如何使用C#加密解密XML文档

来源：互联网发布：太阳系3d软件编辑：程序博客网时间：2024/06/11 15:33

原文地址： http://blog.csdn.net/woyaowenzi/article/details/6573952

.NET Framework 提供了几种类，可用于对 XML 数据进行加密和解密，以及创建和验证 XML 数字签名。这些类提供了维护 XML 数据的保密性和完整性的方法。在这里，我们只涉及如何使用.NET Framework本身提供了的EncryptedXml类进行加密和解密。该类提供了一些方法，能够让用户使用不同的算法进行加密和解密XML。

要使用EncryptedXml类进行加密和解密，我们需要搞清楚两个主题。

1. 加密算法的选取。

2. 如何进行加密。

涉及到加密算法，一般分为两种类型的算法，对称加密算法（SymmetricAlgorithm）和非对称加密算法（AsymmetricAlgorithm）。两种算法的区别在于，使用对称加密算法进行加密和解密，加密过程和解密过程都是使用同一个密钥；对于非对称加密和解密，则是使用一个相互匹配密钥对----公钥和私钥进行加解密。【顺便简单的提及一下非对称加密方式和原理。对于这种类型的加密，加密密钥和解密密钥是相对的说法，如果用加密密钥加密那么只有解密密钥才能恢复，如果用解密密钥加密则只有加密密钥能解密，所以它们被称为密钥对，其中的一个可以在网络上发送、公布，叫做公钥，而另一个则只有密钥对的所有人才持有，叫做私钥，非对称公开密钥系统又叫做公钥系统。非对称加密算法的基本原理是，如果发信方想发送只有收信方才能解读的加密信息，发信方必须首先知道收信方的公钥，然后利用收信方的公钥来加密原文；收信方收到加密密文后，使用自己的私钥才能解密密文。显然，采用不对称加密算法，收发信双方在通信之前，收信方必须将自己早已随机生成的公钥送给发信方，而自己保留私钥。】另外，这两种加密在效率上有比较大的区别，前者效率高，后者效率要相对低一些。所以，加密大量数据，一般都是采用对称加密算法将数据进行加密，为了使加密更加安全，再使用非对称加密算法将加密数据的对称加密密钥进行加密，这样，在进行网络传输时，即保证了加密数据的效率，又保证了加密数据的安全性，当然，在没有将加密的数据进行网络传输时，就没有必要使用非对称加密了，普通的对称加密就可以满足需求。（大家可以仔细Google一下。）

对于这两种加密，常见对称加密算法有DES, AES（又称为Rijndael，其密钥长度分128,192,256位这三种）, TripleDES等；非对称加密算法常见的有RSA算法。这几种加密算法对应的类分别是：DESCryptoServiceProvider， RijndaelManaged，TripleDESCryptoServiceProvider以及RSACryptoServiceProvider。前有三种都从SymmetricAlgorithm继承过来，最后一种从AsymmetricAlgorithm继承过来。

好了，基本上关于加密解密，我们已以有一个大致的了解，那么，下面详细的描述一下如何进行加密和解密。

在下面的描述中，我参考了以下文档：

XML Encryption Syntax and Processing（W3C XML加解密标准文档）

XML 加密和数字签名（该主题下含有XML各种类型的加解密）

假定现在有如下XML文档（test.xml），我们要对其进行加密/解密：

[xhtml] view plaincopy

<root>
<creditcard>
<number>19834209</number>
<expiry>02/02/2002</expiry>
</creditcard>
</root>

加密的大致流程如下：

1. 通过从磁盘加载 XML 文件创建 XmlDocument 对象。XmlDocument 对象包含要加密的 XML 元素。

2. 在 XmlDocument 对象中找到指定的元素，然后创建一个新的 XmlElement 对象来表示要加密的元素。

3. 创建 EncryptedXml 类的新实例，并使用它通过指定的加密算法对 XmlElement 进行加密。

4. 构造一个 EncryptedData 对象，用XML 加密元素的 URL 标识符、EncryptedKey信息等填充它，并将加密数据填充到该结构体里面去。（很重要，很繁琐的步骤）

5. 用 EncryptedData 元素替换原始 XmlDocument 对象中的元素。

我们直接拿test.xml来加密，要加密的元素是<number>，加密粒度是该结点，加密数据采用最简单的DES加密，加密后的XML文档变为：

[xhtml] view plaincopy

<root>
<creditcard>
<EncryptedData Type="http://www.w3.org/2001/04/xmlenc#Element" xmlns="http://www.w3.org/2001/04/xmlenc#">
<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#des-cbc" />
<CipherData>
<CipherValue>3oIDgOJMW0/Ev3duGiCvsVdDgPzP7X0399xwVKMR8MQUGO1AMTIlFA==</CipherValue>
</CipherData>
</EncryptedData>
<expiry>02/02/2002</expiry>
</creditcard>
</root>

从该加密后的XML里面可以看得出来，<EncryptedData>这个节点里面的内容为加密后的核心内容，但这里面真正被加密的内容在哪？很明显，<CipherValue>中3oIDgOJMW0/Ev3duGiCvsVdDgPzP7X0399xwVKMR8MQUGO1AMTIlFA==这一长串就是加密后的真正数据。那其它部分都是些什么内容？这里，我们需要熟悉一下W3C关于加密的标准。可参见XML Encryption Syntax and Processing文档。

从加密后的XML里面可以看出，<EncryptedData>节点包含了被加密后的数据和其它信息，W3C为其定义的标准结构如下：

（其中，“？”表示出现0次或1次，“+”表示出现1次或多次，“*”表示0次或多次，空元素标签表示该元素的内容为空）

[xhtml] view plaincopy

<EncryptedData Id? Type? MimeType? Encoding?>
<EncryptionMethod/>?
<ds:KeyInfo>
<EncryptedKey>?
<AgreementMethod>?
<ds:KeyName>?
<ds:RetrievalMethod>?
<ds:*>?
</ds:KeyInfo>?
<CipherData>
<CipherValue>?
<CipherReference URI?>?
</CipherData>
<EncryptionProperties>?
</EncryptedData>

其中：

1. <EncryptionMethod> 用于描述加密方式。一般情况下，需要设置该项。

2. <ds:KeyInfo>用于描述用于加密数据的key。一般情况下，需要设置该项的<KeyName>节点。

3. <EncryptedKey>用于描述将加密数据的key①进行加密的新key②的信息。有点绕，实际上，它出现于这样的情形：当我们使用对称加密key（如：DES加密）对数据进行加密，为了加密更加安全，然后采用另外一种高级加密方式（如：RSA加密），对这个key再进行一次加密，并将这个key加密后的生成的加密数据保存到<EncryptedKey>里面的<CipherData>节点下面。解密时，需要通过给出key②，先将原始加密数据的key①解密出来，再将原始数据进行解密。要注意一点，<EncryptedKey>的数据结构实际上和<EncryptedData>的数据结构是类似的。给出一个简单的例子，如：

