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/* ARMv8 Crypto Extension AES for Libgcrypt
* Copyright (C) 2016, 2022 Jussi Kivilinna <jussi.kivilinna@iki.fi>
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* for memcmp() */
#include "types.h" /* for byte and u32 typedefs */
#include "g10lib.h"
#include "cipher.h"
#include "bufhelp.h"
#include "rijndael-internal.h"
#include "./cipher-internal.h"
#ifdef USE_ARM_CE
typedef struct u128_s { u32 a, b, c, d; } u128_t;
extern u32 _gcry_aes_sbox4_armv8_ce(u32 in4b);
extern void _gcry_aes_invmixcol_armv8_ce(u128_t *dst, const u128_t *src);
extern unsigned int _gcry_aes_enc_armv8_ce(const void *keysched, byte *dst,
const byte *src,
unsigned int nrounds);
extern unsigned int _gcry_aes_dec_armv8_ce(const void *keysched, byte *dst,
const byte *src,
unsigned int nrounds);
extern void _gcry_aes_cbc_enc_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
unsigned char *iv, size_t nblocks,
int cbc_mac, unsigned int nrounds);
extern void _gcry_aes_cbc_dec_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
unsigned char *iv, size_t nblocks,
unsigned int nrounds);
extern void _gcry_aes_cfb_enc_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
unsigned char *iv, size_t nblocks,
unsigned int nrounds);
extern void _gcry_aes_cfb_dec_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
unsigned char *iv, size_t nblocks,
unsigned int nrounds);
extern void _gcry_aes_ctr_enc_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
unsigned char *iv, size_t nblocks,
unsigned int nrounds);
extern void _gcry_aes_ctr32le_enc_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
unsigned char *iv, size_t nblocks,
unsigned int nrounds);
extern size_t _gcry_aes_ocb_enc_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
unsigned char *offset,
unsigned char *checksum,
unsigned char *L_table,
size_t nblocks,
unsigned int nrounds,
unsigned int blkn);
extern size_t _gcry_aes_ocb_dec_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
unsigned char *offset,
unsigned char *checksum,
unsigned char *L_table,
size_t nblocks,
unsigned int nrounds,
unsigned int blkn);
extern size_t _gcry_aes_ocb_auth_armv8_ce (const void *keysched,
const unsigned char *abuf,
unsigned char *offset,
unsigned char *checksum,
unsigned char *L_table,
size_t nblocks,
unsigned int nrounds,
unsigned int blkn);
extern void _gcry_aes_xts_enc_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
unsigned char *tweak,
size_t nblocks, unsigned int nrounds);
extern void _gcry_aes_xts_dec_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
unsigned char *tweak,
size_t nblocks, unsigned int nrounds);
extern void _gcry_aes_ecb_enc_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
size_t nblocks, unsigned int nrounds);
extern void _gcry_aes_ecb_dec_armv8_ce (const void *keysched,
unsigned char *outbuf,
const unsigned char *inbuf,
size_t nblocks, unsigned int nrounds);
void
_gcry_aes_armv8_ce_setkey (RIJNDAEL_context *ctx, const byte *key)
{
unsigned int rounds = ctx->rounds;
unsigned int KC = rounds - 6;
u32 *W_u32 = ctx->keyschenc32b;
unsigned int i, j;
u32 W_prev;
byte rcon = 1;
for (i = 0; i < KC; i += 2)
{
W_u32[i + 0] = buf_get_le32(key + i * 4 + 0);
