如何加密/解密XML文件？ [英] How to encrypt/decrypt an XML file?
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问题描述
//加载此XML文件
System.Xml.XmlDocument myDoc = new System.Xml.XmlDocument（ ）;
myDoc.Load（@c：\persons.xml）;
//获取要加密的指定元素
System.Xml.XmlElement element = myDoc.GetElementsByTagName（Persons）[0] as System.Xml.XmlElement;
//创建一个新的TripleDES键。
System.Security.Cryptography.TripleDESCryptoServiceProvider tDESkey = new System.Security.Cryptography.TripleDESCryptoServiceProvider（）;
//使用密钥形成加密的XML
System.Security.Cryptography.Xml.EncryptedXml encr = new System.Security.Cryptography.Xml.EncryptedXml（）;
encr.AddKeyNameMapping（Deskey，tDESkey）;
//加密元素数据
System.Security.Cryptography.Xml.EncryptedData ed = encr.Encrypt（element，Deskey）;
//用加密数据替换现有数据
System.Security.Cryptography.Xml.EncryptedXml.ReplaceElement（element，ed，false）;
//使用加密数据保存xml文件
myDoc.Save（@c：\encryptedpersons.xml）;
但我不知道我会如何解密？有任何想法吗？谢谢！
解决方案
这样的一个例子：
code> public static class Encryption
{
private const string InitVector =T = A4rAzu94ez-dra;
private const int KeySize = 256;
private const int PasswordIterations = 1000; // 2;
private const string SaltValue =d =？ustAF = UstenAr3B @ pRu8 = ner5sW& h59_Xe9P2za-eFr2fa& ePHE @ ras！a + uc @;
public static string Decrypt（string encryptedText，string passPhrase）
{
byte [] encryptedTextBytes = Convert.FromBase64String（encryptedText）;
byte [] initVectorBytes = Encoding.UTF8.GetBytes（InitVector）;
byte [] passwordBytes = Encoding.UTF8.GetBytes（passPhrase）;
string plainText;
byte [] saltValueBytes = Encoding.UTF8.GetBytes（SaltValue）;
Rfc2898DeriveBytes password = new Rfc2898DeriveBytes（passwordBytes，saltValueBytes，PasswordIterations）;
byte [] keyBytes = password.GetBytes（KeySize / 8）;
RijndaelManaged rijndaelManaged = new RijndaelManaged {Mode = CipherMode.CBC};
尝试
{
使用（ICryptoTransform decryptor = rijndaelManaged.CreateDecryptor（keyBytes，initVectorBytes））
{
using（MemoryStream memoryStream = new MemoryStream（encryptedTextBytes ）
{
using（CryptoStream cryptoStream = new CryptoStream（memoryStream，decryptor，CryptoStreamMode.Read））
{
// TODO：需要研究一下这个。假设加密的文本比普通的更长，但是可能有一个更好的方法
byte [] plainTextBytes = new byte [encryptedTextBytes.Length];
int decryptptedByteCount = cryptoStream.Read（plainTextBytes，0，plainTextBytes.Length）;
plainText = Encoding.UTF8.GetString（plainTextBytes，0，decryptptedByteCount）;
}
}
}
}
catch（CryptographicException）
{
plainText = string.Empty; //假设错误是由无效密码造成的
}
return plainText;
}
public static string Encrypt（string plainText，string passPhrase）
{
string encryptedText;
byte [] initVectorBytes = Encoding.UTF8.GetBytes（InitVector）;
byte [] passwordBytes = Encoding.UTF8.GetBytes（passPhrase）;
byte [] plainTextBytes = Encoding.UTF8.GetBytes（plainText）;
byte [] saltValueBytes = Encoding.UTF8.GetBytes（SaltValue）;
Rfc2898DeriveBytes password = new Rfc2898DeriveBytes（passwordBytes，saltValueBytes，PasswordIterations）;
byte [] keyBytes = password.GetBytes（KeySize / 8）;
RijndaelManaged rijndaelManaged = new RijndaelManaged {Mode = CipherMode.CBC};
使用（ICryptoTransform encryptor = rijndaelManaged.CreateEncryptor（keyBytes，initVectorBytes））
{
使用（MemoryStream memoryStream = new MemoryStream（））
{
使用（CryptoStream cryptoStream = new CryptoStream（memoryStream，encryptor，CryptoStreamMode.Write））
{
cryptoStream.Write（plainTextBytes，0，plainTextBytes.Length）;
cryptoStream.FlushFinalBlock（）;
byte [] cipherTextBytes = memoryStream.ToArray（）;
encryptedText = Convert.ToBase64String（cipherTextBytes）;
}
}
}
return encryptedText;
}
}
编辑： p>
Sani Huttunen指出，如果您使用相同的密码加密多个数据，我上面的静态实现会出现严重的性能问题。您可以在这里阅读更多信息： http：// jmpstart。 wordpress.com/2009/09/29/proper-use-of-rfc2898derivebytes/
