Commit b27be3a6 authored by Niels Möller's avatar Niels Möller

New internal functions _aes_set_key and _aes_invert.

parent d6fadad8
2013-05-22 Niels Möller <nisse@lysator.liu.se>
* Makefile.in (nettle_SOURCES): Added aes-invert-internal.c and
aes-set-key-internal.c.
* aes.h (AES128_KEY_SIZE, _AES128_ROUNDS): New constants.
Similarly also for aes192 and aes256.
* aes-internal.h: Declare new functions.
* aes-set-key-internal.c (_aes_set_key): New file and funxtion
extracted from aes_set_encrypt_key.
* aes-set-encrypt-key.c (aes_set_encrypt_key): Use _aes_set_key.
* aes-invert-internal.c (_aes_invert): New file and function,
extracted from aes_invert_key.
* aes-set-decrypt-key.c (aes_invert_key): Use _aes_invert.
* arm/v6/aes-encrypt-internal.asm: Adapted to new interface.
Unfortunately, 4% slowdown on Cortex-A9, for unknown reason.
* arm/v6/aes-decrypt-internal.asm: Likewise.
......
......@@ -63,6 +63,7 @@ all-here: $(TARGETS) $(DOCTARGETS)
nettle_SOURCES = aes-decrypt-internal.c aes-decrypt.c \
aes-encrypt-internal.c aes-encrypt.c aes-encrypt-table.c \
aes-invert-internal.c aes-set-key-internal.c \
aes-set-encrypt-key.c aes-set-decrypt-key.c aes-meta.c \
arcfour.c arcfour-crypt.c arcfour-meta.c \
arctwo.c arctwo-meta.c gosthash94-meta.c \
......
......@@ -29,6 +29,8 @@
#include "aes.h"
/* Name mangling */
#define _aes_set_key _nettle_aes_set_key
#define _aes_invert _nettle_aes_invert
#define _aes_encrypt _nettle_aes_encrypt
#define _aes_decrypt _nettle_aes_decrypt
#define _aes_encrypt_table _nettle_aes_encrypt_table
......@@ -50,6 +52,13 @@ struct aes_table
uint32_t table[AES_TABLE_SIZE][0x100];
};
void
_aes_set_key(unsigned nr, unsigned nk,
uint32_t *subkeys, const uint8_t *key);
void
_aes_invert(unsigned rounds, uint32_t *dst, const uint32_t *src);
void
_aes_encrypt(unsigned rounds, const uint32_t *keys,
const struct aes_table *T,
......
/* aes-invert-internal.c
*
* Inverse key setup for the aes/rijndael block cipher.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2000, 2001, 2002, Rafael R. Sevilla, Niels Möller
* Copyright (C) 2013 Niels Möller
*
* The nettle library 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.
*
* The nettle library 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 the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
/* Originally written by Rafael R. Sevilla <dido@pacific.net.ph> */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "aes-internal.h"
#include "macros.h"
/* NOTE: We don't include rotated versions of the table. */
static const uint32_t mtable[0x100] =
{
0x00000000,0x0b0d090e,0x161a121c,0x1d171b12,
0x2c342438,0x27392d36,0x3a2e3624,0x31233f2a,
0x58684870,0x5365417e,0x4e725a6c,0x457f5362,
0x745c6c48,0x7f516546,0x62467e54,0x694b775a,
