[英]Visual C# Independant Decryption Error: length of data to decrypt is invalid
在我的可視C#加密/解密程序中,我嘗試獨立加密和解密,同時嘗試解密以前的加密數據,但我得到一段要解密的數據是無效錯誤
String filename;
String filename2;
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
if (ofd.ShowDialog() == DialogResult.OK) {
filename = ofd.FileName;
textBox1.Text = filename;
button2.Enabled = true;
}
}
private void button2_Click(object sender, EventArgs e)
{
StreamReader sr = new StreamReader(filename);
String toencrypt = sr.ReadToEnd();
sr.Dispose();
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
UTF8Encoding utf8 = new UTF8Encoding();
TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
tripleDES.Key = md5.ComputeHash(utf8.GetBytes(toencrypt));
tripleDES.Mode = CipherMode.ECB;
tripleDES.Padding = PaddingMode.PKCS7;
ICryptoTransform trans = tripleDES.CreateEncryptor();
String encrypted = BitConverter.ToString(trans.TransformFinalBlock(utf8.GetBytes(textBox2.Text), 0, utf8.GetBytes(textBox2.Text).Length));
StreamWriter sw = new StreamWriter(filename);
sw.Write(encrypted);
sw.Dispose();
}
private void button3_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
if (ofd.ShowDialog() == DialogResult.OK)
{
filename2 = ofd.FileName;
textBox3.Text = filename2;
button4.Enabled = true;
}
}
private void button4_Click(object sender, EventArgs e)
{
StreamReader sr = new StreamReader(filename2);
String todecrypt = sr.ReadToEnd();
sr.Dispose();
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
UTF8Encoding utf8 = new UTF8Encoding();
TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
tripleDES.Key = md5.ComputeHash(utf8.GetBytes(textBox4.Text));
tripleDES.Mode = CipherMode.ECB;
tripleDES.Padding = PaddingMode.PKCS7;
ICryptoTransform trans = tripleDES.CreateDecryptor();
String decrypted = BitConverter.ToString(trans.TransformFinalBlock(utf8.GetBytes(todecrypt), 0, utf8.GetBytes(todecrypt).Length));
StreamWriter sw = new StreamWriter(filename2);
sw.Write(decrypted);
sw.Dispose();
}
基本上我想在這里做的是打開一個txt文件,將數據加密到里面(可以正常工作),然后解密(得到錯誤),當它給我錯誤時我不知道要更改為什么解決此問題,因為數據長度使用相同的鍵和填充以及所有其他適用的方法...
首先:
String encrypted = BitConverter.ToString(trans.TransformFinalBlock(utf8.GetBytes(textBox2.Text), 0, utf8.GetBytes(textBox2.Text).Length));
字符串“ encrypted”的格式為
0C-4C-9B-01-00-0D-81-EC-D6-C5-2C-9A-EC-CE-08-95
但是,您嘗試解密格式化字符串的Utf8字節。 那失敗了; 而且大多數情況下是由於長度不正確。 您想使用BitConverter而不是Utf8將字符串轉換為字節數組。
除此之外:1)不要使用ECB 2)一定要使用IV 3)使用文件的哈希值,因為密鑰最多是可疑的
編輯:格式化
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