| /* |
| * The AEGIS-256 Authenticated-Encryption Algorithm |
| * Glue for AES-NI + SSE2 implementation |
| * |
| * Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com> |
| * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| */ |
| |
| #include <crypto/cryptd.h> |
| #include <crypto/internal/aead.h> |
| #include <crypto/internal/skcipher.h> |
| #include <crypto/scatterwalk.h> |
| #include <linux/module.h> |
| #include <asm/fpu/api.h> |
| #include <asm/cpu_device_id.h> |
| |
| #define AEGIS256_BLOCK_ALIGN 16 |
| #define AEGIS256_BLOCK_SIZE 16 |
| #define AEGIS256_NONCE_SIZE 32 |
| #define AEGIS256_STATE_BLOCKS 6 |
| #define AEGIS256_KEY_SIZE 32 |
| #define AEGIS256_MIN_AUTH_SIZE 8 |
| #define AEGIS256_MAX_AUTH_SIZE 16 |
| |
| asmlinkage void crypto_aegis256_aesni_init(void *state, void *key, void *iv); |
| |
| asmlinkage void crypto_aegis256_aesni_ad( |
| void *state, unsigned int length, const void *data); |
| |
| asmlinkage void crypto_aegis256_aesni_enc( |
| void *state, unsigned int length, const void *src, void *dst); |
| |
| asmlinkage void crypto_aegis256_aesni_dec( |
| void *state, unsigned int length, const void *src, void *dst); |
| |
| asmlinkage void crypto_aegis256_aesni_enc_tail( |
| void *state, unsigned int length, const void *src, void *dst); |
| |
| asmlinkage void crypto_aegis256_aesni_dec_tail( |
| void *state, unsigned int length, const void *src, void *dst); |
| |
| asmlinkage void crypto_aegis256_aesni_final( |
| void *state, void *tag_xor, unsigned int cryptlen, |
| unsigned int assoclen); |
| |
| struct aegis_block { |
| u8 bytes[AEGIS256_BLOCK_SIZE] __aligned(AEGIS256_BLOCK_ALIGN); |
| }; |
| |
| struct aegis_state { |
| struct aegis_block blocks[AEGIS256_STATE_BLOCKS]; |
| }; |
| |
| struct aegis_ctx { |
| struct aegis_block key[AEGIS256_KEY_SIZE / AEGIS256_BLOCK_SIZE]; |
| }; |
| |
| struct aegis_crypt_ops { |
| int (*skcipher_walk_init)(struct skcipher_walk *walk, |
| struct aead_request *req, bool atomic); |
| |
| void (*crypt_blocks)(void *state, unsigned int length, const void *src, |
| void *dst); |
| void (*crypt_tail)(void *state, unsigned int length, const void *src, |
| void *dst); |
| }; |
| |
| static void crypto_aegis256_aesni_process_ad( |
| struct aegis_state *state, struct scatterlist *sg_src, |
| unsigned int assoclen) |
| { |
| struct scatter_walk walk; |
| struct aegis_block buf; |
| unsigned int pos = 0; |
| |
| scatterwalk_start(&walk, sg_src); |
| while (assoclen != 0) { |
| unsigned int size = scatterwalk_clamp(&walk, assoclen); |
| unsigned int left = size; |
| void *mapped = scatterwalk_map(&walk); |
| const u8 *src = (const u8 *)mapped; |
| |
| if (pos + size >= AEGIS256_BLOCK_SIZE) { |
| if (pos > 0) { |
| unsigned int fill = AEGIS256_BLOCK_SIZE - pos; |
| memcpy(buf.bytes + pos, src, fill); |
| crypto_aegis256_aesni_ad(state, |
| AEGIS256_BLOCK_SIZE, |
| buf.bytes); |
| pos = 0; |
| left -= fill; |
| src += fill; |
| } |
| |
