception ex)
{
throw ex;
}
}

/// <summary>
/// RSA签名
/// </summary>
/// <param name="strKeyPrivate">私钥</param>
/// <param name="strHashbyteSignature">待签名Hash描述</param>
/// <param name="EncryptedSignatureData">签名后的结果</param>
/// <returns></returns>
public bool SignatureFormatter(string strKeyPrivate, string strHashbyteSignature, ref byte[] EncryptedSignatureData)
{
try
{
byte[] HashbyteSignature;

HashbyteSignature = Convert.FromBase64String(strHashbyteSignature);
System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

RSA.FromXmlString(strKeyPrivate);
System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
//设置签名的算法为MD5
RSAFormatter.SetHashAlgorithm("MD5");
//执行签名
EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);

return true;
}
catch (Exception ex)
{
throw ex;
}
}

/// <summary>
/// RSA签名
/// </summary>
/// <param name="strKeyPrivate">私钥</param>
/// <param name="strHashbyteSignature">待签名Hash描述</param>
/// <param name="strEncryptedSignatureData">签名后的结果</param>
/// <returns></returns>
public bool SignatureFormatter(string strKeyPrivate, string strHashbyteSignature, ref string strEncryptedSignatureData)
{
try
{
byte[] HashbyteSignature;
byte[] EncryptedSignatureData;
HashbyteSignature = Convert.FromBase64String(strHashbyteSignature);
System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
RSA.FromXmlString(strKeyPrivate);
System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
//设置签名的算法为MD5
RSAFormatter.SetHashAlgorithm("MD5");
//执行签名
EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);
return true;
}
catch (Exception ex)
{
throw ex;
}
}
#endregion

#region RSA 签名验证
/// <summary>
/// RSA签名验证
/// </summary>
/// <param name="strKeyPublic">公钥</param>
/// <param name="HashbyteDeformatter">Hash描述</param>
/// <param name="DeformatterData">签名后的结果</param>
/// <returns></returns>
public bool SignatureDeformatter(string strKeyPublic, byte[] HashbyteDeformatter, byte[] DeformatterData)
{
try
{
System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
RSA.FromXmlString(strKeyPublic);
System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
//指定解密的时候HASH算法为MD5
RSADeformatter.SetHashAlgorithm("MD5");
if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
{
return true;
}
else
{
return false;
}
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// RSA签名验证
/// </summary>
/// <param name="strKeyPublic">公钥</param>
/// <param name="strHashbyteDeformatter">Hash描述</param>
/// <param name="DeformatterData">签名后的结果</param>
/// <returns></returns>
public bool SignatureDeformatter(string strKeyPublic, string strHashbyteDeformatter, byte[] DeformatterData)
{
try
{
byte[] HashbyteDeformatter;
HashbyteDeformatter = Convert.FromBase64String(strHashbyteDeformatter);
System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
RSA.FromXmlString(strKeyPublic);
System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
//指定解密的时候HASH算法为MD5
RSADeformatter.SetHashAlgorithm("MD5");
if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
{
return true;
}
else
{
return false;
}
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// RSA签名验证
/// </summary>
/// <param name="strKeyPublic">公钥</param>
/// <param name="HashbyteDeformatter">Hash描述</param>
/// <param name="strDeformatterData">签名后的结果</param>
/// <returns></returns>
public bool SignatureDeformatter(string strKeyPublic, byte[] HashbyteDeformatter, string strDeformatterData)
{
try
{
byte[] DeformatterData;
System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
RSA.FromXmlString(strKeyPublic);
System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
//指定解密的时候HASH算法为MD5
RSADeformatter.SetHashAlgorithm("MD5");
DeformatterData = Convert.FromBase64String(strDeformatterData);
if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
{
return true;
}
else
{
return false;
}
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// RSA签名验证
/// </summary>
/// <param name="strKeyPublic">公钥</param>
/// <param name="strHashbyteDeformatter">Hash描述</param>
/// <param name="strDeformatterData">签名后的结果</param>
/// <returns></returns>
public bool SignatureDeformatter(string strKeyPublic, string strHashbyteDeformatter, string strDeformatterData)
{
try
{
byte[] DeformatterData;
byte[] HashbyteDeformatter;
HashbyteDeformatter = Convert.FromBase64String(strHashbyteDeformatter);
System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
RSA.FromXmlString(strKeyPublic);
System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
//指定解密的时候HASH算法为MD5
RSADeformatter.SetHashAlgorithm("MD5");
DeformatterData = Convert.FromBase64String(strDeformatterData);
if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
{
return true;
}
else
{
return false;
}
}
catch (Exception ex)
{
throw ex;
}
}
#endregion

#endregion

}