[c-sharp] view plaincopy

<EncryptedKey Id="EK" xmlns="http://www.w3.org/2001/04/xmlenc#">
<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-1_5" />
<ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:KeyName>John Smith</ds:KeyName>
</ds:KeyInfo>
<CipherData>
<CipherValue>xyzabc</CipherValue>
</CipherData>
<ReferenceList>
<DataReference URI="#ED" />
</ReferenceList>
<CarriedKeyName>Sally Doe</CarriedKeyName>
</EncryptedKey>

这里面<CipherValue>xyzabc</CipherValue>中的数据实际上就是被加密后的key.

MSDN上所给出的DEMO称这种方式为非对称加密方式，但我认为有些不妥，因为加密真正数据的部分并没有采用非对称加密方式，而只是将key①使用了非对称加密。

4. 元素<CipherData>代表加密数据的结构，其中的<CipherValue>代表真正加密后的数据。

对于以上所有结构，在.NET Framework的类里面都有对应的类。

EncryptedData Class

EncryptionMethod Class

KeyInfo Class

EncryptedKey Class

CipherData Class

CipherReference Class

KeyInfoName Class

……

（个人感觉，这些类实在是太多了，有点抽象过度的嫌疑。）

另外，我们需要了解一下加密粒度（Encryption Granularity）。加密粒度分两种，一是加密节点内部的数据，另一个加密整个节点。比如，我们可以选择只加密<number>的内容19834209，当然也可以选择加密<number>整个结点。

实际上，通过上面的内容可以看出，加密XML最核心的东西实际上只有两个部分，第一是将原始数据进行加密，第二是构建<EncryptedData>节点内的数据。

OK，整个加密的流程以及相关的背景知识介绍得差不多了。下面通过封装一个加解密的类（GTXXmlCrypt）来说明如何使用EncryptedXml进行加解密。

首先，需要描述我们所使用的EncryptedXml类里面几个重要的方法，这几个方法也是在这个封装类里面用到的，简单描述一下，详细请见MSDN：

1. public byte[] EncryptData(XmlElement inputElement, SymmetricAlgorithm symmetricAlgorithm, bool content);

a) 通过给定的对称加密算法，对指定的节点进行加密，content指明是否是加密整个节点还是只加密节点内容。

b) 在该类中，用于加密节点的方法只能通过称加密算法，而不能够通过非对称加密节点，可能他们认为使用非对称加密的实际含义是：先通过对称加密将数据进行加密，再用非对称加密将前者（对称加密的key）进行加密，这种方式才叫非对称加密。

2. public byte[] DecryptData(EncryptedData encryptedData, SymmetricAlgorithm symmetricAlgorithm);

a) 通过给定的对称解密算法（加密和解密的key是一样的），将数据进行解密，同样，只能使用对称加密方式。

3. public void DecryptDocument();

a) 解密整个文档，但它使用的前提是：在被加密后的文档中，<EncryptedData>节点必须含有<KeyInfo>，而且其中的<KeyName>必须有值。可以通过将要封装的类实验。

4. public static void ReplaceElement(XmlElement inputElement, EncryptedData encryptedData, bool content);

a) 当加密完后，需要用EncryptedData来替换加密的节点。

5. public static byte[] DecryptKey(byte[] keyData, SymmetricAlgorithm symmetricAlgorithm);

a) 该方法通过对称加密算法解密“加密原数据的密钥”。

6. public static byte[] DecryptKey(byte[] keyData, RSA rsa, bool useOAEP);

a) 该方法通过非对称加密算法解密“加密原数据的密钥”。

我们需要封装的GTXXmlCrypt类有以下需求：

1. 能够加载一个xml文件进行加解密；

2. 能够某个XmlDocument进行加解密；

3. 能够对单个指定的节点进行加解密；

4. 能够指定各种加解密的方式，如指定加密方式为DES，AES，RSA等；

该类的框架如下：（请原谅我只给出了一个代码的架子，也没有用类图的形式表示出来，因为我会将所有代码全部贴上来。）

[c-sharp] view plaincopy

namespace GTXUtility.Security.Crypt
{
public class GTXXmlCrypt
{
// 定义对称加密类型，对于非对称加密类型，我没有给出重新定义一个结构体，
// 原因是因为EncryptedXml类对非对称加密只支持RSA，而且RSA也不是用来加密数据的，而是用来加密key的。
public enum SymmetricAlgTypes
{
DES = 1,
AES128, // Rijndael 128
AES192, // Rijndael 192
AES256, // Rijndael 256
TripleDES,
}
// 该类通过指定的对称加密类型，创建对应的对称加密key，
// 实际上，对于创建加密key，完全可以另外写个类，进行操作，而不应该放在该类里面。
public static SymmetricAlgorithm CreateSymmetricAlgorithm(SymmetricAlgTypes salType);
// 该类用于创建RSA key，
// 实际上，对于创建加密key，完全可以另外写个类，进行操作，而不应该放在该类里面。
public static RSA CreateRSAAlgorithm(String containerName);
// 加密指定的文件，该函数内部会调用EncryptXmlDoc函数。
public static bool EncryptXmlFile(
String filePath, // 指定需要加密的文件
String elementName, // 需要指定加密的元素
bool bContent, // 是否只加密元素的内容？
object key, // 加密密钥，可以是对称的，也可以是非对称的
String keyName); // 指定加密密钥的名称（可选）
// 加密指定的XmlDocument对象，该函数内部会循环调用EncryptXmlNode函数
//（该函数分为对称密钥版和非对称密钥版）加密XmlDocument内部所有符合要求的节点。
public static bool EncryptXmlDoc(
XmlDocument xmlDoc, // 指定需要加密的XmlDocument对象
String elementName, // 需要指定加密的元素
bool bContent, // 是否只加密元素的内容？
object key, // 加密密钥，可以是对称的，也可以是非对称的
String keyName); // 指定加密密钥的名称（可选）
// （核心功能）加密指定的节点（对称加密方式）
public static bool EncryptXmlNode(
XmlElement elementToEncrypt, // 指定需要加密的XmlElement对象（节点）
bool bContent, // 是否只加密元素的内容？
SymmetricAlgorithm salgKey, // 对称加密密钥
String keyName); // 指定加密密钥的名称（可选）
// （核心功能）加密指定的节点（非对称加密方式）
public static bool EncryptXmlNode(
XmlElement elementToEncrypt, // 指定需要加密的XmlElement对象（节点）
bool bContent, // 是否只加密元素的内容？
RSA rsaKey, // 对称加密密钥，用于加密sessionKey到<EncryptedKey>节点中去
String keyName, // 指定加密密钥的名称（可选）
SymmetricAlgorithm sessionKey); // 用于加密原始数据的对称密钥（注：加密数据只能用对称加密）
// 解密指定的文件，该函数内部会调用DecryptXmlDoc函数。
public static bool DecryptXmlFile(String filePath, object key, String keyName);
// 解密指定的XmlDocument对象，该函数内部会循环调用DecryptXmlNode函数
public static bool DecryptXmlDoc(XmlDocument xmlDoc, object key, String keyName);
// （核心功能）解密指定的节点（对称加密方式和非对称加密方式统统放在一个函数内）
public static bool DecryptXmlNode(XmlElement encryptedElement, SymmetricAlgorithm salgKey);
// 该函数用于创建<EncryptionMethod>节点对象
private static EncryptionMethod CreateEncryptionMethod(object keyAlg, bool isKeyWrapAlgUri, bool isOaep);
// 该类用于解密使用RSA加密时，所使用到的sessionkey，内部调用GenerateSyAlgKey函数
private static SymmetricAlgorithm DecryptKey(XmlDocument xmlDoc, object decryptKey);
// 该类用于解密使用RSA加密时，所使用到的sessionkey
private static SymmetricAlgorithm GenerateSyAlgKey(byte[] decryptedKeyData, EncryptionMethod encMethod);
}
}

