arch/arm64/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 <ard.biesheuvel@linaro.org>
   6  */
   7
   8 #include <crypto/aes.h>
   9 #include <linux/crypto.h>
  10 #include <linux/module.h>
  11
  12 asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
  13 asmlinkage void __aes_arm64_decrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
  14
  15 static void aes_arm64_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  16 {
  17         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
  18         int rounds = 6 + ctx->key_length / 4;
  19
  20         __aes_arm64_encrypt(ctx->key_enc, out, in, rounds);
  21 }
  22
  23 static void aes_arm64_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  24 {
  25         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
  26         int rounds = 6 + ctx->key_length / 4;
  27
  28         __aes_arm64_decrypt(ctx->key_dec, out, in, rounds);
  29 }
  30
  31 static struct crypto_alg aes_alg = {
  32         .cra_name                       = "aes",
  33         .cra_driver_name                = "aes-arm64",
  34         .cra_priority                   = 200,
  35         .cra_flags                      = CRYPTO_ALG_TYPE_CIPHER,
  36         .cra_blocksize                  = AES_BLOCK_SIZE,
  37         .cra_ctxsize                    = sizeof(struct crypto_aes_ctx),
  38         .cra_module                     = THIS_MODULE,
  39
  40         .cra_cipher.cia_min_keysize     = AES_MIN_KEY_SIZE,
  41         .cra_cipher.cia_max_keysize     = AES_MAX_KEY_SIZE,
  42         .cra_cipher.cia_setkey          = crypto_aes_set_key,
  43         .cra_cipher.cia_encrypt         = aes_arm64_encrypt,
  44         .cra_cipher.cia_decrypt         = aes_arm64_decrypt
  45 };
  46
  47 static int __init aes_init(void)
  48 {
  49         return crypto_register_alg(&aes_alg);
  50 }
  51
  52 static void __exit aes_fini(void)
  53 {
  54         crypto_unregister_alg(&aes_alg);
  55 }
  56
  57 module_init(aes_init);
  58 module_exit(aes_fini);
  59
  60 MODULE_DESCRIPTION("Scalar AES cipher for arm64");
  61 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  62 MODULE_LICENSE("GPL v2");
  63 MODULE_ALIAS_CRYPTO("aes");