Attempt at SHA256 in C

Compiling

Compile with `gcc -Wall -lssl -lcrypto shait.c`

shait.c

// Compile with:
//    gcc shait.c -lssl -lcrypto
#include <stdio.h>
#include <openssl/sha.h>
 
int main(int argc,char **argv)
{
  SHA256_CTX context;
  unsigned char md[SHA256_DIGEST_LENGTH];
  int j;
 
  SHA256_Init(&context);
  SHA256_Update(&context, "hello world", 11);
  SHA256_Final(md, &context);
 
  printf("\n\n");
  printf("Output should be: b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9\n");
  printf("Output is       : ");
  for (j=0;j<SHA256_DIGEST_LENGTH;j++) printf("%02x", md[j]);
  printf("\n\n");
 
  return 0;
}