0xb0d090e0,0xbbdd99ee,0xa6ca82fc,0xadc78bf2,
0x9ce4b4d8,0x97e9bdd6,0x8afea6c4,0x81f3afca,
0xe8b8d890,0xe3b5d19e,0xfea2ca8c,0xf5afc382,
0xc48cfca8,0xcf81f5a6,0xd296eeb4,0xd99be7ba,
0x7bbb3bdb,0x70b632d5,0x6da129c7,0x66ac20c9,
0x578f1fe3,0x5c8216ed,0x41950dff,0x4a9804f1,
0x23d373ab,0x28de7aa5,0x35c961b7,0x3ec468b9,
0x0fe75793,0x04ea5e9d,0x19fd458f,0x12f04c81,
0xcb6bab3b,0xc066a235,0xdd71b927,0xd67cb029,
0xe75f8f03,0xec52860d,0xf1459d1f,0xfa489411,
0x9303e34b,0x980eea45,0x8519f157,0x8e14f859,
0xbf37c773,0xb43ace7d,0xa92dd56f,0xa220dc61,
0xf66d76ad,0xfd607fa3,0xe07764b1,0xeb7a6dbf,
0xda595295,0xd1545b9b,0xcc434089,0xc74e4987,
0xae053edd,0xa50837d3,0xb81f2cc1,0xb31225cf,
0x82311ae5,0x893c13eb,0x942b08f9,0x9f2601f7,
0x46bde64d,0x4db0ef43,0x50a7f451,0x5baafd5f,
0x6a89c275,0x6184cb7b,0x7c93d069,0x779ed967,
0x1ed5ae3d,0x15d8a733,0x08cfbc21,0x03c2b52f,
0x32e18a05,0x39ec830b,0x24fb9819,0x2ff69117,
0x8dd64d76,0x86db4478,0x9bcc5f6a,0x90c15664,
0xa1e2694e,0xaaef6040,0xb7f87b52,0xbcf5725c,
0xd5be0506,0xdeb30c08,0xc3a4171a,0xc8a91e14,
0xf98a213e,0xf2872830,0xef903322,0xe49d3a2c,
0x3d06dd96,0x360bd498,0x2b1ccf8a,0x2011c684,
0x1132f9ae,0x1a3ff0a0,0x0728ebb2,0x0c25e2bc,
0x656e95e6,0x6e639ce8,0x737487fa,0x78798ef4,
0x495ab1de,0x4257b8d0,0x5f40a3c2,0x544daacc,
0xf7daec41,0xfcd7e54f,0xe1c0fe5d,0xeacdf753,
0xdbeec879,0xd0e3c177,0xcdf4da65,0xc6f9d36b,
0xafb2a431,0xa4bfad3f,0xb9a8b62d,0xb2a5bf23,
0x83868009,0x888b8907,0x959c9215,0x9e919b1b,
0x470a7ca1,0x4c0775af,0x51106ebd,0x5a1d67b3,
0x6b3e5899,0x60335197,0x7d244a85,0x7629438b,
0x1f6234d1,0x146f3ddf,0x097826cd,0x02752fc3,
0x335610e9,0x385b19e7,0x254c02f5,0x2e410bfb,
0x8c61d79a,0x876cde94,0x9a7bc586,0x9176cc88,
0xa055f3a2,0xab58faac,0xb64fe1be,0xbd42e8b0,
0xd4099fea,0xdf0496e4,0xc2138df6,0xc91e84f8,
0xf83dbbd2,0xf330b2dc,0xee27a9ce,0xe52aa0c0,
0x3cb1477a,0x37bc4e74,0x2aab5566,0x21a65c68,
0x10856342,0x1b886a4c,0x069f715e,0x0d927850,
0x64d90f0a,0x6fd40604,0x72c31d16,0x79ce1418,
0x48ed2b32,0x43e0223c,0x5ef7392e,0x55fa3020,
0x01b79aec,0x0aba93e2,0x17ad88f0,0x1ca081fe,
0x2d83bed4,0x268eb7da,0x3b99acc8,0x3094a5c6,
0x59dfd29c,0x52d2db92,0x4fc5c080,0x44c8c98e,
0x75ebf6a4,0x7ee6ffaa,0x63f1e4b8,0x68fcedb6,
0xb1670a0c,0xba6a0302,0xa77d1810,0xac70111e,
0x9d532e34,0x965e273a,0x8b493c28,0x80443526,
0xe90f427c,0xe2024b72,0xff155060,0xf418596e,
0xc53b6644,0xce366f4a,0xd3217458,0xd82c7d56,
0x7a0ca137,0x7101a839,0x6c16b32b,0x671bba25,
0x5638850f,0x5d358c01,0x40229713,0x4b2f9e1d,
0x2264e947,0x2969e049,0x347efb5b,0x3f73f255,
0x0e50cd7f,0x055dc471,0x184adf63,0x1347d66d,
0xcadc31d7,0xc1d138d9,0xdcc623cb,0xd7cb2ac5,
0xe6e815ef,0xede51ce1,0xf0f207f3,0xfbff0efd,
0x92b479a7,0x99b970a9,0x84ae6bbb,0x8fa362b5,
0xbe805d9f,0xb58d5491,0xa89a4f83,0xa397468d,
};