该类基本上比较简单，我们只重点分析一下加密的核心功能。

[c-sharp] view plaincopy

public static bool EncryptXmlNode(
XmlElement elementToEncrypt,
bool bContent,
SymmetricAlgorithm salgKey,
String keyName)
{
if (null == elementToEncrypt || null == salgKey)
{
return false;
}
try
{
// 1. Create a new instance of the EncryptedXml class and use it
// to encrypt the XmlElement with the symmetric key.
EncryptedXml eXml = new EncryptedXml();
byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, salgKey, bContent);
// 2. Construct an EncryptedData object and populate it
// with the desired encryption information.
EncryptedData edElement = new EncryptedData();
edElement.Type = EncryptedXml.XmlEncElementUrl;
// 3. Create an EncryptionMethod element so that the receiver
// knows which algorithm to use for decryption.
edElement.EncryptionMethod = CreateEncryptionMethod(salgKey, false, false);
// 4. Set the KeyInfo element to specify the name of the key.
if (null != keyName && !keyName.Equals(String.Empty))
{
// Create a new KeyInfo element.
edElement.KeyInfo = new KeyInfo();
// Create a new KeyInfoName element.
KeyInfoName kin = new KeyInfoName();
// Specify a name for the key.
kin.Value = keyName;
// Add the KeyInfoName element.
edElement.KeyInfo.AddClause(kin);
}
// 5. Add the encrypted element data to the EncryptedData object.
edElement.CipherData.CipherValue = encryptedElement;
// 6. Replace the element from the original XmlDocument
// object with the EncryptedData element.
EncryptedXml.ReplaceElement(elementToEncrypt, edElement, bContent);
return true;
}
catch (System.Exception ex)
{
}
return false;
}

加密某个节点分以下步骤:

1．创建 EncryptedXml 类的新实例，并使用它通过对称密钥对 XmlElement 进行加密。EncryptData 方法将加密的元素作为加密字节的数组返回。

2．构造一个 EncryptedData 对象，然后用 XML 加密元素的 URL 标识符填充它。此 URL 标识符使解密方知道 XML 包含一个加密元素。可以使用XmlEncElementUrl 字段指定 URL 标识符。

3．创建 EncryptionMethod 对象，该对象被初始化为用来生成密钥的加密算法的 URL 标识符。将 EncryptionMethod 对象传递给 EncryptionMethod 属性。

4．如果用户给加密数据的key设置了一个名称，那就创建一个KeyInfo的对象，并通过KeyInfoName为其指定一个名称。

5．将加密的元素数据添加到 EncryptedData 对象中。

6．用 EncryptedData 元素替换原始 XmlDocument 对象中的元素。

使用RSA加密的整体流程和这个类似，只不过多了一步加密sessionkey（加密原始数据的key）的过程。在这里我就不再赘述了，请直接看源代码。

以下是解密的代码：

[c-sharp] view plaincopy

public static bool DecryptXmlDoc(XmlDocument xmlDoc, object key, String keyName)
{
try
{
// First, we try to decrypt xml document with EncryptedXml.DecryptDocument() method,
// this method decrypts all <EncryptedData> elements of the XML document, but its precondition
// is that the <EncryptedData> elements has been specified <KeyInfo>'s <KeyName>, if this element
// hasn't been specified, it will failed and throw a CryptographicException exception.
// Second, if we hasn't specified key name, we can only decrypt the document with SymmetricAlgorithm
// key, this is restricted to the API of EncryptedXml class.
if (null != keyName && !keyName.Equals(String.Empty))
{
// Create a new EncryptedXml object.
EncryptedXml exml = new EncryptedXml(xmlDoc);
// Add a key-name mapping.
// This method can only decrypt documents that present the specified key name.
exml.AddKeyNameMapping(keyName, key);
// Decrypt the element.
exml.DecryptDocument();
return true;
}
else
{
SymmetricAlgorithm salgKey = null;
RSA rsaKey = null;
if (key is SymmetricAlgorithm)
{
salgKey = key as SymmetricAlgorithm;
}
else if (key is RSA)
{
rsaKey = key as RSA;
salgKey = DecryptKey(xmlDoc, key);
}
else
{
return false;
}
XmlNodeList nodeList = xmlDoc.GetElementsByTagName("EncryptedData");
int nCount = nodeList.Count;
for (int ix = 0; ix < nCount; ++ix)
{
XmlElement encryptedElement = nodeList[0] as XmlElement;
if (null != salgKey)
{
if (!DecryptXmlNode(encryptedElement, salgKey))
{
return false;
}
}
}
return true;
}
}
catch (System.Exception ex)
{
}
return false;

