我正在尝试解密用Rijndael algorythm加密的字符串。如果长度小于16个字符，则此类型的加密在Key和IV的右侧应用带“＃”的填充。要解密的字符串是从发送它的Web服务接收的，而密钥是以XML SOAP格式发送给我的。 IV是我的机器的Mac地址（服务器使用IV来加密字符串）。当我尝试解密收到的字符串时，我的程序在此指令时崩溃：
while ((num5 = stream3.ReadByte()) != -1)
它给我这个错误“填充无效且无法删除”。 我在MSDN上搜索过这个错误，它说当用于加密的IV与用于解密的IV不同时会发生这种情况，但是，我再说一遍，IV是MacAddress，每次都是相同的。
这是加密和解密功能的源代码：
public static string Decrypt(string strInputString, string strKeyString, string myIV)
{
if ((strInputString == null) || (strInputString.Length == 0))
{
return strInputString;
}
try
{
int num5;
int keySize = 0x100;
int blockSize = 0x100;
int length = keySize / 0x10;
if (strKeyString.Length > length)
{
strKeyString = strKeyString.Substring(0, length);
}
if (strKeyString.Length < length)
{
strKeyString = strKeyString.PadRight(length, '#');
}
Encoding.Unicode.GetBytes(strKeyString);
if (myIV.Length > length)
{
myIV = myIV.Substring(0, length);
}
if (myIV.Length < length)
{
myIV = myIV.PadRight(length, '#');
}
Encoding.Unicode.GetBytes(myIV);
byte[] bytes = Encoding.Unicode.GetBytes(strKeyString);
byte[] rgbIV = Encoding.Unicode.GetBytes(myIV);
RijndaelManaged managed = new RijndaelManaged {
BlockSize = blockSize,
KeySize = keySize
};
MemoryStream stream = new MemoryStream();
for (int i = 0; i < strInputString.Length; i += 2)
{
stream.WriteByte(byte.Parse(strInputString.Substring(i, 2), NumberStyles.AllowHexSpecifier));
}
stream.Position = 0L;
MemoryStream stream2 = new MemoryStream();
CryptoStream stream3 = new CryptoStream(stream, managed.CreateDecryptor(bytes, rgbIV), CryptoStreamMode.Read);
while ((num5 = stream3.ReadByte()) != -1)
{
stream2.WriteByte((byte) num5);
}
stream3.Close();
stream2.Close();
stream.Close();
byte[] buffer3 = stream2.ToArray();
return Encoding.Unicode.GetString(buffer3);
}
catch (Exception exception)
{
Log.Error(exception.Message);
}
}
public static string Encrypt(string strInputString, string strKeyString, string myIV)
{
if ((strInputString == null) || (strInputString.Length == 0))
{
return strInputString;
}
try
{
int num4;
int keySize = 0x100;
int blockSize = 0x100;
int length = keySize / 0x10;
if (strKeyString.Length > length)
{
strKeyString = strKeyString.Substring(0, length);
}
if (strKeyString.Length < length)
{
strKeyString = strKeyString.PadRight(length, '#');
}
Encoding.Unicode.GetBytes(strKeyString);
if (myIV.Length > length)
{
myIV = myIV.Substring(0, length);
}
if (myIV.Length < length)
{
myIV = myIV.PadRight(length, '#');
}
Encoding.Unicode.GetBytes(myIV);
byte[] bytes = Encoding.Unicode.GetBytes(strKeyString);
byte[] rgbIV = Encoding.Unicode.GetBytes(myIV);
string str = "";
RijndaelManaged managed = new RijndaelManaged {
BlockSize = blockSize,
KeySize = keySize
};
MemoryStream stream = new MemoryStream(Encoding.Unicode.GetBytes(strInputString));
MemoryStream stream2 = new MemoryStream();
CryptoStream stream3 = new CryptoStream(stream2, managed.CreateEncryptor(bytes, rgbIV), CryptoStreamMode.Write);
while ((num4 = stream.ReadByte()) != -1)
{
stream3.WriteByte((byte) num4);
}
stream3.Close();
stream2.Close();
stream.Close();
foreach (byte num5 in stream2.ToArray())
{
str = str + num5.ToString("X2");
}
return str;
}
catch (Exception exception)
{
Log.Error(exception.Message);
}
}
}
答案 0 :(得分：0)
使用下面的测试代码可以正常使用 - 您确定要传入加密字符串进行解密吗？
static void Main(string[] args)
{
string strInputString = "test";
string strKeyString = "test123";
string myIV = GetMacAddress();
string encryptedString = Encrypt(strInputString, strKeyString, myIV);
string decryptedString = Decrypt(encryptedString, strKeyString, myIV);
