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/**
* 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);
pagefault_disable();
enable_kernel_altivec();
ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
ret += aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
pagefault_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 {
pagefault_disable();
enable_kernel_altivec();
aes_p8_encrypt(src, dst, &ctx->enc_key);
pagefault_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 {
pagefault_disable();
enable_kernel_altivec();
aes_p8_decrypt(src, dst, &ctx->dec_key);
pagefault_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,
},
};
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