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0b04990a5d
mirror_zfs/module/icp/asm-x86_64/aes/aeskey.c
Tom Caputi 0b04990a5d Illumos Crypto Port module added to enable native encryption in zfs 
A port of the Illumos Crypto Framework to a Linux kernel module (found
in module/icp). This is needed to do the actual encryption work. We cannot
use the Linux kernel's built in crypto api because it is only exported to
GPL-licensed modules. Having the ICP also means the crypto code can run on
any of the other kernels under OpenZFS. I ended up porting over most of the
internals of the framework, which means that porting over other API calls (if
we need them) should be fairly easy. Specifically, I have ported over the API
functions related to encryption, digests, macs, and crypto templates. The ICP
is able to use assembly-accelerated encryption on amd64 machines and AES-NI
instructions on Intel chips that support it. There are place-holder
directories for similar assembly optimizations for other architectures
(although they have not been written).

Signed-off-by: Tom Caputi <tcaputi@datto.com>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #4329
2016-07-20 10:43:30 -07:00

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/*
* ---------------------------------------------------------------------------
* Copyright (c) 1998-2007, Brian Gladman, Worcester, UK. All rights reserved.
*
* LICENSE TERMS
*
* The free distribution and use of this software is allowed (with or without
* changes) provided that:
*
* 1. source code distributions include the above copyright notice, this
* list of conditions and the following disclaimer;
*
* 2. binary distributions include the above copyright notice, this list
* of conditions and the following disclaimer in their documentation;
*
* 3. the name of the copyright holder is not used to endorse products
* built using this software without specific written permission.
*
* DISCLAIMER
*
* This software is provided 'as is' with no explicit or implied warranties
* in respect of its properties, including, but not limited to, correctness
* and/or fitness for purpose.
* ---------------------------------------------------------------------------
* Issue Date: 20/12/2007
*/
#include <aes/aes_impl.h>
#include "aesopt.h"
#include "aestab.h"
#include "aestab2.h"
/*
* Initialise the key schedule from the user supplied key. The key
* length can be specified in bytes, with legal values of 16, 24
* and 32, or in bits, with legal values of 128, 192 and 256. These
* values correspond with Nk values of 4, 6 and 8 respectively.
*
* The following macros implement a single cycle in the key
* schedule generation process. The number of cycles needed
* for each cx->n_col and nk value is:
*
* nk = 4 5 6 7 8
* ------------------------------
* cx->n_col = 4 10 9 8 7 7
* cx->n_col = 5 14 11 10 9 9
* cx->n_col = 6 19 15 12 11 11
* cx->n_col = 7 21 19 16 13 14
* cx->n_col = 8 29 23 19 17 14
*/
/*
* OpenSolaris changes
* 1. Added header files aes_impl.h and aestab2.h
* 2. Changed uint_8t and uint_32t to uint8_t and uint32_t
* 3. Remove code under ifdef USE_VIA_ACE_IF_PRESENT (always undefined)
* 4. Removed always-defined ifdefs FUNCS_IN_C, ENC_KEYING_IN_C,
* AES_128, AES_192, AES_256, AES_VAR defines
