#include <stdio.h>
#include <string.h>
#include <openssl/sha.h>
#include <openssl/crypto.h>

#ifndef OPENSSL_NO_SHA1
unsigned char *SHA1(const unsigned char *d, size_t n, unsigned char *md)
	{
	SHA_CTX c;
	static unsigned char m[SHA_DIGEST_LENGTH];

	if (md == NULL) md=m;
	if (!SHA1_Init(&c))
		return NULL;
	SHA1_Update(&c,d,n);
	SHA1_Final(md,&c);
	OPENSSL_cleanse(&c,sizeof(c));
	return(md);
	}
#endif