Objective-C

Demonstrates the MacString Method

Demonstrates the MacString method to do HMAC-SHA256, HMAC-SHA1, and HMAC-MD5. Objective-C

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

// This example assumes Chilkat Crypt2 to have been previously unlocked.
// See Unlock Crypt2 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";

CkoBinData *binData = [[CkoBinData alloc] init];
NSData macBytes;

crypt.HashAlgorithm = @"SHA-256";
macBytes = [crypt MacString: sData];
[binData Clear];
[binData AppendBinary: macBytes];
NSLog(@"%@%@",@"HMAC_SHA256: ",[binData GetEncoded: @"hex"]);

crypt.HashAlgorithm = @"MD5";
macBytes = [crypt MacString: sData];
[binData Clear];
[binData AppendBinary: macBytes];
NSLog(@"%@%@",@"HMAC_MD5: ",[binData GetEncoded: @"hex"]);

crypt.HashAlgorithm = @"SHA-1";
macBytes = [crypt MacString: sData];
[binData Clear];
[binData AppendBinary: macBytes];
NSLog(@"%@%@",@"HMAC_SHA1: ",[binData GetEncoded: @"hex"]);

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