Libsodium Argon2 parallelism

argon2id.c

/*
 * cc argon2id.c -lsodium -o argon2id
 *
 * printf "password" | argon2id -s salt -m mem -t time -p thread > file.key
 */

#include <string.h>
#include <unistd.h>

#include <sodium.h>

/*
 * Copy me if you can.
 * by 20h
 */
#define ARGBEGIN        for (argv0 = *argv, argv++, argc--; argv[0] && argv[0][0] == '-' && argv[0][1];argc--,argv++) {\
                                char argc_, **argv_; int brk_;\
                                if (argv[0][1] == '-' && argv[0][2] == '\0') {\
                                        argv++; argc--; break;\
                                }\
                                for (int i_=1, brk_=0, argv_ = argv; argv[0][i_] && !brk_; i_++) {\
                                        if (argv_ != argv) break;\
                                        argc_ = argv[0][i_];\
                                        switch (argc_)
#define ARGEND                  }}
#define EARGF(x)        ((argv[0][i_+1] == '\0' && argv[1] == NULL)?\
                                ((x), abort(), (char *)0) :\
                                (brk_ = 1, (argv[0][i_+1] != '\0')?\
                                        (&argv[0][i_+1]) :\
                                        (argc--, argv++, argv[0])))

void
usage(char *pgm)
{
	fprintf(stderr, "usage: %s -s salt -m mem -t time -p parallelism > file.key\n", pgm);
	exit(1);
}

int
main(int argc, char *argv[])
{
	int fd, memory, time, parallelism;
	uint8_t key[32];
	char *argv0, *salt, pw[256];
	ssize_t n;

	/* default key derivation values */
	memory      = 65536;
	time        = 3;
	parallelism = 1;

	ARGBEGIN {
	case 'm':
		memory = atoi(EARGF(usage(argv0)));
		break;
	case 't':
		time = atoi(EARGF(usage(argv0)));
		break;
	case 'p':
		parallelism = atoi(EARGF(usage(argv0)));
		break;
	case 's':
		salt = EARGF(usage(argv0));
		break;
	default:
		usage(argv0);
	} ARGEND

	if (sodium_init() < 0)
		return -1;

	n = fread(pw, 1, sizeof(pw), stdin);

	/*
	 * note: parallelism not used as it's hardcoded in libsodium.
	 * See https://github.com/jedisct1/libsodium/discussions/1092
	 */
	if (crypto_pwhash_argon2id(key, 32, pw, n, salt, time, memory*1024, crypto_pwhash_ALG_ARGON2ID13))
		return -1;

	write(1, key, sizeof(key));

	return 0;
}

argon2id.go

/*
 * usage
 */

package main

import (
	"flag"
	"os"
	"bufio"

	"golang.org/x/crypto/argon2"
)

const (
	// libsodium defaults values
	argon2id_memory_cost      = 65536 // 64 Kib
	argon2id_time_cost        = 3
	argon2id_threads          = 1
)

func main() {
	var salt string
        var time, memory, threads uint64

	flag.StringVar(&salt, "s", "0123456789abcdef", "Salt")
	flag.Uint64Var(&memory, "m", argon2id_memory_cost, "Memory cost")
	flag.Uint64Var(&time, "t", argon2id_time_cost, "Time cost")
	flag.Uint64Var(&threads, "p", argon2id_threads, "Parallel threads")

	flag.Parse()

	pw, _ := bufio.NewReader(os.Stdin).ReadString('\n')
	key := argon2.IDKey([]byte(pw), []byte(salt[:16]), uint32(time), uint32(memory), uint8(threads), 32)
	os.Stdout.Write(key)
}

benchmark.sh

#!/bin/sh

pass="libsodium"
salt="0123456789abcdef"
time=3
mem=65536

thread=1
printf 'm=%d,t=%d,p=%d\n' $mem $time $thread
[ -x argon2          ] && printf 'phc    :' && printf "%s" $pass | ./argon2 $salt -id -k $mem -t $time -p $thread -r
[ -x argon2id_go     ] && printf 'go     :' && printf "%s" $pass | ./argon2id_go -s $salt -m $mem -t $time -p $thread | xxd -c 32 -p
[ -x argon2id_sodium ] && printf 'sodium :' && printf "%s" $pass | ./argon2id_sodium -s $salt -m $mem -t $time -p $thread | xxd -c 32 -p

echo

thread=4
printf 'm=%d,t=%d,p=%d\n' $mem $time $thread
[ -x argon2          ] && printf 'phc    :' && printf "%s" $pass | ./argon2 $salt -id -k $mem -t $time -p $thread -r
[ -x argon2id_go     ] && printf 'go     :' && printf "%s" $pass | ./argon2id_go -s $salt -m $mem -t $time -p $thread | xxd -c 32 -p
[ -x argon2id_sodium ] && printf 'sodium :' && printf "%s" $pass | ./argon2id_sodium -s $salt -m $mem -t $time -p $thread | xxd -c 32 -p

benchmark.txt

m=65536,t=3,p=1
phc    :bac8c2da3ea370cd916560750fa83b3b50b2d5b42fe0ba1017c6e517066ee715
go     :bac8c2da3ea370cd916560750fa83b3b50b2d5b42fe0ba1017c6e517066ee715
sodium :bac8c2da3ea370cd916560750fa83b3b50b2d5b42fe0ba1017c6e517066ee715

m=65536,t=3,p=4
phc    :57bf8befb740f474ef6c7cff20b3c84b7e7e8075a4c15499f90f50893bb5dd02
go     :57bf8befb740f474ef6c7cff20b3c84b7e7e8075a4c15499f90f50893bb5dd02
sodium :bac8c2da3ea370cd916560750fa83b3b50b2d5b42fe0ba1017c6e517066ee715