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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Copyright(c) 2011-2016 Intel Corporation All rights reserved.
;
; 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.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; routine to do AES cbc decrypt on 16n bytes doing AES by 4
; XMM registers are clobbered. Saving/restoring must be done at a higher level
; void aes_cbc_dec_128_sse(void *in,
; uint8_t *IV,
; uint8_t keys,
; void *out,
; uint64_t len_bytes);
;
; arg 1: IN: pointer to input (cipher text)
; arg 2: IV: pointer to IV
; arg 3: KEYS: pointer to keys
; arg 4: OUT: pointer to output (plain text)
; arg 5: LEN: length in bytes (multiple of 16)
;
%include "reg_sizes.asm"
%ifidn __OUTPUT_FORMAT__, elf64
%define IN rdi
%define IV rsi
%define KEYS rdx
%define OUT rcx
%define LEN r8
%define func(x) x:
%define FUNC_SAVE
%define FUNC_RESTORE
%endif
%ifidn __OUTPUT_FORMAT__, win64
%define IN rcx
%define IV rdx
%define KEYS r8
%define OUT r9
%define LEN r10
%define PS 8
%define stack_size 10*16 + 1*8 ; must be an odd multiple of 8
%define arg(x) [rsp + stack_size + PS + PS*x]
%define func(x) proc_frame x
%macro FUNC_SAVE 0
alloc_stack stack_size
save_xmm128 xmm6, 0*16
save_xmm128 xmm7, 1*16
save_xmm128 xmm8, 2*16
save_xmm128 xmm9, 3*16
save_xmm128 xmm10, 4*16
save_xmm128 xmm11, 5*16
save_xmm128 xmm12, 6*16
save_xmm128 xmm13, 7*16
save_xmm128 xmm14, 8*16
save_xmm128 xmm15, 9*16
end_prolog
mov LEN, arg(4)
%endmacro
%macro FUNC_RESTORE 0
movdqa xmm6, [rsp + 0*16]
movdqa xmm7, [rsp + 1*16]
movdqa xmm8, [rsp + 2*16]
movdqa xmm9, [rsp + 3*16]
movdqa xmm10, [rsp + 4*16]
movdqa xmm11, [rsp + 5*16]
movdqa xmm12, [rsp + 6*16]
movdqa xmm13, [rsp + 7*16]
movdqa xmm14, [rsp + 8*16]
movdqa xmm15, [rsp + 9*16]
add rsp, stack_size
%endmacro
%endif
; configuration paramaters for AES-CBC macros
%define KEY_ROUNDS 11
%define XMM_USAGE (16)
%define EARLY_BLOCKS (2)
%define PARALLEL_BLOCKS (8)
%define IV_CNT (1)
; instruction set specific operation definitions
%define MOVDQ movdqu
%define PXOR pxor
%define AES_DEC aesdec
%define AES_DEC_LAST aesdeclast
%include "cbc_common.asm"
section .text
align 16
global aes_cbc_dec_128_sse:function
func(aes_cbc_dec_128_sse)
FUNC_SAVE
FILL_KEY_CACHE CKEY_CNT, FIRST_CKEY, KEYS, MOVDQ
MOVDQ reg(IV_IDX), [IV] ; Load IV for next round of block decrypt
mov IDX, 0
cmp LEN, PARALLEL_BLOCKS*16
jge main_loop ; if enough data blocks remain enter main_loop
jmp partials
main_loop:
CBC_DECRYPT_BLOCKS KEY_ROUNDS, PARALLEL_BLOCKS, EARLY_BLOCKS, MOVDQ, PXOR, AES_DEC, AES_DEC_LAST, CKEY_CNT, TMP, TMP_CNT, FIRST_CKEY, KEYS, FIRST_XDATA, IN, OUT, IDX, LEN
cmp LEN, PARALLEL_BLOCKS*16
jge main_loop ; enough blocks to do another full parallel set
jz done
partials: ; fewer than 'PARALLEL_BLOCKS' left do in groups of 4, 2 or 1
cmp LEN, 0
je done
cmp LEN, 4*16
jge initial_4
cmp LEN, 2*16
jge initial_2
initial_1:
CBC_DECRYPT_BLOCKS KEY_ROUNDS, 1, EARLY_BLOCKS, MOVDQ, PXOR, AES_DEC, AES_DEC_LAST, CKEY_CNT, TMP, TMP_CNT, FIRST_CKEY, KEYS, FIRST_XDATA, IN, OUT, IDX, LEN
jmp done
initial_2:
CBC_DECRYPT_BLOCKS KEY_ROUNDS, 2, EARLY_BLOCKS, MOVDQ, PXOR, AES_DEC, AES_DEC_LAST, CKEY_CNT, TMP, TMP_CNT, FIRST_CKEY, KEYS, FIRST_XDATA, IN, OUT, IDX, LEN
jz done
jmp partials
initial_4:
CBC_DECRYPT_BLOCKS KEY_ROUNDS, 4, EARLY_BLOCKS, MOVDQ, PXOR, AES_DEC, AES_DEC_LAST, CKEY_CNT, TMP, TMP_CNT, FIRST_CKEY, KEYS, FIRST_XDATA, IN, OUT, IDX, LEN
jnz partials
done:
FUNC_RESTORE
ret
endproc_frame
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