}
public static string Decrypt(string strInputString, string strKeyString, string myIV)
{
if ((strInputString == null) || (strInputString.Length == 0))
{
return strInputString;
}
int num5;
int keySize = 0x100;
int blockSize = 0x100;
int length = keySize / 0x10;
if (strKeyString.Length > length)
{
strKeyString = strKeyString.Substring(0, length);
}
if (strKeyString.Length < length)
{
strKeyString = strKeyString.PadRight(length, '#');
}
Encoding.Unicode.GetBytes(strKeyString);
if (myIV.Length > length)
{
myIV = myIV.Substring(0, length);
}
if (myIV.Length < length)
{
myIV = myIV.PadRight(length, '#');
}
Encoding.Unicode.GetBytes(myIV);
byte[] bytes = Encoding.Unicode.GetBytes(strKeyString);
byte[] rgbIV = Encoding.Unicode.GetBytes(myIV);
RijndaelManaged managed = new RijndaelManaged
{
BlockSize = blockSize,
KeySize = keySize
};
MemoryStream stream = new MemoryStream();
for (int i = 0; i < strInputString.Length; i += 2)
{
stream.WriteByte(byte.Parse(strInputString.Substring(i, 2), NumberStyles.AllowHexSpecifier));
}
stream.Position = 0L;
MemoryStream stream2 = new MemoryStream();
CryptoStream stream3 = new CryptoStream(stream, managed.CreateDecryptor(bytes, rgbIV), CryptoStreamMode.Read);
while ((num5 = stream3.ReadByte()) != -1)
{
stream2.WriteByte((byte)num5);
}
stream3.Close();
stream2.Close();
stream.Close();
byte[] buffer3 = stream2.ToArray();
return Encoding.Unicode.GetString(buffer3);
}
public static string Encrypt(string strInputString, string strKeyString, string myIV)
{
if ((strInputString == null) || (strInputString.Length == 0))
{
return strInputString;
}
int num4;
int keySize = 0x100;
int blockSize = 0x100;
int length = keySize / 0x10;
if (strKeyString.Length > length)
{
strKeyString = strKeyString.Substring(0, length);
}
if (strKeyString.Length < length)
{
strKeyString = strKeyString.PadRight(length, '#');
}
Encoding.Unicode.GetBytes(strKeyString);
if (myIV.Length > length)
{
myIV = myIV.Substring(0, length);
}
if (myIV.Length < length)
{
myIV = myIV.PadRight(length, '#');
}
Encoding.Unicode.GetBytes(myIV);
byte[] bytes = Encoding.Unicode.GetBytes(strKeyString);
byte[] rgbIV = Encoding.Unicode.GetBytes(myIV);
string str = "";
RijndaelManaged managed = new RijndaelManaged
{
BlockSize = blockSize,
KeySize = keySize
};
MemoryStream stream = new MemoryStream(Encoding.Unicode.GetBytes(strInputString));
MemoryStream stream2 = new MemoryStream();
CryptoStream stream3 = new CryptoStream(stream2, managed.CreateEncryptor(bytes, rgbIV), CryptoStreamMode.Write);
while ((num4 = stream.ReadByte()) != -1)
{
stream3.WriteByte((byte)num4);
}
stream3.Close();
stream2.Close();
stream.Close();
foreach (byte num5 in stream2.ToArray())
{
str = str + num5.ToString("X2");
}
return str;
}
private static string GetMacAddress()
{
string macAddresses = "";
foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
{
if (nic.OperationalStatus == OperationalStatus.Up)
{
macAddresses += nic.GetPhysicalAddress().ToString();
break;
}
}
return macAddresses;
}
答案 1 :(得分：0)
填充可能是Pkcs＃5。而不是＃，用一个字节值填充，这是要填充的字节数。
因此，如果要填充5个字节，填充字节将为0505050505，如果需要填充2个字节，填充将为0202。
答案 2 :(得分：0)
我认为IV不是问题。这是密码本身。我怀疑服务器用来加密的密码不是客户端用来解密的密码。
我能够重现OP报告的崩溃的唯一方法是将错误的密码传递给Decrypt（）方法。传入一个稍微不正确的IV不会引发异常。例如，我用IV作为MAC地址加密并使用冒号进行加密，然后用IV作为相同的MAC地址解密，并使用短划线。 - 前几个字节被加扰，但大约字节16开始所有内容都与纯文本原始文件匹配。
答案 3 :(得分：0)
您在加密时使用与原始字符串相同的字符编码吗？
我遇到了类似的问题......最后，差异在于我是如何传递要加密的数据（字符串）的。如果我复制/粘贴到文本框中，加密方式与我硬编码到程序中的方式不同。简而言之......原始数据的编码会产生很大的不同。虽然字符可能看起来相同，但实际上它们的表示方式可能完全不同（8字节，16字节等）。
了解原始字符串在加密算法之前是如何编码的（也可以检查IV参数编码。