| crypto_aegis256_aesni_ad(state, left, src); |
| |
| src += left & ~(AEGIS256_BLOCK_SIZE - 1); |
| left &= AEGIS256_BLOCK_SIZE - 1; |
| } |
| |
| memcpy(buf.bytes + pos, src, left); |
| pos += left; |
| assoclen -= size; |
| |
| scatterwalk_unmap(mapped); |
| scatterwalk_advance(&walk, size); |
| scatterwalk_done(&walk, 0, assoclen); |
| } |
| |
| if (pos > 0) { |
| memset(buf.bytes + pos, 0, AEGIS256_BLOCK_SIZE - pos); |
| crypto_aegis256_aesni_ad(state, AEGIS256_BLOCK_SIZE, buf.bytes); |
| } |
| } |
| |
| static void crypto_aegis256_aesni_process_crypt( |
| struct aegis_state *state, struct aead_request *req, |
| const struct aegis_crypt_ops *ops) |
| { |
| struct skcipher_walk walk; |
| u8 *src, *dst; |
| unsigned int chunksize, base; |
| |
| ops->skcipher_walk_init(&walk, req, false); |
| |
| while (walk.nbytes) { |
| src = walk.src.virt.addr; |
| dst = walk.dst.virt.addr; |
| chunksize = walk.nbytes; |
| |
| ops->crypt_blocks(state, chunksize, src, dst); |
| |
| base = chunksize & ~(AEGIS256_BLOCK_SIZE - 1); |
| src += base; |
| dst += base; |
| chunksize &= AEGIS256_BLOCK_SIZE - 1; |
| |
| if (chunksize > 0) |
| ops->crypt_tail(state, chunksize, src, dst); |
| |
| skcipher_walk_done(&walk, 0); |
| } |
| } |
| |
| static struct aegis_ctx *crypto_aegis256_aesni_ctx(struct crypto_aead *aead) |
| { |
| u8 *ctx = crypto_aead_ctx(aead); |
| ctx = PTR_ALIGN(ctx, __alignof__(struct aegis_ctx)); |
| return (void *)ctx; |
| } |
| |
| static int crypto_aegis256_aesni_setkey(struct crypto_aead *aead, const u8 *key, |
| unsigned int keylen) |
| { |
| struct aegis_ctx *ctx = crypto_aegis256_aesni_ctx(aead); |
| |
| if (keylen != AEGIS256_KEY_SIZE) { |
| crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN); |
| return -EINVAL; |
| } |
| |
| memcpy(ctx->key, key, AEGIS256_KEY_SIZE); |
| |
| return 0; |
| } |
| |
| static int crypto_aegis256_aesni_setauthsize(struct crypto_aead *tfm, |
| unsigned int authsize) |
| { |
| if (authsize > AEGIS256_MAX_AUTH_SIZE) |
| return -EINVAL; |
| if (authsize < AEGIS256_MIN_AUTH_SIZE) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static void crypto_aegis256_aesni_crypt(struct aead_request *req, |
| struct aegis_block *tag_xor, |
| unsigned int cryptlen, |
| const struct aegis_crypt_ops *ops) |
| { |
| struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
| struct aegis_ctx *ctx = crypto_aegis256_aesni_ctx(tfm); |
| struct aegis_state state; |
| |
| kernel_fpu_begin(); |
| |
| crypto_aegis256_aesni_init(&state, ctx->key, req->iv); |
| crypto_aegis256_aesni_process_ad(&state, req->src, req->assoclen); |
| crypto_aegis256_aesni_process_crypt(&state, req, ops); |
| crypto_aegis256_aesni_final(&state, tag_xor, req->assoclen, cryptlen); |
| |
| kernel_fpu_end(); |
| } |
| |
| static int crypto_aegis256_aesni_encrypt(struct aead_request *req) |
| { |
| static const struct aegis_crypt_ops OPS = { |
| .skcipher_walk_init = skcipher_walk_aead_encrypt, |
| .crypt_blocks = crypto_aegis256_aesni_enc, |
