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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/crypto/unrijndael.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/emmintrin.h"
#include "libc/crypto/rijndael.h"
#include "libc/nexgen32e/x86feature.h"
forceinline aes_block_t unrijndael$westmere(uint32_t n, aes_block_t x,
const struct Rijndael *ctx) {
x ^= ctx->rk[n--].xmm;
do {
asm("aesdec\t%2,%0" : "=x"(x) : "0"(x), "m"(ctx->rk[n].xmm));
} while (--n);
asm("aesdeclast\t%2,%0" : "=x"(x) : "0"(x), "m"(ctx->rk[n].xmm));
return x;
}
static noinline aes_block_t unrijndael$pure(uint32_t n, aes_block_t x,
const struct Rijndael *ctx) {
uint32_t j;
__v16qu b1, b2;
x ^= ctx->rk[n--].xmm;
do {
b2 = b1 = (__v16qu)x;
for (j = 0; j < 16; ++j) {
b2[j] = kAesSboxInverse[b1[j % 4 + j * 13 / 4 % 4 * 4]];
}
x = (aes_block_t)b2;
if (n) x = InvMixColumns(x);
x ^= ctx->rk[n].xmm;
} while (n--);
return x;
}
/**
* Decrypts paragraph w/ AES.
*
* @param n is 14 for AES-256, 12 for AES-192, and 10 for AES-128
* @param x is 128-bit chunk of ciphertext to decrypt
* @param ctx was initialized by unrijndaelinit()
* @return result of transformation
*/
aes_block_t unrijndael(uint32_t n, aes_block_t x, const struct Rijndael *ctx) {
if (X86_HAVE(AES)) {
return unrijndael$westmere(n, x, ctx);
} else {
return unrijndael$pure(n, x, ctx);
}
}