我希望在文本框中输入的文本在c#中转换为securestring。
最简单的方法是迭代源字符串,每次向安全字符串附加一个字符,如下所示:
var secure = new SecureString();
foreach (char c in textbox1.Text)
{
secure.AppendChar(c);
}
一次发明,多次重复使用。创建一个简单的扩展方法来扩展字符串基类,并将其存储在的某个静态实用程序类中
using System.Security;
/// <summary>
/// Returns a Secure string from the source string
/// </summary>
/// <param name="Source"></param>
/// <returns></returns>
public static SecureString ToSecureString(this string source)
{
if (string.IsNullOrWhiteSpace(source))
return null;
else
{
SecureString result = new SecureString();
foreach (char c in source.ToCharArray())
result.AppendChar(c);
return result;
}
}
然后调用如下:
textbox1.Text.ToSecureString();
您应该将SecureString设置为只读。所以代码应该是这样的:
static class SecureStringExtensions
{
public static string ToUnsecureString(this SecureString secureString)
{
if (secureString == null) throw new ArgumentNullException("secureString");
var unmanagedString = IntPtr.Zero;
try
{
unmanagedString = Marshal.SecureStringToGlobalAllocUnicode(secureString);
return Marshal.PtrToStringUni(unmanagedString);
}
finally
{
Marshal.ZeroFreeGlobalAllocUnicode(unmanagedString);
}
}
public static SecureString ToSecureString(this string unsecureString)
{
if (unsecureString == null) throw new ArgumentNullException("unsecureString");
return unsecureString.Aggregate(new SecureString(), AppendChar, MakeReadOnly);
}
private static SecureString MakeReadOnly(SecureString ss)
{
ss.MakeReadOnly();
return ss;
}
private static SecureString AppendChar(SecureString ss, char c)
{
ss.AppendChar(c);
return ss;
}
}
可能有点晚,但您可以通过这种方式将SecureString转换为String
using System.Security;
.
.
.
/// <summary>
/// Converts String to SecureString
/// </summary>
/// <param name="input">Input in String</param>
/// <returns>Input in SecureString</returns>
public SecureString String2SecureString(String input) {
SecureString _output = new SecureString();
input.ToCharArray().ToList().ForEach((q) => _output.AppendChar(q));
return _output;
}
尽管这与Balazs Tihanyi的答案一样:
谷歌是你的朋友。。。
var secure = new SecureString(); foreach(char c in textbox1.Text) { secure.AppendChar(c); }
我很高兴没有人提到SecureString构造函数将指针指向char数组。
public static SecureString ToSecureString(this string source)
{
char[] charArray = source.ToCharArray();
unsafe
{
fixed (char* chars = charArray)
{
return new SecureString(chars, charArray.Length);
}
}
}
请注意,此代码仅适用于/unsafe
编译器选项。若要设置此选项,请转到项目属性的"生成"选项卡,然后选中"允许不安全代码"复选框。
几乎相同,但更短:
SecureString secureString = new SecureString();
textbox1.Text.ToCharArray().ForEach(c => secureString.AppendChar(c));
将其用于文本框上的事件处理程序:
private void textbox1_TextChanged(object sender, EventArgs e)
{
SecureString newSecureTextBox = new SecureString();
foreach (char c in textbox1.Text.ToCharArray())
{
newSecureTextBox.AppendChar(c);
}
}
通常将变量调用为newSecureTextBox