(Objective-C) Password_Digest = Base64 (SHA-1 ( nonce + created + SHA-1 (password) ) )

Demonstrates how to compute:

Password_Digest = Base64 (SHA-1 ( nonce + created + SHA-1 (password)))

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#import <NSString.h>
#import <CkoCrypt2.h>
#import <CkoPrng.h>
#import <CkoBinData.h>
#import <CkoDateTime.h>

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

NSString *password = @"secret";

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
crypt.HashAlgorithm = @"SHA-1";
crypt.EncodingMode = @"base64";

// Generate a 16-byte random nonce
CkoPrng *prng = [[CkoPrng alloc] init];
CkoBinData *bd = [[CkoBinData alloc] init];
[prng GenRandomBd: [NSNumber numberWithInt: 16] bd: bd];

// Get the current date/time in a string with this format: 2010-06-08T07:26:50Z
CkoDateTime *dt = [[CkoDateTime alloc] init];
[dt SetFromCurrentSystemTime];
NSString *created = [dt GetAsTimestamp: NO];
[bd AppendString: created charset: @"utf-8"];

// This example wishes to calculate a password digest like this:
// Password_Digest = Base64 ( SHA-1 ( nonce + created + SHA-1(password) ) )

// First SHA-1 digest the password...
NSString *passwordSha1 = [crypt HashStringENC: password];
// Append the 20 binary bytes of the SHA1 hash to bd, which already contains the nonce and created date/time.
[bd AppendEncoded: passwordSha1 encoding: @"base64"];

NSString *passwordDigest = [crypt HashBdENC: bd];

NSLog(@"%@%@",@"Base64 password digest = ",passwordDigest);