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/*
* Intel SHA Extensions optimized implementation of a SHA-1 update function
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2015 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* Contact Information:
* Sean Gulley <sean.m.gulley@intel.com>
* Tim Chen <tim.c.chen@linux.intel.com>
*
* BSD LICENSE
*
* Copyright(c) 2015 Intel Corporation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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.
*
*/
#include <linux/linkage.h>
#define DIGEST_PTR %rdi /* 1st arg */
#define DATA_PTR %rsi /* 2nd arg */
#define NUM_BLKS %rdx /* 3rd arg */
#define RSPSAVE %rax
/* gcc conversion */
#define FRAME_SIZE 32 /* space for 2x16 bytes */
#define ABCD %xmm0
#define E0 %xmm1 /* Need two E's b/c they ping pong */
#define E1 %xmm2
#define MSG0 %xmm3
#define MSG1 %xmm4
#define MSG2 %xmm5
#define MSG3 %xmm6
#define SHUF_MASK %xmm7
/*
* Intel SHA Extensions optimized implementation of a SHA-1 update function
*
* The function takes a pointer to the current hash values, a pointer to the
* input data, and a number of 64 byte blocks to process. Once all blocks have
* been processed, the digest pointer is updated with the resulting hash value.
* The function only processes complete blocks, there is no functionality to
* store partial blocks. All message padding and hash value initialization must
* be done outside the update function.
*
* The indented lines in the loop are instructions related to rounds processing.
* The non-indented lines are instructions related to the message schedule.
*
* void sha1_ni_transform(uint32_t *digest, const void *data,
uint32_t numBlocks)
* digest : pointer to digest
* data: pointer to input data
* numBlocks: Number of blocks to process
*/
.text
.align 32
SYM_FUNC_START(sha1_ni_transform)
mov %rsp, RSPSAVE
sub $FRAME_SIZE, %rsp
and $~0xF, %rsp
shl $6, NUM_BLKS /* convert to bytes */
jz .Ldone_hash
add DATA_PTR, NUM_BLKS /* pointer to end of data */
/* load initial hash values */
pinsrd $3, 1*16(DIGEST_PTR), E0
movdqu 0*16(DIGEST_PTR), ABCD
pand UPPER_WORD_MASK(%rip), E0
pshufd $0x1B, ABCD, ABCD
movdqa PSHUFFLE_BYTE_FLIP_MASK(%rip), SHUF_MASK
.Lloop0:
/* Save hash values for addition after rounds */
movdqa E0, (0*16)(%rsp)
movdqa ABCD, (1*16)(%rsp)
/* Rounds 0-3 */
movdqu 0*16(DATA_PTR), MSG0
pshufb SHUF_MASK, MSG0
paddd MSG0, E0
movdqa ABCD, E1
sha1rnds4 $0, E0, ABCD
/* Rounds 4-7 */
movdqu 1*16(DATA_PTR), MSG1
pshufb SHUF_MASK, MSG1
sha1nexte MSG1, E1
movdqa ABCD, E0
sha1rnds4 $0, E1, ABCD
sha1msg1 MSG1, MSG0
/* Rounds 8-11 */
movdqu 2*16(DATA_PTR), MSG2
pshufb SHUF_MASK, MSG2
sha1nexte MSG2, E0
movdqa ABCD, E1
sha1rnds4 $0, E0, ABCD
sha1msg1 MSG2, MSG1
pxor MSG2, MSG0
/* Rounds 12-15 */
movdqu 3*16(DATA_PTR), MSG3
pshufb SHUF_MASK, MSG3
sha1nexte MSG3, E1
movdqa ABCD, E0
