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