arch/arm/crypto/aes-cipher-glue.c

   1 /*
   2  * Scalar AES core transform
   3  *
   4  * Copyright (C) 2017 Linaro Ltd.
   5  * Author: Ard Biesheuvel <ard.biesheuvel@linaro.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <crypto/aes.h>
  13 #include <linux/crypto.h>
  14 #include <linux/module.h>
  15
  16 asmlinkage void __aes_arm_encrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
  17 EXPORT_SYMBOL(__aes_arm_encrypt);
  18
  19 asmlinkage void __aes_arm_decrypt(u32 *rk, int rounds, const u8 *in, u8 *out);
  20 EXPORT_SYMBOL(__aes_arm_decrypt);
  21
  22 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  23 {
  24         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
  25         int rounds = 6 + ctx->key_length / 4;
  26
  27         __aes_arm_encrypt(ctx->key_enc, rounds, in, out);
  28 }
  29
  30 static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  31 {
  32         struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
  33         int rounds = 6 + ctx->key_length / 4;
  34
  35         __aes_arm_decrypt(ctx->key_dec, rounds, in, out);
  36 }
  37
  38 static struct crypto_alg aes_alg = {
  39         .cra_name                       = "aes",
  40         .cra_driver_name                = "aes-arm",
  41         .cra_priority                   = 200,
  42         .cra_flags                      = CRYPTO_ALG_TYPE_CIPHER,
  43         .cra_blocksize                  = AES_BLOCK_SIZE,
  44         .cra_ctxsize                    = sizeof(struct crypto_aes_ctx),
  45         .cra_module                     = THIS_MODULE,
  46
  47         .cra_cipher.cia_min_keysize     = AES_MIN_KEY_SIZE,
  48         .cra_cipher.cia_max_keysize     = AES_MAX_KEY_SIZE,
  49         .cra_cipher.cia_setkey          = crypto_aes_set_key,
  50         .cra_cipher.cia_encrypt         = aes_encrypt,
  51         .cra_cipher.cia_decrypt         = aes_decrypt,
  52
  53 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
  54         .cra_alignmask                  = 3,
  55 #endif
  56 };
  57
  58 static int __init aes_init(void)
  59 {
  60         return crypto_register_alg(&aes_alg);
  61 }
  62
  63 static void __exit aes_fini(void)
  64 {
  65         crypto_unregister_alg(&aes_alg);
  66 }
  67
  68 module_init(aes_init);
  69 module_exit(aes_fini);
  70
  71 MODULE_DESCRIPTION("Scalar AES cipher for ARM");
  72 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  73 MODULE_LICENSE("GPL v2");
  74 MODULE_ALIAS_CRYPTO("aes");