arch/arm/crypto/aes-cipher-glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Scalar AES core transform
   4  *
   5  * Copyright (C) 2017 Linaro Ltd.
   6  * Author: Ard Biesheuvel <[email protected]>
   7  */
   8
   9 #include <crypto/aes.h>
  10 #include <crypto/algapi.h>
  11 #include <linux/module.h>
  12 #include "aes-cipher.h"
  13
  14 EXPORT_SYMBOL_GPL(__aes_arm_encrypt);
  15 EXPORT_SYMBOL_GPL(__aes_arm_decrypt);
  16
  17 static void aes_arm_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  18 {
  19         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
  20         int rounds = 6 + ctx->key_length / 4;
  21
  22         __aes_arm_encrypt(ctx->key_enc, rounds, in, out);
  23 }
  24
  25 static void aes_arm_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  26 {
  27         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
  28         int rounds = 6 + ctx->key_length / 4;
  29
  30         __aes_arm_decrypt(ctx->key_dec, rounds, in, out);
  31 }
  32
  33 static struct crypto_alg aes_alg = {
  34         .cra_name                       = "aes",
  35         .cra_driver_name                = "aes-arm",
  36         .cra_priority                   = 200,
  37         .cra_flags                      = CRYPTO_ALG_TYPE_CIPHER,
  38         .cra_blocksize                  = AES_BLOCK_SIZE,
  39         .cra_ctxsize                    = sizeof(struct crypto_aes_ctx),
  40         .cra_module                     = THIS_MODULE,
  41
  42         .cra_cipher.cia_min_keysize     = AES_MIN_KEY_SIZE,
  43         .cra_cipher.cia_max_keysize     = AES_MAX_KEY_SIZE,
  44         .cra_cipher.cia_setkey          = crypto_aes_set_key,
  45         .cra_cipher.cia_encrypt         = aes_arm_encrypt,
  46         .cra_cipher.cia_decrypt         = aes_arm_decrypt,
  47
  48 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
  49         .cra_alignmask                  = 3,
  50 #endif
  51 };
  52
  53 static int __init aes_init(void)
  54 {
  55         return crypto_register_alg(&aes_alg);
  56 }
  57
  58 static void __exit aes_fini(void)
  59 {
  60         crypto_unregister_alg(&aes_alg);
  61 }
  62
  63 module_init(aes_init);
  64 module_exit(aes_fini);
  65
  66 MODULE_DESCRIPTION("Scalar AES cipher for ARM");
  67 MODULE_AUTHOR("Ard Biesheuvel <[email protected]>");
  68 MODULE_LICENSE("GPL v2");
  69 MODULE_ALIAS_CRYPTO("aes");