Pbe.Kdf2(Int32, Byte[], Byte[], Int32, HashAlgorithm) Method

Derive a key of any length from a password using the PBKDF2 algorithm from PKCS #5 v2.1.

Syntax

public static byte[] Kdf2(
   int dkLen,
   byte[] pwdBytes,
   byte[] salt,
   int count,
   HashAlgorithm hashAlg = HashAlgorithm.Sha1 
)

Public Shared Function Kdf2 (
   dkLen As Integer,
   pwdBytes As Byte(),
   salt As Byte(),
   count As Integer,
   Optional hashAlg As HashAlgorithm = HashAlgorithm.Sha1 
) As Byte()

Parameters

dkLen  Int32

Required length of key in bytes

pwdBytes  Byte

Password in byte format

salt  Byte

Salt in byte format

count  Int32

Iteration count

hashAlg  HashAlgorithm  (Optional)

Hash algorithm to use in HMAC PRF (default is SHA-1)

Return Value

Example

// Use PBKDF2 with SHA-256 hash function to derive 192-bit key
// convert password string to bytes
byte[] pwd = System.Text.Encoding.Default.GetBytes("password");
// make a salt
byte[] salt = new byte[] { 0x78, 0x57, 0x8e, 0x5a, 0x5d, 0x63, 0xcb, 0x06 };
int n = 24;
byte[] key = Pbe.Kdf2(n, pwd, salt, 2048, HashAlgorithm.Sha256);
Console.WriteLine("Key({0})={1}", n * 8, key.ToHex());
// Key(192)=97B5A91D35AF542324881315C4F849E327C4707D1BC9D322

See Also

VB6/C equivalent: PBE_Kdf2

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