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本文實例講述了C#自定義RSA加密解密及RSA簽名和驗證類。分享給大家供大家參考。具體分析如下：

這個C#類自定義RSA加密解密及RSA簽名和驗證，包含了RSA加密、解密及簽名所需的相關函數，帶有詳細的註釋說明。

using System;
using System.Text;
using System.Security.Cryptography;
namespace DotNet.Utilities
{
 /// <summary>
 /// RSA加密解密及RSA簽名和驗證
 /// </summary>
 public class RSACryption
 {
  public RSACryption()
  {
  }
  #region RSA 加密解密
  #region RSA 的密鑰產生
  /// <summary>
  /// RSA 的密鑰產生 產生私鑰 和公鑰
  /// </summary>
  /// <param name="xmlKeys"></param>
  /// <param name="xmlPublicKey"></param>
  public void RSAKey(out string xmlKeys,out string xmlPublicKey)
  {
    System.Security.Cryptography.RSACryptoServiceProvider rsa=new RSACryptoServiceProvider();
    xmlKeys=rsa.ToXmlString(true);
    xmlPublicKey = rsa.ToXmlString(false);
  }
  #endregion
  #region RSA的加密函數
  //##############################################################################
  //RSA 方式加密
  //說明KEY必須是XML的行式,返回的是字符串
  //在有一點需要說明！！該加密方式有 長度 限制的！！
  //##############################################################################
  //RSA的加密函數 string
  public string RSAEncrypt(string xmlPublicKey,string m_strEncryptString )
  {
   byte[] PlainTextBArray;
   byte[] CypherTextBArray;
   string Result;
   RSACryptoServiceProvider rsa=new RSACryptoServiceProvider();
   rsa.FromXmlString(xmlPublicKey);
   PlainTextBArray = (new UnicodeEncoding()).GetBytes(m_strEncryptString);
   CypherTextBArray = rsa.Encrypt(PlainTextBArray, false);
   Result=Convert.ToBase64String(CypherTextBArray);
   return Result;
  }
  //RSA的加密函數 byte[]
  public string RSAEncrypt(string xmlPublicKey,byte[] EncryptString )
  {
   byte[] CypherTextBArray;
   string Result;
   RSACryptoServiceProvider rsa=new RSACryptoServiceProvider();
   rsa.FromXmlString(xmlPublicKey);
   CypherTextBArray = rsa.Encrypt(EncryptString, false);
   Result=Convert.ToBase64String(CypherTextBArray);
   return Result;
  }
  #endregion
  #region RSA的解密函數
  //RSA的解密函數 string
  public string RSADecrypt(string xmlPrivateKey, string m_strDecryptString )
  {
   byte[] PlainTextBArray;
   byte[] DypherTextBArray;
   string Result;
   System.Security.Cryptography.RSACryptoServiceProvider rsa=new RSACryptoServiceProvider();
   rsa.FromXmlString(xmlPrivateKey);
   PlainTextBArray =Convert.FromBase64String(m_strDecryptString);
   DypherTextBArray=rsa.Decrypt(PlainTextBArray, false);
   Result=(new UnicodeEncoding()).GetString(DypherTextBArray);
   return Result;
  }
  //RSA的解密函數 byte
  public string RSADecrypt(string xmlPrivateKey, byte[] DecryptString )
  {
   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;
  }
  #endregion
  #endregion
  #region RSA數字簽名
  #region 獲取Hash描述表
  //獲取Hash描述表 ，sharejs.com
  public bool GetHash(string m_strSource, ref byte[] HashData)
  {
   //從字符串中取得Hash描述
   byte[] Buffer;
   System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
   Buffer = System.Text.Encoding.GetEncoding("GB2312").GetBytes(m_strSource);
   HashData = MD5.ComputeHash(Buffer);
   return true;
  }
  //獲取Hash描述表
  public bool GetHash(string m_strSource, ref string strHashData)
  {
   //從字符串中取得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(m_strSource);
   HashData = MD5.ComputeHash(Buffer);
   strHashData = Convert.ToBase64String(HashData);
   return true;
  }
  //獲取Hash描述表
  public bool GetHash(System.IO.FileStream objFile, ref byte[] HashData)
  {
   //從文件中取得Hash描述
   System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
   HashData = MD5.ComputeHash(objFile);
   objFile.Close();
   return true;
  }
  //獲取Hash描述表
  public bool GetHash(System.IO.FileStream objFile, ref string strHashData)
  {
   //從文件中取得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;
  }
  #endregion
  #region RSA簽名
  //RSA簽名
  public bool SignatureFormatter(string p_strKeyPrivate, byte[] HashbyteSignature, ref byte[] EncryptedSignatureData)
  {
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
    RSA.FromXmlString(p_strKeyPrivate);
    System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
    //設置簽名的算法為MD5
    RSAFormatter.SetHashAlgorithm("MD5");
    //執行簽名
    EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
    return true;
  }
  //RSA簽名
  public bool SignatureFormatter(string p_strKeyPrivate, byte[] HashbyteSignature, ref string m_strEncryptedSignatureData)
