using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.Xml;
using System.Security.Cryptography.Xml;
public class CryptographyHelper
{
/// <summary>
/// 系统默认加密Key
/// </summary>
public static string DefaultKey= "testkey";
/// <summary>
/// 进行DES加密。
/// </summary>
/// <param name="pToEncrypt">要加密的字符串。</param>
/// <param name="sKey">密钥，且必须为8位。</param>
/// <returns>以Base64格式返回的加密字符串。</returns>
public static string Encrypt(string pToEncrypt, string sKey)
{
using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
{
byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Convert.ToBase64String(ms.ToArray());
ms.Close();
return str;
}
}
/// <summary>
/// 进行DES解密。
/// </summary>
/// <param name="pToDecrypt">要解密的以Base64</param>
/// <param name="sKey">密钥，且必须为8位。</param>
/// <returns>已解密的字符串。</returns>
public static string Decrypt(string pToDecrypt, string sKey)
{
try
{
byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
{
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return str;
}
}
catch (Exception)
{
return "解密错误";
}
}
public static string UriDataStringEncrypt(string pToEncrypt, string sKey)
{
using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
{
byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Convert.ToBase64String(ms.ToArray());
ms.Close();
return Uri.EscapeDataString(str);
}
}
/// <summary>
/// MD5加密
/// </summary>
/// <param name="algInput"></param>
/// <returns></returns>
public static string EncryptByHMACMD5(string argInput)
{
StringBuilder _strBuilder = new StringBuilder();
HMAC _hmac = HMACMD5.Create();
byte[] _result = _hmac.ComputeHash(ASCIIEncoding.ASCII.GetBytes(argInput));
foreach (byte b in _result)
{
_strBuilder.Append(b.ToString());
}
return _strBuilder.ToString();
}
/// <summary>
/// 验证HMACMD5
/// </summary>
/// <param name="argInput"></param>
/// <param name="argHash"></param>
/// <returns></returns>
public static bool VerifyHMACMD5(string argInput, string argHash)
{
bool _rev = false;
string _argInputHash = EncryptByHMACMD5(argInput);
if (_argInputHash.Equals(argHash))
{
_rev = true;
}
return _rev;
}
/// <summary>
/// 加密MD5
/// </summary>
/// <param name="argInput"></param>
/// <returns></returns>
public static string EncryptByMD5(string argInput)
{
StringBuilder _strBuilder = new StringBuilder();
MD5 _md5 = MD5.Create();
byte[] _result = _md5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(argInput));
foreach (byte b in _result)
{
_strBuilder.Append(b.ToString());
}
return _strBuilder.ToString();
}
/// <summary>
/// 校验MD5
/// </summary>
/// <param name="argInput"></param>
/// <param name="argHash"></param>
/// <returns></returns>
public static bool VerifyMD5(string argInput, string argHash)
{
bool _rev = false;
string _argInputHash = EncryptByMD5(argInput);
if (_argInputHash.Equals(argHash))
{
_rev = true;
}
return _rev;
}
/*---详细见MSDN：--http://msdn.microsoft.com/zh-cn/library/ms229746.aspx*/
/// <summary>
/// xml对称加密
/// </summary>
/// <param name="Doc">xml</param>
/// <param name="ElementToEncrypt">xml对象节点</param>
/// <param name="EncryptionElementID"></param>
/// <param name="Alg"></param>
/// <param name="KeyName"></param>
public static void EncryptXml(XmlDocument Doc, string ElementToEncrypt, string EncryptionElementID, RSA Alg, string KeyName)
{
// Check the arguments.
if (Doc == null)
throw new ArgumentNullException("Doc");
if (ElementToEncrypt == null)
throw new ArgumentNullException("ElementToEncrypt");
if (EncryptionElementID == null)
throw new ArgumentNullException("EncryptionElementID");
if (Alg == null)
throw new ArgumentNullException("Alg");
if (KeyName == null)
throw new ArgumentNullException("KeyName");
////////////////////////////////////////////////
// Find the specified element in the XmlDocument
// object and create a new XmlElemnt object.
////////////////////////////////////////////////
XmlElement elementToEncrypt = Doc.GetElementsByTagName(ElementToEncrypt)[0] as XmlElement;
// Throw an XmlException if the element was not found.
if (elementToEncrypt == null)
{
throw new XmlException("The specified element was not found");
}
RijndaelManaged sessionKey = null;
try
{
//////////////////////////////////////////////////
// Create a new instance of the EncryptedXml class
// and use it to encrypt the XmlElement with the
// a new random symmetric key.
