71 lines
3.2 KiB
C
71 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/bits/xmmintrin.h"
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#include "libc/crypto/rijndael.h"
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#include "libc/nexgen32e/x86feature.h"
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static void unrijndaelinit$westmere(struct Rijndael *ctx, uint32_t n,
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aes_block_t k1, aes_block_t k2) {
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uint32_t i;
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aes_block_t x;
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assert(n > 1);
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rijndaelinit(ctx, n, k1, k2);
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i = 1;
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do {
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x = ctx->rk[i].xmm;
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asm("aesimc\t%1,%0" : "=x"(x) : "0"(x));
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ctx->rk[i].xmm = x;
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} while (++i < n);
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XMM_DESTROY(x);
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}
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static relegated noinline void unrijndaelinit$pure(struct Rijndael *ctx,
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uint32_t n, aes_block_t k1,
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aes_block_t k2) {
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uint32_t i;
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aes_block_t x;
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assert(n > 1);
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rijndaelinit(ctx, n, k1, k2);
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i = 1;
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do {
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x = ctx->rk[i].xmm;
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x = InvMixColumns(x);
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ctx->rk[i].xmm = x;
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} while (++i < n);
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XMM_DESTROY(x);
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}
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/**
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* Computes key schedule for unrijndael().
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*
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* @param rk receives round keys
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* @param n is 14 for AES-256, 12 for AES-192, and 10 for AES-128
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* @param k1/k2 holds the master key
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*/
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void unrijndaelinit(struct Rijndael *ctx, uint32_t n, aes_block_t k1,
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aes_block_t k2) {
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if (X86_HAVE(AES)) {
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return unrijndaelinit$westmere(ctx, n, k1, k2);
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} else {
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return unrijndaelinit$pure(ctx, n, k1, k2);
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}
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}
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