  {
    byte[] EncryptedSignatureData;
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
    RSA.FromXmlString(p_strKeyPrivate);
    System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
    //設置簽名的算法為MD5
    RSAFormatter.SetHashAlgorithm("MD5");
    //執行簽名
    EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
    m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);
    return true;
  }
  //RSA簽名
  public bool SignatureFormatter(string p_strKeyPrivate, string m_strHashbyteSignature, ref byte[] EncryptedSignatureData)
  {
    byte[] HashbyteSignature;
    HashbyteSignature = Convert.FromBase64String(m_strHashbyteSignature);
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
    RSA.FromXmlString(p_strKeyPrivate);
    System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
    //設置簽名的算法為MD5
    RSAFormatter.SetHashAlgorithm("MD5");
    //執行簽名
    EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
    return true;
  }
  //RSA簽名
  public bool SignatureFormatter(string p_strKeyPrivate, string m_strHashbyteSignature, ref string m_strEncryptedSignatureData)
  {
    byte[] HashbyteSignature;
    byte[] EncryptedSignatureData;
    HashbyteSignature = Convert.FromBase64String(m_strHashbyteSignature);
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
    RSA.FromXmlString(p_strKeyPrivate);
    System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
    //設置簽名的算法為MD5
    RSAFormatter.SetHashAlgorithm("MD5");
    //執行簽名
    EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
    m_strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);
    return true;
  }
  #endregion
  #region RSA 簽名驗證
  public bool SignatureDeformatter(string p_strKeyPublic, byte[] HashbyteDeformatter, byte[] DeformatterData)
  {
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
    RSA.FromXmlString(p_strKeyPublic);
    System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
    //指定解密的時候HASH算法為MD5
    RSADeformatter.SetHashAlgorithm("MD5");
    if(RSADeformatter.VerifySignature(HashbyteDeformatter,DeformatterData))
    {
     return true;
    }
    else
    {
     return false;
    }
  }
  public bool SignatureDeformatter(string p_strKeyPublic, string p_strHashbyteDeformatter, byte[] DeformatterData)
  {
    byte[] HashbyteDeformatter;
    HashbyteDeformatter = Convert.FromBase64String(p_strHashbyteDeformatter);
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
    RSA.FromXmlString(p_strKeyPublic);
    System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
    //指定解密的時候HASH算法為MD5
    RSADeformatter.SetHashAlgorithm("MD5");
    if(RSADeformatter.VerifySignature(HashbyteDeformatter,DeformatterData))
    {
     return true;
    }
    else
    {
     return false;
    }
  }
  public bool SignatureDeformatter(string p_strKeyPublic, byte[] HashbyteDeformatter, string p_strDeformatterData)
  {
    byte[] DeformatterData;
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
    RSA.FromXmlString(p_strKeyPublic);
    System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
    //指定解密的時候HASH算法為MD5
    RSADeformatter.SetHashAlgorithm("MD5");
    DeformatterData =Convert.FromBase64String(p_strDeformatterData);
    if(RSADeformatter.VerifySignature(HashbyteDeformatter,DeformatterData))
    {
     return true;
    }
    else
    {
     return false;
    }
  }
  public bool SignatureDeformatter(string p_strKeyPublic, string p_strHashbyteDeformatter, string p_strDeformatterData)
  {
    byte[] DeformatterData;
    byte[] HashbyteDeformatter;
    HashbyteDeformatter = Convert.FromBase64String(p_strHashbyteDeformatter);
    System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
    RSA.FromXmlString(p_strKeyPublic);
    System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
    //指定解密的時候HASH算法為MD5
    RSADeformatter.SetHashAlgorithm("MD5");
    DeformatterData =Convert.FromBase64String(p_strDeformatterData);
    if(RSADeformatter.VerifySignature(HashbyteDeformatter,DeformatterData))
    {
     return true;
    }
    else
    {
     return false;
    }
  }
  #endregion
  #endregion
 }
}

希望本文所述對大家的C#程序設計有所幫助。

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C#自定義RSA加密解密及RSA簽名和驗證類實例

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C#自定義RSA加密解密及RSA簽名和驗證類實例