/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifdef SUPPORT_BLAKE512


LIBHASHSUM_1_NONNULL_
static size_t
process(struct libhashsum_hasher *this, const void *data, size_t bytes)
{
	return libblake_blake512_update(&this->state.blake512.s, data, bytes);
}


LIBHASHSUM_1_NONNULL_
static int
finalise_const(struct libhashsum_hasher *this, const void *data, size_t bytes, unsigned extra_bits)
{
	const uint8_t *m = data;
	size_t r;

	if (extra_bits > 7U) {
		errno = EINVAL;
		return -1;
	}

	r = libblake_blake512_update(&this->state.blake512.s, data, bytes);
	m = &m[r];
	bytes -= r;

	memcpy(this->state.blake512.buf, m, bytes + (size_t)(extra_bits > 0U));
	if (extra_bits)
		this->state.blake512.buf[bytes] = libhashsum_reverse_byte__(this->state.blake512.buf[bytes]);
	libblake_blake512_digest(&this->state.blake512.s, this->state.blake512.buf, bytes,
	                         extra_bits, NULL, this->state.blake512.buf);
	memset(&this->state.blake512.s, 0, sizeof(this->state.blake512.s));
	this->hash_output = this->state.blake512.buf;
	return 0;
}


LIBHASHSUM_1_NONNULL_
static int
finalise(struct libhashsum_hasher *this, void *data, size_t bytes, unsigned extra_bits, size_t size)
{
	uint8_t *m = data;
	size_t r;

	if (extra_bits > 7U) {
		errno = EINVAL;
		return -1;
	}

	r = libblake_blake512_update(&this->state.blake512.s, data, bytes);
	m = &m[r];
	bytes -= r;
	size -= r;

	if (size < libblake_blake512_digest_get_required_input_size(bytes, extra_bits, NULL)) {
		memcpy(this->state.blake512.buf, m, bytes + (size_t)(extra_bits > 0U));
		m = this->state.blake512.buf;
	}
	if (extra_bits)
		m[bytes] = libhashsum_reverse_byte__(m[bytes]);
	libblake_blake512_digest(&this->state.blake512.s, m, bytes, extra_bits, NULL, this->state.blake512.buf);
	memset(&this->state.blake512.s, 0, sizeof(this->state.blake512.s));
	this->hash_output = this->state.blake512.buf;
	return 0;
}


int
libhashsum_init_blake512_hasher(struct libhashsum_hasher *this)
{
	libblake_init();
	this->algorithm = LIBHASHSUM_BLAKE512;
	this->algorithm_string = "BLAKE512";
	this->input_block_size = 128U;
	this->hash_size = LIBHASHSUM_BLAKE512_HASH_SIZE;
	this->hash_output = NULL;
	this->supports_non_whole_bytes = 1;
	this->process = &process;
	this->finalise_const = &finalise_const;
	this->finalise = &finalise;
	this->destroy = NULL;
	libblake_blake512_init2(&this->state.blake512.s, NULL);
	return 0;
}


#else
int
libhashsum_init_blake512_hasher(struct libhashsum_hasher *this)
{
	(void) this;
	errno = ENOSYS;
	return -1;
}
#endif