解密分两步：

1. 如果给出了keyName和解密密钥，那么直接使用EncryptedXml的DecryptDocument方法。

2. 否则，我们就需要一个节点一个节点的解密了。对于非对称的解密，一般直接使用DecryptDocument方法就可以了。

整个代码如下：

GTXXmlCrypt代码：

[c-sharp] view plaincopy

/*!
* @file GTXXmlCrypt.cs
*
* @brief This file implements the class of GTXXmlCrypt.
* This class is used to crypt or decrypt xml file.
*
*
* @author Liu Lin
* @date 2011/6/19
*/
using System;
using System.IO;
using System.Security.AccessControl;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
using System.Security.Principal;
using System.Xml;
namespace GTXUtility.Security.Crypt
{
/// <summary>
/// This class is used to encrypt xml file with Symmetric Encryption Algorithm (such as
/// DES, AES, TripleDES and so on) and Asymmetric Encryption Algorithm (such as RSA).
/// </summary>
/// <remarks>
/// Expressed in shorthand form, the EncryptedData element has the following structure:
/// (where "?" denotes zero or one occurrence;
/// "+" denotes one or more occurrences;
/// "*" denotes zero or more occurrences;
/// and the empty element tag means the element must be empty )
/// <EncryptedData Id? Type? MimeType? Encoding?>
/// <EncryptionMethod/>?
/// <ds:KeyInfo>
/// <EncryptedKey>?
/// <AgreementMethod>?
/// <ds:KeyName>?
/// <ds:RetrievalMethod>?
/// <ds:*>?
/// </ds:KeyInfo>?
/// <CipherData>
/// <CipherValue>?
/// <CipherReference URI?>?
/// </CipherData>
/// <EncryptionProperties>?
/// </EncryptedData>
/// The <EncryptedKey> is the same with the <EncryptedData>.
/// To get some more informations, please attach the following references.
/// http://www.w3.org/TR/xmlenc-core/
/// http://msdn.microsoft.com/zh-cn/library/system.security.cryptography.xml.encryptedxml.aspx
/// </remarks>
public class GTXXmlCrypt
{
/// <summary>
/// Defines Symmetric Encryption Algorithm types.
/// </summary>
public enum SymmetricAlgTypes
{
DES = 1,
AES128, // Rijndael 128
AES192, // Rijndael 192
AES256, // Rijndael 256
TripleDES,
}
/// <summary>
/// Create a Symmetric Encryption Algorithm object.
/// </summary>
/// <param name="salType">Specified Symmetric Encryption Algorithm type.</param>
/// <returns>If create success, returns the Symmetric Encryption Algorithm object.
/// Otherwise, return null object.</returns>
public static SymmetricAlgorithm CreateSymmetricAlgorithm(SymmetricAlgTypes salType)
{
SymmetricAlgorithm symAlg = null;
switch (salType)
{
case SymmetricAlgTypes.DES:
symAlg = SymmetricAlgorithm.Create("DES");
break;
case SymmetricAlgTypes.AES128:
symAlg = SymmetricAlgorithm.Create("Rijndael");
symAlg.KeySize = 128;
break;
case SymmetricAlgTypes.AES192:
symAlg = SymmetricAlgorithm.Create("Rijndael");
symAlg.KeySize = 192;
break;
case SymmetricAlgTypes.AES256:
symAlg = SymmetricAlgorithm.Create("Rijndael");
symAlg.KeySize = 256;
break;
case SymmetricAlgTypes.TripleDES:
symAlg = SymmetricAlgorithm.Create("TripleDES");
break;
default:
break;
}
return symAlg;
}
/// <summary>
/// This method has two use.
/// First, create a RSA encryption algorithm object when first use it, it'll
/// stroe the RSA key into key container which specified by the paramter.
/// Second, this method can get the RSA key from container when use for second time.
/// The container name must be the same with the first.
/// </summary>
/// <param name="containerName">The key container name.</param>
/// <returns>Returns the instance of RSA.</returns>
/// <remarks>
/// Microsoft recommends to store asymmetric keys in a key container.
/// http://msdn.microsoft.com/zh-cn/library/tswxhw92(VS.80).aspx
/// </remarks>
public static RSA CreateRSAAlgorithm(String containerName)
{
RSACryptoServiceProvider rsaKey = null;
try
{
// Create a new CspParameters object to specify a key container.
CspParameters cspParams = new CspParameters();
cspParams.KeyContainerName = containerName;
cspParams.Flags = CspProviderFlags.UseMachineKeyStore;
// Add the key's access privilege
CryptoKeySecurity keySecurity = new CryptoKeySecurity();
SecurityIdentifier si = new SecurityIdentifier(WellKnownSidType.LocalSid/*WorldSid*/, null);
keySecurity.AddAccessRule(new CryptoKeyAccessRule(si, CryptoKeyRights.FullControl, AccessControlType.Allow));
cspParams.CryptoKeySecurity = keySecurity;
// Create a new RSA key and save it in the container. This key will encrypt
// a symmetric key, which will then be encrypted in the XML document.
rsaKey = new RSACryptoServiceProvider(cspParams);
}
catch (System.Exception ex)
{
}
return rsaKey;
}
/// <summary>
/// Encrypt a xml file's elements by specified key.
/// </summary>
/// <param name="filePath">The path of xml file which needs to be encrypted.</param>
/// <param name="elementName">The element (node) in xml file which needs to be encrypted.</param>
/// <param name="bContent">Whether to encrypt the element content or not. true to
/// encrypt only the contents of the element; false to encrypt the entire element.</param>
/// <param name="key">The specified encryption key.</param>
/// <param name="keyName">The key name which used to display the <KeyInfo> in encrypted xml.
/// It can be empty or null.</param>
/// <returns>If encrypt success, return true, otherwise, return false.</returns>
/// <remarks>After encryption success, it'll save the new data into xml file.</remarks>
public static bool EncryptXmlFile(
String filePath,
String elementName,
bool bContent,
object key,
String keyName)
{
if (File.Exists(filePath) && Path.GetExtension(filePath).ToLower().Equals(".xml") &&
null != elementName && !elementName.Equals(String.Empty) &&
null != key)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.PreserveWhitespace = true;
xmlDoc.Load(filePath);
if (EncryptXmlDoc(xmlDoc, elementName, bContent, key, keyName))
{
xmlDoc.Save(filePath);
return true;
}
return false;
}
return false;
}
/// <summary>
/// Encrypt a xml document's elements by specified key.
/// </summary>
/// <param name="xmlDoc">The XmlDocument object which needs to be encrypted.</param>
