151 lines
3.9 KiB
C
151 lines
3.9 KiB
C
/**
|
|
* AES routines supporting VMX instructions on the Power 8
|
|
*
|
|
* Copyright (C) 2015 International Business Machines Inc.
|
|
*
|
|
* 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 only.
|
|
*
|
|
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/err.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/hardirq.h>
|
|
#include <asm/switch_to.h>
|
|
#include <crypto/aes.h>
|
|
|
|
#include "aesp8-ppc.h"
|
|
|
|
struct p8_aes_ctx {
|
|
struct crypto_cipher *fallback;
|
|
struct aes_key enc_key;
|
|
struct aes_key dec_key;
|
|
};
|
|
|
|
static int p8_aes_init(struct crypto_tfm *tfm)
|
|
{
|
|
const char *alg;
|
|
struct crypto_cipher *fallback;
|
|
struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
if (!(alg = crypto_tfm_alg_name(tfm))) {
|
|
printk(KERN_ERR "Failed to get algorithm name.\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
fallback = crypto_alloc_cipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
|
|
if (IS_ERR(fallback)) {
|
|
printk(KERN_ERR
|
|
"Failed to allocate transformation for '%s': %ld\n",
|
|
alg, PTR_ERR(fallback));
|
|
return PTR_ERR(fallback);
|
|
}
|
|
printk(KERN_INFO "Using '%s' as fallback implementation.\n",
|
|
crypto_tfm_alg_driver_name((struct crypto_tfm *) fallback));
|
|
|
|
crypto_cipher_set_flags(fallback,
|
|
crypto_cipher_get_flags((struct
|
|
crypto_cipher *)
|
|
tfm));
|
|
ctx->fallback = fallback;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void p8_aes_exit(struct crypto_tfm *tfm)
|
|
{
|
|
struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
if (ctx->fallback) {
|
|
crypto_free_cipher(ctx->fallback);
|
|
ctx->fallback = NULL;
|
|
}
|
|
}
|
|
|
|
static int p8_aes_setkey(struct crypto_tfm *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
int ret;
|
|
struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
preempt_disable();
|
|
pagefault_disable();
|
|
enable_kernel_vsx();
|
|
ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
|
|
ret += aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
|
|
disable_kernel_vsx();
|
|
pagefault_enable();
|
|
preempt_enable();
|
|
|
|
ret += crypto_cipher_setkey(ctx->fallback, key, keylen);
|
|
return ret;
|
|
}
|
|
|
|
static void p8_aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
|
|
{
|
|
struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
if (in_interrupt()) {
|
|
crypto_cipher_encrypt_one(ctx->fallback, dst, src);
|
|
} else {
|
|
preempt_disable();
|
|
pagefault_disable();
|
|
enable_kernel_vsx();
|
|
aes_p8_encrypt(src, dst, &ctx->enc_key);
|
|
disable_kernel_vsx();
|
|
pagefault_enable();
|
|
preempt_enable();
|
|
}
|
|
}
|
|
|
|
static void p8_aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
|
|
{
|
|
struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
if (in_interrupt()) {
|
|
crypto_cipher_decrypt_one(ctx->fallback, dst, src);
|
|
} else {
|
|
preempt_disable();
|
|
pagefault_disable();
|
|
enable_kernel_vsx();
|
|
aes_p8_decrypt(src, dst, &ctx->dec_key);
|
|
disable_kernel_vsx();
|
|
pagefault_enable();
|
|
preempt_enable();
|
|
}
|
|
}
|
|
|
|
struct crypto_alg p8_aes_alg = {
|
|
.cra_name = "aes",
|
|
.cra_driver_name = "p8_aes",
|
|
.cra_module = THIS_MODULE,
|
|
.cra_priority = 1000,
|
|
.cra_type = NULL,
|
|
.cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK,
|
|
.cra_alignmask = 0,
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct p8_aes_ctx),
|
|
.cra_init = p8_aes_init,
|
|
.cra_exit = p8_aes_exit,
|
|
.cra_cipher = {
|
|
.cia_min_keysize = AES_MIN_KEY_SIZE,
|
|
.cia_max_keysize = AES_MAX_KEY_SIZE,
|
|
.cia_setkey = p8_aes_setkey,
|
|
.cia_encrypt = p8_aes_encrypt,
|
|
.cia_decrypt = p8_aes_decrypt,
|
|
},
|
|
};
|