#define MIX_COLUMN(T, key) do { \
uint32_t _k, _nk, _t; \
_k = (key); \
_nk = T[_k & 0xff]; \
_k >>= 8; \
_t = T[_k & 0xff]; \
_nk ^= ROTL32(8, _t); \
_k >>= 8; \
_t = T[_k & 0xff]; \
_nk ^= ROTL32(16, _t); \
_k >>= 8; \
_t = T[_k & 0xff]; \
_nk ^= ROTL32(24, _t); \
(key) = _nk; \
} while(0)
#define SWAP(a, b) \
do { uint32_t t_swap = (a); (a) = (b); (b) = t_swap; } while(0)
void
_aes_invert(unsigned rounds, uint32_t *dst, const uint32_t *src)
{
unsigned i;
/* Reverse the order of subkeys, in groups of 4. */
/* FIXME: Instead of reordering the subkeys, change the access order
of aes_decrypt, since it's a separate function anyway? */
if (src == dst)
{
unsigned j, k;
for (i = 0, j = rounds * 4;
i < j;
i += 4, j -= 4)
for (k = 0; k<4; k++)
SWAP(dst[i+k], dst[j+k]);
}
else
{
unsigned k;
for (i = 0; i <= rounds * 4; i += 4)
for (k = 0; k < 4; k++)
dst[i+k] = src[rounds * 4 - i + k];
}
/* Transform all subkeys but the first and last. */
for (i = 4; i < 4 * rounds; i++)
MIX_COLUMN (mtable, dst[i]);
}
......@@ -6,6 +6,7 @@
/* nettle, low-level cryptographics library
*
* Copyright (C) 2000, 2001, 2002 Rafael R. Sevilla, Niels Möller
* Copyright (C) 2013 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
......@@ -31,132 +32,12 @@
#include "aes-internal.h"
#include "macros.h"
/* NOTE: We don't include rotated versions of the table. */
static const uint32_t mtable[0x100] =
{
0x00000000,0x0b0d090e,0x161a121c,0x1d171b12,
0x2c342438,0x27392d36,0x3a2e3624,0x31233f2a,
0x58684870,0x5365417e,0x4e725a6c,0x457f5362,
0x745c6c48,0x7f516546,0x62467e54,0x694b775a,
0xb0d090e0,0xbbdd99ee,0xa6ca82fc,0xadc78bf2,
0x9ce4b4d8,0x97e9bdd6,0x8afea6c4,0x81f3afca,
0xe8b8d890,0xe3b5d19e,0xfea2ca8c,0xf5afc382,
0xc48cfca8,0xcf81f5a6,0xd296eeb4,0xd99be7ba,
0x7bbb3bdb,0x70b632d5,0x6da129c7,0x66ac20c9,
0x578f1fe3,0x5c8216ed,0x41950dff,0x4a9804f1,
0x23d373ab,0x28de7aa5,0x35c961b7,0x3ec468b9,
0x0fe75793,0x04ea5e9d,0x19fd458f,0x12f04c81,
0xcb6bab3b,0xc066a235,0xdd71b927,0xd67cb029,
0xe75f8f03,0xec52860d,0xf1459d1f,0xfa489411,
0x9303e34b,0x980eea45,0x8519f157,0x8e14f859,
0xbf37c773,0xb43ace7d,0xa92dd56f,0xa220dc61,
0xf66d76ad,0xfd607fa3,0xe07764b1,0xeb7a6dbf,
0xda595295,0xd1545b9b,0xcc434089,0xc74e4987,
0xae053edd,0xa50837d3,0xb81f2cc1,0xb31225cf,
0x82311ae5,0x893c13eb,0x942b08f9,0x9f2601f7,
0x46bde64d,0x4db0ef43,0x50a7f451,0x5baafd5f,
0x6a89c275,0x6184cb7b,0x7c93d069,0x779ed967,
0x1ed5ae3d,0x15d8a733,0x08cfbc21,0x03c2b52f,
0x32e18a05,0x39ec830b,0x24fb9819,0x2ff69117,
0x8dd64d76,0x86db4478,0x9bcc5f6a,0x90c15664,
0xa1e2694e,0xaaef6040,0xb7f87b52,0xbcf5725c,
0xd5be0506,0xdeb30c08,0xc3a4171a,0xc8a91e14,
0xf98a213e,0xf2872830,0xef903322,0xe49d3a2c,
0x3d06dd96,0x360bd498,0x2b1ccf8a,0x2011c684,
0x1132f9ae,0x1a3ff0a0,0x0728ebb2,0x0c25e2bc,
