diff options
Diffstat (limited to 'drivers/crypto/vmx/aes_xts.c')
| -rw-r--r-- | drivers/crypto/vmx/aes_xts.c | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/drivers/crypto/vmx/aes_xts.c b/drivers/crypto/vmx/aes_xts.c deleted file mode 100644 index dabbccb41..000000000 --- a/drivers/crypto/vmx/aes_xts.c +++ /dev/null @@ -1,162 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * AES XTS routines supporting VMX In-core instructions on Power 8 - * - * Copyright (C) 2015 International Business Machines Inc. - * - * Author: Leonidas S. Barbosa <leosilva@linux.vnet.ibm.com> - */ - -#include <asm/simd.h> -#include <asm/switch_to.h> -#include <crypto/aes.h> -#include <crypto/internal/simd.h> -#include <crypto/internal/skcipher.h> -#include <crypto/xts.h> - -#include "aesp8-ppc.h" - -struct p8_aes_xts_ctx { - struct crypto_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_skcipher *tfm) -{ - struct p8_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); - struct crypto_skcipher *fallback; - - fallback = crypto_alloc_skcipher("xts(aes)", 0, - CRYPTO_ALG_NEED_FALLBACK | - CRYPTO_ALG_ASYNC); - if (IS_ERR(fallback)) { - pr_err("Failed to allocate xts(aes) fallback: %ld\n", - PTR_ERR(fallback)); - return PTR_ERR(fallback); - } - - crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) + - crypto_skcipher_reqsize(fallback)); - ctx->fallback = fallback; - return 0; -} - -static void p8_aes_xts_exit(struct crypto_skcipher *tfm) -{ - struct p8_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); - - crypto_free_skcipher(ctx->fallback); -} - -static int p8_aes_xts_setkey(struct crypto_skcipher *tfm, const u8 *key, - unsigned int keylen) -{ - struct p8_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); - int ret; - - ret = xts_verify_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_skcipher_setkey(ctx->fallback, key, keylen); - - return ret ? -EINVAL : 0; -} - -static int p8_aes_xts_crypt(struct skcipher_request *req, int enc) -{ - struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); - const struct p8_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); - struct skcipher_walk walk; - unsigned int nbytes; - u8 tweak[AES_BLOCK_SIZE]; - int ret; - - if (req->cryptlen < AES_BLOCK_SIZE) - return -EINVAL; - - if (!crypto_simd_usable() || (req->cryptlen % XTS_BLOCK_SIZE) != 0) { - struct skcipher_request *subreq = skcipher_request_ctx(req); - - *subreq = *req; - skcipher_request_set_tfm(subreq, ctx->fallback); - return enc ? crypto_skcipher_encrypt(subreq) : - crypto_skcipher_decrypt(subreq); - } - - ret = skcipher_walk_virt(&walk, req, false); - if (ret) - return ret; - - preempt_disable(); - pagefault_disable(); - enable_kernel_vsx(); - - aes_p8_encrypt(walk.iv, tweak, &ctx->tweak_key); - - disable_kernel_vsx(); - pagefault_enable(); - preempt_enable(); - - while ((nbytes = walk.nbytes) != 0) { - preempt_disable(); - pagefault_disable(); - enable_kernel_vsx(); - if (enc) - aes_p8_xts_encrypt(walk.src.virt.addr, - walk.dst.virt.addr, - round_down(nbytes, AES_BLOCK_SIZE), - &ctx->enc_key, NULL, tweak); - else - aes_p8_xts_decrypt(walk.src.virt.addr, - walk.dst.virt.addr, - round_down(nbytes, AES_BLOCK_SIZE), - &ctx->dec_key, NULL, tweak); - disable_kernel_vsx(); - pagefault_enable(); - preempt_enable(); - - ret = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE); - } - return ret; -} - -static int p8_aes_xts_encrypt(struct skcipher_request *req) -{ - return p8_aes_xts_crypt(req, 1); -} - -static int p8_aes_xts_decrypt(struct skcipher_request *req) -{ - return p8_aes_xts_crypt(req, 0); -} - -struct skcipher_alg p8_aes_xts_alg = { - .base.cra_name = "xts(aes)", - .base.cra_driver_name = "p8_aes_xts", - .base.cra_module = THIS_MODULE, - .base.cra_priority = 2000, - .base.cra_flags = CRYPTO_ALG_NEED_FALLBACK, - .base.cra_blocksize = AES_BLOCK_SIZE, - .base.cra_ctxsize = sizeof(struct p8_aes_xts_ctx), - .setkey = p8_aes_xts_setkey, - .encrypt = p8_aes_xts_encrypt, - .decrypt = p8_aes_xts_decrypt, - .init = p8_aes_xts_init, - .exit = p8_aes_xts_exit, - .min_keysize = 2 * AES_MIN_KEY_SIZE, - .max_keysize = 2 * AES_MAX_KEY_SIZE, - .ivsize = AES_BLOCK_SIZE, -}; |