Differential D33373 Diff 99939 sys/crypto/sha2/sha512c_arm64.c

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sys/crypto/sha2/sha512c_arm64.c

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				/*-
				* Copyright (c) 2021 The FreeBSD Foundation
				*
				* This software was developed by Andrew Turner under sponsorship from
				* the FreeBSD Foundation.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/types.h>

				#include <arm_neon.h>

				#include "sha512.h"
				#include "sha512c_impl.h"

				void __hidden
				SHA512_Transform_arm64_impl(uint64_t * state,
				const unsigned char block[SHA512_BLOCK_LENGTH], const uint64_t K[80])
				{
				uint64x2_t W[8];
				uint64x2_t S[4];
				uint64x2_t S_start[4];
				uint64x2_t K_tmp, S_tmp;
				int i;

				#define A64_LOAD_W(x) \
				W[x] = vld1q_u64((const uint64_t )(&block[(x) 16])); \
				W[x] = vreinterpretq_u64_u8(vrev64q_u8(vreinterpretq_u8_u64(W[x])))

				/* 1. Prepare the first part of the message schedule W. */
				A64_LOAD_W(0);
				A64_LOAD_W(1);
				A64_LOAD_W(2);
				A64_LOAD_W(3);
				A64_LOAD_W(4);
				A64_LOAD_W(5);
				A64_LOAD_W(6);
				A64_LOAD_W(7);

				/* 2. Initialize working variables. */
				S[0] = vld1q_u64(&state[0]);
				S[1] = vld1q_u64(&state[2]);
				S[2] = vld1q_u64(&state[4]);
				S[3] = vld1q_u64(&state[6]);

				S_start[0] = S[0];
				S_start[1] = S[1];
				S_start[2] = S[2];
				S_start[3] = S[3];

				/* 3. Mix. */
				for (i = 0; i < 80; i += 16) {
				/*
				* The schedule array has 4 vectors:
				* ab = S[( 8 - i) % 4]
				* cd = S[( 9 - i) % 4]
				* ef = S[(10 - i) % 4]
				* gh = S[(11 - i) % 4]
				*
				* The following maacro:
				* - Loads the round constants
				* - Add them to schedule words
				* - Rotates the total to switch the order of the two halves
				* so they are in the correct order for gh
				* - Fix the alignment
				* - Extract fg from ef and gh
				* - Extract de from cd and ef
				* - Pass these into the first part of the sha512 calculation
				* to calculate the Sigma 1 and Ch steps
				* - Calculate the Sigma 0 and Maj steps and store to gh
				* - Add the first part to the cd vector
				*/
				#define A64_RNDr(S, W, i, ii) \
				K_tmp = vld1q_u64(K + (i * 2) + ii); \
				K_tmp = vaddq_u64(W[i], K_tmp); \
				K_tmp = vextq_u64(K_tmp, K_tmp, 1); \
				K_tmp = vaddq_u64(K_tmp, S[(11 - i) % 4]); \
				S_tmp = vsha512hq_u64(K_tmp, \
				vextq_u64(S[(10 - i) % 4], S[(11 - i) % 4], 1), \
				vextq_u64(S[(9 - i) % 4], S[(10 - i) % 4], 1)); \
				S[(11 - i) % 4] = vsha512h2q_u64(S_tmp, S[(9 - i) % 4], S[(8 - i) % 4]); \
				S[(9 - i) % 4] = vaddq_u64(S[(9 - i) % 4], S_tmp)

				A64_RNDr(S, W, 0, i);
				A64_RNDr(S, W, 1, i);
				A64_RNDr(S, W, 2, i);
				A64_RNDr(S, W, 3, i);
				A64_RNDr(S, W, 4, i);
				A64_RNDr(S, W, 5, i);
				A64_RNDr(S, W, 6, i);
				A64_RNDr(S, W, 7, i);

				if (i == 64)
				break;

				/*
				* Perform the Message schedule computation:
				* - vsha512su0q_u64 performs the sigma 0 half and add it to
				* the old value
				* - vextq_u64 fixes the alignment of the vectors
				* - vsha512su1q_u64 performs the sigma 1 half and adds it
				* and both the above all together
				*/
				#define A64_MSCH(x) \
				W[x] = vsha512su1q_u64( \
				vsha512su0q_u64(W[x], W[(x + 1) % 8]), \
				W[(x + 7) % 8], \
				vextq_u64(W[(x + 4) % 8], W[(x + 5) % 8], 1))

				A64_MSCH(0);
				A64_MSCH(1);
				A64_MSCH(2);
				A64_MSCH(3);
				A64_MSCH(4);
				A64_MSCH(5);
				A64_MSCH(6);
				A64_MSCH(7);
				}

				/* 4. Mix local working variables into global state */
				S[0] = vaddq_u64(S[0], S_start[0]);
				S[1] = vaddq_u64(S[1], S_start[1]);
				S[2] = vaddq_u64(S[2], S_start[2]);
				S[3] = vaddq_u64(S[3], S_start[3]);

				vst1q_u64(&state[0], S[0]);
				vst1q_u64(&state[2], S[1]);
				vst1q_u64(&state[4], S[2]);
				vst1q_u64(&state[6], S[3]);
				}