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 EXPORT_SYMBOL(__aes_arm_encrypt); 15 16 asmlinkage void __aes_arm_decrypt(u32 *rk, int rounds, const u8 *in, u8 *out); 17 EXPORT_SYMBOL(__aes_arm_decrypt); 18 19 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 20 { 21 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); 22 int rounds = 6 + ctx->key_length / 4; 23 24 __aes_arm_encrypt(ctx->key_enc, rounds, in, out); 25 } 26 27 static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 28 { 29 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm); 30 int rounds = 6 + ctx->key_length / 4; 31 32 __aes_arm_decrypt(ctx->key_dec, rounds, in, out); 33 } 34 35 static struct crypto_alg aes_alg = { 36 .cra_name = "aes", 37 .cra_driver_name = "aes-arm", 38 .cra_priority = 200, 39 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 40 .cra_blocksize = AES_BLOCK_SIZE, 41 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 42 .cra_module = THIS_MODULE, 43 44 .cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE, 45 .cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE, 46 .cra_cipher.cia_setkey = crypto_aes_set_key, 47 .cra_cipher.cia_encrypt = aes_encrypt, 48 .cra_cipher.cia_decrypt = aes_decrypt, 49 50 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 51 .cra_alignmask = 3, 52 #endif 53 }; 54 55 static int __init aes_init(void) 56 { 57 return crypto_register_alg(&aes_alg); 58 } 59 60 static void __exit aes_fini(void) 61 { 62 crypto_unregister_alg(&aes_alg); 63 } 64 65 module_init(aes_init); 66 module_exit(aes_fini); 67 68 MODULE_DESCRIPTION("Scalar AES cipher for ARM"); 69 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 70 MODULE_LICENSE("GPL v2"); 71 MODULE_ALIAS_CRYPTO("aes"); 72