/// <param name="elementName">The element (node) in xml file which needs to be encrypted.</param>
/// <param name="bContent">Whether to encrypt the element content or not. true to
/// encrypt only the contents of the element; false to encrypt the entire element.</param>
/// <param name="key">The specified encryption key.</param>
/// <param name="keyName">The key name which used to display the <KeyInfo> in encrypted xml.
/// It can be empty or null.</param>
/// <returns>If encrypt success, return true, otherwise, return false.</returns>
public static bool EncryptXmlDoc(
XmlDocument xmlDoc,
String elementName,
bool bContent,
object key,
String keyName)
{
SymmetricAlgorithm salgKey = null;
RSA rsaKey = null;
SymmetricAlgorithm sessionKey = null;
// If currnet key is SymmetricAlgorithm, we'll use this key to encrypt elemnet.
// Else if currnet key is RSA, we need to create a session key to encrypt elemnet,
// and the RSA key is used to encrypt session key. Please pay more attention.
if (key is SymmetricAlgorithm)
{
salgKey = key as SymmetricAlgorithm;
}
else if (key is RSA)
{
rsaKey = key as RSA;
sessionKey = CreateSymmetricAlgorithm(SymmetricAlgTypes.DES/*AES256*/);
}
else
{
return false;
}
try
{
XmlNodeList nodeList = xmlDoc.GetElementsByTagName(elementName);
int nCount = nodeList.Count;
if (0 == nCount)
{
return false;
}
for (int ix = 0; ix < nCount; ++ix)
{
// Please pay more attention about the follows:
// If we want to encrypt a node (XmlElement) in node list, the node will be delete
// after we encrypt it and the count will be decremented, as a result, each time
// we need to encrypt nodeList[0].
// But if we want to encrypt a node's content in node list, the node will NOT be delete
// after we encrypt it and the count will NOT be decremented, as a result, each time
// we need to encrypt nodeList[ix].
XmlElement elementToEncrypt = bContent ? (nodeList[ix] as XmlElement) : (nodeList[0] as XmlElement);
if (null != salgKey)
{
if (!EncryptXmlNode(elementToEncrypt, bContent, salgKey, keyName))
{
return false;
}
}
else if (null != rsaKey)
{
if (!EncryptXmlNode(elementToEncrypt, bContent, rsaKey, keyName, sessionKey))
{
return false;
}
}
}
return true;
}
catch (System.Exception ex)
{
}
finally
{
// Clear session key.
if (null != sessionKey)
{
sessionKey.Clear();
}
}
return false;
}
/// <summary>
/// Encrypt a xml element (node) by specified Symmetric Algorithm key.
/// </summary>
/// <param name="elementToEncrypt">The element which needs to be encrypted.</param>
/// <param name="bContent">Whether to encrypt the element content or not. true to
/// encrypt only the contents of the element; false to encrypt the entire element.</param>
/// <param name="salgKey">Specified Symmetric Algorithm key.</param>
/// <param name="keyName">The key name which used to display the <KeyInfo> in encrypted xml.
/// It can be empty or null.</param>
/// <returns>If encrypt success, return true, otherwise, return false.</returns>
public static bool EncryptXmlNode(
XmlElement elementToEncrypt,
bool bContent,
SymmetricAlgorithm salgKey,
String keyName)
{
if (null == elementToEncrypt || null == salgKey)
{
return false;
}
try
{
// 1. Create a new instance of the EncryptedXml class and use it
// to encrypt the XmlElement with the symmetric key.
EncryptedXml eXml = new EncryptedXml();
byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, salgKey, bContent);
// 2. Construct an EncryptedData object and populate it
// with the desired encryption information.
EncryptedData edElement = new EncryptedData();
edElement.Type = EncryptedXml.XmlEncElementUrl;
// 3. Create an EncryptionMethod element so that the receiver
// knows which algorithm to use for decryption.
edElement.EncryptionMethod = CreateEncryptionMethod(salgKey, false, false);
// 4. Set the KeyInfo element to specify the name of the key.
if (null != keyName && !keyName.Equals(String.Empty))
{
// Create a new KeyInfo element.
edElement.KeyInfo = new KeyInfo();
// Create a new KeyInfoName element.
KeyInfoName kin = new KeyInfoName();
// Specify a name for the key.
kin.Value = keyName;
// Add the KeyInfoName element.
edElement.KeyInfo.AddClause(kin);
}
// 5. Add the encrypted element data to the EncryptedData object.
edElement.CipherData.CipherValue = encryptedElement;
// 6. Replace the element from the original XmlDocument
// object with the EncryptedData element.
EncryptedXml.ReplaceElement(elementToEncrypt, edElement, bContent);
return true;
}
catch (System.Exception ex)
{
}
return false;
}
/// <summary>
/// Encrypt a xml element (node) by specified RSA key.
/// Actually, it w
/// </summary>
/// <param name="elementToEncrypt">The element which needs to be encrypted.</param>
/// <param name="bContent">Whether to encrypt the element content or not. true to
/// encrypt only the contents of the element; false to encrypt the entire element.</param>
/// <param name="rsaKey">Specified RSA key, which used to encrypt the session key.</param>
/// <param name="keyName">The key name which used to display the <KeyInfo> in encrypted xml.
/// It can be empty or null.</param>
/// <param name="sessionKey">The specified Symmetric Algorithm key used to encrypt xml element data.</param>
/// <returns>If encrypt success, return true, otherwise, return false.</returns>
/// <remarks>Actually, I don't think it's a RSA encryption, because the RSA key is only used to
/// encrypt the session key, not used to encrypt xml element data.</remarks>
public static bool EncryptXmlNode(
XmlElement elementToEncrypt,
bool bContent,
RSA rsaKey,
String keyName,
SymmetricAlgorithm sessionKey)
{
if (null == elementToEncrypt || null == rsaKey)
{
return false;
}
try
{
// 1. Create a new instance of the EncryptedXml class and use it to
// encrypt the XmlElement with the a new random symmetric key.
// Encrypt the xml's element and get the crypted data.
EncryptedXml eXml = new EncryptedXml();
byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, sessionKey, bContent);