| .crypt_tail = crypto_aegis256_aesni_enc_tail, |
| }; |
| |
| struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
| struct aegis_block tag = {}; |
| unsigned int authsize = crypto_aead_authsize(tfm); |
| unsigned int cryptlen = req->cryptlen; |
| |
| crypto_aegis256_aesni_crypt(req, &tag, cryptlen, &OPS); |
| |
| scatterwalk_map_and_copy(tag.bytes, req->dst, |
| req->assoclen + cryptlen, authsize, 1); |
| return 0; |
| } |
| |
| static int crypto_aegis256_aesni_decrypt(struct aead_request *req) |
| { |
| static const struct aegis_block zeros = {}; |
| |
| static const struct aegis_crypt_ops OPS = { |
| .skcipher_walk_init = skcipher_walk_aead_decrypt, |
| .crypt_blocks = crypto_aegis256_aesni_dec, |
| .crypt_tail = crypto_aegis256_aesni_dec_tail, |
| }; |
| |
| struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
| struct aegis_block tag; |
| unsigned int authsize = crypto_aead_authsize(tfm); |
| unsigned int cryptlen = req->cryptlen - authsize; |
| |
| scatterwalk_map_and_copy(tag.bytes, req->src, |
| req->assoclen + cryptlen, authsize, 0); |
| |
| crypto_aegis256_aesni_crypt(req, &tag, cryptlen, &OPS); |
| |
| return crypto_memneq(tag.bytes, zeros.bytes, authsize) ? -EBADMSG : 0; |
| } |
| |
| static int crypto_aegis256_aesni_init_tfm(struct crypto_aead *aead) |
| { |
| return 0; |
| } |
| |
| static void crypto_aegis256_aesni_exit_tfm(struct crypto_aead *aead) |
| { |
| } |
| |
| static int cryptd_aegis256_aesni_setkey(struct crypto_aead *aead, |
| const u8 *key, unsigned int keylen) |
| { |
| struct cryptd_aead **ctx = crypto_aead_ctx(aead); |
| struct cryptd_aead *cryptd_tfm = *ctx; |
| |
| return crypto_aead_setkey(&cryptd_tfm->base, key, keylen); |
| } |
| |
| static int cryptd_aegis256_aesni_setauthsize(struct crypto_aead *aead, |
| unsigned int authsize) |
| { |
| struct cryptd_aead **ctx = crypto_aead_ctx(aead); |
| struct cryptd_aead *cryptd_tfm = *ctx; |
| |
| return crypto_aead_setauthsize(&cryptd_tfm->base, authsize); |
| } |
| |
| static int cryptd_aegis256_aesni_encrypt(struct aead_request *req) |
| { |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| struct cryptd_aead **ctx = crypto_aead_ctx(aead); |
| struct cryptd_aead *cryptd_tfm = *ctx; |
| |
| aead = &cryptd_tfm->base; |
| if (irq_fpu_usable() && (!in_atomic() || |
| !cryptd_aead_queued(cryptd_tfm))) |
| aead = cryptd_aead_child(cryptd_tfm); |
| |
| aead_request_set_tfm(req, aead); |
| |
| return crypto_aead_encrypt(req); |
| } |
| |
| static int cryptd_aegis256_aesni_decrypt(struct aead_request *req) |
| { |
| struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| struct cryptd_aead **ctx = crypto_aead_ctx(aead); |
| struct cryptd_aead *cryptd_tfm = *ctx; |
| |
| aead = &cryptd_tfm->base; |
| if (irq_fpu_usable() && (!in_atomic() || |
| !cryptd_aead_queued(cryptd_tfm))) |
| aead = cryptd_aead_child(cryptd_tfm); |
| |
| aead_request_set_tfm(req, aead); |
| |
| return crypto_aead_decrypt(req); |
