B4X

PBKDF2 - Derive Key from Password

See more Encryption Examples

Demonstrates how to derive a symmetric encryption key from a password using PBKDF2. B4X

'  This example assumes the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim crypt As ChilkatCrypt2
crypt.Initialize("crypt")

Dim pw As String = "password"

Dim pwCharset As String = "utf-8"

'  Such as sha256, sha512
Dim hashAlg As String = "sha256"

'  16 bytes
Dim saltHex As String = "78578E5A5D63CB0668AB39B21C8637FA"

Dim iterationCount As Int = 100000

'  Derive a 256-bit key from the password.
Dim outputBitLen As Int = 256

'  The derived key is returned as a hex or base64 encoded string.
'  (Note: The salt argument must be a string that also uses
'  the same encoding.)
Dim enc As String = "hex"

Dim hexKey As String = crypt.Pbkdf2(pw, pwCharset, hashAlg, saltHex, iterationCount, outputBitLen, enc)

Log(hexKey)

'  Sample output:
'  AE96E261E32792D0FD6F0E72F8E872D046F7DB4C1FA7C83892EC73C49F461B70