(Objective-C) PBKDF2 - Derive Key from Password

Demonstrates how to derive a symmetric encryption key from a password using PBKDF2. This example matches the results found at this URL: http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

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#import <CkoCrypt2.h>
#import <NSString.h>

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

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];

NSString *hexKey = 0;
// http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

NSString *pw = @"password";
NSString *pwCharset = @"ansi";
// Hash algorithms may be: sha1, md2, md5, etc.
NSString *hashAlg = @"sha1";
// The salt should be 8 bytes:
NSString *saltHex = @"78578E5A5D63CB06";
int iterationCount = 2048;
// Derive a 192-bit key from the password.
int outputBitLen = 192;

// 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.)
NSString *enc = @"hex";

hexKey = [crypt Pbkdf2: pw charset: pwCharset hashAlg: hashAlg salt: saltHex iterationCount: [NSNumber numberWithInt: iterationCount] outputKeyBitLen: [NSNumber numberWithInt: outputBitLen] encoding: enc];

NSLog(@"%@",hexKey);

// The output should have this value:
// BFDE6BE94DF7E11DD409BCE20A0255EC327CB936FFE9364