// -*- mode: c; tab-width: 8; indent-tabs-mode: 1; st-rulers: [70] -*-
// vim: ts=8 sw=8 ft=c noet

#include "libsodium_api_crypto_pwhash.h"

static void	LS_API_EXEC(crypto_pwhash, alg_argon2i13);
static void	LS_API_EXEC(crypto_pwhash, alg_default);
static void	LS_API_EXEC(crypto_pwhash, saltbytes);
static void	LS_API_EXEC(crypto_pwhash, strbytes);
static void	LS_API_EXEC(crypto_pwhash, strprefix);
static void	LS_API_EXEC(crypto_pwhash, opslimit_interactive);
static void	LS_API_EXEC(crypto_pwhash, memlimit_interactive);
static void	LS_API_EXEC(crypto_pwhash, opslimit_moderate);
static void	LS_API_EXEC(crypto_pwhash, memlimit_moderate);
static void	LS_API_EXEC(crypto_pwhash, opslimit_sensitive);
static void	LS_API_EXEC(crypto_pwhash, memlimit_sensitive);
static int	LS_API_INIT(crypto_pwhash, crypto_pwhash);
static void	LS_API_EXEC(crypto_pwhash, crypto_pwhash);
static int	LS_API_INIT(crypto_pwhash, str);
static void	LS_API_EXEC(crypto_pwhash, str);
static int	LS_API_INIT(crypto_pwhash, str_verify);
static void	LS_API_EXEC(crypto_pwhash, str_verify);
static void	LS_API_EXEC(crypto_pwhash, primitive);

libsodium_function_t	libsodium_functions_crypto_pwhash[] = {
	LS_API_R_ARG0(crypto_pwhash, alg_argon2i13),
	LS_API_R_ARG0(crypto_pwhash, alg_default),
	LS_API_R_ARG0(crypto_pwhash, saltbytes),
	LS_API_R_ARG0(crypto_pwhash, strbytes),
	LS_API_R_ARG0(crypto_pwhash, strprefix),
	LS_API_R_ARG0(crypto_pwhash, opslimit_interactive),
	LS_API_R_ARG0(crypto_pwhash, memlimit_interactive),
	LS_API_R_ARG0(crypto_pwhash, opslimit_moderate),
	LS_API_R_ARG0(crypto_pwhash, memlimit_moderate),
	LS_API_R_ARG0(crypto_pwhash, opslimit_sensitive),
	LS_API_R_ARG0(crypto_pwhash, memlimit_sensitive),
	LS_API_R_ARGV(crypto_pwhash, crypto_pwhash, 6),
	LS_API_R_ARGV(crypto_pwhash, str, 3),
	LS_API_R_ARGV(crypto_pwhash, str_verify, 2),
	LS_API_R_ARG0(crypto_pwhash, primitive),
	{NULL}
};

/* crypto_pwhash_alg_argon2i13/0 */

LS_API_GET_SINT(crypto_pwhash, alg_argon2i13);

/* crypto_pwhash_alg_default/0 */

LS_API_GET_SINT(crypto_pwhash, alg_default);

/* crypto_pwhash_saltbytes/0 */

LS_API_GET_SIZE(crypto_pwhash, saltbytes);

/* crypto_pwhash_strbytes/0 */

LS_API_GET_SIZE(crypto_pwhash, strbytes);

/* crypto_pwhash_strprefix/0 */

LS_API_GET_STR(crypto_pwhash, strprefix);

/* crypto_pwhash_opslimit_interactive/0 */

LS_API_GET_SIZE(crypto_pwhash, opslimit_interactive);

/* crypto_pwhash_memlimit_interactive/0 */

LS_API_GET_SIZE(crypto_pwhash, memlimit_interactive);

/* crypto_pwhash_opslimit_moderate/0 */

LS_API_GET_SIZE(crypto_pwhash, opslimit_moderate);

/* crypto_pwhash_memlimit_moderate/0 */

LS_API_GET_SIZE(crypto_pwhash, memlimit_moderate);

/* crypto_pwhash_opslimit_sensitive/0 */

LS_API_GET_SIZE(crypto_pwhash, opslimit_sensitive);

/* crypto_pwhash_memlimit_sensitive/0 */

LS_API_GET_SIZE(crypto_pwhash, memlimit_sensitive);