* 5. Changed aes_encrypt_key* aes_decrypt_key* functions to "static void"
* 6. Changed N_COLS to MAX_AES_NB
* 7. Replaced functions aes_encrypt_key and aes_decrypt_key with
* OpenSolaris-compatible functions rijndael_key_setup_enc_amd64 and
* rijndael_key_setup_dec_amd64
* 8. cstyled code and removed lint warnings
*/
#if defined(REDUCE_CODE_SIZE)
#define ls_box ls_sub
uint32_t ls_sub(const uint32_t t, const uint32_t n);
#define inv_mcol im_sub
uint32_t im_sub(const uint32_t x);
#ifdef ENC_KS_UNROLL
#undef ENC_KS_UNROLL
#endif
#ifdef DEC_KS_UNROLL
#undef DEC_KS_UNROLL
#endif
#endif /* REDUCE_CODE_SIZE */
#define ke4(k, i) \
{ k[4 * (i) + 4] = ss[0] ^= ls_box(ss[3], 3) ^ t_use(r, c)[i]; \
k[4 * (i) + 5] = ss[1] ^= ss[0]; \
k[4 * (i) + 6] = ss[2] ^= ss[1]; \
k[4 * (i) + 7] = ss[3] ^= ss[2]; \
}
static void
aes_encrypt_key128(const unsigned char *key, uint32_t rk[])
{
uint32_t ss[4];
rk[0] = ss[0] = word_in(key, 0);
rk[1] = ss[1] = word_in(key, 1);
rk[2] = ss[2] = word_in(key, 2);
rk[3] = ss[3] = word_in(key, 3);
#ifdef ENC_KS_UNROLL
ke4(rk, 0); ke4(rk, 1);
ke4(rk, 2); ke4(rk, 3);
ke4(rk, 4); ke4(rk, 5);
ke4(rk, 6); ke4(rk, 7);
ke4(rk, 8);
#else
{
uint32_t i;
for (i = 0; i < 9; ++i)
ke4(rk, i);
}
#endif /* ENC_KS_UNROLL */
ke4(rk, 9);
}
#define kef6(k, i) \
{ k[6 * (i) + 6] = ss[0] ^= ls_box(ss[5], 3) ^ t_use(r, c)[i]; \
k[6 * (i) + 7] = ss[1] ^= ss[0]; \
k[6 * (i) + 8] = ss[2] ^= ss[1]; \
k[6 * (i) + 9] = ss[3] ^= ss[2]; \
}
#define ke6(k, i) \
{ kef6(k, i); \
k[6 * (i) + 10] = ss[4] ^= ss[3]; \
k[6 * (i) + 11] = ss[5] ^= ss[4]; \
}
static void
aes_encrypt_key192(const unsigned char *key, uint32_t rk[])
{
uint32_t ss[6];
rk[0] = ss[0] = word_in(key, 0);
rk[1] = ss[1] = word_in(key, 1);
rk[2] = ss[2] = word_in(key, 2);
rk[3] = ss[3] = word_in(key, 3);
rk[4] = ss[4] = word_in(key, 4);
rk[5] = ss[5] = word_in(key, 5);
#ifdef ENC_KS_UNROLL
ke6(rk, 0); ke6(rk, 1);
ke6(rk, 2); ke6(rk, 3);
ke6(rk, 4); ke6(rk, 5);
ke6(rk, 6);
#else
{
uint32_t i;
for (i = 0; i < 7; ++i)
ke6(rk, i);
}
#endif /* ENC_KS_UNROLL */
kef6(rk, 7);
}
#define kef8(k, i) \
{ k[8 * (i) + 8] = ss[0] ^= ls_box(ss[7], 3) ^ t_use(r, c)[i]; \
k[8 * (i) + 9] = ss[1] ^= ss[0]; \
k[8 * (i) + 10] = ss[2] ^= ss[1]; \
k[8 * (i) + 11] = ss[3] ^= ss[2]; \
}
#define ke8(k, i) \
{ kef8(k, i); \
k[8 * (i) + 12] = ss[4] ^= ls_box(ss[3], 0); \
k[8 * (i) + 13] = ss[5] ^= ss[4]; \
k[8 * (i) + 14] = ss[6] ^= ss[5]; \
k[8 * (i) + 15] = ss[7] ^= ss[6]; \
}
static void
aes_encrypt_key256(const unsigned char *key, uint32_t rk[])
{
uint32_t ss[8];
rk[0] = ss[0] = word_in(key, 0);
rk[1] = ss[1] = word_in(key, 1);
rk[2] = ss[2] = word_in(key, 2);
rk[3] = ss[3] = word_in(key, 3);
rk[4] = ss[4] = word_in(key, 4);
rk[5] = ss[5] = word_in(key, 5);
rk[6] = ss[6] = word_in(key, 6);
rk[7] = ss[7] = word_in(key, 7);
#ifdef ENC_KS_UNROLL
ke8(rk, 0); ke8(rk, 1);
ke8(rk, 2); ke8(rk, 3);
ke8(rk, 4); ke8(rk, 5);
#else
{
uint32_t i;
for (i = 0; i < 6; ++i)
ke8(rk, i);
}
#endif /* ENC_KS_UNROLL */
kef8(rk, 6);
}
/*
* Expand the cipher key into the encryption key schedule.
*
* Return the number of rounds for the given cipher key size.
* The size of the key schedule depends on the number of rounds
* (which can be computed from the size of the key), i.e. 4 * (Nr + 1).
