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 EXPORT_SYMBOL(__aes_arm64_encrypt); 14 15 asmlinkage void __aes_arm64_decrypt(u32 *rk, u8 *out, const u8 *in, int rounds); 16 EXPORT_SYMBOL(__aes_arm64_decrypt); 17 18 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 19 { 20 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); 21 int rounds = 6 + ctx->key_length / 4; 22 23 __aes_arm64_encrypt(ctx->key_enc, out, in, rounds); 24 } 25 26 static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 27 { 28 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); 29 int rounds = 6 + ctx->key_length / 4; 30 31 __aes_arm64_decrypt(ctx->key_dec, out, in, rounds); 32 } 33 34 static struct crypto_alg aes_alg = { 35 .cra_name = "aes", 36 .cra_driver_name = "aes-arm64", 37 .cra_priority = 200, 38 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 39 .cra_blocksize = AES_BLOCK_SIZE, 40 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 41 .cra_module = THIS_MODULE, 42 43 .cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE, 44 .cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE, 45 .cra_cipher.cia_setkey = crypto_aes_set_key, 46 .cra_cipher.cia_encrypt = aes_encrypt, 47 .cra_cipher.cia_decrypt = aes_decrypt 48 }; 49 50 static int __init aes_init(void) 51 { 52 return crypto_register_alg(&aes_alg); 53 } 54 55 static void __exit aes_fini(void) 56 { 57 crypto_unregister_alg(&aes_alg); 58 } 59 60 module_init(aes_init); 61 module_exit(aes_fini); 62 63 MODULE_DESCRIPTION("Scalar AES cipher for arm64"); 64 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 65 MODULE_LICENSE("GPL v2"); 66 MODULE_ALIAS_CRYPTO("aes"); 67