0eb76ba29d
The cipher routines in the crypto API are mostly intended for templates implementing skcipher modes generically in software, and shouldn't be used outside of the crypto subsystem. So move the prototypes and all related definitions to a new header file under include/crypto/internal. Also, let's use the new module namespace feature to move the symbol exports into a new namespace CRYPTO_INTERNAL. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
// 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 <mhcerri@br.ibm.com>
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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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