*
* Parameters:
* rk AES key schedule 32-bit array to be initialized
* cipherKey User key
* keyBits AES key size (128, 192, or 256 bits)
*/
int
rijndael_key_setup_enc_amd64(uint32_t rk[], const uint32_t cipherKey[],
int keyBits)
{
switch (keyBits) {
case 128:
aes_encrypt_key128((unsigned char *)&cipherKey[0], rk);
return (10);
case 192:
aes_encrypt_key192((unsigned char *)&cipherKey[0], rk);
return (12);
case 256:
aes_encrypt_key256((unsigned char *)&cipherKey[0], rk);
return (14);
default: /* should never get here */
break;
}
return (0);
}
/* this is used to store the decryption round keys */
/* in forward or reverse order */
#ifdef AES_REV_DKS
#define v(n, i) ((n) - (i) + 2 * ((i) & 3))
#else
#define v(n, i) (i)
#endif
#if DEC_ROUND == NO_TABLES
#define ff(x) (x)
#else
#define ff(x) inv_mcol(x)
#if defined(dec_imvars)
#define d_vars dec_imvars
#endif
#endif /* FUNCS_IN_C & DEC_KEYING_IN_C */
#define k4e(k, i) \
{ k[v(40, (4 * (i)) + 4)] = ss[0] ^= ls_box(ss[3], 3) ^ t_use(r, c)[i]; \
k[v(40, (4 * (i)) + 5)] = ss[1] ^= ss[0]; \
k[v(40, (4 * (i)) + 6)] = ss[2] ^= ss[1]; \
k[v(40, (4 * (i)) + 7)] = ss[3] ^= ss[2]; \
}
#if 1
#define kdf4(k, i) \
{ ss[0] = ss[0] ^ ss[2] ^ ss[1] ^ ss[3]; \
ss[1] = ss[1] ^ ss[3]; \
ss[2] = ss[2] ^ ss[3]; \
ss[4] = ls_box(ss[(i + 3) % 4], 3) ^ t_use(r, c)[i]; \
ss[i % 4] ^= ss[4]; \
ss[4] ^= k[v(40, (4 * (i)))]; k[v(40, (4 * (i)) + 4)] = ff(ss[4]); \
ss[4] ^= k[v(40, (4 * (i)) + 1)]; k[v(40, (4 * (i)) + 5)] = ff(ss[4]); \
ss[4] ^= k[v(40, (4 * (i)) + 2)]; k[v(40, (4 * (i)) + 6)] = ff(ss[4]); \
ss[4] ^= k[v(40, (4 * (i)) + 3)]; k[v(40, (4 * (i)) + 7)] = ff(ss[4]); \
}
#define kd4(k, i) \
{ ss[4] = ls_box(ss[(i + 3) % 4], 3) ^ t_use(r, c)[i]; \
ss[i % 4] ^= ss[4]; ss[4] = ff(ss[4]); \
k[v(40, (4 * (i)) + 4)] = ss[4] ^= k[v(40, (4 * (i)))]; \
k[v(40, (4 * (i)) + 5)] = ss[4] ^= k[v(40, (4 * (i)) + 1)]; \
k[v(40, (4 * (i)) + 6)] = ss[4] ^= k[v(40, (4 * (i)) + 2)]; \
k[v(40, (4 * (i)) + 7)] = ss[4] ^= k[v(40, (4 * (i)) + 3)]; \
}
#define kdl4(k, i) \
{ ss[4] = ls_box(ss[(i + 3) % 4], 3) ^ t_use(r, c)[i]; \
ss[i % 4] ^= ss[4]; \
k[v(40, (4 * (i)) + 4)] = (ss[0] ^= ss[1]) ^ ss[2] ^ ss[3]; \
k[v(40, (4 * (i)) + 5)] = ss[1] ^ ss[3]; \
k[v(40, (4 * (i)) + 6)] = ss[0]; \
k[v(40, (4 * (i)) + 7)] = ss[1]; \
}
#else
#define kdf4(k, i) \
{ ss[0] ^= ls_box(ss[3], 3) ^ t_use(r, c)[i]; \
k[v(40, (4 * (i)) + 4)] = ff(ss[0]); \
ss[1] ^= ss[0]; k[v(40, (4 * (i)) + 5)] = ff(ss[1]); \
ss[2] ^= ss[1]; k[v(40, (4 * (i)) + 6)] = ff(ss[2]); \
ss[3] ^= ss[2]; k[v(40, (4 * (i)) + 7)] = ff(ss[3]); \
