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

#include "libsodium_api_crypto_auth.h"

static void	LS_API_EXEC(crypto_auth, bytes);
static void	LS_API_EXEC(crypto_auth, keybytes);
static void	LS_API_EXEC(crypto_auth, primitive);
static int	LS_API_INIT(crypto_auth, crypto_auth);
static void	LS_API_EXEC(crypto_auth, crypto_auth);
static int	LS_API_INIT(crypto_auth, verify);
static void	LS_API_EXEC(crypto_auth, verify);

libsodium_function_t	libsodium_functions_crypto_auth[] = {
	LS_API_R_ARG0(crypto_auth, bytes),
	LS_API_R_ARG0(crypto_auth, keybytes),
	LS_API_R_ARG0(crypto_auth, primitive),
	LS_API_R_ARGV(crypto_auth, crypto_auth, 2),
	LS_API_R_ARGV(crypto_auth, verify, 3),
	{NULL}
};

/* crypto_auth_bytes/0 */

static void
LS_API_EXEC(crypto_auth, bytes)
{
	size_t bytes;

	bytes = crypto_auth_bytes();

	ErlDrvTermData spec[] = {
		LS_RES_TAG(request),
		ERL_DRV_UINT, (ErlDrvUInt)(bytes),
		ERL_DRV_TUPLE, 2
	};

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

/* crypto_auth_keybytes/0 */

static void
LS_API_EXEC(crypto_auth, keybytes)
{
	size_t keybytes;

	keybytes = crypto_auth_keybytes();

	ErlDrvTermData spec[] = {
		LS_RES_TAG(request),
		ERL_DRV_UINT, (ErlDrvUInt)(keybytes),
		ERL_DRV_TUPLE, 2
	};

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

/* crypto_auth_primitive/0 */

static void
LS_API_EXEC(crypto_auth, primitive)
{
	const char *primitive;

	primitive = crypto_auth_primitive();

	ErlDrvTermData spec[] = {
		LS_RES_TAG(request),
		ERL_DRV_ATOM, driver_mk_atom((char *)(primitive)),
		ERL_DRV_TUPLE, 2
	};

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

/* crypto_auth_crypto_auth/2 */

typedef struct LS_API_F_ARGV(crypto_auth, crypto_auth) {
	const unsigned char	*in;
	unsigned long long	inlen;
	const unsigned char	*k;
} LS_API_F_ARGV_T(crypto_auth, crypto_auth);

static int
LS_API_INIT(crypto_auth, crypto_auth)
{
	LS_API_F_ARGV_T(crypto_auth, crypto_auth) *argv;
	int skip;
	int type;
	int type_length;
	unsigned long long inlen;
	size_t keybytes;
	ErlDrvSizeT x;
	void *p;

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

	inlen = (unsigned long long)(type_length);

	skip = *index;

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

	keybytes = crypto_auth_keybytes();

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

	x = (ErlDrvSizeT)(inlen + keybytes + (sizeof (LS_API_F_ARGV_T(crypto_auth, crypto_auth))));
	p = (void *)(driver_alloc(x));

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

	argv = (LS_API_F_ARGV_T(crypto_auth, crypto_auth) *)(p);
	p += (sizeof (LS_API_F_ARGV_T(crypto_auth, crypto_auth)));
	argv->in = (const unsigned char *)(p);
	p += inlen;
	argv->k = (const unsigned char *)(p);

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

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

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

	return 0;
}

static void
LS_API_EXEC(crypto_auth, crypto_auth)
{
	LS_API_F_ARGV_T(crypto_auth, crypto_auth) *argv;
	LS_API_READ_ARGV(crypto_auth, crypto_auth);
	size_t bytes;
	unsigned char *out;

	bytes = crypto_auth_bytes();
	out = (unsigned char *)(driver_alloc((ErlDrvSizeT)(bytes)));

	if (out == NULL) {
		LS_FAIL_OOM(request->port->drv_port);
		return;
	}

	(void) crypto_auth(out, argv->in, argv->inlen, argv->k);

	ErlDrvTermData spec[] = {
		LS_RES_TAG(request),
		ERL_DRV_BUF2BINARY, (ErlDrvTermData)(out), bytes,
		ERL_DRV_TUPLE, 2
	};

	LS_RESPOND(request, spec, __FILE__, __LINE__);

	(void) driver_free(out);
}

/* crypto_auth_verify/3 */

typedef struct LS_API_F_ARGV(crypto_auth, verify) {
	const unsigned char		*h;
	const unsigned char		*in;
	unsigned long long		inlen;
	const unsigned char		*k;
} LS_API_F_ARGV_T(crypto_auth, verify);

static int
LS_API_INIT(crypto_auth, verify)
{
	LS_API_F_ARGV_T(crypto_auth, verify) *argv;
	int skip;
	int type;
	int type_length;
	size_t bytes;
	size_t inlen;
	size_t keybytes;
	ErlDrvSizeT x;
	void *p;

	bytes = crypto_auth_bytes();
	keybytes = crypto_auth_keybytes();

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

	inlen = (size_t)(type_length);

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

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

	x = (ErlDrvSizeT)(bytes + inlen + keybytes + (sizeof (LS_API_F_ARGV_T(crypto_auth, verify))));
	p = (void *)(driver_alloc(x));

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

	argv = (LS_API_F_ARGV_T(crypto_auth, verify) *)(p);
	p += (sizeof (LS_API_F_ARGV_T(crypto_auth, verify)));
	argv->h = (const unsigned char *)(p);
	p += bytes;
	argv->in = (const unsigned char *)(p);
	p += inlen;
	argv->k = (const unsigned char *)(p);

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

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

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

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

	return 0;
}

static void
LS_API_EXEC(crypto_auth, verify)
{
	LS_API_F_ARGV_T(crypto_auth, verify) *argv;
	LS_API_READ_ARGV(crypto_auth, verify);
	int r;

	r = crypto_auth_verify(argv->h, argv->in, argv->inlen, argv->k);

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

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