arm64/crypto/aes-cipher-glue.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Scalar AES core transform
0004  *
0005  * Copyright (C) 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
0006  */
0007
0008 #include <crypto/aes.h>
0009 #include <linux/crypto.h>
0010 #include <linux/module.h>
0011
0012 asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
0013 asmlinkage void __aes_arm64_decrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
0014
0015 static void aes_arm64_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
0016 {
0017     struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
0018     int rounds = 6 + ctx->key_length / 4;
0019
0020     __aes_arm64_encrypt(ctx->key_enc, out, in, rounds);
0021 }
0022
0023 static void aes_arm64_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
0024 {
0025     struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
0026     int rounds = 6 + ctx->key_length / 4;
0027
0028     __aes_arm64_decrypt(ctx->key_dec, out, in, rounds);
0029 }
0030
0031 static struct crypto_alg aes_alg = {
0032     .cra_name           = "aes",
0033     .cra_driver_name        = "aes-arm64",
0034     .cra_priority           = 200,
0035     .cra_flags          = CRYPTO_ALG_TYPE_CIPHER,
0036     .cra_blocksize          = AES_BLOCK_SIZE,
0037     .cra_ctxsize            = sizeof(struct crypto_aes_ctx),
0038     .cra_module         = THIS_MODULE,
0039
0040     .cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE,
0041     .cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE,
0042     .cra_cipher.cia_setkey      = crypto_aes_set_key,
0043     .cra_cipher.cia_encrypt     = aes_arm64_encrypt,
0044     .cra_cipher.cia_decrypt     = aes_arm64_decrypt
0045 };
0046
0047 static int __init aes_init(void)
0048 {
0049     return crypto_register_alg(&aes_alg);
0050 }
0051
0052 static void __exit aes_fini(void)
0053 {
0054     crypto_unregister_alg(&aes_alg);
0055 }
0056
0057 module_init(aes_init);
0058 module_exit(aes_fini);
0059
0060 MODULE_DESCRIPTION("Scalar AES cipher for arm64");
0061 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
0062 MODULE_LICENSE("GPL v2");
0063 MODULE_ALIAS_CRYPTO("aes");