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