}
#define kd4(k, i) \
{ ss[4] = ls_box(ss[3], 3) ^ t_use(r, c)[i]; \
ss[0] ^= ss[4]; \
ss[4] = ff(ss[4]); \
k[v(40, (4 * (i)) + 4)] = ss[4] ^= k[v(40, (4 * (i)))]; \
ss[1] ^= ss[0]; \
k[v(40, (4 * (i)) + 5)] = ss[4] ^= k[v(40, (4 * (i)) + 1)]; \
ss[2] ^= ss[1]; \
k[v(40, (4 * (i)) + 6)] = ss[4] ^= k[v(40, (4 * (i)) + 2)]; \
ss[3] ^= ss[2]; \
k[v(40, (4 * (i)) + 7)] = ss[4] ^= k[v(40, (4 * (i)) + 3)]; \
}
#define kdl4(k, i) \
{ ss[0] ^= ls_box(ss[3], 3) ^ t_use(r, c)[i]; \
k[v(40, (4 * (i)) + 4)] = ss[0]; \
ss[1] ^= ss[0]; k[v(40, (4 * (i)) + 5)] = ss[1]; \
ss[2] ^= ss[1]; k[v(40, (4 * (i)) + 6)] = ss[2]; \
ss[3] ^= ss[2]; k[v(40, (4 * (i)) + 7)] = ss[3]; \
}
#endif
static void
aes_decrypt_key128(const unsigned char *key, uint32_t rk[])
{
uint32_t ss[5];
#if defined(d_vars)
d_vars;
#endif
rk[v(40, (0))] = ss[0] = word_in(key, 0);
rk[v(40, (1))] = ss[1] = word_in(key, 1);
rk[v(40, (2))] = ss[2] = word_in(key, 2);
rk[v(40, (3))] = ss[3] = word_in(key, 3);
#ifdef DEC_KS_UNROLL
kdf4(rk, 0); kd4(rk, 1);
kd4(rk, 2); kd4(rk, 3);
kd4(rk, 4); kd4(rk, 5);
kd4(rk, 6); kd4(rk, 7);
kd4(rk, 8); kdl4(rk, 9);
#else
{
uint32_t i;
for (i = 0; i < 10; ++i)
k4e(rk, i);
#if !(DEC_ROUND == NO_TABLES)
for (i = MAX_AES_NB; i < 10 * MAX_AES_NB; ++i)
rk[i] = inv_mcol(rk[i]);
#endif
}
#endif /* DEC_KS_UNROLL */
}
#define k6ef(k, i) \
{ k[v(48, (6 * (i)) + 6)] = ss[0] ^= ls_box(ss[5], 3) ^ t_use(r, c)[i]; \
k[v(48, (6 * (i)) + 7)] = ss[1] ^= ss[0]; \
k[v(48, (6 * (i)) + 8)] = ss[2] ^= ss[1]; \
k[v(48, (6 * (i)) + 9)] = ss[3] ^= ss[2]; \
}
#define k6e(k, i) \
{ k6ef(k, i); \
k[v(48, (6 * (i)) + 10)] = ss[4] ^= ss[3]; \
k[v(48, (6 * (i)) + 11)] = ss[5] ^= ss[4]; \
}
#define kdf6(k, i) \
{ ss[0] ^= ls_box(ss[5], 3) ^ t_use(r, c)[i]; \
k[v(48, (6 * (i)) + 6)] = ff(ss[0]); \
ss[1] ^= ss[0]; k[v(48, (6 * (i)) + 7)] = ff(ss[1]); \
ss[2] ^= ss[1]; k[v(48, (6 * (i)) + 8)] = ff(ss[2]); \
ss[3] ^= ss[2]; k[v(48, (6 * (i)) + 9)] = ff(ss[3]); \
ss[4] ^= ss[3]; k[v(48, (6 * (i)) + 10)] = ff(ss[4]); \
ss[5] ^= ss[4]; k[v(48, (6 * (i)) + 11)] = ff(ss[5]); \
}
#define kd6(k, i) \
{ ss[6] = ls_box(ss[5], 3) ^ t_use(r, c)[i]; \
ss[0] ^= ss[6]; ss[6] = ff(ss[6]); \
k[v(48, (6 * (i)) + 6)] = ss[6] ^= k[v(48, (6 * (i)))]; \
ss[1] ^= ss[0]; \
k[v(48, (6 * (i)) + 7)] = ss[6] ^= k[v(48, (6 * (i)) + 1)]; \
ss[2] ^= ss[1]; \
k[v(48, (6 * (i)) + 8)] = ss[6] ^= k[v(48, (6 * (i)) + 2)]; \
ss[3] ^= ss[2]; \
k[v(48, (6 * (i)) + 9)] = ss[6] ^= k[v(48, (6 * (i)) + 3)]; \
ss[4] ^= ss[3]; \
