395 lines
11 KiB
C
395 lines
11 KiB
C
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/*
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* The AEGIS-128L Authenticated-Encryption Algorithm
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* Glue for AES-NI + SSE2 implementation
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*
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* Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
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* Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <crypto/cryptd.h>
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#include <crypto/internal/aead.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <linux/module.h>
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#include <asm/fpu/api.h>
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#include <asm/cpu_device_id.h>
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#define AEGIS128L_BLOCK_ALIGN 16
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#define AEGIS128L_BLOCK_SIZE 32
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#define AEGIS128L_NONCE_SIZE 16
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#define AEGIS128L_STATE_BLOCKS 8
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#define AEGIS128L_KEY_SIZE 16
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#define AEGIS128L_MIN_AUTH_SIZE 8
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#define AEGIS128L_MAX_AUTH_SIZE 16
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asmlinkage void crypto_aegis128l_aesni_init(void *state, void *key, void *iv);
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asmlinkage void crypto_aegis128l_aesni_ad(
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void *state, unsigned int length, const void *data);
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asmlinkage void crypto_aegis128l_aesni_enc(
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void *state, unsigned int length, const void *src, void *dst);
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asmlinkage void crypto_aegis128l_aesni_dec(
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void *state, unsigned int length, const void *src, void *dst);
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asmlinkage void crypto_aegis128l_aesni_enc_tail(
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void *state, unsigned int length, const void *src, void *dst);
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asmlinkage void crypto_aegis128l_aesni_dec_tail(
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void *state, unsigned int length, const void *src, void *dst);
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asmlinkage void crypto_aegis128l_aesni_final(
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void *state, void *tag_xor, unsigned int cryptlen,
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unsigned int assoclen);
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struct aegis_block {
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u8 bytes[AEGIS128L_BLOCK_SIZE] __aligned(AEGIS128L_BLOCK_ALIGN);
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};
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struct aegis_state {
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struct aegis_block blocks[AEGIS128L_STATE_BLOCKS];
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};
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struct aegis_ctx {
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struct aegis_block key;
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};
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struct aegis_crypt_ops {
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int (*skcipher_walk_init)(struct skcipher_walk *walk,
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struct aead_request *req, bool atomic);
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void (*crypt_blocks)(void *state, unsigned int length, const void *src,
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void *dst);
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void (*crypt_tail)(void *state, unsigned int length, const void *src,
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void *dst);
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};
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static void crypto_aegis128l_aesni_process_ad(
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struct aegis_state *state, struct scatterlist *sg_src,
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unsigned int assoclen)
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{
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struct scatter_walk walk;
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struct aegis_block buf;
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unsigned int pos = 0;
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scatterwalk_start(&walk, sg_src);
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while (assoclen != 0) {
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unsigned int size = scatterwalk_clamp(&walk, assoclen);
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unsigned int left = size;
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void *mapped = scatterwalk_map(&walk);
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const u8 *src = (const u8 *)mapped;
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if (pos + size >= AEGIS128L_BLOCK_SIZE) {
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if (pos > 0) {
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unsigned int fill = AEGIS128L_BLOCK_SIZE - pos;
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memcpy(buf.bytes + pos, src, fill);
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crypto_aegis128l_aesni_ad(state,
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AEGIS128L_BLOCK_SIZE,
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buf.bytes);
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pos = 0;
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left -= fill;
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src += fill;
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}
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crypto_aegis128l_aesni_ad(state, left, src);
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src += left & ~(AEGIS128L_BLOCK_SIZE - 1);
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left &= AEGIS128L_BLOCK_SIZE - 1;
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}
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memcpy(buf.bytes + pos, src, left);
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pos += left;
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assoclen -= size;
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scatterwalk_unmap(mapped);
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scatterwalk_advance(&walk, size);
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scatterwalk_done(&walk, 0, assoclen);
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}
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if (pos > 0) {
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memset(buf.bytes + pos, 0, AEGIS128L_BLOCK_SIZE - pos);
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crypto_aegis128l_aesni_ad(state, AEGIS128L_BLOCK_SIZE, buf.bytes);
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}
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}
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static void crypto_aegis128l_aesni_process_crypt(
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struct aegis_state *state, struct skcipher_walk *walk,
