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
  15 asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
  16 EXPORT_SYMBOL(__aes_arm64_encrypt);
  17
  18 asmlinkage void __aes_arm64_decrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
  19 EXPORT_SYMBOL(__aes_arm64_decrypt);
  20
  21 static 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
  29 static 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
  37 static 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
  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 arm64");
  67 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  68 MODULE_LICENSE("GPL v2");
  69 MODULE_ALIAS_CRYPTO("aes");