69 lines
3.1 KiB
C
69 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/bits.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/dce.h"
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#include "libc/str/internal.h"
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#define ROR(w, k) (CheckUnsigned(w) >> (k) | (w) << (sizeof(w) * 8 - (k)))
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static const uint8_t Rcon[11] = {0x8d, 0x01, 0x02, 0x04, 0x08, 0x10,
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0x20, 0x40, 0x80, 0x1b, 0x36};
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forceinline uint32_t SubRot(uint32_t t) {
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uint32_t j;
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for (j = 0; j < 4; j++) {
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t = (t & -256) | kAesSbox[t & 255];
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t = ROR(t, 8);
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}
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return t;
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}
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/**
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* Computes key schedule for rijndael().
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*
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* @param ctx 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 rijndaelinit(struct Rijndael *ctx, uint32_t n, aes_block_t k1,
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aes_block_t k2) {
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#define Nk (n - 6)
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#define W(i) (ctx->rk[(i) / 4].u32[(i) % 4])
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#define K(i) ((i) < 4 ? k1[i] : k2[(i)-4])
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uint32_t i, t;
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ctx->rk[0].xmm = k1;
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ctx->rk[1].xmm = k2;
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for (i = Nk; i < 4 * (n + 1); ++i) {
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t = W(i - 1);
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if (i % Nk == 0) {
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t = ROR(t, 8);
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t = SubRot(t);
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t ^= Rcon[i / Nk];
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} else if (Nk > 6 && i % Nk == 4) {
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t = SubRot(t);
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}
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W(i) = W(i - Nk) ^ t;
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}
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XMM_DESTROY(k1);
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XMM_DESTROY(k2);
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}
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