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

#define A 10
#define B 11
#define C 12
#define D 13
#define E 14
#define F 15

void
libblake_blake2b_init(struct libblake_blake2b_state *state, const struct libblake_blake2b_params *params, const unsigned char *key)
{
	state->h[0] = UINT_LEAST64_C(0x6A09E667F3BCC908);
	state->h[1] = UINT_LEAST64_C(0xBB67AE8584CAA73B);
	state->h[2] = UINT_LEAST64_C(0x3C6EF372FE94F82B);
	state->h[3] = UINT_LEAST64_C(0xA54FF53A5F1D36F1);
	state->h[4] = UINT_LEAST64_C(0x510E527FADE682D1);
	state->h[5] = UINT_LEAST64_C(0x9B05688C2B3E6C1F);
	state->h[6] = UINT_LEAST64_C(0x1F83D9ABFB41BD6B);
	state->h[7] = UINT_LEAST64_C(0x5BE0CD19137E2179);

	state->t[0] = 0;
	state->t[1] = 0;
	state->f[0] = 0;
	state->f[1] = 0;

	state->h[0] ^= ((uint_least64_t)params->digest_len & 255) << 0;
	state->h[0] ^= ((uint_least64_t)params->key_len & 255) << 8;
	state->h[0] ^= ((uint_least64_t)params->fanout & 255) << 16;
	state->h[0] ^= ((uint_least64_t)params->depth & 255) << 24;
	state->h[0] ^= ((uint_least64_t)(params->leaf_len >> 0) & 255) << 32;
	state->h[0] ^= ((uint_least64_t)(params->leaf_len >> 8) & 255) << 40;
	state->h[0] ^= ((uint_least64_t)(params->leaf_len >> 16) & 255) << 48;
	state->h[0] ^= ((uint_least64_t)(params->leaf_len >> 24) & 255) << 56;
	state->h[1] ^= ((uint_least64_t)(params->node_offset >> 0) & 255) << 0;
	state->h[1] ^= ((uint_least64_t)(params->node_offset >> 8) & 255) << 8;
	state->h[1] ^= ((uint_least64_t)(params->node_offset >> 16) & 255) << 16;
	state->h[1] ^= ((uint_least64_t)(params->node_offset >> 24) & 255) << 24;
	state->h[1] ^= ((uint_least64_t)(params->xof_len >> 0) & 255) << 32;
	state->h[1] ^= ((uint_least64_t)(params->xof_len >> 8) & 255) << 40;
	state->h[1] ^= ((uint_least64_t)(params->xof_len >> 16) & 255) << 48;
	state->h[1] ^= ((uint_least64_t)(params->xof_len >> 24) & 255) << 56;
	state->h[2] ^= ((uint_least64_t)params->node_depth & 255) << 0;
	state->h[2] ^= ((uint_least64_t)params->inner_len & 255) << 8;
	state->h[4] ^= ((uint_least64_t)params->salt[0] & 255) << 0;
	state->h[4] ^= ((uint_least64_t)params->salt[1] & 255) << 8;
	state->h[4] ^= ((uint_least64_t)params->salt[2] & 255) << 16;
	state->h[4] ^= ((uint_least64_t)params->salt[3] & 255) << 24;
	state->h[4] ^= ((uint_least64_t)params->salt[4] & 255) << 32;
	state->h[4] ^= ((uint_least64_t)params->salt[5] & 255) << 40;
	state->h[4] ^= ((uint_least64_t)params->salt[6] & 255) << 48;
	state->h[4] ^= ((uint_least64_t)params->salt[7] & 255) << 56;
	state->h[5] ^= ((uint_least64_t)params->salt[8] & 255) << 0;
	state->h[5] ^= ((uint_least64_t)params->salt[9] & 255) << 8;
	state->h[5] ^= ((uint_least64_t)params->salt[A] & 255) << 16;
	state->h[5] ^= ((uint_least64_t)params->salt[B] & 255) << 24;
	state->h[5] ^= ((uint_least64_t)params->salt[C] & 255) << 32;
	state->h[5] ^= ((uint_least64_t)params->salt[D] & 255) << 40;
	state->h[5] ^= ((uint_least64_t)params->salt[E] & 255) << 48;
	state->h[5] ^= ((uint_least64_t)params->salt[F] & 255) << 56;
	state->h[6] ^= ((uint_least64_t)params->pepper[0] & 255) << 0;
	state->h[6] ^= ((uint_least64_t)params->pepper[1] & 255) << 8;
	state->h[6] ^= ((uint_least64_t)params->pepper[2] & 255) << 16;
	state->h[6] ^= ((uint_least64_t)params->pepper[3] & 255) << 24;
	state->h[6] ^= ((uint_least64_t)params->pepper[4] & 255) << 32;
	state->h[6] ^= ((uint_least64_t)params->pepper[5] & 255) << 40;
	state->h[6] ^= ((uint_least64_t)params->pepper[6] & 255) << 48;
	state->h[6] ^= ((uint_least64_t)params->pepper[7] & 255) << 56;
	state->h[7] ^= ((uint_least64_t)params->pepper[8] & 255) << 0;
	state->h[7] ^= ((uint_least64_t)params->pepper[9] & 255) << 8;
	state->h[7] ^= ((uint_least64_t)params->pepper[A] & 255) << 16;
	state->h[7] ^= ((uint_least64_t)params->pepper[B] & 255) << 24;
	state->h[7] ^= ((uint_least64_t)params->pepper[C] & 255) << 32;
	state->h[7] ^= ((uint_least64_t)params->pepper[D] & 255) << 40;
	state->h[7] ^= ((uint_least64_t)params->pepper[E] & 255) << 48;
	state->h[7] ^= ((uint_least64_t)params->pepper[F] & 255) << 56;

	if (params->key_len) {
		state->t[0] = 128;
		libblake_internal_blake2b_compress(state, key);
	}
}