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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/crypto/unrijndaelinit.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/assert.h"
#include "libc/bits/xmmintrin.h"
#include "libc/crypto/rijndael.h"
#include "libc/nexgen32e/x86feature.h"
static void unrijndaelinit$westmere(struct Rijndael *ctx, uint32_t n,
aes_block_t k1, aes_block_t k2) {
uint32_t i;
aes_block_t x;
assert(n > 1);
rijndaelinit(ctx, n, k1, k2);
i = 1;
do {
x = ctx->rk[i].xmm;
asm("aesimc\t%1,%0" : "=x"(x) : "0"(x));
ctx->rk[i].xmm = x;
} while (i++ < n);
XMM_DESTROY(x);
}
static relegated noinline void unrijndaelinit$pure(struct Rijndael *ctx,
uint32_t n, aes_block_t k1,
aes_block_t k2) {
uint32_t i;
aes_block_t x;
assert(n > 1);
rijndaelinit(ctx, n, k1, k2);
i = 1;
do {
x = ctx->rk[i].xmm;
x = InvMixColumns(x);
ctx->rk[i].xmm = x;
} while (i++ < n);
XMM_DESTROY(x);
}
/**
* Computes key schedule for unrijndael().
*
* @param rk receives round keys
* @param n is 14 for AES-256, 12 for AES-192, and 10 for AES-128
* @param k1/k2 holds the master key
*/
void unrijndaelinit(struct Rijndael *ctx, uint32_t n, aes_block_t k1,
aes_block_t k2) {
if (X86_HAVE(AES)) {
return unrijndaelinit$westmere(ctx, n, k1, k2);
} else {
return unrijndaelinit$pure(ctx, n, k1, k2);
}
}