W_u32[i + 1] = buf_get_le32(key + i * 4 + 4);
}
for (i = KC, j = KC, W_prev = W_u32[KC - 1];
i < 4 * (rounds + 1);
i += 2, j += 2)
{
u32 temp0 = W_prev;
u32 temp1;
if (j == KC)
{
j = 0;
temp0 = _gcry_aes_sbox4_armv8_ce(rol(temp0, 24)) ^ rcon;
rcon = ((rcon << 1) ^ (-(rcon >> 7) & 0x1b)) & 0xff;
}
else if (KC == 8 && j == 4)
{
temp0 = _gcry_aes_sbox4_armv8_ce(temp0);
}
temp1 = W_u32[i - KC + 0];
W_u32[i + 0] = temp0 ^ temp1;
W_u32[i + 1] = W_u32[i - KC + 1] ^ temp0 ^ temp1;
W_prev = W_u32[i + 1];
}
}
/* Make a decryption key from an encryption key. */
void
_gcry_aes_armv8_ce_prepare_decryption (RIJNDAEL_context *ctx)
{
u128_t *ekey = (u128_t *)(void *)ctx->keyschenc;
u128_t *dkey = (u128_t *)(void *)ctx->keyschdec;
int rounds = ctx->rounds;
int rr;
int r;
#define DO_AESIMC() _gcry_aes_invmixcol_armv8_ce(&dkey[r], &ekey[rr])
dkey[0] = ekey[rounds];
r = 1;
rr = rounds-1;
DO_AESIMC(); r++; rr--; /* round 1 */
DO_AESIMC(); r++; rr--; /* round 2 */
DO_AESIMC(); r++; rr--; /* round 3 */
DO_AESIMC(); r++; rr--; /* round 4 */
DO_AESIMC(); r++; rr--; /* round 5 */
DO_AESIMC(); r++; rr--; /* round 6 */
DO_AESIMC(); r++; rr--; /* round 7 */
DO_AESIMC(); r++; rr--; /* round 8 */
DO_AESIMC(); r++; rr--; /* round 9 */
if (rounds >= 12)
{
if (rounds > 12)
{
DO_AESIMC(); r++; rr--; /* round 10 */
DO_AESIMC(); r++; rr--; /* round 11 */
}
DO_AESIMC(); r++; rr--; /* round 12 / 10 */
DO_AESIMC(); r++; rr--; /* round 13 / 11 */
}
dkey[r] = ekey[0];
#undef DO_AESIMC
}
unsigned int
_gcry_aes_armv8_ce_encrypt (const RIJNDAEL_context *ctx, unsigned char *dst,
const unsigned char *src)
{
const void *keysched = ctx->keyschenc32;
unsigned int nrounds = ctx->rounds;
return _gcry_aes_enc_armv8_ce(keysched, dst, src, nrounds);
}
unsigned int
_gcry_aes_armv8_ce_decrypt (const RIJNDAEL_context *ctx, unsigned char *dst,
const unsigned char *src)
{
const void *keysched = ctx->keyschdec32;
unsigned int nrounds = ctx->rounds;
return _gcry_aes_dec_armv8_ce(keysched, dst, src, nrounds);
}
void
_gcry_aes_armv8_ce_cbc_enc (const RIJNDAEL_context *ctx, unsigned char *iv,
unsigned char *outbuf, const unsigned char *inbuf,
size_t nblocks, int cbc_mac)
{
const void *keysched = ctx->keyschenc32;
unsigned int nrounds = ctx->rounds;
_gcry_aes_cbc_enc_armv8_ce(keysched, outbuf, inbuf, iv, nblocks, cbc_mac,
nrounds);
}
void
_gcry_aes_armv8_ce_cbc_dec (RIJNDAEL_context *ctx, unsigned char *iv,
unsigned char *outbuf, const unsigned char *inbuf,
size_t nblocks)
{
const void *keysched = ctx->keyschdec32;
unsigned int nrounds = ctx->rounds;
if ( !ctx->decryption_prepared )
{
_gcry_aes_armv8_ce_prepare_decryption ( ctx );
ctx->decryption_prepared = 1;
}
_gcry_aes_cbc_dec_armv8_ce(keysched, outbuf, inbuf, iv, nblocks, nrounds);
}
void
_gcry_aes_armv8_ce_cfb_enc (RIJNDAEL_context *ctx, unsigned char *iv,
unsigned char *outbuf, const unsigned char *inbuf,
size_t nblocks)
{
const void *keysched = ctx->keyschenc32;
unsigned int nrounds = ctx->rounds;
_gcry_aes_cfb_enc_armv8_ce(keysched, outbuf, inbuf, iv, nblocks, nrounds);
}
void
_gcry_aes_armv8_ce_cfb_dec (RIJNDAEL_context *ctx, unsigned char *iv,
unsigned char *outbuf, const unsigned char *inbuf,
size_t nblocks)
{
const void *keysched = ctx->keyschenc32;
