1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Scalar AES core transform 4 * 5 * Copyright (C) 2017 Linaro Ltd <ard.biesheuvel@linaro.org> 6 */ 7 8 #include <crypto/aes.h> 9 #include <linux/crypto.h> 10 #include <linux/module.h> 11 12 asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds); 13 asmlinkage void __aes_arm64_decrypt(u32 *rk, u8 *out, const u8 *in, int rounds); 14 15 static void aes_arm64_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 16 { 17 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); 18 int rounds = 6 + ctx->key_length / 4; 19 20 __aes_arm64_encrypt(ctx->key_enc, out, in, rounds); 21 } 22 23 static void aes_arm64_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 24 { 25 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); 26 int rounds = 6 + ctx->key_length / 4; 27 28 __aes_arm64_decrypt(ctx->key_dec, out, in, rounds); 29 } 30 31 static struct crypto_alg aes_alg = { 32 .cra_name = "aes", 33 .cra_driver_name = "aes-arm64", 34 .cra_priority = 200, 35 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 36 .cra_blocksize = AES_BLOCK_SIZE, 37 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 38 .cra_module = THIS_MODULE, 39 40 .cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE, 41 .cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE, 42 .cra_cipher.cia_setkey = crypto_aes_set_key, 43 .cra_cipher.cia_encrypt = aes_arm64_encrypt, 44 .cra_cipher.cia_decrypt = aes_arm64_decrypt 45 }; 46 47 static int __init aes_init(void) 48 { 49 return crypto_register_alg(&aes_alg); 50 } 51 52 static void __exit aes_fini(void) 53 { 54 crypto_unregister_alg(&aes_alg); 55 } 56 57 module_init(aes_init); 58 module_exit(aes_fini); 59 60 MODULE_DESCRIPTION("Scalar AES cipher for arm64"); 61 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 62 MODULE_LICENSE("GPL v2"); 63 MODULE_ALIAS_CRYPTO("aes"); 64