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C++ code in LINUX

Programming Project 3

Requirement: In this project you will implement HMAC (Keyed-hash Message Authentication Code) using SHA-512 as the building block. HMAC with key K of a input message M can be expressed as:

where is the key padded out to block size, which is 1024 bits when we use SHA-512. Here, opad, ipad are specified padding constants, which is specified as follows:

ipad:00110110 (36 in hexidecimal) repeated by 1024/8=128 times;

opad:01011100 (5C in hexidecimal) repeated by 1024/8=128 times.

We can describe the HMAC algorithm as follows:

1. Append zeros to the end of K to create a b-bit string (e.g., if K is of length 160 bits, and b = 1024 bits, then K will be appended with 864 bits of zeros to the end of K).

2. XOR (bitwise exclusive-or ) with ipad to produce b-bit block Si.

3. Append input message M to Si.

4. Apply hash to the stream generated in step 3.

5. XOR with opad to produce the b-bit block So.

6. Append the hash output from step 4 to So.

7. Apply hash to the stream generated in step 6 to produce the output of HMAC.

After computing the HMAC with key K of an input message M, print it on the screen in hexadecimal format, also store the HMAC output in the output file. Your program should take three arguments: an input file name, an output HMAC file, and a key. For example, you may use the following command to compute an HMAC for the file "text1", with the HMAC output stored in the file text1-hmac, using the key hmac123456: HMAC_gen text1 text1-hmac hmac123456.

If you want to use a longer key, like a key more than 512 bits, it is recommended that you put the key in a file. (Optional: you can use SHA-512 to hash the key entered in the command line to get a longer key to be used in the HMAC algorithm).

You do not need to implement SHA-512 yourself. For an implementation of SHA-512, you can use an existing crypto library, Crypto++ (C++) in this project, which is installed on the virtual machine. While you are using the built-in SHA-512 functions provided by Crypto++ library, you are required to implement HMAC yourself in this program assignment. The tutorial about how to use the SHA-512 function of Crypto++ library is provided in the end of this document.

You can find 5 test files: MSG1, MSG2, MSG3, text1, and hw2.pdf.gz. Please copy all those files to your directory.

Tutorial to use the SHA-512 function in the crypto library Crypto++:

1. In order to use the crypto library, in your C++ source program (e.g., [url removed, login to view]), you need to include the right library files, and use the right namespace as follows.

#include "cryptopp/cryptlib.h"

#include "cryptopp/hex.h"

#include "cryptopp/filters.h"

#include "cryptopp/sha.h"

#include "cryptopp/des.h"

#include "cryptopp/aes.h"

#include "cryptopp/modes.h"

2. How to compile your source program:

g++ -o test1 -L. [url removed, login to view] -lcryptopp

-L. : search library file in current directory and the specified directories.

-lcryptopp : link CryptoPP library.

Here, [url removed, login to view] is the source cpp file name to be compiled.

3. The tool function to perform SHA-512 is illustrated as follows.

string sha_digest(string & plain)

{

string sha512digest;

SHA512 hash;

StringSource(plain, true, new HashFilter(hash, new StringSink(sha512digest) ) );

return sha512digest;

}

4. Using the following function call to compute the hash output of the input message:

string output512digest = sha_digest(plain)

Here, plain is the input message stored in a string.

Beceriler: C Programlama, Linux

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