(Objective-C) HMAC SHA-1 Matching FIPS Examples

Provides an example of computing an HMAC-SHA1 digest to duplicate the FIPS examples at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf

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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 *strToSign = @"Sample #1";

// 64-byte key
NSString *key = @"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f";

// The expected result:
// (from Appendix A.1 at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf )
NSString *expectedResult = @"4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a";

// Here is the code to duplicate the results:
crypt.HashAlgorithm = @"sha-1";
crypt.EncodingMode = @"hex";

[crypt SetHmacKeyEncoded: key encoding: @"hex"];

NSString *mac = 0;
mac = [crypt HmacStringENC: strToSign];

NSLog(@"%@%@",@"Computed: ",mac);
NSLog(@"%@%@",@"Expected: ",expectedResult);