Created
October 3, 2014 06:57
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SHA256 Hashing Challenge Program
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <iostream> | |
#include <openssl/sha.h> | |
static const char alphabet[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; | |
int main(){ | |
srand (time(NULL)); | |
//printf("%d\n",SHA256_DIGEST_LENGTH); | |
unsigned char hash[SHA256_DIGEST_LENGTH]; | |
const int N = 4000000; | |
const int M = 12; | |
char randString[M]; | |
char maxHash[M]; | |
int maxVal=0; | |
int i; | |
for(i=0;i<N;i++){ | |
int j; | |
for (j=0;j<M;j++) { | |
randString[j] = alphabet[rand() % (sizeof(alphabet) - 1)]; | |
} | |
randString[M] = 0; | |
SHA256_CTX sha256; | |
SHA256_Init(&sha256); | |
SHA256_Update(&sha256, randString, M); | |
SHA256_Final(hash, &sha256); | |
j=0; | |
while(hash[j]==0){ | |
j++; | |
} | |
if(j>maxVal){ | |
maxVal = j; | |
for(j=0;j<M;j++){ | |
maxHash[j] = randString[j]; | |
} | |
printf("%s\t%d\t",maxHash,maxVal); | |
for(j=0;j<SHA256_DIGEST_LENGTH;j++){ | |
printf("%x", hash[j]); | |
} | |
printf("\n"); | |
} | |
} | |
return 0; | |
} |
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