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const struct aegis_crypt_ops *ops)
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{
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while (walk->nbytes >= AEGIS128L_BLOCK_SIZE) {
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ops->crypt_blocks(state, round_down(walk->nbytes,
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AEGIS128L_BLOCK_SIZE),
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walk->src.virt.addr, walk->dst.virt.addr);
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skcipher_walk_done(walk, walk->nbytes % AEGIS128L_BLOCK_SIZE);
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}
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if (walk->nbytes) {
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ops->crypt_tail(state, walk->nbytes, walk->src.virt.addr,
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walk->dst.virt.addr);
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skcipher_walk_done(walk, 0);
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}
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}
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static struct aegis_ctx *crypto_aegis128l_aesni_ctx(struct crypto_aead *aead)
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{
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u8 *ctx = crypto_aead_ctx(aead);
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ctx = PTR_ALIGN(ctx, __alignof__(struct aegis_ctx));
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return (void *)ctx;
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}
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static int crypto_aegis128l_aesni_setkey(struct crypto_aead *aead,
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const u8 *key, unsigned int keylen)
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{
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struct aegis_ctx *ctx = crypto_aegis128l_aesni_ctx(aead);
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if (keylen != AEGIS128L_KEY_SIZE) {
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crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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memcpy(ctx->key.bytes, key, AEGIS128L_KEY_SIZE);
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return 0;
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}
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static int crypto_aegis128l_aesni_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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if (authsize > AEGIS128L_MAX_AUTH_SIZE)
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return -EINVAL;
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if (authsize < AEGIS128L_MIN_AUTH_SIZE)
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return -EINVAL;
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return 0;
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}
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static void crypto_aegis128l_aesni_crypt(struct aead_request *req,
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struct aegis_block *tag_xor,
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unsigned int cryptlen,
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const struct aegis_crypt_ops *ops)
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{
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct aegis_ctx *ctx = crypto_aegis128l_aesni_ctx(tfm);
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struct skcipher_walk walk;
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struct aegis_state state;
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ops->skcipher_walk_init(&walk, req, true);
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kernel_fpu_begin();
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crypto_aegis128l_aesni_init(&state, ctx->key.bytes, req->iv);
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crypto_aegis128l_aesni_process_ad(&state, req->src, req->assoclen);
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crypto_aegis128l_aesni_process_crypt(&state, &walk, ops);
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crypto_aegis128l_aesni_final(&state, tag_xor, req->assoclen, cryptlen);
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kernel_fpu_end();
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}
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static int crypto_aegis128l_aesni_encrypt(struct aead_request *req)
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{
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static const struct aegis_crypt_ops OPS = {
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.skcipher_walk_init = skcipher_walk_aead_encrypt,
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.crypt_blocks = crypto_aegis128l_aesni_enc,
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.crypt_tail = crypto_aegis128l_aesni_enc_tail,
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};
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct aegis_block tag = {};
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unsigned int authsize = crypto_aead_authsize(tfm);
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unsigned int cryptlen = req->cryptlen;
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crypto_aegis128l_aesni_crypt(req, &tag, cryptlen, &OPS);
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scatterwalk_map_and_copy(tag.bytes, req->dst,
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req->assoclen + cryptlen, authsize, 1);
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return 0;
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}
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static int crypto_aegis128l_aesni_decrypt(struct aead_request *req)
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{
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static const struct aegis_block zeros = {};
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static const struct aegis_crypt_ops OPS = {
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.skcipher_walk_init = skcipher_walk_aead_decrypt,
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.crypt_blocks = crypto_aegis128l_aesni_dec,
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.crypt_tail = crypto_aegis128l_aesni_dec_tail,
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};
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct aegis_block tag;
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unsigned int authsize = crypto_aead_authsize(tfm);
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unsigned int cryptlen = req->cryptlen - authsize;
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scatterwalk_map_and_copy(tag.bytes, req->src,
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req->assoclen + cryptlen, authsize, 0);
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crypto_aegis128l_aesni_crypt(req, &tag, cryptlen, &OPS);
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return crypto_memneq(tag.bytes, zeros.bytes, authsize) ? -EBADMSG : 0;
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}
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static int crypto_aegis128l_aesni_init_tfm(struct crypto_aead *aead)
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{
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return 0;
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}
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static void crypto_aegis128l_aesni_exit_tfm(struct crypto_aead *aead)
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{
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}