// 2. Construct an EncryptedData object and populate
// it with the desired encryption information.
EncryptedData edElement = new EncryptedData();
edElement.Type = EncryptedXml.XmlEncElementUrl;
// 3. Create an EncryptionMethod element so that the
// receiver knows which algorithm to use for decryption.
edElement.EncryptionMethod = CreateEncryptionMethod(sessionKey, false, false);
// 4. Encrypt the session key and add it to an EncryptedKey element.
EncryptedKey ek = new EncryptedKey();
byte[] encryptedKey = EncryptedXml.EncryptKey(sessionKey.Key, rsaKey, false);
ek.CipherData = new CipherData(encryptedKey);
ek.EncryptionMethod = CreateEncryptionMethod(rsaKey, false, false);
// 5. Set the KeyInfo element to specify the name of the RSA key.
if (null != keyName && !keyName.Equals(String.Empty))
{
// Create a new KeyInfo element.
edElement.KeyInfo = new KeyInfo();
// 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);
}
// 6. Add the encrypted key to the EncryptedData object.
edElement.KeyInfo.AddClause(new KeyInfoEncryptedKey(ek));
// Add the encrypted element data to the EncryptedData object.
edElement.CipherData.CipherValue = encryptedElement;
// 7. Replace the element from the original XmlDocument
// object with the EncryptedData element.
EncryptedXml.ReplaceElement(elementToEncrypt, edElement, bContent);
return true;
}
catch (System.Exception ex)
{
}
return false;
}
/// <summary>
/// Encrypt a xml file's elements by specified key.
/// </summary>
/// <param name="filePath">The path of xml file which needs to be encrypted.</param>
/// <param name="elementName">The element (node) in xml file which needs to be encrypted.</param>
/// <param name="bContent">Whether to encrypt the element content or not. true to
/// encrypt only the contents of the element; false to encrypt the entire element.</param>
/// <param name="key">The specified encryption key.</param>
/// <param name="keyName">The key name which used to display the <KeyInfo> in encrypted xml.
/// It can be empty or null.</param>
/// <returns>If encrypt success, return true, otherwise, return false.</returns>
/// <remarks>After encryption success, it'll save the new data into xml file.</remarks>
/// <summary>
/// Decrypt a xml file's elements by specified key.
/// </summary>
/// <param name="filePath">The path of xml file which needs to be decrypted.</param>
/// <param name="key">The specified decryption key which used to encrypt before.</param>
/// <param name="keyName">The key name which used to display the <KeyInfo> in encrypted xml.
/// It can be empty or null.</param>
/// <returns>If decrypt success, return true, otherwise, return false.</returns>
/// <remarks>After decryption success, it'll save the new data into xml file.</remarks>
public static bool DecryptXmlFile(String filePath, object key, String keyName)
{
if (File.Exists(filePath) && Path.GetExtension(filePath).ToLower().Equals(".xml") &&
null != key)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.PreserveWhitespace = true;
xmlDoc.Load(filePath);
if (DecryptXmlDoc(xmlDoc, key, keyName))
{
xmlDoc.Save(filePath);
return true;
}
return false;
}
return false;
}
/// <summary>
/// Decrypt a xml document's elements by specified key.
/// </summary>
/// <param name="xmlDoc">The XmlDocument object which needs to be decrypted.</param>
/// <param name="key">The specified decryption key which used to encrypt before.</param>
/// <param name="keyName">The key name which used to display the <KeyInfo> in encrypted xml.
/// It can be empty or null.</param>
/// <returns>If decrypt success, return true, otherwise, return false.</returns>
public static bool DecryptXmlDoc(XmlDocument xmlDoc, object key, String keyName)
{
try
{
// First, we try to decrypt xml document with EncryptedXml.DecryptDocument() method,
// this method decrypts all <EncryptedData> elements of the XML document, but its precondition
// is that the <EncryptedData> elements has been specified <KeyInfo>'s <KeyName>, if this element
// hasn't been specified, it will failed and throw a CryptographicException exception.
// Second, if we hasn't specified key name, we can only decrypt the document with SymmetricAlgorithm
// key, this is restricted to the API of EncryptedXml class.
if (null != keyName && !keyName.Equals(String.Empty))
{
// Create a new EncryptedXml object.
EncryptedXml exml = new EncryptedXml(xmlDoc);
// Add a key-name mapping.
// This method can only decrypt documents that present the specified key name.
exml.AddKeyNameMapping(keyName, key);
// Decrypt the element.
exml.DecryptDocument();
return true;
}
else
{
SymmetricAlgorithm salgKey = null;
RSA rsaKey = null;
if (key is SymmetricAlgorithm)
{
salgKey = key as SymmetricAlgorithm;
}
else if (key is RSA)
{
rsaKey = key as RSA;
salgKey = DecryptKey(xmlDoc, key);
}
else
{
return false;
}
XmlNodeList nodeList = xmlDoc.GetElementsByTagName("EncryptedData");
int nCount = nodeList.Count;
for (int ix = 0; ix < nCount; ++ix)
{
XmlElement encryptedElement = nodeList[0] as XmlElement;
if (null != salgKey)
{
if (!DecryptXmlNode(encryptedElement, salgKey))
{
return false;
}
}
}
return true;
}
}
catch (System.Exception ex)
{
}
return false;
}
/// <summary>
/// Decrypt xml element (node) by specified Symmetric Algorithm key.
/// </summary>
/// <param name="encryptedElement">The xml element which needs to be decrypted.</param>
/// <param name="salgKey">Specified Symmetric Algorithm key.</param>
/// <returns>If decrypt success, return true, otherwise, return false.</returns>
/// <remarks>We can only use Symmetric Algorithm key to decrypt xml element data but RSA,
/// because this is restricted to the API of EncryptedXml class. Please note it on MSDN.</remarks>
public static bool DecryptXmlNode(XmlElement encryptedElement, SymmetricAlgorithm salgKey)
{
try
{
// 1. Construct an EncryptedData object and populate it
// with the desired encryption information.
EncryptedData edElement = new EncryptedData();