0x656e95e6,0x6e639ce8,0x737487fa,0x78798ef4,
0x495ab1de,0x4257b8d0,0x5f40a3c2,0x544daacc,
0xf7daec41,0xfcd7e54f,0xe1c0fe5d,0xeacdf753,
0xdbeec879,0xd0e3c177,0xcdf4da65,0xc6f9d36b,
0xafb2a431,0xa4bfad3f,0xb9a8b62d,0xb2a5bf23,
0x83868009,0x888b8907,0x959c9215,0x9e919b1b,
0x470a7ca1,0x4c0775af,0x51106ebd,0x5a1d67b3,
0x6b3e5899,0x60335197,0x7d244a85,0x7629438b,
0x1f6234d1,0x146f3ddf,0x097826cd,0x02752fc3,
0x335610e9,0x385b19e7,0x254c02f5,0x2e410bfb,
0x8c61d79a,0x876cde94,0x9a7bc586,0x9176cc88,
0xa055f3a2,0xab58faac,0xb64fe1be,0xbd42e8b0,
0xd4099fea,0xdf0496e4,0xc2138df6,0xc91e84f8,
0xf83dbbd2,0xf330b2dc,0xee27a9ce,0xe52aa0c0,
0x3cb1477a,0x37bc4e74,0x2aab5566,0x21a65c68,
0x10856342,0x1b886a4c,0x069f715e,0x0d927850,
0x64d90f0a,0x6fd40604,0x72c31d16,0x79ce1418,
0x48ed2b32,0x43e0223c,0x5ef7392e,0x55fa3020,
0x01b79aec,0x0aba93e2,0x17ad88f0,0x1ca081fe,
0x2d83bed4,0x268eb7da,0x3b99acc8,0x3094a5c6,
0x59dfd29c,0x52d2db92,0x4fc5c080,0x44c8c98e,
0x75ebf6a4,0x7ee6ffaa,0x63f1e4b8,0x68fcedb6,
0xb1670a0c,0xba6a0302,0xa77d1810,0xac70111e,
0x9d532e34,0x965e273a,0x8b493c28,0x80443526,
0xe90f427c,0xe2024b72,0xff155060,0xf418596e,
0xc53b6644,0xce366f4a,0xd3217458,0xd82c7d56,
0x7a0ca137,0x7101a839,0x6c16b32b,0x671bba25,
0x5638850f,0x5d358c01,0x40229713,0x4b2f9e1d,
0x2264e947,0x2969e049,0x347efb5b,0x3f73f255,
0x0e50cd7f,0x055dc471,0x184adf63,0x1347d66d,
0xcadc31d7,0xc1d138d9,0xdcc623cb,0xd7cb2ac5,
0xe6e815ef,0xede51ce1,0xf0f207f3,0xfbff0efd,
0x92b479a7,0x99b970a9,0x84ae6bbb,0x8fa362b5,
0xbe805d9f,0xb58d5491,0xa89a4f83,0xa397468d,
};
#define MIX_COLUMN(T, key) do { \
uint32_t _k, _nk, _t; \
_k = (key); \
_nk = T[_k & 0xff]; \
_k >>= 8; \
_t = T[_k & 0xff]; \
_nk ^= ROTL32(8, _t); \
_k >>= 8; \
_t = T[_k & 0xff]; \
_nk ^= ROTL32(16, _t); \
_k >>= 8; \
_t = T[_k & 0xff]; \
_nk ^= ROTL32(24, _t); \
(key) = _nk; \
} while(0)
#define SWAP(a, b) \
do { uint32_t t_swap = (a); (a) = (b); (b) = t_swap; } while(0)
void
aes_invert_key(struct aes_ctx *dst,
const struct aes_ctx *src)
{
unsigned rounds;
unsigned i;
rounds = src->rounds;
/* Reverse the order of subkeys, in groups of 4. */
/* FIXME: Instead of reordering the subkeys, change the access order
of aes_decrypt, since it's a separate function anyway? */
if (src == dst)
{
unsigned j, k;
for (i = 0, j = rounds * 4;
i < j;
i += 4, j -= 4)
for (k = 0; k<4; k++)
SWAP(dst->keys[i+k], dst->keys[j+k]);
}
else
{
unsigned k;
dst->rounds = rounds;
for (i = 0; i <= rounds * 4; i += 4)
for (k = 0; k < 4; k++)
dst->keys[i+k] = src->keys[rounds * 4 - i + k];
}
/* Transform all subkeys but the first and last. */
for (i = 4; i < 4 * rounds; i++)
MIX_COLUMN (mtable, dst->keys[i]);
_aes_invert (src->rounds, dst->keys, src->keys);
dst->rounds = src->rounds;
}
void
......
