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134 lines
3.2 KiB
134 lines
3.2 KiB
// 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 <[email protected]> |
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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/cipher.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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