65 lines
3.1 KiB
C
65 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/bits/emmintrin.internal.h"
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#include "libc/crypto/rijndael.h"
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#include "libc/nexgen32e/x86feature.h"
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forceinline aes_block_t unrijndael$westmere(uint32_t n, aes_block_t x,
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const struct Rijndael *ctx) {
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x ^= ctx->rk[n--].xmm;
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do {
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asm("aesdec\t%2,%0" : "=x"(x) : "0"(x), "m"(ctx->rk[n].xmm));
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} while (--n);
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asm("aesdeclast\t%2,%0" : "=x"(x) : "0"(x), "m"(ctx->rk[n].xmm));
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return x;
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}
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static noinline aes_block_t unrijndael$pure(uint32_t n, aes_block_t x,
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const struct Rijndael *ctx) {
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uint32_t j;
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__v16qu b1, b2;
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x ^= ctx->rk[n--].xmm;
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do {
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b2 = b1 = (__v16qu)x;
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for (j = 0; j < 16; ++j) {
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b2[j] = kAesSboxInverse[b1[j % 4 + j * 13 / 4 % 4 * 4]];
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}
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x = (aes_block_t)b2;
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if (n) x = InvMixColumns(x);
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x ^= ctx->rk[n].xmm;
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} while (n--);
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return x;
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}
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/**
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* Decrypts paragraph w/ AES.
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*
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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 x is 128-bit chunk of ciphertext to decrypt
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* @param ctx was initialized by unrijndaelinit()
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* @return result of transformation
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*/
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aes_block_t unrijndael(uint32_t n, aes_block_t x, const struct Rijndael *ctx) {
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if (X86_HAVE(AES)) {
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return unrijndael$westmere(n, x, ctx);
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} else {
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return unrijndael$pure(n, x, ctx);
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}
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}
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