First, open hash.h file and read it. Create a file named hash.c and write the following functions: • SHA_40, which takes a message of arbitrary length and generated a 40-bit hash value using the sha_40 algorithm • digest_equal, which indicates whether or not two digests are equal • main, which tests the functions above
First, open hash.h file and read it. Create a file named hash.c and write the following functions: • SHA_40, which takes a message of arbitrary length and generated a 40-bit hash value using the sha_40 algorithm • digest_equal, which indicates whether or not two digests are equal • main, which tests the functions above
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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**WITH THESE GIVEN FUNCTIONS**

Transcribed Image Text:First, open hash.h file and read it. Create a file named hash.c and write the following functions:
• SHA_40, which takes a message of arbitrary length and generated a 40-bit hash value
using the sha_40 algorithm
• digest_equal, which indicates whether or not two digests are equal
main, which tests the functions above

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define DIGEST_SIZE 5 //The size of SHA_40 hash in bytes
#define BLOCK_SIZE sizeof(struct Block) // Block size in bytes
#define BYTE unsigned char // if you want use BYTE in place of unsigned char
Estruct Digest {
BYTE hashe, hash1, hash2, hash3, hash4;
unsigned char* sha_40(const unsigned char* data, size_t size) {
int digest_equal (struct Digest* digestl, struct Digest* digest2) { //return 1 (true) or 0 (false)
Bint is_digest_low(struct Digest* digest) { // used by mine_block
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