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static int cryptd_aegis128l_aesni_setkey(struct crypto_aead *aead,
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const u8 *key, unsigned int keylen)
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{
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struct cryptd_aead **ctx = crypto_aead_ctx(aead);
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struct cryptd_aead *cryptd_tfm = *ctx;
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return crypto_aead_setkey(&cryptd_tfm->base, key, keylen);
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}
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static int cryptd_aegis128l_aesni_setauthsize(struct crypto_aead *aead,
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unsigned int authsize)
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{
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struct cryptd_aead **ctx = crypto_aead_ctx(aead);
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struct cryptd_aead *cryptd_tfm = *ctx;
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return crypto_aead_setauthsize(&cryptd_tfm->base, authsize);
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}
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static int cryptd_aegis128l_aesni_encrypt(struct aead_request *req)
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct cryptd_aead **ctx = crypto_aead_ctx(aead);
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struct cryptd_aead *cryptd_tfm = *ctx;
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aead = &cryptd_tfm->base;
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if (irq_fpu_usable() && (!in_atomic() ||
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!cryptd_aead_queued(cryptd_tfm)))
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aead = cryptd_aead_child(cryptd_tfm);
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aead_request_set_tfm(req, aead);
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return crypto_aead_encrypt(req);
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}
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static int cryptd_aegis128l_aesni_decrypt(struct aead_request *req)
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct cryptd_aead **ctx = crypto_aead_ctx(aead);
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struct cryptd_aead *cryptd_tfm = *ctx;
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aead = &cryptd_tfm->base;
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if (irq_fpu_usable() && (!in_atomic() ||
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!cryptd_aead_queued(cryptd_tfm)))
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aead = cryptd_aead_child(cryptd_tfm);
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aead_request_set_tfm(req, aead);
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return crypto_aead_decrypt(req);
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}
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static int cryptd_aegis128l_aesni_init_tfm(struct crypto_aead *aead)
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{
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struct cryptd_aead *cryptd_tfm;
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struct cryptd_aead **ctx = crypto_aead_ctx(aead);
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cryptd_tfm = cryptd_alloc_aead("__aegis128l-aesni", CRYPTO_ALG_INTERNAL,
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CRYPTO_ALG_INTERNAL);
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if (IS_ERR(cryptd_tfm))
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return PTR_ERR(cryptd_tfm);
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*ctx = cryptd_tfm;
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crypto_aead_set_reqsize(aead, crypto_aead_reqsize(&cryptd_tfm->base));
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return 0;
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}
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static void cryptd_aegis128l_aesni_exit_tfm(struct crypto_aead *aead)
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{
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struct cryptd_aead **ctx = crypto_aead_ctx(aead);
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cryptd_free_aead(*ctx);
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}
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static struct aead_alg crypto_aegis128l_aesni_alg[] = {
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{
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.setkey = crypto_aegis128l_aesni_setkey,
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.setauthsize = crypto_aegis128l_aesni_setauthsize,
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.encrypt = crypto_aegis128l_aesni_encrypt,
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.decrypt = crypto_aegis128l_aesni_decrypt,
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.init = crypto_aegis128l_aesni_init_tfm,
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.exit = crypto_aegis128l_aesni_exit_tfm,
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.ivsize = AEGIS128L_NONCE_SIZE,
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.maxauthsize = AEGIS128L_MAX_AUTH_SIZE,
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.chunksize = AEGIS128L_BLOCK_SIZE,
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.base = {
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.cra_flags = CRYPTO_ALG_INTERNAL,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct aegis_ctx) +
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__alignof__(struct aegis_ctx),
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.cra_alignmask = 0,
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.cra_name = "__aegis128l",
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.cra_driver_name = "__aegis128l-aesni",
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.cra_module = THIS_MODULE,
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}
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}, {
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.setkey = cryptd_aegis128l_aesni_setkey,
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.setauthsize = cryptd_aegis128l_aesni_setauthsize,
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.encrypt = cryptd_aegis128l_aesni_encrypt,
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.decrypt = cryptd_aegis128l_aesni_decrypt,
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.init = cryptd_aegis128l_aesni_init_tfm,
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|
.exit = cryptd_aegis128l_aesni_exit_tfm,
|
||
|
|
|
||
|
|
.ivsize = AEGIS128L_NONCE_SIZE,
|
||
|
|
.maxauthsize = AEGIS128L_MAX_AUTH_SIZE,
|
||
|
|
.chunksize = AEGIS128L_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 = "aegis128l",
|
||
|
|
.cra_driver_name = "aegis128l-aesni",
|
||
|
|
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init crypto_aegis128l_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_aegis128l_aesni_alg,
|
||
|
|
ARRAY_SIZE(crypto_aegis128l_aesni_alg));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit crypto_aegis128l_aesni_module_exit(void)
|
||
|
|
{
|
||
|
|
crypto_unregister_aeads(crypto_aegis128l_aesni_alg,
|
||
|
|
ARRAY_SIZE(crypto_aegis128l_aesni_alg));
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(crypto_aegis128l_aesni_module_init);
|
||
|
|
module_exit(crypto_aegis128l_aesni_module_exit);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
|
||
|
|
MODULE_DESCRIPTION("AEGIS-128L AEAD algorithm -- AESNI+SSE2 implementation");
|
||
|
|
MODULE_ALIAS_CRYPTO("aegis128l");
|
||
|
|
MODULE_ALIAS_CRYPTO("aegis128l-aesni");
|