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