LXR linux/arch/arm64/crypto/aes-cipher-glue.c

   1/*
   2 * Scalar AES core transform
   3 *
   4 * Copyright (C) 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#include <crypto/aes.h>
  12#include <linux/crypto.h>
  13#include <linux/module.h>
  14
  15asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
  16EXPORT_SYMBOL(__aes_arm64_encrypt);
  17
  18asmlinkage void __aes_arm64_decrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
  19EXPORT_SYMBOL(__aes_arm64_decrypt);
  20
  21static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  22{
  23        struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
  24        int rounds = 6 + ctx->key_length / 4;
  25
  26        __aes_arm64_encrypt(ctx->key_enc, out, in, rounds);
  27}
  28
  29static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  30{
  31        struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
  32        int rounds = 6 + ctx->key_length / 4;
  33
  34        __aes_arm64_decrypt(ctx->key_dec, out, in, rounds);
  35}
  36
  37static struct crypto_alg aes_alg = {
  38        .cra_name                       = "aes",
  39        .cra_driver_name                = "aes-arm64",
  40        .cra_priority                   = 200,
  41        .cra_flags                      = CRYPTO_ALG_TYPE_CIPHER,
  42        .cra_blocksize                  = AES_BLOCK_SIZE,
  43        .cra_ctxsize                    = sizeof(struct crypto_aes_ctx),
  44        .cra_module                     = THIS_MODULE,
  45
  46        .cra_cipher.cia_min_keysize     = AES_MIN_KEY_SIZE,
  47        .cra_cipher.cia_max_keysize     = AES_MAX_KEY_SIZE,
  48        .cra_cipher.cia_setkey          = crypto_aes_set_key,
  49        .cra_cipher.cia_encrypt         = aes_encrypt,
  50        .cra_cipher.cia_decrypt         = aes_decrypt
  51};
  52
  53static int __init aes_init(void)
  54{
  55        return crypto_register_alg(&aes_alg);
  56}
  57
  58static void __exit aes_fini(void)
  59{
  60        crypto_unregister_alg(&aes_alg);
  61}
  62
  63module_init(aes_init);
  64module_exit(aes_fini);
  65
  66MODULE_DESCRIPTION("Scalar AES cipher for arm64");
  67MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  68MODULE_LICENSE("GPL v2");
  69MODULE_ALIAS_CRYPTO("aes");
  70