RSA异常{“Bad Length.\r\\\<br/>”} Noi Matter我的密钥大小是 [英] RSA Exception {&quot;Bad Length.\r\n&quot;} Noi Matter What My Key Size Is

问题描述

我正在收到运行时错误{Bad Length.\r\\\
}：

  return rsa.Encrypt（bytes，true）; 
  

这是在函数中：

  private static byte [] Encrypt（byte [] bytes）
 {
 using（RSACryptoServiceProvider rsa = new RSACryptoServiceProvider（））
 {
 string test = Properties.Settings.Default.PublicKeyXml; 
 
 rsa.FromXmlString（< RSAKeyValue><模量> mfXS3Na0XfkjhpjS3sL5XcC9o + j6KXi1LB9yBc4SsTMo1Yk / pFsXr74gNj4aRxKB45 + HZH / lSo933NCDEh25du1iMsaH4TGQNkCqi + HDLQjOrdXMMNmaQrLXGlY7UCCfFUnkEUxX51AlyVLzqLycaAt6zm5ljnDXojMC7JoCrTM = LT; /模量><指数> AQAB< /指数>< / RSAKeyFile>中）; 
 return rsa.Encrypt（bytes，true）; 
} 
} 
  

我使用的键大小为8192： p>

  CspParameters cspParams = new CspParameters（）; 
 cspParams.KeyContainerName =XML_ENC_RSA_KEY; 
 RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider（8192，cspParams）; 
 string keyXml = rsaKey.ToXmlString（true）; 
  

XML文件很小。根据运行时的长度，它只有225个字节：

  string fileName = System.IO.Path.Combine（Application。 StartupPath，alphaService.xml）; 
 XDocument doc = new XDocument（）; 
 XElement xml = new XElement（Info，
 new XElement（DatabaseServerName，txtServerName.Text），
 new XElement（DatabaseUserName，txtDatabaseUserName.Text），
新的XElement（DatabasePassword，txtDatabasePassword.Text），
 new XElement（ServiceAccount，txtAccount.Text），
 new XElement（ServicePassword，txtServicePassword.Text），
 new XElement （RegistrationCode，txtRegistrationCode.Text））; 
 
 doc.Add（xml）; 
 doc.Save（fileName）; 
 
 //将XML文档转换为字节流
 XmlDocument xmlDoc = new XmlDocument（）; 
 xmlDoc.Load（fileName）; 
 byte [] fileBytes = Encoding.Default.GetBytes（xmlDoc.OuterXml）; 
 int fileBytesLength = fileBytes.Length; 
 
 
 
加密（fileBytes）;根据此SO文章，4096字节的关键大小应该已经足够了：
 （（KeySize  -  384）/ 8）+ 7 
  
我必须使用什么关键的大小？为什么8096字节不工作？我如何才能得到这个工作？
解决方案
这是一个错误，我发现当我尝试一个或其他的代码帖子。 
 
 
 
更改此
 
 
 byte [] fileBytes = Encoding.Default.GetBytes xmlDoc.OuterXml）; 
 
 
到这个
 
 
 byte [] fileBytes = Encoding.Default.GetBytes（xmlDoc.ToString（））; 
 
 
我还建议您更改你的编码从默认到Encoding.ASCII或更多的定义。将它更容易地转换为字符串以保存，然后再返回到一个字节数组进行解密。
 
I am getting the runtime error {"Bad Length.\r\n"} on the line:
return rsa.Encrypt(bytes, true);
This is in the function: 
 private static byte[] Encrypt(byte[] bytes)
        {
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
            {
                string test = Properties.Settings.Default.PublicKeyXml;

                rsa.FromXmlString("<RSAKeyValue><Modulus>mfXS3Na0XfkjhpjS3sL5XcC9o+j6KXi1LB9yBc4SsTMo1Yk/pFsXr74gNj4aRxKB45+hZH/lSo933NCDEh25du1iMsaH4TGQNkCqi+HDLQjOrdXMMNmaQrLXGlY7UCCfFUnkEUxX51AlyVLzqLycaAt6zm5ljnDXojMC7JoCrTM=</Modulus><Exponent>AQAB</Exponent></RSAKeyFile>");
                return rsa.Encrypt(bytes, true);
            }
        }
I am using a key size of 8192:
CspParameters cspParams = new CspParameters();
                cspParams.KeyContainerName = "XML_ENC_RSA_KEY";
                RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider(8192, cspParams);
                string keyXml = rsaKey.ToXmlString(true);
The XML file is small. According to the length at runtime, it is only 225 bytes:
string fileName = System.IO.Path.Combine(Application.StartupPath, "alphaService.xml");
                XDocument doc = new XDocument();
                XElement xml = new XElement("Info",
                    new XElement("DatabaseServerName", txtServerName.Text),
                    new XElement("DatabaseUserName", txtDatabaseUserName.Text),
                    new XElement("DatabasePassword", txtDatabasePassword.Text),
                    new XElement("ServiceAccount", txtAccount.Text),
                    new XElement("ServicePassword", txtServicePassword.Text),
                    new XElement("RegistrationCode", txtRegistrationCode.Text));

                doc.Add(xml);
                doc.Save(fileName);

                // Convert XML doc to byte stream
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(fileName);
                byte[] fileBytes = Encoding.Default.GetBytes(xmlDoc.OuterXml);
                int fileBytesLength = fileBytes.Length;



  Encrypt(fileBytes);
According to this SO post, a key size of 4096 bytes should have been sufficient:
((KeySize - 384) / 8) + 7
What key size do I have to use? Why doesn't 8096 bytes work? How can I get this to work?
解决方案
This is the same error I found when I tried the code of one or your other post.  

Change this

  
byte[] fileBytes = Encoding.Default.GetBytes(xmlDoc.OuterXml);
to this

  
byte[] fileBytes = Encoding.Default.GetBytes(xmlDoc.ToString());
I would also suggest that you change your encoding from default to Encoding.ASCII or something more defined.  It will be easier to convert it to a string to save and then back to a byte array to decrypt.

                        
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