sha1msg2 MSG3, MSG0
sha1rnds4 $0, E1, ABCD
sha1msg1 MSG3, MSG2
pxor MSG3, MSG1
/* Rounds 16-19 */
sha1nexte MSG0, E0
movdqa ABCD, E1
sha1msg2 MSG0, MSG1
sha1rnds4 $0, E0, ABCD
sha1msg1 MSG0, MSG3
pxor MSG0, MSG2
/* Rounds 20-23 */
sha1nexte MSG1, E1
movdqa ABCD, E0
sha1msg2 MSG1, MSG2
sha1rnds4 $1, E1, ABCD
sha1msg1 MSG1, MSG0
pxor MSG1, MSG3
/* Rounds 24-27 */
sha1nexte MSG2, E0
movdqa ABCD, E1
sha1msg2 MSG2, MSG3
sha1rnds4 $1, E0, ABCD
sha1msg1 MSG2, MSG1
pxor MSG2, MSG0
/* Rounds 28-31 */
sha1nexte MSG3, E1
movdqa ABCD, E0
sha1msg2 MSG3, MSG0
sha1rnds4 $1, E1, ABCD
sha1msg1 MSG3, MSG2
pxor MSG3, MSG1
/* Rounds 32-35 */
sha1nexte MSG0, E0
movdqa ABCD, E1
sha1msg2 MSG0, MSG1
sha1rnds4 $1, E0, ABCD
sha1msg1 MSG0, MSG3
pxor MSG0, MSG2
/* Rounds 36-39 */
sha1nexte MSG1, E1
movdqa ABCD, E0
sha1msg2 MSG1, MSG2
sha1rnds4 $1, E1, ABCD
sha1msg1 MSG1, MSG0
pxor MSG1, MSG3
/* Rounds 40-43 */
sha1nexte MSG2, E0
movdqa ABCD, E1
sha1msg2 MSG2, MSG3
sha1rnds4 $2, E0, ABCD
sha1msg1 MSG2, MSG1
pxor MSG2, MSG0
/* Rounds 44-47 */
sha1nexte MSG3, E1
movdqa ABCD, E0
sha1msg2 MSG3, MSG0
sha1rnds4 $2, E1, ABCD
sha1msg1 MSG3, MSG2
pxor MSG3, MSG1
/* Rounds 48-51 */
sha1nexte MSG0, E0
movdqa ABCD, E1
sha1msg2 MSG0, MSG1
sha1rnds4 $2, E0, ABCD
sha1msg1 MSG0, MSG3
pxor MSG0, MSG2
/* Rounds 52-55 */
sha1nexte MSG1, E1
movdqa ABCD, E0
sha1msg2 MSG1, MSG2
sha1rnds4 $2, E1, ABCD
sha1msg1 MSG1, MSG0
pxor MSG1, MSG3
/* Rounds 56-59 */
sha1nexte MSG2, E0
movdqa ABCD, E1
sha1msg2 MSG2, MSG3
sha1rnds4 $2, E0, ABCD
sha1msg1 MSG2, MSG1
pxor MSG2, MSG0
/* Rounds 60-63 */
sha1nexte MSG3, E1
movdqa ABCD, E0
sha1msg2 MSG3, MSG0
sha1rnds4 $3, E1, ABCD
sha1msg1 MSG3, MSG2
pxor MSG3, MSG1
/* Rounds 64-67 */
sha1nexte MSG0, E0
movdqa ABCD, E1
sha1msg2 MSG0, MSG1
sha1rnds4 $3, E0, ABCD
sha1msg1 MSG0, MSG3
pxor MSG0, MSG2
/* Rounds 68-71 */
sha1nexte MSG1, E1
movdqa ABCD, E0
sha1msg2 MSG1, MSG2
sha1rnds4 $3, E1, ABCD
pxor MSG1, MSG3
/* Rounds 72-75 */
sha1nexte MSG2, E0
movdqa ABCD, E1
sha1msg2 MSG2, MSG3
sha1rnds4 $3, E0, ABCD
/* Rounds 76-79 */
sha1nexte MSG3, E1
movdqa ABCD, E0
sha1rnds4 $3, E1, ABCD
/* Add current hash values with previously saved */
sha1nexte (0*16)(%rsp), E0
paddd (1*16)(%rsp), ABCD
/* Increment data pointer and loop if more to process */
add $64, DATA_PTR
cmp NUM_BLKS, DATA_PTR
jne .Lloop0
/* Write hash values back in the correct order */
pshufd $0x1B, ABCD, ABCD
movdqu ABCD, 0*16(DIGEST_PTR)
pextrd $3, E0, 1*16(DIGEST_PTR)
.Ldone_hash:
mov RSPSAVE, %rsp
RET
SYM_FUNC_END(sha1_ni_transform)
.section .rodata.cst16.PSHUFFLE_BYTE_FLIP_MASK, "aM", @progbits, 16
.align 16
PSHUFFLE_BYTE_FLIP_MASK:
.octa 0x000102030405060708090a0b0c0d0e0f
.section .rodata.cst16.UPPER_WORD_MASK, "aM", @progbits, 16
.align 16
UPPER_WORD_MASK:
.octa 0xFFFFFFFF000000000000000000000000
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