1 // SPDX-License-Identifier: GPL-2.0-only
3 * AES routines supporting VMX instructions on the Power 8
5 * Copyright (C) 2015 International Business Machines Inc.
7 * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
10 #include <linux/types.h>
11 #include <linux/err.h>
12 #include <linux/crypto.h>
13 #include <linux/delay.h>
15 #include <asm/switch_to.h>
16 #include <crypto/aes.h>
17 #include <crypto/internal/simd.h>
19 #include "aesp8-ppc.h"
22 struct crypto_cipher *fallback;
23 struct aes_key enc_key;
24 struct aes_key dec_key;
27 static int p8_aes_init(struct crypto_tfm *tfm)
29 const char *alg = crypto_tfm_alg_name(tfm);
30 struct crypto_cipher *fallback;
31 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
33 fallback = crypto_alloc_cipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
34 if (IS_ERR(fallback)) {
36 "Failed to allocate transformation for '%s': %ld\n",
37 alg, PTR_ERR(fallback));
38 return PTR_ERR(fallback);
41 crypto_cipher_set_flags(fallback,
42 crypto_cipher_get_flags((struct
45 ctx->fallback = fallback;
50 static void p8_aes_exit(struct crypto_tfm *tfm)
52 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
55 crypto_free_cipher(ctx->fallback);
60 static int p8_aes_setkey(struct crypto_tfm *tfm, const u8 *key,
64 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
69 ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
70 ret |= aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
75 ret |= crypto_cipher_setkey(ctx->fallback, key, keylen);
77 return ret ? -EINVAL : 0;
80 static void p8_aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
82 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
84 if (!crypto_simd_usable()) {
85 crypto_cipher_encrypt_one(ctx->fallback, dst, src);
90 aes_p8_encrypt(src, dst, &ctx->enc_key);
97 static void p8_aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
99 struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
101 if (!crypto_simd_usable()) {
102 crypto_cipher_decrypt_one(ctx->fallback, dst, src);
107 aes_p8_decrypt(src, dst, &ctx->dec_key);
108 disable_kernel_vsx();
114 struct crypto_alg p8_aes_alg = {
116 .cra_driver_name = "p8_aes",
117 .cra_module = THIS_MODULE,
118 .cra_priority = 1000,
120 .cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK,
122 .cra_blocksize = AES_BLOCK_SIZE,
123 .cra_ctxsize = sizeof(struct p8_aes_ctx),
124 .cra_init = p8_aes_init,
125 .cra_exit = p8_aes_exit,
127 .cia_min_keysize = AES_MIN_KEY_SIZE,
128 .cia_max_keysize = AES_MAX_KEY_SIZE,
129 .cia_setkey = p8_aes_setkey,
130 .cia_encrypt = p8_aes_encrypt,
131 .cia_decrypt = p8_aes_decrypt,