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C++ Class Implementation of HMAC-SHA

, 2 May 2010 CPOL
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C++ class of HMAC-SHA1

Introduction

This is my first article on CodeProject. Sorry for my poor English.

The reason I think it might be helpful that I share this HMAC-SHA1 class is because I found no related source I could refer to. This is a simple C++ class of HMAC-SHA1 with only single byte character support. You could add double bytes character support if needed. You will find this class contains only a function HMAC_SHA1 that accept test input and hash key, then generates a digest.

Background

Thanks to Dominik Reichl, the SHA1 class I wrapped is from his amazing class. I simply implemented the HMAC algorithm on it. For MD5, you could refer to RFC. There is a detailed programming flow of it.

Using the Code

The usage of this class is extremely simple. Declare CHMAC_SHA1, call its HMAC_SHA1 function. That's it!

You may use HMAC-SHA1 in RFC 2202 test case to verify your implementation.

Following is test case 1 in RFC 2202.

#include "HMAC_SHA1.h"
 
BYTE Key[20] ;
BYTE digest[20] ; 

unsigned char *test = "Hi There" ; 
memset(Key, 0x0b, 20) ;
CHMAC_SHA1 HMAC_SHA1 ;
HMAC_SHA1.HMAC_SHA1(test, strlen(test), Key, sizeof(Key), digest) ;
 
// Check with digest equal to 0xb617318655057264e28bc0b6fb378c8ef146be00
// or not

History

  • 2007/12/17: Updated sample code with RFC 2202 test case 1

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Chien-Chung, Chung
Software Developer (Senior)
Taiwan Taiwan
Life is nothing but choices.

Comments and Discussions

 
GeneralMy vote of 5 Pinmembernicklin026-Mar-13 3:57 
QuestionCode Segfaults with messages longer than buffersize minus digestsize PinmemberMember 932791917-Sep-12 6:16 
QuestionIs the digest same as the one computed by C# code ? PinmemberBeckDai12-Apr-12 17:55 
AnswerRe: Is the digest same as the one computed by C# code ? PinmemberChien-Chung, Chung7-May-12 22:49 
Questionthe result is not right Pinmemberhaolifengwang1-Jan-12 18:49 
AnswerRe: the result is not right PinmemberChien-Chung, Chung7-May-12 22:47 
Generalhelp me Pinmemberkalyan41927-Aug-09 18:41 
QuestionError message PinmemberGodwin Ansa5-Aug-08 3:05 
AnswerRe: Error message PinmemberChien-Chung, Chung2-May-10 16:38 
Generalmemset used wrongly PinmemberDante Shamest21-Jul-08 21:06 
GeneralRe: memset used wrongly Pinmemberhetcorp1-Apr-09 4:41 
GeneralRe: memset used wrongly PinmemberJim Chung2-May-10 16:10 
Questionreceiver processing for HMAC-SHA? PinmemberAdam Harding3-Jun-08 12:49 
GeneralBugfix for long key's [modified] Pinmemberbruno19996-Mar-08 3:31 
GeneralThanks Pinmemberbruno19995-Mar-08 9:37 
GeneralRe: Thanks PinmemberGodwin Ansa27-Aug-08 3:01 

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