编辑：非静态如果您需要使用相同的密码（〜32ms original〜1ms new）执行多次加密/解密，则执行效率要高得多。
public class SimpleEncryption
{
#region构造函数
public SimpleEncryption（string password）
{
byte [] passwordBytes = Encoding.UTF8.GetBytes（password）;
byte [] saltValueBytes = Encoding.UTF8.GetBytes（SaltValue）;
_DeriveBytes = new Rfc2898DeriveBytes（passwordBytes，saltValueBytes，PasswordIterations）;
_InitVectorBytes = Encoding.UTF8.GetBytes（InitVector）;
_KeyBytes = _DeriveBytes.GetBytes（32）;
}
#endregion
#region私人字段
private readonly Rfc2898DeriveBytes _DeriveBytes;
private readonly byte [] _InitVectorBytes;
private readonly byte [] _KeyBytes;
#endregion
private const string InitVector =T = A4rAzu94ez-dra;
private const int PasswordIterations = 1000; // 2;
private const string SaltValue =d =？ustAF = UstenAr3B @ pRu8 = ner5sW& h59_Xe9P2za-eFr2fa& ePHE @ ras！a + uc @;
public string Decrypt（string encryptedText）
{
byte [] encryptedTextBytes = Convert.FromBase64String（encryptedText）;
string plainText;
RijndaelManaged rijndaelManaged = new RijndaelManaged {Mode = CipherMode.CBC};
尝试
{
使用（ICryptoTransform decryptor = rijndaelManaged.CreateDecryptor（_KeyBytes，_InitVectorBytes））
{
using（MemoryStream memoryStream = new MemoryStream（encryptedTextBytes ）
{
using（CryptoStream cryptoStream = new CryptoStream（memoryStream，decryptor，CryptoStreamMode.Read））
{
// TODO：需要研究一下这个。假设加密的文本比普通的更长，但是可能有一个更好的方法
byte [] plainTextBytes = new byte [encryptedTextBytes.Length];
int decryptptedByteCount = cryptoStream.Read（plainTextBytes，0，plainTextBytes.Length）;
plainText = Encoding.UTF8.GetString（plainTextBytes，0，decryptptedByteCount）;
}
}
}
}
catch（CryptographicException异常）
{
plainText = string.Empty; //假设错误是由无效密码造成的
}
return plainText;
}
public string Encrypt（string plainText）
{
string encryptedText;
byte [] plainTextBytes = Encoding.UTF8.GetBytes（plainText）;
RijndaelManaged rijndaelManaged = new RijndaelManaged {Mode = CipherMode.CBC};
using（ICryptoTransform encryptor = rijndaelManaged.CreateEncryptor（_KeyBytes，_InitVectorBytes））
{
using（MemoryStream memoryStream = new MemoryStream（））
{
使用（CryptoStream cryptoStream = new CryptoStream（memoryStream，encryptor，CryptoStreamMode.Write））
{
cryptoStream.Write（plainTextBytes，0，plainTextBytes.Length）;
cryptoStream.FlushFinalBlock（）;
byte [] cipherTextBytes = memoryStream.ToArray（）;
encryptedText = Convert.ToBase64String（cipherTextBytes）;
}
}
}
return encryptedText;
}
}
I am trying to encrypt/decrypt an XML file. I found this sample for encrypting but I do not know how to decrypt? Any idea? Thanks!
// Load this XML file
System.Xml.XmlDocument myDoc = new System.Xml.XmlDocument();
myDoc.Load(@"c:\persons.xml");
// Get a specified element to be encrypted
System.Xml.XmlElement element = myDoc.GetElementsByTagName("Persons")[0] as System.Xml.XmlElement;
// Create a new TripleDES key.
System.Security.Cryptography.TripleDESCryptoServiceProvider tDESkey = new System.Security.Cryptography.TripleDESCryptoServiceProvider();
// Form a Encrypted XML with the Key
System.Security.Cryptography.Xml.EncryptedXml encr = new System.Security.Cryptography.Xml.EncryptedXml();
encr.AddKeyNameMapping("Deskey", tDESkey);
// Encrypt the element data
System.Security.Cryptography.Xml.EncryptedData ed = encr.Encrypt(element, "Deskey");
// Replace the existing data with the encrypted data
System.Security.Cryptography.Xml.EncryptedXml.ReplaceElement(element, ed, false);
// saves the xml file with encrypted data
myDoc.Save(@"c:\encryptedpersons.xml");
But I do not know how I would decrypt that? Any ideas? Thanks!
