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 <ard.biesheuvel@linaro.org>
   7  */
   8
   9 #include <crypto/aes.h>
  10 #include <linux/crypto.h>
  11 #include <linux/module.h>
  12
  13 asmlinkage void __aes_arm_encrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
  14 EXPORT_SYMBOL(__aes_arm_encrypt);
  15
  16 asmlinkage void __aes_arm_decrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
  17 EXPORT_SYMBOL(__aes_arm_decrypt);
  18
  19 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  20 {
  21         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
  22         int rounds = 6 + ctx->key_length / 4;
  23
  24         __aes_arm_encrypt(ctx->key_enc, rounds, in, out);
  25 }
  26
  27 static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  28 {
  29         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
  30         int rounds = 6 + ctx->key_length / 4;
  31
  32         __aes_arm_decrypt(ctx->key_dec, rounds, in, out);
  33 }
  34
  35 static struct crypto_alg aes_alg = {
  36         .cra_name                       = "aes",
  37         .cra_driver_name                = "aes-arm",
  38         .cra_priority                   = 200,
  39         .cra_flags                      = CRYPTO_ALG_TYPE_CIPHER,
  40         .cra_blocksize                  = AES_BLOCK_SIZE,
  41         .cra_ctxsize                    = sizeof(struct crypto_aes_ctx),
  42         .cra_module                     = THIS_MODULE,
  43
  44         .cra_cipher.cia_min_keysize     = AES_MIN_KEY_SIZE,
  45         .cra_cipher.cia_max_keysize     = AES_MAX_KEY_SIZE,
  46         .cra_cipher.cia_setkey          = crypto_aes_set_key,
  47         .cra_cipher.cia_encrypt         = aes_encrypt,
  48         .cra_cipher.cia_decrypt         = aes_decrypt,
  49
  50 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
  51         .cra_alignmask                  = 3,
  52 #endif
  53 };
  54
  55 static int __init aes_init(void)
  56 {
  57         return crypto_register_alg(&aes_alg);
  58 }
  59
  60 static void __exit aes_fini(void)
  61 {
  62         crypto_unregister_alg(&aes_alg);
  63 }
  64
  65 module_init(aes_init);
  66 module_exit(aes_fini);
  67
  68 MODULE_DESCRIPTION("Scalar AES cipher for ARM");
  69 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  70 MODULE_LICENSE("GPL v2");
  71 MODULE_ALIAS_CRYPTO("aes");