......@@ -6,6 +6,7 @@
/* nettle, low-level cryptographics library
*
* Copyright (C) 2000, 2001, 2002 Rafael R. Sevilla, Niels Möller
* Copyright (C) 2013 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
......@@ -32,50 +33,28 @@
#include <assert.h>
#include "aes-internal.h"
#include "macros.h"
void
aes_set_encrypt_key(struct aes_ctx *ctx,
size_t keysize, const uint8_t *key)
{
static const uint8_t rcon[10] = {
0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36,
};
unsigned nk, nr, i, lastkey;
uint32_t temp;
const uint8_t *rp;
unsigned nk, nr;
assert(keysize >= AES_MIN_KEY_SIZE);
assert(keysize <= AES_MAX_KEY_SIZE);
/* Truncate keysizes to the valid key sizes provided by Rijndael */
if (keysize == 32) {
if (keysize == AES256_KEY_SIZE) {
nk = 8;
nr = 14;
} else if (keysize >= 24) {
nr = _AES256_ROUNDS;
} else if (keysize >= AES192_KEY_SIZE) {
nk = 6;
nr = 12;
nr = _AES192_ROUNDS;
} else { /* must be 16 or more */
nk = 4;
nr = 10;
nr = _AES128_ROUNDS;
}
lastkey = (AES_BLOCK_SIZE/4) * (nr + 1);
ctx->rounds = nr;
for (i=0, rp = rcon; i<nk; i++)
ctx->keys[i] = LE_READ_UINT32(key + i*4);
for (i=nk; i<lastkey; i++)
{
temp = ctx->keys[i-1];
if (i % nk == 0)
temp = SUBBYTE(ROTL32(24, temp), aes_sbox) ^ *rp++;
else if (nk > 6 && (i%nk) == 4)
temp = SUBBYTE(temp, aes_sbox);
ctx->keys[i] = ctx->keys[i-nk] ^ temp;
}
_aes_set_key (nr, nk, ctx->keys, key);
}
/* aes-set-key-internal.c
*
* Key setup for the aes/rijndael block cipher.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2000, 2001, 2002 Rafael R. Sevilla, Niels Möller
* Copyright (C) 2013 Niels Möller
*
* The nettle library 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.
*
* The nettle library 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 the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
/* Originally written by Rafael R. Sevilla <dido@pacific.net.ph> */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "aes-internal.h"
#include "macros.h"
void
_aes_set_key(unsigned nr, unsigned nk,
uint32_t *subkeys, const uint8_t *key)
{
static const uint8_t rcon[10] = {
0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36,
};
const uint8_t *rp;
unsigned lastkey, i;
uint32_t t;
lastkey = (AES_BLOCK_SIZE/4) * (nr + 1);
for (i=0, rp = rcon; i<nk; i++)
subkeys[i] = LE_READ_UINT32(key + i*4);
for (i=nk; i<lastkey; i++)
{
t = subkeys[i-1];
if (i % nk == 0)
t = SUBBYTE(ROTL32(24, t), aes_sbox) ^ *rp++;
else if (nk > 6 && (i%nk) == 4)
t = SUBBYTE(t, aes_sbox);
subkeys[i] = subkeys[i-nk] ^ t;
}
}
......@@ -41,20 +41,24 @@ extern "C" {
#define AES_BLOCK_SIZE 16
#define AES128_KEY_SIZE 16
#define AES192_KEY_SIZE 24
#define AES256_KEY_SIZE 32
#define _AES128_ROUNDS 10
#define _AES192_ROUNDS 12
#define _AES256_ROUNDS 14
/* Variable key size between 128 and 256 bits. But the only valid
* values are 16 (128 bits), 24 (192 bits) and 32 (256 bits). */
#define AES_MIN_KEY_SIZE 16
#define AES_MAX_KEY_SIZE 32
#define AES_MIN_KEY_SIZE AES128_KEY_SIZE
#define AES_MAX_KEY_SIZE AES256_KEY_SIZE
#define AES_KEY_SIZE 32
/* FIXME: Change to put nrounds first, to make it possible to use a
truncated ctx struct, with less subkeys, for the shorter key
sizes? */
struct aes_ctx
{
unsigned rounds; /* number of rounds to use for our key size */
uint32_t keys[60]; /* maximum size of key schedule */
uint32_t keys[4*(_AES256_ROUNDS + 1)]; /* maximum size of key schedule */
};
void
......
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