//////////////////////////////////////////////////
// Create a 256 bit Rijndael key.
sessionKey = new RijndaelManaged();
sessionKey.KeySize = 256;
EncryptedXml eXml = new EncryptedXml();
byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, sessionKey, false);
////////////////////////////////////////////////
// Construct an EncryptedData object and populate
// it with the desired encryption information.
////////////////////////////////////////////////
EncryptedData edElement = new EncryptedData();
edElement.Type = EncryptedXml.XmlEncElementUrl;
edElement.Id = EncryptionElementID;
// Create an EncryptionMethod element so that the
// receiver knows which algorithm to use for decryption.
edElement.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncAES256Url);
// Encrypt the session key and add it to an EncryptedKey element.
EncryptedKey ek = new EncryptedKey();
byte[] encryptedKey = EncryptedXml.EncryptKey(sessionKey.Key, Alg, false);
ek.CipherData = new CipherData(encryptedKey);
ek.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncRSA15Url);
// Create a new DataReference element
// for the KeyInfo element. This optional
// element specifies which EncryptedData
// uses this key. An XML document can have
// multiple EncryptedData elements that use
// different keys.
DataReference dRef = new DataReference();
// Specify the EncryptedData URI.
dRef.Uri = "#" + EncryptionElementID;
// Add the DataReference to the EncryptedKey.
ek.AddReference(dRef);
// Add the encrypted key to the
// EncryptedData object.
edElement.KeyInfo.AddClause(new KeyInfoEncryptedKey(ek));
// Set the KeyInfo element to specify the
// name of the RSA key.
// Create a new KeyInfoName element.
KeyInfoName kin = new KeyInfoName();
// Specify a name for the key.
kin.Value = KeyName;
// Add the KeyInfoName element to the
// EncryptedKey object.
ek.KeyInfo.AddClause(kin);
// Add the encrypted element data to the
// EncryptedData object.
edElement.CipherData.CipherValue = encryptedElement;
////////////////////////////////////////////////////
// Replace the element from the original XmlDocument
// object with the EncryptedData element.
////////////////////////////////////////////////////
EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false);
}
catch (Exception e)
{
// re-throw the exception.
throw e;
}
finally
{
if (sessionKey != null)
{
sessionKey.Clear();
}
}
}
/*---详细见MSDN：--http://msdn.microsoft.com/zh-cn/library/ms229746.aspx*/
/// <summary>
/// xml对称解密
/// </summary>
/// <param name="Doc"></param>
/// <param name="Alg"></param>
/// <param name="KeyName"></param>
public static void DecryptXml(XmlDocument Doc, RSA Alg, string KeyName)
{
// Check the arguments.
if (Doc == null)
throw new ArgumentNullException("Doc");
if (Alg == null)
throw new ArgumentNullException("Alg");
if (KeyName == null)
throw new ArgumentNullException("KeyName");
// Create a new EncryptedXml object.
EncryptedXml exml = new EncryptedXml(Doc);
// Add a key-name mapping.
// This method can only decrypt documents
// that present the specified key name.
exml.AddKeyNameMapping(KeyName, Alg);
// Decrypt the element.
exml.DecryptDocument();
}
//加密方法
public static void Encrypt(XmlDocument Doc, string ElementName, SymmetricAlgorithm Key)
{
XmlElement elementToEncrypt = Doc.GetElementsByTagName(ElementName)[0] as XmlElement;
EncryptedXml eXml = new EncryptedXml();
byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, Key, false);
EncryptedData edElement = new EncryptedData();
edElement.Type = EncryptedXml.XmlEncElementUrl;
string encryptionMethod = null;
if (Key is TripleDES)
{
encryptionMethod = EncryptedXml.XmlEncTripleDESUrl;
}
else if (Key is DES)
{
encryptionMethod = EncryptedXml.XmlEncDESUrl;
}
if (Key is Rijndael)
{
switch (Key.KeySize)
{
case 128:
encryptionMethod = EncryptedXml.XmlEncAES128Url;
break;
case 192:
encryptionMethod = EncryptedXml.XmlEncAES192Url;
break;
case 256:
encryptionMethod = EncryptedXml.XmlEncAES256Url;
break;
}
}
edElement.EncryptionMethod = new EncryptionMethod(encryptionMethod);
edElement.CipherData.CipherValue = encryptedElement;
EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false);
}
//解密方法
public static void Decrypt(XmlDocument Doc, SymmetricAlgorithm Alg)
{
XmlElement encryptedElement = Doc.GetElementsByTagName("EncryptedData")[0] as XmlElement;
EncryptedData edElement = new EncryptedData();
edElement.LoadXml(encryptedElement);
EncryptedXml exml = new EncryptedXml();
byte[] rgbOutput = exml.DecryptData(edElement, Alg);
exml.ReplaceData(encryptedElement, rgbOutput);
}
}
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