k[v(48, (6 * (i)) + 10)] = ss[6] ^= k[v(48, (6 * (i)) + 4)]; \
ss[5] ^= ss[4]; \
k[v(48, (6 * (i)) + 11)] = ss[6] ^= k[v(48, (6 * (i)) + 5)]; \
}
#define kdl6(k, i) \
{ ss[0] ^= ls_box(ss[5], 3) ^ t_use(r, c)[i]; \
k[v(48, (6 * (i)) + 6)] = ss[0]; \
ss[1] ^= ss[0]; k[v(48, (6 * (i)) + 7)] = ss[1]; \
ss[2] ^= ss[1]; k[v(48, (6 * (i)) + 8)] = ss[2]; \
ss[3] ^= ss[2]; k[v(48, (6 * (i)) + 9)] = ss[3]; \
}
static void
aes_decrypt_key192(const unsigned char *key, uint32_t rk[])
{
uint32_t ss[7];
#if defined(d_vars)
d_vars;
#endif
rk[v(48, (0))] = ss[0] = word_in(key, 0);
rk[v(48, (1))] = ss[1] = word_in(key, 1);
rk[v(48, (2))] = ss[2] = word_in(key, 2);
rk[v(48, (3))] = ss[3] = word_in(key, 3);
#ifdef DEC_KS_UNROLL
ss[4] = word_in(key, 4);
rk[v(48, (4))] = ff(ss[4]);
ss[5] = word_in(key, 5);
rk[v(48, (5))] = ff(ss[5]);
kdf6(rk, 0); kd6(rk, 1);
kd6(rk, 2); kd6(rk, 3);
kd6(rk, 4); kd6(rk, 5);
kd6(rk, 6); kdl6(rk, 7);
#else
rk[v(48, (4))] = ss[4] = word_in(key, 4);
rk[v(48, (5))] = ss[5] = word_in(key, 5);
{
uint32_t i;
for (i = 0; i < 7; ++i)
k6e(rk, i);
k6ef(rk, 7);
#if !(DEC_ROUND == NO_TABLES)
for (i = MAX_AES_NB; i < 12 * MAX_AES_NB; ++i)
rk[i] = inv_mcol(rk[i]);
#endif
}
#endif
}
#define k8ef(k, i) \
{ k[v(56, (8 * (i)) + 8)] = ss[0] ^= ls_box(ss[7], 3) ^ t_use(r, c)[i]; \
k[v(56, (8 * (i)) + 9)] = ss[1] ^= ss[0]; \
k[v(56, (8 * (i)) + 10)] = ss[2] ^= ss[1]; \
k[v(56, (8 * (i)) + 11)] = ss[3] ^= ss[2]; \
}
#define k8e(k, i) \
{ k8ef(k, i); \
k[v(56, (8 * (i)) + 12)] = ss[4] ^= ls_box(ss[3], 0); \
k[v(56, (8 * (i)) + 13)] = ss[5] ^= ss[4]; \
k[v(56, (8 * (i)) + 14)] = ss[6] ^= ss[5]; \
k[v(56, (8 * (i)) + 15)] = ss[7] ^= ss[6]; \
}
#define kdf8(k, i) \
{ ss[0] ^= ls_box(ss[7], 3) ^ t_use(r, c)[i]; \
k[v(56, (8 * (i)) + 8)] = ff(ss[0]); \
ss[1] ^= ss[0]; k[v(56, (8 * (i)) + 9)] = ff(ss[1]); \
ss[2] ^= ss[1]; k[v(56, (8 * (i)) + 10)] = ff(ss[2]); \
ss[3] ^= ss[2]; k[v(56, (8 * (i)) + 11)] = ff(ss[3]); \
ss[4] ^= ls_box(ss[3], 0); k[v(56, (8 * (i)) + 12)] = ff(ss[4]); \
ss[5] ^= ss[4]; k[v(56, (8 * (i)) + 13)] = ff(ss[5]); \
ss[6] ^= ss[5]; k[v(56, (8 * (i)) + 14)] = ff(ss[6]); \
ss[7] ^= ss[6]; k[v(56, (8 * (i)) + 15)] = ff(ss[7]); \
}
#define kd8(k, i) \
{ ss[8] = ls_box(ss[7], 3) ^ t_use(r, c)[i]; \
ss[0] ^= ss[8]; \
ss[8] = ff(ss[8]); \
k[v(56, (8 * (i)) + 8)] = ss[8] ^= k[v(56, (8 * (i)))]; \
ss[1] ^= ss[0]; \
k[v(56, (8 * (i)) + 9)] = ss[8] ^= k[v(56, (8 * (i)) + 1)]; \
ss[2] ^= ss[1]; \
k[v(56, (8 * (i)) + 10)] = ss[8] ^= k[v(56, (8 * (i)) + 2)]; \
ss[3] ^= ss[2]; \
