#include <string.h>
#include <misc.h>
#include <openssl/sha.h>

static char misc_tohex(unsigned n)
{
	if (n >= 10){
		return n-10+'A';
	}else{
		return n+'0';
	}
}

/*
	Compute the SHA digest of a string and store it in hex form in res
*/
void misc_sha (
	const char *s,
	SSTRING &res)
{
	unsigned char tmp[SHA_DIGEST_LENGTH];
	SHA1 ((const unsigned char*)s,strlen(s),tmp);
	char tmphex[SHA_DIGEST_LENGTH*2+1];
	for (int i=0; i<SHA_DIGEST_LENGTH; i++){
		unsigned byte = tmp[i];
		tmphex[i*2] = misc_tohex(byte>>4);
		tmphex[i*2+1] = misc_tohex(byte&0xf);
	}
	tmphex[2*SHA_DIGEST_LENGTH] = '\0';
	res.setfrom (tmphex);
}