| } |
| |
| static int cryptd_aegis256_aesni_init_tfm(struct crypto_aead *aead) |
| { |
| struct cryptd_aead *cryptd_tfm; |
| struct cryptd_aead **ctx = crypto_aead_ctx(aead); |
| |
| cryptd_tfm = cryptd_alloc_aead("__aegis256-aesni", CRYPTO_ALG_INTERNAL, |
| CRYPTO_ALG_INTERNAL); |
| if (IS_ERR(cryptd_tfm)) |
| return PTR_ERR(cryptd_tfm); |
| |
| *ctx = cryptd_tfm; |
| crypto_aead_set_reqsize(aead, crypto_aead_reqsize(&cryptd_tfm->base)); |
| return 0; |
| } |
| |
| static void cryptd_aegis256_aesni_exit_tfm(struct crypto_aead *aead) |
| { |
| struct cryptd_aead **ctx = crypto_aead_ctx(aead); |
| |
| cryptd_free_aead(*ctx); |
| } |
| |
| static struct aead_alg crypto_aegis256_aesni_alg[] = { |
| { |
| .setkey = crypto_aegis256_aesni_setkey, |
| .setauthsize = crypto_aegis256_aesni_setauthsize, |
| .encrypt = crypto_aegis256_aesni_encrypt, |
| .decrypt = crypto_aegis256_aesni_decrypt, |
| .init = crypto_aegis256_aesni_init_tfm, |
| .exit = crypto_aegis256_aesni_exit_tfm, |
| |
| .ivsize = AEGIS256_NONCE_SIZE, |
| .maxauthsize = AEGIS256_MAX_AUTH_SIZE, |
| .chunksize = AEGIS256_BLOCK_SIZE, |
| |
| .base = { |
| .cra_flags = CRYPTO_ALG_INTERNAL, |
| .cra_blocksize = 1, |
| .cra_ctxsize = sizeof(struct aegis_ctx) + |
| __alignof__(struct aegis_ctx), |
| .cra_alignmask = 0, |
| |
| .cra_name = "__aegis256", |
| .cra_driver_name = "__aegis256-aesni", |
| |
| .cra_module = THIS_MODULE, |
| } |
| }, { |
| .setkey = cryptd_aegis256_aesni_setkey, |
| .setauthsize = cryptd_aegis256_aesni_setauthsize, |
| .encrypt = cryptd_aegis256_aesni_encrypt, |
| .decrypt = cryptd_aegis256_aesni_decrypt, |
| .init = cryptd_aegis256_aesni_init_tfm, |
| .exit = cryptd_aegis256_aesni_exit_tfm, |
| |
| .ivsize = AEGIS256_NONCE_SIZE, |
| .maxauthsize = AEGIS256_MAX_AUTH_SIZE, |
| .chunksize = AEGIS256_BLOCK_SIZE, |
| |
| .base = { |
| .cra_flags = CRYPTO_ALG_ASYNC, |
| .cra_blocksize = 1, |
| .cra_ctxsize = sizeof(struct cryptd_aead *), |
| .cra_alignmask = 0, |
| |
| .cra_priority = 400, |
| |
| .cra_name = "aegis256", |
| .cra_driver_name = "aegis256-aesni", |
| |
| .cra_module = THIS_MODULE, |
| } |
| } |
| }; |
| |
| static int __init crypto_aegis256_aesni_module_init(void) |
| { |
| if (!boot_cpu_has(X86_FEATURE_XMM2) || |
| !boot_cpu_has(X86_FEATURE_AES) || |
| !cpu_has_xfeatures(XFEATURE_MASK_SSE, NULL)) |
| return -ENODEV; |
| |
| return crypto_register_aeads(crypto_aegis256_aesni_alg, |
| ARRAY_SIZE(crypto_aegis256_aesni_alg)); |
| } |
| |
| static void __exit crypto_aegis256_aesni_module_exit(void) |
| { |
| crypto_unregister_aeads(crypto_aegis256_aesni_alg, |
| ARRAY_SIZE(crypto_aegis256_aesni_alg)); |
| } |
| |
| module_init(crypto_aegis256_aesni_module_init); |
| module_exit(crypto_aegis256_aesni_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>"); |
| MODULE_DESCRIPTION("AEGIS-256 AEAD algorithm -- AESNI+SSE2 implementation"); |
| MODULE_ALIAS_CRYPTO("aegis256"); |
| MODULE_ALIAS_CRYPTO("aegis256-aesni"); |