| Ard Biesheuvel | b7912e0 | 2017-01-11 16:41:53 +0000 | [diff] [blame] | 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"); |