k[v(56, (8 * (i)) + 11)] = ss[8] ^= k[v(56, (8 * (i)) + 3)]; \
ss[8] = ls_box(ss[3], 0); \
ss[4] ^= ss[8]; \
ss[8] = ff(ss[8]); \
k[v(56, (8 * (i)) + 12)] = ss[8] ^= k[v(56, (8 * (i)) + 4)]; \
ss[5] ^= ss[4]; \
k[v(56, (8 * (i)) + 13)] = ss[8] ^= k[v(56, (8 * (i)) + 5)]; \
ss[6] ^= ss[5]; \
k[v(56, (8 * (i)) + 14)] = ss[8] ^= k[v(56, (8 * (i)) + 6)]; \
ss[7] ^= ss[6]; \
k[v(56, (8 * (i)) + 15)] = ss[8] ^= k[v(56, (8 * (i)) + 7)]; \
}
#define kdl8(k, i) \
{ ss[0] ^= ls_box(ss[7], 3) ^ t_use(r, c)[i]; \
k[v(56, (8 * (i)) + 8)] = ss[0]; \
ss[1] ^= ss[0]; k[v(56, (8 * (i)) + 9)] = ss[1]; \
ss[2] ^= ss[1]; k[v(56, (8 * (i)) + 10)] = ss[2]; \
ss[3] ^= ss[2]; k[v(56, (8 * (i)) + 11)] = ss[3]; \
}
static void
aes_decrypt_key256(const unsigned char *key, uint32_t rk[])
{
uint32_t ss[9];
#if defined(d_vars)
d_vars;
#endif
rk[v(56, (0))] = ss[0] = word_in(key, 0);
rk[v(56, (1))] = ss[1] = word_in(key, 1);
rk[v(56, (2))] = ss[2] = word_in(key, 2);
rk[v(56, (3))] = ss[3] = word_in(key, 3);
#ifdef DEC_KS_UNROLL
ss[4] = word_in(key, 4);
rk[v(56, (4))] = ff(ss[4]);
ss[5] = word_in(key, 5);
rk[v(56, (5))] = ff(ss[5]);
ss[6] = word_in(key, 6);
rk[v(56, (6))] = ff(ss[6]);
ss[7] = word_in(key, 7);
rk[v(56, (7))] = ff(ss[7]);
kdf8(rk, 0); kd8(rk, 1);
kd8(rk, 2); kd8(rk, 3);
kd8(rk, 4); kd8(rk, 5);
kdl8(rk, 6);
#else
rk[v(56, (4))] = ss[4] = word_in(key, 4);
rk[v(56, (5))] = ss[5] = word_in(key, 5);
rk[v(56, (6))] = ss[6] = word_in(key, 6);
rk[v(56, (7))] = ss[7] = word_in(key, 7);
{
uint32_t i;
for (i = 0; i < 6; ++i)
k8e(rk, i);
k8ef(rk, 6);
#if !(DEC_ROUND == NO_TABLES)
for (i = MAX_AES_NB; i < 14 * MAX_AES_NB; ++i)
rk[i] = inv_mcol(rk[i]);
#endif
}
#endif /* DEC_KS_UNROLL */
}
/*
* Expand the cipher key into the decryption key schedule.
*
* Return the number of rounds for the given cipher key size.
* The size of the key schedule depends on the number of rounds
* (which can be computed from the size of the key), i.e. 4 * (Nr + 1).
*
* Parameters:
* rk AES key schedule 32-bit array to be initialized
* cipherKey User key
* keyBits AES key size (128, 192, or 256 bits)
*/
int
rijndael_key_setup_dec_amd64(uint32_t rk[], const uint32_t cipherKey[],
int keyBits)
{
switch (keyBits) {
case 128:
aes_decrypt_key128((unsigned char *)&cipherKey[0], rk);
return (10);
case 192:
aes_decrypt_key192((unsigned char *)&cipherKey[0], rk);
return (12);
case 256:
aes_decrypt_key256((unsigned char *)&cipherKey[0], rk);
return (14);
default: /* should never get here */
break;
}
return (0);
}
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