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 <linux/crypto.h> 11 #include <linux/module.h> 12 13 asmlinkage void __aes_arm_encrypt(u32 *rk, int rounds, const u8 *in, u8 *out); 14 asmlinkage void __aes_arm_decrypt(u32 *rk, int rounds, const u8 *in, u8 *out); 15 16 static void aes_arm_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 17 { 18 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); 19 int rounds = 6 + ctx->key_length / 4; 20 21 __aes_arm_encrypt(ctx->key_enc, rounds, in, out); 22 } 23 24 static void aes_arm_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 25 { 26 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); 27 int rounds = 6 + ctx->key_length / 4; 28 29 __aes_arm_decrypt(ctx->key_dec, rounds, in, out); 30 } 31 32 static struct crypto_alg aes_alg = { 33 .cra_name = "aes", 34 .cra_driver_name = "aes-arm", 35 .cra_priority = 200, 36 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 37 .cra_blocksize = AES_BLOCK_SIZE, 38 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 39 .cra_module = THIS_MODULE, 40 41 .cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE, 42 .cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE, 43 .cra_cipher.cia_setkey = crypto_aes_set_key, 44 .cra_cipher.cia_encrypt = aes_arm_encrypt, 45 .cra_cipher.cia_decrypt = aes_arm_decrypt, 46 47 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 48 .cra_alignmask = 3, 49 #endif 50 }; 51 52 static int __init aes_init(void) 53 { 54 return crypto_register_alg(&aes_alg); 55 } 56 57 static void __exit aes_fini(void) 58 { 59 crypto_unregister_alg(&aes_alg); 60 } 61 62 module_init(aes_init); 63 module_exit(aes_fini); 64 65 MODULE_DESCRIPTION("Scalar AES cipher for ARM"); 66 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 67 MODULE_LICENSE("GPL v2"); 68 MODULE_ALIAS_CRYPTO("aes"); 69