/* crypto_pwhash_crypto_pwhash/6 */

typedef struct LS_API_F_ARGV(crypto_pwhash, crypto_pwhash) {
	unsigned long long	outlen;
	const char *		passwd;
	unsigned long long	passwdlen;
	const unsigned char *	salt;
	size_t			saltlen;
	unsigned long long	opslimit;
	size_t			memlimit;
	int			alg;
} LS_API_F_ARGV_T(crypto_pwhash, crypto_pwhash);

static int
LS_API_INIT(crypto_pwhash, crypto_pwhash)
{
	LS_API_F_ARGV_T(crypto_pwhash, crypto_pwhash) *argv;
	int skip;
	int type;
	int type_length;
	unsigned long long outlen;
	unsigned long long passwdlen;
	size_t saltbytes;
	size_t saltlen;
	unsigned long long opslimit;
	size_t memlimit;
	long alg;
	ErlDrvSizeT x;
	void *p;

	if (ei_decode_ulong(buffer, index, (unsigned long *)&(outlen)) < 0) {
		return -1;
	}

	if (ei_get_type(buffer, index, &type, &type_length) < 0
			|| type != ERL_BINARY_EXT) {
		return -1;
	}

	passwdlen = (unsigned long long)(type_length);

	skip = *index;

	if (ei_skip_term(buffer, &skip) < 0) {
		return -1;
	}

	saltbytes = crypto_pwhash_saltbytes();

	if (ei_get_type(buffer, &skip, &type, &type_length) < 0
			|| type != ERL_BINARY_EXT
			|| type_length < saltbytes) {
		return -1;
	}

	saltlen = (size_t)(type_length);

	if (ei_skip_term(buffer, &skip) < 0) {
		return -1;
	}

	if (ei_decode_ulong(buffer, &skip, (unsigned long *)&(opslimit)) < 0) {
		return -1;
	}

	if (ei_decode_ulong(buffer, &skip, (unsigned long *)&(memlimit)) < 0) {
		return -1;
	}

	if (ei_decode_long(buffer, &skip, (long *)&(alg)) < 0) {
		return -1;
	}

	x = (ErlDrvSizeT)(passwdlen + saltlen + (sizeof (LS_API_F_ARGV_T(crypto_pwhash, crypto_pwhash))));
	p = (void *)(driver_alloc(x));

	if (p == NULL) {
		return -1;
	}

	argv = (LS_API_F_ARGV_T(crypto_pwhash, crypto_pwhash) *)(p);
	argv->outlen = outlen;
	argv->opslimit = opslimit;
	argv->memlimit = memlimit;
	argv->alg = (int)alg;
	p += (sizeof (LS_API_F_ARGV_T(crypto_pwhash, crypto_pwhash)));
	argv->passwd = (const char *)(p);
	p += passwdlen;
	argv->salt = (const unsigned char *)(p);
	argv->saltlen = saltlen;

	if (ei_decode_binary(buffer, index, (void *)(argv->passwd), (long *)&(argv->passwdlen)) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	if (ei_decode_binary(buffer, index, (void *)(argv->salt), (long *)&(argv->saltlen)) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	if (ei_skip_term(buffer, index) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	if (ei_skip_term(buffer, index) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	if (ei_skip_term(buffer, index) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	request->argv = (void *)(argv);

	return 0;
}

static void
LS_API_EXEC(crypto_pwhash, crypto_pwhash)
{
	LS_API_F_ARGV_T(crypto_pwhash, crypto_pwhash) *argv;
	LS_API_READ_ARGV(crypto_pwhash, crypto_pwhash);

	unsigned char out[argv->outlen];

	LS_SAFE_REPLY(crypto_pwhash(out, argv->outlen, argv->passwd, argv->passwdlen, argv->salt, argv->opslimit, argv->memlimit, argv->alg), LS_PROTECT({
		LS_RES_TAG(request),
		ERL_DRV_BUF2BINARY, (ErlDrvTermData)(out), argv->outlen,
		ERL_DRV_TUPLE, 2
	}), __FILE__, __LINE__);

	(void) sodium_memzero(out, argv->outlen);
}

/* crypto_pwhash_str/3 */

typedef struct LS_API_F_ARGV(crypto_pwhash, str) {
	const char *		passwd;
	unsigned long long	passwdlen;
	unsigned long long	opslimit;
	size_t			memlimit;
} LS_API_F_ARGV_T(crypto_pwhash, str);

static int
LS_API_INIT(crypto_pwhash, str)
{
	LS_API_F_ARGV_T(crypto_pwhash, str) *argv;
	int skip;
	int type;
	int type_length;
	unsigned long long passwdlen;
	unsigned long long opslimit;
	size_t memlimit;
	ErlDrvSizeT x;
	void *p;

	if (ei_get_type(buffer, index, &type, &type_length) < 0
			|| type != ERL_BINARY_EXT) {
		return -1;
	}

