Objective-C

PBKDF1 - Derive Key from Password

See more Encryption Examples

Demonstrates how to derive a symmetric encryption key from a password using PBKDF1. This example matches the results found at this URL: http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

It also matches the output produced by the .NET Framework using this C# code:

            byte[] salt = new byte[] { 0x78, 0x57, 0x8E, 0x5A, 0x5D, 0x63, 0xCB, 0x06 };
            PasswordDeriveBytes cdk = new PasswordDeriveBytes("password", salt);

            cdk.IterationCount = 1000;
            cdk.HashName = "SHA1";

            // generate a 16-byte key
            byte[] key = cdk.GetBytes(16);

Objective-C

#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 = 1000;
//  Derive a 128-bit key from the password.
int outputBitLen = 128;

//  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 Pbkdf1: 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:
//  DC19847E05C64D2FAF10EBFB4A3D2A20