我是密码学新手,我不太清楚我在这里做错了什么,
public static byte[] EncryptData(byte[] data, string keystr)
{
if (keystr.Length > 32)
keystr = keystr.Substring(0, 32);
else
while (keystr.Length != 32)
keystr += "0";
byte[] iv = Encoding.UTF8.GetBytes(SALT);
byte[] key = Encoding.UTF8.GetBytes(keystr);
using (MemoryStream memoryStream = new MemoryStream())
{
using (RijndaelManaged rijndaelManaged = new RijndaelManaged { Key = key, IV = iv, Padding = PaddingMode.PKCS7, Mode = CipherMode.CBC })
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, rijndaelManaged.CreateEncryptor(key, iv), CryptoStreamMode.Write))
{
cryptoStream.Write(data, 0, data.Length);
}
}
return memoryStream.ToArray();
}
}
public static byte[] DecryptData(byte[] data, string keystr)
{
if (keystr.Length > 32)
keystr = keystr.Substring(0, 32);
else
while (keystr.Length != 32)
keystr += "0";
byte[] iv = Encoding.UTF8.GetBytes(SALT);
byte[] key = Encoding.UTF8.GetBytes(keystr.ToUpper());
using (MemoryStream memoryStream = new MemoryStream())
{
using (RijndaelManaged rijndaelManaged = new RijndaelManaged { Key = key, IV = iv, Padding = PaddingMode.PKCS7, Mode = CipherMode.CBC })
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, rijndaelManaged.CreateDecryptor(key, iv), CryptoStreamMode.Write))
{
cryptoStream.Write(data, 0, data.Length);
}
}
return memoryStream.ToArray();
}
}
正如您所看到的,我传递了一个字节数组和一个密码。我确保密码总是32个字符。
我在解密数据时获得Padding is invalid and cannot be removed.
。
钥匙和盐总是一样的。
答案 0 :(得分:2)
key
可以同时传递给两种方法,但出于某种原因,在你丢弃更多熵(用于更长的字符串)或填充键(用于更短的字符串)之后,对于某些方法你这样做的原因:
keystr.ToUpper()
但仅限于解密方面。所以使用的密钥是不同的。
我强烈建议您不要致电ToUpper
。其他建议可能是没有固定的salt / IV,并且允许iv和key也作为字节数组传递,而不是strings
。加密自然会处理字节数组,并且实际上鼓励加密较弱的这些包装器方法可能是一个坏主意。