diff options
Diffstat (limited to 'drivers/crypto/vmx/aes_xts.c')
| -rw-r--r-- | drivers/crypto/vmx/aes_xts.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/drivers/crypto/vmx/aes_xts.c b/drivers/crypto/vmx/aes_xts.c deleted file mode 100644 index ecd64e5cc5bb..000000000000 --- a/drivers/crypto/vmx/aes_xts.c +++ /dev/null @@ -1,190 +0,0 @@ -/** - * AES XTS routines supporting VMX In-core instructions on 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 Foundations; 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 of FITNESS FOR A PARTICUPAR 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: Leonidas S. Barbosa <leosilva@linux.vnet.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 <crypto/scatterwalk.h> -#include <crypto/xts.h> -#include <crypto/skcipher.h> - -#include "aesp8-ppc.h" - -struct p8_aes_xts_ctx { - struct crypto_sync_skcipher *fallback; - struct aes_key enc_key; - struct aes_key dec_key; - struct aes_key tweak_key; -}; - -static int p8_aes_xts_init(struct crypto_tfm *tfm) -{ - const char *alg = crypto_tfm_alg_name(tfm); - struct crypto_sync_skcipher *fallback; - struct p8_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm); - - fallback = crypto_alloc_sync_skcipher(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); - } - - crypto_sync_skcipher_set_flags( - fallback, - crypto_skcipher_get_flags((struct crypto_skcipher *)tfm)); - ctx->fallback = fallback; - - return 0; -} - -static void p8_aes_xts_exit(struct crypto_tfm *tfm) -{ - struct p8_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm); - - if (ctx->fallback) { - crypto_free_sync_skcipher(ctx->fallback); - ctx->fallback = NULL; - } -} - -static int p8_aes_xts_setkey(struct crypto_tfm *tfm, const u8 *key, - unsigned int keylen) -{ - int ret; - struct p8_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm); - - ret = xts_check_key(tfm, key, keylen); - if (ret) - return ret; - - preempt_disable(); - pagefault_disable(); - enable_kernel_vsx(); - ret = aes_p8_set_encrypt_key(key + keylen/2, (keylen/2) * 8, &ctx->tweak_key); - ret += aes_p8_set_encrypt_key(key, (keylen/2) * 8, &ctx->enc_key); - ret += aes_p8_set_decrypt_key(key, (keylen/2) * 8, &ctx->dec_key); - disable_kernel_vsx(); - pagefault_enable(); - preempt_enable(); - - ret += crypto_sync_skcipher_setkey(ctx->fallback, key, keylen); - return ret; -} - -static int p8_aes_xts_crypt(struct blkcipher_desc *desc, - struct scatterlist *dst, - struct scatterlist *src, - unsigned int nbytes, int enc) -{ - int ret; - u8 tweak[AES_BLOCK_SIZE]; - u8 *iv; - struct blkcipher_walk walk; - struct p8_aes_xts_ctx *ctx = - crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm)); - - if (in_interrupt()) { - SYNC_SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback); - skcipher_request_set_sync_tfm(req, ctx->fallback); - skcipher_request_set_callback(req, desc->flags, NULL, NULL); - skcipher_request_set_crypt(req, src, dst, nbytes, desc->info); - ret = enc? crypto_skcipher_encrypt(req) : crypto_skcipher_decrypt(req); - skcipher_request_zero(req); - } else { - blkcipher_walk_init(&walk, dst, src, nbytes); - - ret = blkcipher_walk_virt(desc, &walk); - - preempt_disable(); - pagefault_disable(); - enable_kernel_vsx(); - - iv = walk.iv; - memset(tweak, 0, AES_BLOCK_SIZE); - aes_p8_encrypt(iv, tweak, &ctx->tweak_key); - - disable_kernel_vsx(); - pagefault_enable(); - preempt_enable(); - - while ((nbytes = walk.nbytes)) { - preempt_disable(); - pagefault_disable(); - enable_kernel_vsx(); - if (enc) - aes_p8_xts_encrypt(walk.src.virt.addr, walk.dst.virt.addr, - nbytes & AES_BLOCK_MASK, &ctx->enc_key, NULL, tweak); - else - aes_p8_xts_decrypt(walk.src.virt.addr, walk.dst.virt.addr, - nbytes & AES_BLOCK_MASK, &ctx->dec_key, NULL, tweak); - disable_kernel_vsx(); - pagefault_enable(); - preempt_enable(); - - nbytes &= AES_BLOCK_SIZE - 1; - ret = blkcipher_walk_done(desc, &walk, nbytes); - } - } - return ret; -} - -static int p8_aes_xts_encrypt(struct blkcipher_desc *desc, - struct scatterlist *dst, - struct scatterlist *src, unsigned int nbytes) -{ - return p8_aes_xts_crypt(desc, dst, src, nbytes, 1); -} - -static int p8_aes_xts_decrypt(struct blkcipher_desc *desc, - struct scatterlist *dst, - struct scatterlist *src, unsigned int nbytes) -{ - return p8_aes_xts_crypt(desc, dst, src, nbytes, 0); -} - -struct crypto_alg p8_aes_xts_alg = { - .cra_name = "xts(aes)", - .cra_driver_name = "p8_aes_xts", - .cra_module = THIS_MODULE, - .cra_priority = 2000, - .cra_type = &crypto_blkcipher_type, - .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK, - .cra_alignmask = 0, - .cra_blocksize = AES_BLOCK_SIZE, - .cra_ctxsize = sizeof(struct p8_aes_xts_ctx), - .cra_init = p8_aes_xts_init, - .cra_exit = p8_aes_xts_exit, - .cra_blkcipher = { - .ivsize = AES_BLOCK_SIZE, - .min_keysize = 2 * AES_MIN_KEY_SIZE, - .max_keysize = 2 * AES_MAX_KEY_SIZE, - .setkey = p8_aes_xts_setkey, - .encrypt = p8_aes_xts_encrypt, - .decrypt = p8_aes_xts_decrypt, - } -}; |