	passwdlen = (unsigned long long)(type_length);

	skip = *index;

	if (ei_skip_term(buffer, &skip) < 0) {
		return -1;
	}

	if (ei_decode_ulong(buffer, &skip, (unsigned long *)&(opslimit)) < 0) {
		return -1;
	}

	if (ei_decode_ulong(buffer, &skip, (unsigned long *)&(memlimit)) < 0) {
		return -1;
	}

	x = (ErlDrvSizeT)(passwdlen + (sizeof (LS_API_F_ARGV_T(crypto_pwhash, str))));
	p = (void *)(driver_alloc(x));

	if (p == NULL) {
		return -1;
	}

	argv = (LS_API_F_ARGV_T(crypto_pwhash, str) *)(p);
	argv->opslimit = opslimit;
	argv->memlimit = memlimit;
	p += (sizeof (LS_API_F_ARGV_T(crypto_pwhash, str)));
	argv->passwd = (const char *)(p);

	if (ei_decode_binary(buffer, index, (void *)(argv->passwd), (long *)&(argv->passwdlen)) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	if (ei_skip_term(buffer, index) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	if (ei_skip_term(buffer, index) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	request->argv = (void *)(argv);

	return 0;
}

static void
LS_API_EXEC(crypto_pwhash, str)
{
	LS_API_F_ARGV_T(crypto_pwhash, str) *argv;
	LS_API_READ_ARGV(crypto_pwhash, str);

	char out[crypto_pwhash_STRBYTES];

	LS_SAFE_REPLY(crypto_pwhash_str(out, argv->passwd, argv->passwdlen, argv->opslimit, argv->memlimit), LS_PROTECT({
		LS_RES_TAG(request),
		ERL_DRV_BUF2BINARY, (ErlDrvTermData)(out), strlen(out),
		ERL_DRV_TUPLE, 2
	}), __FILE__, __LINE__);

	(void) sodium_memzero(out, sizeof(out));
}

/* crypto_pwhash_str_verify/2 */

typedef struct LS_API_F_ARGV(crypto_pwhash, str_verify) {
	const char		str[crypto_pwhash_STRBYTES];
	const char *		passwd;
	unsigned long long	passwdlen;
} LS_API_F_ARGV_T(crypto_pwhash, str_verify);

static int
LS_API_INIT(crypto_pwhash, str_verify)
{
	LS_API_F_ARGV_T(crypto_pwhash, str_verify) *argv;
	int skip;
	int type;
	int type_length;
	unsigned long long passwdlen;
	ErlDrvSizeT x;
	void *p;

	if (ei_get_type(buffer, index, &type, &type_length) < 0
			|| type != ERL_BINARY_EXT
			|| type_length > crypto_pwhash_STRBYTES) {
		return -1;
	}

	skip = *index;

	if (ei_skip_term(buffer, &skip) < 0) {
		return -1;
	}

	if (ei_get_type(buffer, &skip, &type, &type_length) < 0
			|| type != ERL_BINARY_EXT) {
		return -1;
	}

	passwdlen = (unsigned long long)(type_length);

	x = (ErlDrvSizeT)(passwdlen + (sizeof (LS_API_F_ARGV_T(crypto_pwhash, str_verify))));
	p = (void *)(driver_alloc(x));
	(void) sodium_memzero(p, x);

	if (p == NULL) {
		return -1;
	}

	argv = (LS_API_F_ARGV_T(crypto_pwhash, str_verify) *)(p);
	p += (sizeof (LS_API_F_ARGV_T(crypto_pwhash, str_verify)));
	argv->passwd = (const char *)(p);

	if (ei_decode_binary(buffer, index, (void *)(argv->str), NULL) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	if (ei_decode_binary(buffer, index, (void *)(argv->passwd), (long *)&(argv->passwdlen)) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	request->argv = (void *)(argv);

	return 0;
}

static void
LS_API_EXEC(crypto_pwhash, str_verify)
{
	LS_API_F_ARGV_T(crypto_pwhash, str_verify) *argv;
	LS_API_READ_ARGV(crypto_pwhash, str_verify);

	int r = crypto_pwhash_str_verify(argv->str, argv->passwd, argv->passwdlen);

	ErlDrvTermData spec[] = {
		LS_RES_TAG(request),
		ERL_DRV_INT, (ErlDrvSInt)(r),
		ERL_DRV_TUPLE, 2
	};

	LS_RESPOND(request, spec, __FILE__, __LINE__);
}

/* crypto_pwhash_primitive/0 */

LS_API_GET_STR(crypto_pwhash, primitive);