106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
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/*
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* RISC-V Crypto Emulation Helpers for QEMU.
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*
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* Copyright (c) 2021 Ruibo Lu, luruibo2000@163.com
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* Copyright (c) 2021 Zewen Ye, lustrew@foxmail.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2 or later, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "exec/helper-proto.h"
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#include "crypto/aes.h"
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#include "crypto/sm4.h"
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#define AES_XTIME(a) \
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((a << 1) ^ ((a & 0x80) ? 0x1b : 0))
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#define AES_GFMUL(a, b) (( \
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(((b) & 0x1) ? (a) : 0) ^ \
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(((b) & 0x2) ? AES_XTIME(a) : 0) ^ \
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(((b) & 0x4) ? AES_XTIME(AES_XTIME(a)) : 0) ^ \
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(((b) & 0x8) ? AES_XTIME(AES_XTIME(AES_XTIME(a))) : 0)) & 0xFF)
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static inline uint32_t aes_mixcolumn_byte(uint8_t x, bool fwd)
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{
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uint32_t u;
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if (fwd) {
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u = (AES_GFMUL(x, 3) << 24) | (x << 16) | (x << 8) |
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(AES_GFMUL(x, 2) << 0);
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} else {
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u = (AES_GFMUL(x, 0xb) << 24) | (AES_GFMUL(x, 0xd) << 16) |
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(AES_GFMUL(x, 0x9) << 8) | (AES_GFMUL(x, 0xe) << 0);
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}
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return u;
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}
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#define sext32_xlen(x) (target_ulong)(int32_t)(x)
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static inline target_ulong aes32_operation(target_ulong shamt,
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target_ulong rs1, target_ulong rs2,
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bool enc, bool mix)
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{
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uint8_t si = rs2 >> shamt;
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uint8_t so;
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uint32_t mixed;
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target_ulong res;
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if (enc) {
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so = AES_sbox[si];
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if (mix) {
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mixed = aes_mixcolumn_byte(so, true);
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} else {
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mixed = so;
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}
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} else {
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so = AES_isbox[si];
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if (mix) {
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mixed = aes_mixcolumn_byte(so, false);
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} else {
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mixed = so;
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}
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}
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mixed = rol32(mixed, shamt);
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res = rs1 ^ mixed;
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return sext32_xlen(res);
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}
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target_ulong HELPER(aes32esmi)(target_ulong rs1, target_ulong rs2,
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target_ulong shamt)
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{
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return aes32_operation(shamt, rs1, rs2, true, true);
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}
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target_ulong HELPER(aes32esi)(target_ulong rs1, target_ulong rs2,
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target_ulong shamt)
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{
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return aes32_operation(shamt, rs1, rs2, true, false);
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}
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target_ulong HELPER(aes32dsmi)(target_ulong rs1, target_ulong rs2,
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target_ulong shamt)
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{
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return aes32_operation(shamt, rs1, rs2, false, true);
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}
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target_ulong HELPER(aes32dsi)(target_ulong rs1, target_ulong rs2,
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target_ulong shamt)
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{
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return aes32_operation(shamt, rs1, rs2, false, false);
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}
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#undef sext32_xlen
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