生成密钥的方法:
/// <summary>生成RSA加密 解密的 密钥
/// 生成的key就是 方法EncryptByRSA与DecryptByRSA用的key了
/// </summary>
/// <param name="path">要生成的密钥文件的路径(文件夹)</param>
public static void getRSAKey(string path)
{
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
string datetimestr = System.DateTime.Now.ToString("yyyyMMddHHmmss");
using (StreamWriter writer = new StreamWriter("RSA解密_PrivateKey_" + datetimestr + ".xml")) //这个文件要保密...
{
writer.WriteLine(rsa.ToXmlString(true));
}
using (StreamWriter writer = new StreamWriter("RSA加密_PublicKey_" + datetimestr + ".xml"))
{
writer.WriteLine(rsa.ToXmlString(false));
}
}
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
添加.net引用:System.Security.dll .net2.0及以上支持
#region 操作xml文件(加密解密xml;读取加密xml)
private static string rsaKeyname = "wqras";//
//以下加密解密,密钥 就是上面getRSAKey方法生成的xml文件里面的内容了
private static string rsaKey_Encrypt = "<RSAKeyValue><Modulus>tovGC4FG9lfxrDu4+GZ9TzgdAlK4w57cOec/z4y87+2OVwPvd3eGe34a24/Q1eJBaQGHPJBq00LstnOJH19B2F+t7eHR7/WYYvpB98RPWhhwhCdirBs3scTNs3fLXmTrQf/5Xgy2X7TAjgbdQ4lEvG2VkbtcHZLh8+q3CH04lo8=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
private static string rsaKey_Decrypt = "<RSAKeyValue><Modulus>tovGC4FG9lfxrDu4+GZ9TzgdAlK4w57cOec/z4y87+2OVwPvd3eGe34a24/Q1eJBaQGHPJBq00LstnOJH19B2F+t7eHR7/WYYvpB98RPWhhwhCdirBs3scTNs3fLXmTrQf/5Xgy2X7TAjgbdQ4lEvG2VkbtcHZLh8+q3CH04lo8=</Modulus><Exponent>AQAB</Exponent><P>/IZ7CU8o164bGlq6pNQvV8nx/Gw/5wALtZpE280tCTmlD6M5Wl8Bjketwqdek+Nh6qRlrdwOpFUlCxZ3girflQ==</P><Q>uQ7KhsO+hTEPV316uYKPzWQr0es++TF62bOcQGitw6hv+IVI20MuPYZ17D04Nne7nmLkFQVu6+2jQqtPATRkkw==</Q><DP>eq9bV0p+LUsJH+S0iSANYDlct6Zf5XrANZqdmaw1FSZMayyB0MYXm2h3ovptmKwABl+Yhr9C3dQAC0L/DN6HgQ==</DP><DQ>K9XZG3sakipA3BSZEYBf1+M2jg8PZ6/UzeTBynABWSt4+oF39JhBR8ml/UOzIRPTmX0LUf9reu9bkNtLZ5mliQ==</DQ><InverseQ>PGKrRI66SftCvW3qWL1gJ2yqSL9qU+SDoc1TU54dLD5swTEFwEU03kw39M6rF4YJ3XAgA7ansreIsfvRkpy82A==</InverseQ><D>qxvzpN8mHE2tLEvDA5xWQ4aOspnFtSBYwDICf1Ml2yRq8yeuNOal+WXoWPzCvWna9EnJcTzR1Xt7FT7RPsX0mfpRKJ2PmshFfjdoIx+gW+Y/zF4U+u3Dx4bbbNwKFxLRLwSQEzHVK1+Is6QIZiyCIj2NHOtOTmSGvMPgpVpEmlk=</D></RSAKeyValue>"; //读取加密过的xml文档
private static XmlDocument GetDecryptXmlDoc(string xmlpath)
{
XmlDocument xmlDoc = new XmlDocument();
try
{
xmlDoc.PreserveWhitespace = true;
xmlDoc.Load(xmlpath);
}
catch (Exception e)
{
return xmlDoc;
}
RSA rsaKey = new RSACryptoServiceProvider();
try
{
rsaKey.FromXmlString(rsaKey_Decrypt);
//解密xml文档
Decrypt(xmlDoc, rsaKey, rsaKeyname);
//xmlDoc.Save("test.xml");
}
catch (Exception e)
{ }
finally
{
rsaKey.Clear();
}
return xmlDoc;
}
//加密xml
public static void EncryptMyXml(string xmlpath)
{
XmlDocument xmlDoc = new XmlDocument();
try
{
xmlDoc.PreserveWhitespace = true;
xmlDoc.Load(xmlpath);
}
catch (Exception e)
{
return;
}
RSA rsaKey = new RSACryptoServiceProvider();
try
{
rsaKey.FromXmlString(rsaKey_Encrypt);
//加密某节点 Config
Encrypt(xmlDoc, "Config", rsaKey, rsaKeyname);
xmlDoc.Save(xmlpath);
}
catch (Exception e)
{ }
finally
{
rsaKey.Clear();
}
}
//解密xml
public static void DecryptMyXml(string xmlpath)
{
XmlDocument xmlDoc = new XmlDocument();
try
{
xmlDoc.PreserveWhitespace = true;
xmlDoc.Load(xmlpath);
}
catch (Exception e)
{
return;
}
RSA rsaKey = new RSACryptoServiceProvider();
try
{
rsaKey.FromXmlString(rsaKey_Decrypt);
//解密
Decrypt(xmlDoc, rsaKey, rsaKeyname);
xmlDoc.Save(xmlpath);
}
catch (Exception e)
{ }
finally
{
rsaKey.Clear();
}
}
//xml加密
public static void Encrypt(XmlDocument Doc, string ElementToEncrypt, RSA Alg, string KeyName)
{
// Check the arguments.
if (Doc == null)
throw new ArgumentNullException("Doc");
if (ElementToEncrypt == null)
throw new ArgumentNullException("ElementToEncrypt");
if (Alg == null)
throw new ArgumentNullException("Alg"); ////////////////////////////////////////////////
// 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"); } //////////////////////////////////////////////////
// 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.
RijndaelManaged 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; // 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); // Set the KeyInfo element to specify the
// name of the RSA key. // 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); // 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; ////////////////////////////////////////////////////
// Replace the element from the original XmlDocument
// object with the EncryptedData element.
//////////////////////////////////////////////////// EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false); }
//xml解密
public static void Decrypt(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(); }
#endregion
参考资料:https://docs.microsoft.com/zh-cn/dotnet/api/system.security.cryptography.xml.encryptedxml?view=netframework-2.0