rfc2898

Converting .Net decryption to Java

由 ▼魔方 西西 提交于 2021-02-08 08:23:51
问题 Currently I'm working on a project where they use AES encryption with RFC2898 derived bytes. This the decryption method that I've provided. Now I need to implement it in java. private string Decrypt(string cipherText) { string EncryptionKey = "MAKV2SPBNI657328B"; cipherText = cipherText.Replace(" ", "+"); byte[] cipherBytes = Convert.FromBase64String(cipherText); using (Aes encryptor = Aes.Create()) { Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61

How does RFC2898DeriveBytes generate an AES key?

由 余生长醉 提交于 2021-01-27 04:42:29
问题 I saw some code like string password = "11111111"; byte[] salt = Encoding.ASCII.GetBytes("22222222"); Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(password, salt); RijndaelAlg.Key = key.GetBytes(RijndaelAlg.KeySize / 8); I can see the key is generated by Rfc2898DeriveBytes with passphrase and salt. Then AES retrieves the key by GetBytes. But the question is, what does RFC2898DeriveBytes do and what key.GetBytes(cb) do? Could anyone elaborate this? I couldn't get it from the documentation.

Does salt need to be random to secure a password hash?

由 房东的猫 提交于 2020-01-03 08:32:30
问题 I know very little about security (I need to find a basic explanation of the basics) and am trying to come up with a reasonable way to store user passwords in a database using .Net. Here's my current solution: private static byte[] HashPassword(string password) { using (var deriveBytes = new Rfc2898DeriveBytes(password, 10)) { byte[] salt = deriveBytes.Salt; byte[] key = deriveBytes.GetBytes(20); return salt.Concat(key).ToArray(); //Return Salt+Key } } I store the results of HashPassword() in

Why do I need to use the Rfc2898DeriveBytes class (in .NET) instead of directly using the password as a key or IV?

由 家住魔仙堡 提交于 2019-12-17 07:02:19
问题 What is the difference between using Rfc2898DeriveBytes and just using Encoding.ASCII.GetBytes(string object); ? I have had relative success with either approach, the former is a more long winded approach where as the latter is simple and to the point. Both seem to allow you to do the same thing eventually but I am struggling to the see the point in using the former over the latter. The basic concept I have been able to grasp is that you can convert string passwords into byte arrays to be

JavaScript: How to generate Rfc2898DeriveBytes like C#?

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-09 10:15:10
问题 EDIT: Per discussion in the comments, let me clarify that this will be happening server side, behind SSL. I do not intend to expose the hashed password or the hashing scheme to the client. Assume we have an existing asp.net identity database with the default tables (aspnet_Users, aspnet_Roles, etc.). Based on my understanding, the password hashing algorithm uses sha256 and stores the salt + (hashed password) as a base64 encoded string. EDIT: This assumption is incorrect, see answer below. I

RFC2898DeriveBytes implementation in Java

由 对着背影说爱祢 提交于 2019-12-06 17:30:56
问题 I have to decrypt a string encrypted in C# as a part of our project. This decryption is done using AES algorithm and packing mode as PKCS7. For generating the initialization vector they have used the following: Rfc2898DeriveBytes keyGenerator = new Rfc2898DeriveBytes("somestring", salt); The salt is the default bytes. This IV is used in encrypting the string using AES. I have read through some documents and found that AES can be implemented in Java. But not sure on how to pass the IV and

RFC2898DeriveBytes implementation in Java

由 て烟熏妆下的殇ゞ 提交于 2019-12-04 22:45:48
I have to decrypt a string encrypted in C# as a part of our project. This decryption is done using AES algorithm and packing mode as PKCS7. For generating the initialization vector they have used the following: Rfc2898DeriveBytes keyGenerator = new Rfc2898DeriveBytes("somestring", salt); The salt is the default bytes. This IV is used in encrypting the string using AES. I have read through some documents and found that AES can be implemented in Java. But not sure on how to pass the IV and packing mode. Also, I have seen that there are modes CBC, ECB for mentioning the Cipher block mode. I am

PasswordDeriveBytes vs Rfc2898DeriveBytes, Obsolete but way faster

由 心不动则不痛 提交于 2019-12-02 19:16:37
I'm working on a encryption functionality based on classes inherited from SymmetricAlgorithm such as TripleDes, DES, etc. Basically there're two options to generate consistent key and IV for my algorithm class, PasswordDeriveBytes and Rfc2898DeriveBytes , both inherit from DeriveBytes abstract class. The PasswordDeriveBytes.GetBytes() method is marked as obsolete in .NET framework while Rfc2898DeriveBytes.GetBytes() is recommended, as it matches the PBKDF2 standard. However, based on my testing, calling the same GetBytes() method in Rfc2898DeriveBytes class is almost 15 times slower than that

PBKDF2 implementation in C# with Rfc2898DeriveBytes

由 霸气de小男生 提交于 2019-11-30 06:20:42
问题 Guys, I'm trying to implement a PBKDF2 function in C# that creates a WPA Shared key. I've found some here: http://msdn.microsoft.com/en-us/magazine/cc163913.aspx that seems to produce a valid result, but it's one byte too short... and the wrong PSK value. To test the output, I am comparing it to this: http://www.xs4all.nl/~rjoris/wpapsk.html or http://anandam.name/pbkdf2/ I did find one way of getting this to work with a built in library to C# called Rfc2898DeriveBytes. Using this, I get a

How to encrypt in VBScript using AES?

由 丶灬走出姿态 提交于 2019-11-28 09:16:57
I am looking to encrypt some data using Rijndael/AES in VBScript using a specific key and IV value. Are there any good function libraries or COM components that would be good to use? I looked at CAPICOM ; it allows a passphrase only, and won't allow setting specific key and IV values. Old question- that really never gets old! One way is to declare encryption classes within vbscript, without needing external added COM objects or wrapper. The following example takes a string, encrypts and decrypts using Rijndael managed class: '----------------------------------------------------- Dim obj,arr,i
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