pkcs#5

I need to decrypt text encrypted using AES/CBC/PKCS5Padding scheme. The encrypted text I got was generated using some Java software. All values below are changed by me to something fictional. What I get is a Key aHjgYFutF672eGIUGGVlgSETyM9VJj0K (256-bit = 32-chars * 8-bit) and IV: rxYoks3c8hRRsL2P (16-bit) and (I supposed) Base64 encoded encrypted result ETlAHS5ZcshKxQUaHVB8== What I need is to decrypt in Ruby this ETlAHS5ZcshKxQUaHVB8== to get in the and a simple string, like 'blablablabla' I tried to decrypt what I got using both Ruby and just common linux console openssl command. NOTE: Key

This is the code I use to "hash" (or derive key as called in the PBKDF2 implementation of the PKCS standard) passwords strings with the Rfc2898DeriveBytes class provided in .NET: int saltSize = 256; int iterations = 1000; int keySize = 20; // The parameter I'm not sure of var deriveBytes = new Rfc2898DeriveBytes("mypassword", saltSize, iterations); byte[] salt = deriveBytes.Salt; byte[] key = deriveBytes.GetBytes(keySize); Now, I understand that the salt size doesn't matter much (as long as it is enough to ensure that random salts will be unique), but what about the key size? Does a longer key

I'm trying to understand some C#-code, I have been handed, which deals with cryptography, and specifically uses PasswordDeriveBytes from System.Security.Cryptography . In the .NET docs , it says that PasswordDeriveBytes uses "an extension of the PBKDF1 algorithm" which is later in the document specified as "the PKCS#5 v2.0 standard", which is PBKDF2 (as far as I can tell). Everywhere on the net I've found (including here on Stack Exchange), though, everyone says "use Rfc2898DeriveBytes, cause Password* is deprecated and uses PBKDF1". But the only difference in the docs at msdn.microsoft.com

I would like to know in the following code if PKCS#5 padding is added ? If not how to add ? $message = "insert plaintext message here"; $iv = pack('H*', 'insert hex iv here'); $key = pack('H*', 'insert hex key here'); $enc = mcrypt_encrypt(MCRYPT_DES, $key, $message, MCRYPT_MODE_CBC, $iv); echo bin2hex($enc); I also want to create a PHP code to decrypt a string created with DES/CBC/PKCS5Padding. I think the above mentioned code can be modified to get a decryption. The important thing for me is to get the PKCS#5 Padding and Unpadding script. No, it is not added. Unfortunately PHP / mcrypt uses

I dont know how to use the "salt concept" in my scenario. Suppose I have a client desktop application that encrypts data for specific users and send it to a remote server. The client application generate a key with PKCS#5, with the user's password and a SALT. The remote desktop must NEVER be in contact with the user's password. Suppose we generate a random salt for an encryption. The client application can encrypt the data, and sent it to the remote server. If the user try to access his data on another computer, how will it be able to decrypt it since the salt is unknown? I think that using

Can some point me in the right direction? I'd like to use JCE/JCA to derive a new key from a master secret key, How can I achieve this? Regards. The JCA provides standard password-based key derivation functions like PBKDF2 defined in PKCS#5 v2.0 and RFC 2898 . This algorithm creates some random material from a master secret (a password) in order to generate a key suitable for a given cipher. public byte[] deriveKey(String password, byte[] salt, int keyLen) { SecretKeyFactory kf = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1"); KeySpec specs = new PBEKeySpec(password.toCharArray(), salt,

I use the following code to initialize encryption... Dim symmetricKey As New System.Security.Cryptography.RijndaelManaged() With symmetricKey .Key = Encoding.ASCII.GetBytes(Key) .IV = Encoding.ASCII.GetBytes(IV) .Mode = CipherMode.CBC .BlockSize = 128 .KeySize = 128 .Padding = PaddingMode.PKCS7 End With The requirement is to use PKCS5. Padding modes in vb.net only include ANSIX923 ISO10126 None PKCS7 Zeros So I don't think there is a method for PKCS5. Is there any way to add it, or do I need to write an encryption method myself? If so - how do I write that? Is there a reliable DLL that will