如何显式地将字符串转换为securestring

Question

我希望在文本框中输入的文本在c#中转换为securestring,感谢您提前回答.

Answer 1

最简单的方法是迭代源字符串并一次将一个字符附加到安全字符串,如下所示:

var secure = new SecureString();
foreach (char c in textbox1.Text)
{
    secure.AppendChar(c);
}

Answer 2

发明一次并重复使用批次.创建一个简单的扩展方法来扩展字符串基类并在某处存储一些静态实用程序类

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();

Answer 3

你应该只读取SecureString.所以代码应如下所示:

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;
    }
}