edElement.LoadXml(encryptedElement);
// 2. Create a new instance of the EncryptedXml class and use it
// to encrypt the XmlElement with the symmetric key.
EncryptedXml eXml = new EncryptedXml();
byte[] rgbOutput = eXml.DecryptData(edElement, salgKey);
// 3. Replace the encryptedData element with the plaintext XML element.
eXml.ReplaceData(encryptedElement, rgbOutput);
return true;
}
catch (System.Exception ex)
{
}
return false;
}
/// <summary>
/// Retrieve the EncryptionMethod object which contain in EncryptionData.
/// </summary>
/// <param name="keyAlg">Specified encryption algorithm object.</param>
/// <param name="isKeyWrapAlgUri">Whether the namespace Uniform Resource Identifier (URI)
/// for Wrap algorithm or not. This can be used only the keyAlg is a Symmetric Encryption Algorithm.
/// If used this, the isOaep will be ignored.</param>
/// <param name="isOaep">Whether to use RSA Optimal Asymmetric Encryption Padding (OAEP)
/// encryption algorithm. This can be used only the keyAlg is a RSA Asymmetric.
/// If used this, the isKeyWrapAlgUri will be ignored.</param>
/// <returns>Return the EncryptionMethod object.</returns>
private static EncryptionMethod CreateEncryptionMethod(object keyAlg, bool isKeyWrapAlgUri, bool isOaep)
{
EncryptionMethod encMethod = new EncryptionMethod();
String URI = String.Empty;
if (keyAlg is DES)
{
encMethod.KeyAlgorithm = EncryptedXml.XmlEncDESUrl;
//encMethod.KeySize = 0; [exception, why?]
}
else if (keyAlg is Rijndael)
{
switch ((keyAlg as Rijndael).KeySize)
{
case 128:
encMethod.KeyAlgorithm = isKeyWrapAlgUri ?
EncryptedXml.XmlEncAES128KeyWrapUrl : EncryptedXml.XmlEncAES128Url;
encMethod.KeySize = 128;
break;
case 192:
encMethod.KeyAlgorithm = isKeyWrapAlgUri ?
EncryptedXml.XmlEncAES192KeyWrapUrl : EncryptedXml.XmlEncAES192Url;
encMethod.KeySize = 192;
break;
case 256:
encMethod.KeyAlgorithm = isKeyWrapAlgUri ?
EncryptedXml.XmlEncAES256KeyWrapUrl : EncryptedXml.XmlEncAES256Url;
encMethod.KeySize = 256;
break;
default:
break;
}
}
else if (keyAlg is TripleDES)
{
encMethod.KeyAlgorithm = isKeyWrapAlgUri ?
EncryptedXml.XmlEncTripleDESKeyWrapUrl : EncryptedXml.XmlEncTripleDESUrl;
//encMethod.KeySize = 0; [exception, why?]
}
else if (keyAlg is RSA)
{
encMethod.KeyAlgorithm = isOaep ?
EncryptedXml.XmlEncRSAOAEPUrl : EncryptedXml.XmlEncRSA15Url;
}
else
{
// Do nothing
}
return encMethod;
}
/// <summary>
/// Decrypt encryption key (in node of <EncryptedKey>) which used to encrypt xml element.
/// </summary>
/// <param name="xmlDoc">The encrypted XmlDocument object.</param>
/// <param name="decryptKey">The key which used to decrypt encryption key.
/// The key must be Triple DES Key Wrap algorithm or the Advanced Encryption Standard
/// (AES) Key Wrap algorithm (also called Rijndael) or RSA key.</param>
/// <returns>Return Symmetric Algorithm key object whihc used to decrypt xml element.</returns>
private static SymmetricAlgorithm DecryptKey(XmlDocument xmlDoc, object decryptKey)
{
XmlNodeList encKeyNodeList = xmlDoc.GetElementsByTagName("EncryptedKey");
XmlNodeList encDataNodeList = xmlDoc.GetElementsByTagName("EncryptedData");
if (encDataNodeList.Count > 0 && encKeyNodeList.Count > 0)
{
XmlElement encryptedKey = encKeyNodeList[0] as XmlElement;
EncryptedKey ek = new EncryptedKey();
ek.LoadXml(encryptedKey);
byte[] decryptedData = null;
//if (decryptKey is SymmetricAlgorithm)
if (decryptKey is Rijndael || decryptKey is TripleDES)
{
decryptedData = EncryptedXml.DecryptKey(ek.CipherData.CipherValue, (SymmetricAlgorithm)decryptKey);
}
else if (decryptKey is RSA)
{
// kek is an RSA key: get fOAEP from the algorithm, default to false
bool fOAEP = (ek.EncryptionMethod != null && ek.EncryptionMethod.KeyAlgorithm == EncryptedXml.XmlEncRSAOAEPUrl);
decryptedData = EncryptedXml.DecryptKey(ek.CipherData.CipherValue, (RSA)decryptKey, fOAEP);
}
else
{
// The key (decryptKey) used to decrypt encryption data key is not the Triple DES Key Wrap algorithm
// or the Advanced Encryption Standard (AES) Key Wrap algorithm (also called Rijndael).
return null;
}
XmlElement encryptDataXml = encDataNodeList[0] as XmlElement;
EncryptedData encryptData = new EncryptedData();
encryptData.LoadXml(encryptDataXml);
return GenerateSyAlgKey(decryptedData, encryptData.EncryptionMethod);
}
return null;
}
/// <summary>
/// Generate a Symmetric Algorithm key by specified key data and EncryptionMethod object.
/// </summary>
/// <param name="decryptedKeyData">Key data.</param>
/// <param name="encMethod">The EncryptionMethod object.</param>
/// <returns>Return Symmetric Algorithm key object whihc used to decrypt xml element.</returns>
private static SymmetricAlgorithm GenerateSyAlgKey(byte[] decryptedKeyData, EncryptionMethod encMethod)
{
if (null == encMethod || null == decryptedKeyData || 0 == decryptedKeyData.Length)
{
return null;
}
String keyAlg = encMethod.KeyAlgorithm;
int keySize = encMethod.KeySize;
SymmetricAlgorithm symAlg = null;
if (keyAlg.Equals(EncryptedXml.XmlEncDESUrl))
{
symAlg = SymmetricAlgorithm.Create("DES");
symAlg.Key = decryptedKeyData;
}
else if (keyAlg.Equals(EncryptedXml.XmlEncAES128Url) || keyAlg.Equals(EncryptedXml.XmlEncAES128KeyWrapUrl))
{
symAlg = SymmetricAlgorithm.Create("Rijndael");
symAlg.KeySize = 128;
symAlg.Key = decryptedKeyData;
}
else if (keyAlg.Equals(EncryptedXml.XmlEncAES192Url) || keyAlg.Equals(EncryptedXml.XmlEncAES192KeyWrapUrl))
{
symAlg = SymmetricAlgorithm.Create("Rijndael");
symAlg.KeySize = 192;
symAlg.Key = decryptedKeyData;
}
else if (keyAlg.Equals(EncryptedXml.XmlEncAES256Url) || keyAlg.Equals(EncryptedXml.XmlEncAES256KeyWrapUrl))
{
symAlg = SymmetricAlgorithm.Create("Rijndael");
symAlg.KeySize = 256;
symAlg.Key = decryptedKeyData;
}
else if (keyAlg.Equals(EncryptedXml.XmlEncTripleDESUrl) || keyAlg.Equals(EncryptedXml.XmlEncTripleDESKeyWrapUrl))
{
symAlg = SymmetricAlgorithm.Create("TripleDES");
symAlg.Key = decryptedKeyData;
}
else
{
}
return symAlg;
}
}
}

