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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 15 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141902.274594435@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/**
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* AES routines supporting VMX instructions on the Power 8
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*
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* Copyright (C) 2015 International Business Machines Inc.
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*
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* Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/err.h>
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#include <linux/crypto.h>
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#include <linux/delay.h>
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#include <asm/simd.h>
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#include <asm/switch_to.h>
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#include <crypto/aes.h>
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#include <crypto/internal/simd.h>
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#include "aesp8-ppc.h"
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struct p8_aes_ctx {
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struct crypto_cipher *fallback;
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struct aes_key enc_key;
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struct aes_key dec_key;
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};
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static int p8_aes_init(struct crypto_tfm *tfm)
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{
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const char *alg = crypto_tfm_alg_name(tfm);
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struct crypto_cipher *fallback;
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struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
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fallback = crypto_alloc_cipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
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if (IS_ERR(fallback)) {
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printk(KERN_ERR
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"Failed to allocate transformation for '%s': %ld\n",
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alg, PTR_ERR(fallback));
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return PTR_ERR(fallback);
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}
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crypto_cipher_set_flags(fallback,
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crypto_cipher_get_flags((struct
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crypto_cipher *)
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tfm));
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ctx->fallback = fallback;
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return 0;
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}
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static void p8_aes_exit(struct crypto_tfm *tfm)
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{
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struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
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if (ctx->fallback) {
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crypto_free_cipher(ctx->fallback);
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ctx->fallback = NULL;
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}
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}
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static int p8_aes_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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int ret;
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struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
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preempt_disable();
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pagefault_disable();
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enable_kernel_vsx();
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ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
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ret |= aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
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disable_kernel_vsx();
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pagefault_enable();
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preempt_enable();
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ret |= crypto_cipher_setkey(ctx->fallback, key, keylen);
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return ret ? -EINVAL : 0;
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}
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static void p8_aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
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if (!crypto_simd_usable()) {
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crypto_cipher_encrypt_one(ctx->fallback, dst, src);
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} else {
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preempt_disable();
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pagefault_disable();
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enable_kernel_vsx();
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aes_p8_encrypt(src, dst, &ctx->enc_key);
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disable_kernel_vsx();
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pagefault_enable();
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preempt_enable();
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}
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}
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static void p8_aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
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if (!crypto_simd_usable()) {
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crypto_cipher_decrypt_one(ctx->fallback, dst, src);
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} else {
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preempt_disable();
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pagefault_disable();
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enable_kernel_vsx();
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aes_p8_decrypt(src, dst, &ctx->dec_key);
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disable_kernel_vsx();
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pagefault_enable();
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preempt_enable();
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}
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}
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struct crypto_alg p8_aes_alg = {
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.cra_name = "aes",
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.cra_driver_name = "p8_aes",
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.cra_module = THIS_MODULE,
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.cra_priority = 1000,
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.cra_type = NULL,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK,
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.cra_alignmask = 0,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct p8_aes_ctx),
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.cra_init = p8_aes_init,
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.cra_exit = p8_aes_exit,
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.cra_cipher = {
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.cia_min_keysize = AES_MIN_KEY_SIZE,
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.cia_max_keysize = AES_MAX_KEY_SIZE,
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.cia_setkey = p8_aes_setkey,
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.cia_encrypt = p8_aes_encrypt,
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.cia_decrypt = p8_aes_decrypt,
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},
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};
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