解决方案
Something like this:
public static class Encryption
{
private const string InitVector = "T=A4rAzu94ez-dra";
private const int KeySize = 256;
private const int PasswordIterations = 1000; //2;
private const string SaltValue = "d=?ustAF=UstenAr3B@pRu8=ner5sW&h59_Xe9P2za-eFr2fa&ePHE@ras!a+uc@";
public static string Decrypt(string encryptedText, string passPhrase)
{
byte[] encryptedTextBytes = Convert.FromBase64String(encryptedText);
byte[] initVectorBytes = Encoding.UTF8.GetBytes(InitVector);
byte[] passwordBytes = Encoding.UTF8.GetBytes(passPhrase);
string plainText;
byte[] saltValueBytes = Encoding.UTF8.GetBytes(SaltValue);
Rfc2898DeriveBytes password = new Rfc2898DeriveBytes(passwordBytes, saltValueBytes, PasswordIterations);
byte[] keyBytes = password.GetBytes(KeySize / 8);
RijndaelManaged rijndaelManaged = new RijndaelManaged { Mode = CipherMode.CBC };
try
{
using (ICryptoTransform decryptor = rijndaelManaged.CreateDecryptor(keyBytes, initVectorBytes))
{
using (MemoryStream memoryStream = new MemoryStream(encryptedTextBytes))
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
//TODO: Need to look into this more. Assuming encrypted text is longer than plain but there is probably a better way
byte[] plainTextBytes = new byte[encryptedTextBytes.Length];
int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
plainText = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
}
}
}
}
catch (CryptographicException)
{
plainText = string.Empty; // Assume the error is caused by an invalid password
}
return plainText;
}
public static string Encrypt(string plainText, string passPhrase)
{
string encryptedText;
byte[] initVectorBytes = Encoding.UTF8.GetBytes(InitVector);
byte[] passwordBytes = Encoding.UTF8.GetBytes(passPhrase);
byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
byte[] saltValueBytes = Encoding.UTF8.GetBytes(SaltValue);
Rfc2898DeriveBytes password = new Rfc2898DeriveBytes(passwordBytes, saltValueBytes, PasswordIterations);
byte[] keyBytes = password.GetBytes(KeySize / 8);
RijndaelManaged rijndaelManaged = new RijndaelManaged {Mode = CipherMode.CBC};
using (ICryptoTransform encryptor = rijndaelManaged.CreateEncryptor(keyBytes, initVectorBytes))
{
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
byte[] cipherTextBytes = memoryStream.ToArray();
encryptedText = Convert.ToBase64String(cipherTextBytes);
}
}
}
return encryptedText;
}
}
Edit:
Sani Huttunen pointed out that my static implementation above has a severe performance issue if you will be encrypting multiple pieces of data using the same password. You can read more about it here: http://jmpstart.wordpress.com/2009/09/29/proper-use-of-rfc2898derivebytes/
Edit: A non-static implementation that is much more efficient if you need to perform multiple encryptions/decryptions using the same password (~32ms original ~1ms new).
public class SimpleEncryption
{
#region Constructor
public SimpleEncryption(string password)
{
byte[] passwordBytes = Encoding.UTF8.GetBytes(password);
byte[] saltValueBytes = Encoding.UTF8.GetBytes(SaltValue);
_DeriveBytes = new Rfc2898DeriveBytes(passwordBytes, saltValueBytes, PasswordIterations);
_InitVectorBytes = Encoding.UTF8.GetBytes(InitVector);
_KeyBytes = _DeriveBytes.GetBytes(32);
}
#endregion
#region Private Fields
private readonly Rfc2898DeriveBytes _DeriveBytes;
private readonly byte[] _InitVectorBytes;
private readonly byte[] _KeyBytes;
#endregion
private const string InitVector = "T=A4rAzu94ez-dra";
private const int PasswordIterations = 1000; //2;
private const string SaltValue = "d=?ustAF=UstenAr3B@pRu8=ner5sW&h59_Xe9P2za-eFr2fa&ePHE@ras!a+uc@";
public string Decrypt(string encryptedText)
{
byte[] encryptedTextBytes = Convert.FromBase64String(encryptedText);
string plainText;
RijndaelManaged rijndaelManaged = new RijndaelManaged { Mode = CipherMode.CBC };
try
{
using (ICryptoTransform decryptor = rijndaelManaged.CreateDecryptor(_KeyBytes, _InitVectorBytes))
{
using (MemoryStream memoryStream = new MemoryStream(encryptedTextBytes))
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
//TODO: Need to look into this more. Assuming encrypted text is longer than plain but there is probably a better way
byte[] plainTextBytes = new byte[encryptedTextBytes.Length];
int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
plainText = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
}
}
}
}
catch (CryptographicException exception)
{
plainText = string.Empty; // Assume the error is caused by an invalid password
}
return plainText;
}
public string Encrypt(string plainText)
{
string encryptedText;
byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
RijndaelManaged rijndaelManaged = new RijndaelManaged {Mode = CipherMode.CBC};
using (ICryptoTransform encryptor = rijndaelManaged.CreateEncryptor(_KeyBytes, _InitVectorBytes))
{
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
byte[] cipherTextBytes = memoryStream.ToArray();
encryptedText = Convert.ToBase64String(cipherTextBytes);
}
}
}
return encryptedText;
}
}
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