How to pass long string as password in windows credentials in C#?

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1.00/5 (2 votes)

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I am getting exception while passing a long string to save to the windows vault folder using c# and Credential Manager API. Else it is getting saved successfully to the vault.

Exception coming is

Specified argument was out of the range of valid values.

Parameter name: The password has exceeded 512 bytes.

&

password string passed is "TERRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRTGVBFXDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDTREEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEECFGBBCVBDRFGDXFXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXRETWEREWRW3ERWERWRWRWRRRRRRRRRRRRRRRRRRRRRFDSFFFSDFSFSFSFDSFDDFSFSFSFGRWERWREWRWRWRDXVGFDGFDGFDGFDGDGDFGDGDGDREWRWREWRERRWREWREWRDXVCXBCVVVVVVVVVVVVVVREWRWERRRRRRRRRRREWRWRWREWR"

What I have tried:

public void SavePassword(string password)
       {
           try
           {
               using (var cred = new Credential())
               {
                   cred.Password = password;
                   cred.Target = PasswordName;
                   cred.Type = CredentialType.Generic;
                   cred.PersistanceType = PersistanceType.LocalComputer;
                   cred.Save();
               }
           }
           catch(Exception ex)
           {

           }

       }

Posted 18-May-18 1:31am

ranio

Updated 3-Nov-21 21:44pm

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Comments

GKP1992 18-May-18 7:39am

Just me or the password string goes on and on in a single line overflowing the CP page?Chrome by the way.

Richard Deeming 18-May-18 9:40am

It's not just you. The browser can't find an obvious place to break the line, so without word-wrap: break-word; on the containing <div>, it won't wrap onto a new line.

GKP1992 21-May-18 0:22am

Why do you need to have such a long password anyway? Can a user ever remember that?

2 solutions

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User 7429338 · Answer 1 · 2018-05-18T01:43:00

Solution 1

Parameter name: The password has exceeded 512 bytes.

Your password is 600 bytes long and the maximum allowed is 512.

Posted 18-May-18 1:43am

User 7429338

Comments

ranio 4-Jun-18 3:11am

So what is the solution for saving public key content length greater than 512 bytes long. Can I split the same say 500 bytes each and then save to the vault and retrieve concatenating the splited vault values altogether.

Is this split option possible or Is there any better option to do the same ?

black RAT 2021 · Answer 2 · 2021-11-03T21:44:00

Install

Meziantou.Framework.Win32.CredentialManager

and follow these steps.

// Save the credential to the credential manager
CredentialManager.WriteCredential(
    applicationName: "CredentialManagerTests",
    userName: "meziantou",
    secret: "Pa$$w0rd",
    comment: "Test",
    persistence: CredentialPersistence.LocalMachine);

// Get a credential from the credential manager
var cred = CredentialManager.ReadCredential(applicationName: "CredentialManagerTests");
Console.WriteLine(cred.UserName);
Console.WriteLine(cred.Password);

// Delete a credential from the credential manager
CredentialManager.DeleteCredential(applicationName: "CredentialManagerTests");