unsigned int nrounds = ctx->rounds;
_gcry_aes_cfb_dec_armv8_ce(keysched, outbuf, inbuf, iv, nblocks, nrounds);
}
void
_gcry_aes_armv8_ce_ctr_enc (RIJNDAEL_context *ctx, unsigned char *iv,
unsigned char *outbuf, const unsigned char *inbuf,
size_t nblocks)
{
const void *keysched = ctx->keyschenc32;
unsigned int nrounds = ctx->rounds;
_gcry_aes_ctr_enc_armv8_ce(keysched, outbuf, inbuf, iv, nblocks, nrounds);
}
void
_gcry_aes_armv8_ce_ctr32le_enc (RIJNDAEL_context *ctx, unsigned char *iv,
unsigned char *outbuf,
const unsigned char *inbuf, size_t nblocks)
{
const void *keysched = ctx->keyschenc32;
unsigned int nrounds = ctx->rounds;
_gcry_aes_ctr32le_enc_armv8_ce(keysched, outbuf, inbuf, iv, nblocks, nrounds);
}
size_t
_gcry_aes_armv8_ce_ocb_crypt (gcry_cipher_hd_t c, void *outbuf_arg,
const void *inbuf_arg, size_t nblocks,
int encrypt)
{
RIJNDAEL_context *ctx = (void *)&c->context.c;
const void *keysched = encrypt ? ctx->keyschenc32 : ctx->keyschdec32;
unsigned char *outbuf = outbuf_arg;
const unsigned char *inbuf = inbuf_arg;
unsigned int nrounds = ctx->rounds;
u64 blkn = c->u_mode.ocb.data_nblocks;
if ( !encrypt && !ctx->decryption_prepared )
{
_gcry_aes_armv8_ce_prepare_decryption ( ctx );
ctx->decryption_prepared = 1;
}
c->u_mode.ocb.data_nblocks = blkn + nblocks;
if (encrypt)
return _gcry_aes_ocb_enc_armv8_ce (keysched, outbuf, inbuf,
c->u_iv.iv, c->u_ctr.ctr,
c->u_mode.ocb.L[0], nblocks, nrounds,
(unsigned int)blkn);
else
return _gcry_aes_ocb_dec_armv8_ce (keysched, outbuf, inbuf,
c->u_iv.iv, c->u_ctr.ctr,
c->u_mode.ocb.L[0], nblocks, nrounds,
(unsigned int)blkn);
}
size_t
_gcry_aes_armv8_ce_ocb_auth (gcry_cipher_hd_t c, void *abuf_arg,
size_t nblocks)
{
RIJNDAEL_context *ctx = (void *)&c->context.c;
const void *keysched = ctx->keyschenc32;
const unsigned char *abuf = abuf_arg;
unsigned int nrounds = ctx->rounds;
u64 blkn = c->u_mode.ocb.aad_nblocks;
c->u_mode.ocb.aad_nblocks = blkn + nblocks;
return _gcry_aes_ocb_auth_armv8_ce (keysched, abuf, c->u_mode.ocb.aad_offset,
c->u_mode.ocb.aad_sum, c->u_mode.ocb.L[0],
nblocks, nrounds, (unsigned int)blkn);
}
void
_gcry_aes_armv8_ce_xts_crypt (RIJNDAEL_context *ctx, unsigned char *tweak,
unsigned char *outbuf, const unsigned char *inbuf,
size_t nblocks, int encrypt)
{
const void *keysched = encrypt ? ctx->keyschenc32 : ctx->keyschdec32;
unsigned int nrounds = ctx->rounds;
if ( !encrypt && !ctx->decryption_prepared )
{
_gcry_aes_armv8_ce_prepare_decryption ( ctx );
ctx->decryption_prepared = 1;
}
if (encrypt)
_gcry_aes_xts_enc_armv8_ce (keysched, outbuf, inbuf, tweak,
nblocks, nrounds);
else
_gcry_aes_xts_dec_armv8_ce (keysched, outbuf, inbuf, tweak,
nblocks, nrounds);
}
void
_gcry_aes_armv8_ce_ecb_crypt (void *context, void *outbuf,
const void *inbuf, size_t nblocks,
int encrypt)
{
RIJNDAEL_context *ctx = context;
const void *keysched = encrypt ? ctx->keyschenc32 : ctx->keyschdec32;
unsigned int nrounds = ctx->rounds;
if ( !encrypt && !ctx->decryption_prepared )
{
_gcry_aes_armv8_ce_prepare_decryption ( ctx );
ctx->decryption_prepared = 1;
}
if (encrypt)
_gcry_aes_ecb_enc_armv8_ce (keysched, outbuf, inbuf, nblocks, nrounds);
else
_gcry_aes_ecb_dec_armv8_ce (keysched, outbuf, inbuf, nblocks, nrounds);
}
#endif /* USE_ARM_CE */
|
