/* SPDX-License-Identifier: Apache-2.0 OR BSD-2-Clause */
//
// This file is dual-licensed, meaning that you can use it under your
// choice of either of the following two licenses:
//
// Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License 2.0 (the "License"). You can obtain
// a copy in the file LICENSE in the source distribution or at
// https://www.openssl.org/source/license.html
//
// or
//
// Copyright (c) 2023, Christoph Müllner <[email protected]>
// Copyright (c) 2023, Phoebe Chen <[email protected]>
// Copyright 2024 Google LLC
// All rights reserved.
//
// 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 COPYRIGHT HOLDERS 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 COPYRIGHT
// OWNER 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.
// The generated code of this file depends on the following RISC-V extensions:
// - RV64I
// - RISC-V Vector ('V') with VLEN >= 128
// - RISC-V Vector SHA-2 Secure Hash extension ('Zvknha' or 'Zvknhb')
// - RISC-V Vector Cryptography Bit-manipulation extension ('Zvkb')
#include <linux/cfi_types.h>
.text
.option arch, +zvknha, +zvkb
#define STATEP a0
#define DATA a1
#define NUM_BLOCKS a2
#define STATEP_C a3
#define MASK v0
#define INDICES v1
#define W0 v2
#define W1 v3
#define W2 v4
#define W3 v5
#define VTMP v6
#define FEBA v7
#define HGDC v8
#define K0 v10
#define K1 v11
#define K2 v12
#define K3 v13
#define K4 v14
#define K5 v15
#define K6 v16
#define K7 v17
#define K8 v18
#define K9 v19
#define K10 v20
#define K11 v21
#define K12 v22
#define K13 v23
#define K14 v24
#define K15 v25
#define PREV_FEBA v26
#define PREV_HGDC v27
// Do 4 rounds of SHA-256. w0 contains the current 4 message schedule words.
//
// If not all the message schedule words have been computed yet, then this also
// computes 4 more message schedule words. w1-w3 contain the next 3 groups of 4
// message schedule words; this macro computes the group after w3 and writes it
// to w0. This means that the next (w0, w1, w2, w3) is the current (w1, w2, w3,
// w0), so the caller must cycle through the registers accordingly.
.macro sha256_4rounds last, k, w0, w1, w2, w3
vadd.vv VTMP, \k, \w0
vsha2cl.vv HGDC, FEBA, VTMP
vsha2ch.vv FEBA, HGDC, VTMP
.if !\last
vmerge.vvm VTMP, \w2, \w1, MASK
vsha2ms.vv \w0, VTMP, \w3
.endif
.endm
.macro sha256_16rounds last, k0, k1, k2, k3
sha256_4rounds \last, \k0, W0, W1, W2, W3
sha256_4rounds \last, \k1, W1, W2, W3, W0
sha256_4rounds \last, \k2, W2, W3, W0, W1
sha256_4rounds \last, \k3, W3, W0, W1, W2
.endm
// void sha256_transform_zvknha_or_zvknhb_zvkb(u32 state[8], const u8 *data,
// int num_blocks);
SYM_TYPED_FUNC_START(sha256_transform_zvknha_or_zvknhb_zvkb)
// Load the round constants into K0-K15.
vsetivli zero, 4, e32, m1, ta, ma
la t0, K256
vle32.v K0, (t0)
addi t0, t0, 16
vle32.v K1, (t0)
addi t0, t0, 16
vle32.v K2, (t0)
addi t0, t0, 16
vle32.v K3, (t0)
addi t0, t0, 16
vle32.v K4, (t0)
addi t0, t0, 16
vle32.v K5, (t0)
addi t0, t0, 16
vle32.v K6, (t0)
addi t0, t0, 16
vle32.v K7, (t0)
addi t0, t0, 16
vle32.v K8, (t0)
addi t0, t0, 16
vle32.v K9, (t0)
addi t0, t0, 16
vle32.v K10, (t0)
addi t0, t0, 16
vle32.v K11, (t0)
addi t0, t0, 16
vle32.v K12, (t0)
addi t0, t0, 16
vle32.v K13, (t0)
addi t0, t0, 16
vle32.v K14, (t0)
addi t0, t0, 16
vle32.v K15, (t0)
// Setup mask for the vmerge to replace the first word (idx==0) in
// message scheduling. There are 4 words, so an 8-bit mask suffices.
vsetivli zero, 1, e8, m1, ta, ma
vmv.v.i MASK, 0x01
// Load the state. The state is stored as {a,b,c,d,e,f,g,h}, but we
// need {f,e,b,a},{h,g,d,c}. The dst vtype is e32m1 and the index vtype
// is e8mf4. We use index-load with the i8 indices {20, 16, 4, 0},
// loaded using the 32-bit little endian value 0x00041014.
li t0, 0x00041014
vsetivli zero, 1, e32, m1, ta, ma
vmv.v.x INDICES, t0
addi STATEP_C, STATEP, 8
vsetivli zero, 4, e32, m1, ta, ma
vluxei8.v FEBA, (STATEP), INDICES
vluxei8.v HGDC, (STATEP_C), INDICES
.Lnext_block:
addi NUM_BLOCKS, NUM_BLOCKS, -1
// Save the previous state, as it's needed later.
vmv.v.v PREV_FEBA, FEBA
vmv.v.v PREV_HGDC, HGDC
// Load the next 512-bit message block and endian-swap each 32-bit word.
vle32.v W0, (DATA)
vrev8.v W0, W0
addi DATA, DATA, 16
vle32.v W1, (DATA)
vrev8.v W1, W1
addi DATA, DATA, 16
vle32.v W2, (DATA)
vrev8.v W2, W2
addi DATA, DATA, 16
vle32.v W3, (DATA)
vrev8.v W3, W3
addi DATA, DATA, 16
// Do the 64 rounds of SHA-256.
sha256_16rounds 0, K0, K1, K2, K3
sha256_16rounds 0, K4, K5, K6, K7
sha256_16rounds 0, K8, K9, K10, K11
sha256_16rounds 1, K12, K13, K14, K15
// Add the previous state.
vadd.vv FEBA, FEBA, PREV_FEBA
vadd.vv HGDC, HGDC, PREV_HGDC
// Repeat if more blocks remain.
bnez NUM_BLOCKS, .Lnext_block
// Store the new state and return.
vsuxei8.v FEBA, (STATEP), INDICES
vsuxei8.v HGDC, (STATEP_C), INDICES
ret
SYM_FUNC_END(sha256_transform_zvknha_or_zvknhb_zvkb)
.section ".rodata"
.p2align 2
.type K256, @object
K256:
.word 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5
.word 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5
.word 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3
.word 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174
.word 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc
.word 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da
.word 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7
.word 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967
.word 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13
.word 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85
.word 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3
.word 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070
.word 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5
.word 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3
.word 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208
.word 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
.size K256, . - K256
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