From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/crypto/vmx/aes_cbc.c | 133 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 133 insertions(+) create mode 100644 drivers/crypto/vmx/aes_cbc.c (limited to 'drivers/crypto/vmx/aes_cbc.c') diff --git a/drivers/crypto/vmx/aes_cbc.c b/drivers/crypto/vmx/aes_cbc.c new file mode 100644 index 000000000..ed0debc7a --- /dev/null +++ b/drivers/crypto/vmx/aes_cbc.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AES CBC routines supporting VMX instructions on the Power 8 + * + * Copyright (C) 2015 International Business Machines Inc. + * + * Author: Marcelo Henrique Cerri + */ + +#include +#include +#include +#include +#include + +#include "aesp8-ppc.h" + +struct p8_aes_cbc_ctx { + struct crypto_skcipher *fallback; + struct aes_key enc_key; + struct aes_key dec_key; +}; + +static int p8_aes_cbc_init(struct crypto_skcipher *tfm) +{ + struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); + struct crypto_skcipher *fallback; + + fallback = crypto_alloc_skcipher("cbc(aes)", 0, + CRYPTO_ALG_NEED_FALLBACK | + CRYPTO_ALG_ASYNC); + if (IS_ERR(fallback)) { + pr_err("Failed to allocate cbc(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_cbc_exit(struct crypto_skcipher *tfm) +{ + struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); + + crypto_free_skcipher(ctx->fallback); +} + +static int p8_aes_cbc_setkey(struct crypto_skcipher *tfm, const u8 *key, + unsigned int keylen) +{ + struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); + int ret; + + preempt_disable(); + pagefault_disable(); + enable_kernel_vsx(); + ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key); + ret |= aes_p8_set_decrypt_key(key, keylen * 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_cbc_crypt(struct skcipher_request *req, int enc) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + const struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); + struct skcipher_walk walk; + unsigned int nbytes; + int ret; + + if (!crypto_simd_usable()) { + 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); + while ((nbytes = walk.nbytes) != 0) { + preempt_disable(); + pagefault_disable(); + enable_kernel_vsx(); + aes_p8_cbc_encrypt(walk.src.virt.addr, + walk.dst.virt.addr, + round_down(nbytes, AES_BLOCK_SIZE), + enc ? &ctx->enc_key : &ctx->dec_key, + walk.iv, enc); + disable_kernel_vsx(); + pagefault_enable(); + preempt_enable(); + + ret = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE); + } + return ret; +} + +static int p8_aes_cbc_encrypt(struct skcipher_request *req) +{ + return p8_aes_cbc_crypt(req, 1); +} + +static int p8_aes_cbc_decrypt(struct skcipher_request *req) +{ + return p8_aes_cbc_crypt(req, 0); +} + +struct skcipher_alg p8_aes_cbc_alg = { + .base.cra_name = "cbc(aes)", + .base.cra_driver_name = "p8_aes_cbc", + .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_cbc_ctx), + .setkey = p8_aes_cbc_setkey, + .encrypt = p8_aes_cbc_encrypt, + .decrypt = p8_aes_cbc_decrypt, + .init = p8_aes_cbc_init, + .exit = p8_aes_cbc_exit, + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .ivsize = AES_BLOCK_SIZE, +}; -- cgit v1.2.3