2 * AES routines supporting VMX instructions on the Power 8
4 * Copyright (C) 2015 International Business Machines Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 only.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
22 #include <linux/types.h>
23 #include <linux/err.h>
24 #include <linux/crypto.h>
25 #include <linux/delay.h>
27 #include <asm/switch_to.h>
28 #include <crypto/aes.h>
29 #include <crypto/internal/simd.h>
31 #include "aesp8-ppc.h"
34 struct crypto_cipher *fallback;
35 struct aes_key enc_key;
36 struct aes_key dec_key;
39 static int p8_aes_init(struct crypto_tfm *tfm)
41 const char *alg = crypto_tfm_alg_name(tfm);
42 struct crypto_cipher *fallback;
43 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
45 fallback = crypto_alloc_cipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
46 if (IS_ERR(fallback)) {
48 "Failed to allocate transformation for '%s': %ld\n",
49 alg, PTR_ERR(fallback));
50 return PTR_ERR(fallback);
53 crypto_cipher_set_flags(fallback,
54 crypto_cipher_get_flags((struct
57 ctx->fallback = fallback;
62 static void p8_aes_exit(struct crypto_tfm *tfm)
64 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
67 crypto_free_cipher(ctx->fallback);
72 static int p8_aes_setkey(struct crypto_tfm *tfm, const u8 *key,
76 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
81 ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
82 ret |= aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
87 ret |= crypto_cipher_setkey(ctx->fallback, key, keylen);
89 return ret ? -EINVAL : 0;
92 static void p8_aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
94 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
96 if (!crypto_simd_usable()) {
97 crypto_cipher_encrypt_one(ctx->fallback, dst, src);
102 aes_p8_encrypt(src, dst, &ctx->enc_key);
103 disable_kernel_vsx();
109 static void p8_aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
111 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
113 if (!crypto_simd_usable()) {
114 crypto_cipher_decrypt_one(ctx->fallback, dst, src);
119 aes_p8_decrypt(src, dst, &ctx->dec_key);
120 disable_kernel_vsx();
126 struct crypto_alg p8_aes_alg = {
128 .cra_driver_name = "p8_aes",
129 .cra_module = THIS_MODULE,
130 .cra_priority = 1000,
132 .cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK,
134 .cra_blocksize = AES_BLOCK_SIZE,
135 .cra_ctxsize = sizeof(struct p8_aes_ctx),
136 .cra_init = p8_aes_init,
137 .cra_exit = p8_aes_exit,
139 .cia_min_keysize = AES_MIN_KEY_SIZE,
140 .cia_max_keysize = AES_MAX_KEY_SIZE,
141 .cia_setkey = p8_aes_setkey,
142 .cia_encrypt = p8_aes_encrypt,
143 .cia_decrypt = p8_aes_decrypt,