// SPDX-License-Identifier: GPL-2.0-only /* * AES routines supporting VMX instructions on the Power 8 * * Copyright (C) 2015 International Business Machines Inc. * * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com> */ #include <linux/types.h> #include <linux/err.h> #include <linux/crypto.h> #include <linux/delay.h> #include <asm/simd.h> #include <asm/switch_to.h> #include <crypto/aes.h> #include <crypto/internal/cipher.h> #include <crypto/internal/simd.h> #include "aesp8-ppc.h" struct p8_aes_ctx { struct crypto_cipher *fallback; struct aes_key enc_key; struct aes_key dec_key; }; static int p8_aes_init(struct crypto_tfm *tfm) { const char *alg = crypto_tfm_alg_name(tfm); struct crypto_cipher *fallback; struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm); fallback = crypto_alloc_cipher(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_cipher_set_flags(fallback, crypto_cipher_get_flags((struct crypto_cipher *) tfm)); ctx->fallback = fallback; return 0; } static void p8_aes_exit(struct crypto_tfm *tfm) { struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm); if (ctx->fallback) { crypto_free_cipher(ctx->fallback); ctx->fallback = NULL; } } static int p8_aes_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) { int ret; struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm); 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_cipher_setkey(ctx->fallback, key, keylen); return ret ? -EINVAL : 0; } static void p8_aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm); if (!crypto_simd_usable()) { crypto_cipher_encrypt_one(ctx->fallback, dst, src); } else { preempt_disable(); pagefault_disable(); enable_kernel_vsx(); aes_p8_encrypt(src, dst, &ctx->enc_key); disable_kernel_vsx(); pagefault_enable(); preempt_enable(); } } static void p8_aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm); if (!crypto_simd_usable()) { crypto_cipher_decrypt_one(ctx->fallback, dst, src); } else { preempt_disable(); pagefault_disable(); enable_kernel_vsx(); aes_p8_decrypt(src, dst, &ctx->dec_key); disable_kernel_vsx(); pagefault_enable(); preempt_enable(); } } struct crypto_alg p8_aes_alg = { .cra_name = "aes", .cra_driver_name = "p8_aes", .cra_module = THIS_MODULE, .cra_priority = 1000, .cra_type = NULL, .cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK, .cra_alignmask = 0, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct p8_aes_ctx), .cra_init = p8_aes_init, .cra_exit = p8_aes_exit, .cra_cipher = { .cia_min_keysize = AES_MIN_KEY_SIZE, .cia_max_keysize = AES_MAX_KEY_SIZE, .cia_setkey = p8_aes_setkey, .cia_encrypt = p8_aes_encrypt, .cia_decrypt = p8_aes_decrypt, }, };