Objective-C

Demonstrates HMAC SHA256

See more Encryption Examples

Demonstrates HMAC-SHA256. Also demonstrates HMAC-SHA1 and HMAC-MD5. Objective-C

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

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

// Demonstrates how to reproduce the following results found at
// https://en.wikipedia.org/wiki/Hash-based_message_authentication_code

// HMAC_SHA256("key", "The quick brown fox jumps over the lazy dog") = 0xf7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8
// HMAC_MD5("key", "The quick brown fox jumps over the lazy dog")    = 0x80070713463e7749b90c2dc24911e275
// HMAC_SHA1("key", "The quick brown fox jumps over the lazy dog")   = 0xde7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9

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

crypt.MacAlgorithm = @"hmac";
crypt.EncodingMode = @"hex";
[crypt SetMacKeyString: @"key"];
NSString *sData = @"The quick brown fox jumps over the lazy dog";

crypt.HashAlgorithm = @"SHA-256";
NSLog(@"%@%@",@"HMAC_SHA256: ",[crypt MacStringENC: sData]);

crypt.HashAlgorithm = @"MD5";
NSLog(@"%@%@",@"HMAC_MD5: ",[crypt MacStringENC: sData]);

crypt.HashAlgorithm = @"SHA-1";
NSLog(@"%@%@",@"HMAC_SHA1: ",[crypt MacStringENC: sData]);

// The output is the same (ignore case)
// HMAC_SHA256: F7BC83F430538424B13298E6AA6FB143EF4D59A14946175997479DBC2D1A3CD8
// HMAC_MD5: 80070713463E7749B90C2DC24911E275
// HMAC_SHA1: DE7C9B85B8B78AA6BC8A7A36F70A90701C9DB4D9