#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "argon2src/argon2.h"

//extern "C" __attribute__((visibility("default"))) __attribute__((used))
int32_t native_add(int32_t x, int32_t y) {
    return x + y;
}
//EOF

#define HASHLEN 32
#define SALTLEN 16
#define PWD "password"


// base64 encoding https://nachtimwald.com/2017/11/18/base64-encode-and-decode-in-c/

size_t b64_encoded_size(size_t inlen)
{
	size_t ret;

	ret = inlen;
	if (inlen % 3 != 0)
		ret += 3 - (inlen % 3);
	ret /= 3;
	ret *= 4;

	return ret;
}

const char b64chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

char *b64_encode(const unsigned char *in, size_t len)
{
	char   *out;
	size_t  elen;
	size_t  i;
	size_t  j;
	size_t  v;

	if (in == NULL || len == 0)
		return NULL;

	elen = b64_encoded_size(len);
	out  = malloc(elen+1);
	out[elen] = '\0';

	for (i=0, j=0; i<len; i+=3, j+=4) {
		v = in[i];
		v = i+1 < len ? v << 8 | in[i+1] : v << 8;
		v = i+2 < len ? v << 8 | in[i+2] : v << 8;

		out[j]   = b64chars[(v >> 18) & 0x3F];
		out[j+1] = b64chars[(v >> 12) & 0x3F];
		if (i+1 < len) {
			out[j+2] = b64chars[(v >> 6) & 0x3F];
		} else {
			out[j+2] = '=';
		}
		if (i+2 < len) {
			out[j+3] = b64chars[v & 0x3F];
		} else {
			out[j+3] = '=';
		}
	}

	return out;
}


char* hashStuff(char* hashPwd) {
    uint8_t hash1[HASHLEN];
    uint8_t salt[SALTLEN];
    memset( salt, 0x00, SALTLEN );

    uint8_t *pwd = (uint8_t *)strdup(PWD);
    uint32_t pwdlen = strlen((char *)pwd);

    uint32_t t_cost = 2;            // 1-pass computation
    uint32_t m_cost = (1<<16);      // 64 mebibytes memory usage
    uint32_t parallelism = 1;       // number of threads and lanes
    argon2i_hash_raw(t_cost, m_cost, parallelism, pwd, pwdlen, salt, SALTLEN, hash1, HASHLEN);
    char *b64ret = b64_encode(hash1, HASHLEN);
    return b64ret;
}