70 lines
3.1 KiB
C
70 lines
3.1 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/bits/xmmintrin.internal.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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