测试代码：

[c-sharp] view plaincopy

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Xml;
using GTXUtility.Security.Crypt;
namespace TestUtility
{
public class TestXmlCrypt
{
enum PrintTypes
{
PrintOriginal,
PrintEncrypt,
PrintDecrypt
}
public static void UseDemo()
{
Console.WriteLine("Test Xml Crypt begin...");
Console.WriteLine("Input file path: (You can drag a file into console without input file path)");
String filePath = Console.ReadLine();
if (File.Exists(filePath))
{
PrintXml(filePath, PrintTypes.PrintOriginal);
Console.WriteLine("Select Symmetric/Asymmetric(RSA) Algorithm, 0: Symmetric, 1: Asymmetric (Default is Symmetric)");
String alg = Console.ReadLine();
int nAlg = alg.Equals("1") ? 1 : 0;
switch (nAlg)
{
case 0:
TestSymmetricAlgorithm(filePath);
break;
case 1:
TestAsymmetricAlgorithm(filePath);
break;
default:
break;
}
}
Console.WriteLine("Test Xml Crypt end...");
}
private static void TestSymmetricAlgorithm(String filePath)
{
Console.WriteLine("Select the encrypt/decrypt algorithm: (Default is DES)");
GTXXmlCrypt.SymmetricAlgTypes salTypeTemp = GTXXmlCrypt.SymmetricAlgTypes.DES;
for (; salTypeTemp <= GTXXmlCrypt.SymmetricAlgTypes.TripleDES; ++salTypeTemp)
{
Console.WriteLine("{0} is {1}", (int)salTypeTemp, salTypeTemp.ToString());
}
// Read the symmetric algorithm command
String algString = Console.ReadLine();
GTXXmlCrypt.SymmetricAlgTypes salType = GTXXmlCrypt.SymmetricAlgTypes.DES;
try
{
salType = (GTXXmlCrypt.SymmetricAlgTypes)Convert.ToInt32(algString);
if (salType <= GTXXmlCrypt.SymmetricAlgTypes.DES &&
salType >= GTXXmlCrypt.SymmetricAlgTypes.TripleDES)
{
salType = GTXXmlCrypt.SymmetricAlgTypes.DES;
}
}
catch (System.Exception ex)
{
salType = GTXXmlCrypt.SymmetricAlgTypes.DES;
}
// Read the node which we want to encrypt/decrypt
Console.WriteLine("Input the XML element node:");
String elementName = Console.ReadLine();
Console.WriteLine("Encrypt node element or its content, 0: Element, 1: Only content (Default is Element)");
String content = Console.ReadLine();
bool bContent = content.Equals("1") ? true : false;
SymmetricAlgorithm sal = GTXXmlCrypt.CreateSymmetricAlgorithm(salType);
if (GTXXmlCrypt.EncryptXmlFile(filePath, elementName, bContent, sal, "abc"))
{
// Print the encrypted XML to console
Console.WriteLine("Encrypt XML with {0} algorithm Succeed!", salType);
PrintXml(filePath, PrintTypes.PrintEncrypt);
if (GTXXmlCrypt.DecryptXmlFile(filePath, sal, /*"abc"*/""))
{
// Print the decrypted XML to console
Console.WriteLine("Decrypt XML with {0} algorithm Succeed!", salType);
PrintXml(filePath, PrintTypes.PrintDecrypt);
}
else
{
Console.WriteLine("Decrypt with {0} algorithm Failed!", salType);
}
}
else
{
Console.WriteLine("Encrypt with {0} algorithm Failed!", salType);
}
}
private static void TestAsymmetricAlgorithm(String filePath)
{
String keyContainerName = "rsakey container";
RSA rsaKey = GTXXmlCrypt.CreateRSAAlgorithm(keyContainerName);
try
{
// Read the node which we want to encrypt/decrypt
Console.WriteLine("Input the XML element node:");
String elementName = Console.ReadLine();
Console.WriteLine("Encrypt node element or its content, 0: Element, 1: Only content (Default is Element)");
String content = Console.ReadLine();
bool bContent = content.Equals("1") ? true : false;
if (GTXXmlCrypt.EncryptXmlFile(filePath, elementName, bContent, rsaKey, ""/*"rsakey"*/))
{
// Print the encrypted XML to console
Console.WriteLine("Encrypt XML with RSA algorithm Succeed!");
PrintXml(filePath, PrintTypes.PrintEncrypt);
if (GTXXmlCrypt.DecryptXmlFile(filePath, rsaKey, ""/*"rsakey"*/))
{
PrintXml(filePath, PrintTypes.PrintDecrypt);
Console.WriteLine("Decrypt XML with RSA algorithm Succeed!");
}
else
{
Console.WriteLine("Decrypt XML with RSA algorithm Failed!");
}
}
else
{
Console.WriteLine("Encrypt xml with RSA algorithm Failed!");
}
}
catch (System.Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
rsaKey.Clear();
}
}
static void PrintXml(String filePath, PrintTypes printType)
{
String format = String.Empty;
switch (printType)
{
case PrintTypes.PrintOriginal:
format = "■ Original file:/n{0}";
break;
case PrintTypes.PrintEncrypt:
format = "■ Encryptd file:/n{0}";
break;
case PrintTypes.PrintDecrypt:
format = "■ Decrypted file:/n{0}";
break;
}
XmlDocument doc = new XmlDocument();
//doc.PreserveWhitespace = true;
doc.Load(filePath);
XmlWriterSettings xmlSetting = new XmlWriterSettings();
xmlSetting.Indent = true;
xmlSetting.IndentChars = "/t";
xmlSetting.Encoding = Encoding.UTF8;
MemoryStream stream = new MemoryStream();
XmlWriter writer = XmlWriter.Create(stream, xmlSetting);
doc.Save(writer);
doc.Save(filePath);
// Reload the file and update the doc.InnerXml property.
doc.PreserveWhitespace = true;
doc.Load(filePath);
Console.WriteLine(format, doc.InnerXml);
}
}
}

主函数：

[c-sharp] view plaincopy

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace TestUtility
{
class Program
{
static void Main(string[] args)
{
TestXmlCrypt.UseDemo();
}
}
}

如果该代码存在问题或者您有好的建议，请第一时间通知我，让我再将这份代码完善一下。

哎，CSDN的这个blog编辑器实在是太令人失望了，格式实在是太难调整了。

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