290 lines
8.2 KiB
C
290 lines
8.2 KiB
C
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/*
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* The MORUS-640 Authenticated-Encryption Algorithm
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* Common x86 SIMD glue skeleton
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*
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* Copyright (c) 2016-2018 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/morus640_glue.h>
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#include <crypto/scatterwalk.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <asm/fpu/api.h>
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struct morus640_state {
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struct morus640_block s[MORUS_STATE_BLOCKS];
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};
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struct morus640_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, const void *src, void *dst,
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unsigned int length);
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void (*crypt_tail)(void *state, const void *src, void *dst,
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unsigned int length);
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};
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static void crypto_morus640_glue_process_ad(
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struct morus640_state *state,
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const struct morus640_glue_ops *ops,
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struct scatterlist *sg_src, unsigned int assoclen)
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{
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struct scatter_walk walk;
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struct morus640_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 >= MORUS640_BLOCK_SIZE) {
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if (pos > 0) {
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unsigned int fill = MORUS640_BLOCK_SIZE - pos;
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memcpy(buf.bytes + pos, src, fill);
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ops->ad(state, buf.bytes, MORUS640_BLOCK_SIZE);
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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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ops->ad(state, src, left);
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src += left & ~(MORUS640_BLOCK_SIZE - 1);
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left &= MORUS640_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, MORUS640_BLOCK_SIZE - pos);
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ops->ad(state, buf.bytes, MORUS640_BLOCK_SIZE);
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}
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}
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static void crypto_morus640_glue_process_crypt(struct morus640_state *state,
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struct morus640_ops ops,
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struct skcipher_walk *walk)
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{
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while (walk->nbytes >= MORUS640_BLOCK_SIZE) {
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ops.crypt_blocks(state, walk->src.virt.addr,
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walk->dst.virt.addr,
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round_down(walk->nbytes, MORUS640_BLOCK_SIZE));
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skcipher_walk_done(walk, walk->nbytes % MORUS640_BLOCK_SIZE);
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}
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if (walk->nbytes) {
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ops.crypt_tail(state, walk->src.virt.addr, walk->dst.virt.addr,
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walk->nbytes);
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skcipher_walk_done(walk, 0);
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}
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}
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int crypto_morus640_glue_setkey(struct crypto_aead *aead, const u8 *key,
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unsigned int keylen)
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{
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struct morus640_ctx *ctx = crypto_aead_ctx(aead);
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if (keylen != MORUS640_BLOCK_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, MORUS640_BLOCK_SIZE);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_morus640_glue_setkey);
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int crypto_morus640_glue_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
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}
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EXPORT_SYMBOL_GPL(crypto_morus640_glue_setauthsize);
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static void crypto_morus640_glue_crypt(struct aead_request *req,
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struct morus640_ops ops,
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unsigned int cryptlen,
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struct morus640_block *tag_xor)
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{
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
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struct morus640_state state;
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struct skcipher_walk walk;
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ops.skcipher_walk_init(&walk, req, true);
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kernel_fpu_begin();
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ctx->ops->init(&state, &ctx->key, req->iv);
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crypto_morus640_glue_process_ad(&state, ctx->ops, req->src, req->assoclen);
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crypto_morus640_glue_process_crypt(&state, ops, &walk);
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ctx->ops->final(&state, tag_xor, req->assoclen, cryptlen);
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kernel_fpu_end();
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}
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int crypto_morus640_glue_encrypt(struct aead_request *req)
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{
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
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struct morus640_ops OPS = {
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.skcipher_walk_init = skcipher_walk_aead_encrypt,
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.crypt_blocks = ctx->ops->enc,
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.crypt_tail = ctx->ops->enc_tail,
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};
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struct morus640_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_morus640_glue_crypt(req, OPS, cryptlen, &tag);
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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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EXPORT_SYMBOL_GPL(crypto_morus640_glue_encrypt);
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int crypto_morus640_glue_decrypt(struct aead_request *req)
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{
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static const u8 zeros[MORUS640_BLOCK_SIZE] = {};
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
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struct morus640_ops OPS = {
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.skcipher_walk_init = skcipher_walk_aead_decrypt,
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.crypt_blocks = ctx->ops->dec,
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.crypt_tail = ctx->ops->dec_tail,
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};
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struct morus640_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_morus640_glue_crypt(req, OPS, cryptlen, &tag);
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return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
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}
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EXPORT_SYMBOL_GPL(crypto_morus640_glue_decrypt);
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void crypto_morus640_glue_init_ops(struct crypto_aead *aead,
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const struct morus640_glue_ops *ops)
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{
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struct morus640_ctx *ctx = crypto_aead_ctx(aead);
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ctx->ops = ops;
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}
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EXPORT_SYMBOL_GPL(crypto_morus640_glue_init_ops);
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int cryptd_morus640_glue_setkey(struct crypto_aead *aead, const u8 *key,
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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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EXPORT_SYMBOL_GPL(cryptd_morus640_glue_setkey);
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int cryptd_morus640_glue_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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EXPORT_SYMBOL_GPL(cryptd_morus640_glue_setauthsize);
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int cryptd_morus640_glue_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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EXPORT_SYMBOL_GPL(cryptd_morus640_glue_encrypt);
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int cryptd_morus640_glue_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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EXPORT_SYMBOL_GPL(cryptd_morus640_glue_decrypt);
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int cryptd_morus640_glue_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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const char *name = crypto_aead_alg(aead)->base.cra_driver_name;
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char internal_name[CRYPTO_MAX_ALG_NAME];
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if (snprintf(internal_name, CRYPTO_MAX_ALG_NAME, "__%s", name)
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>= CRYPTO_MAX_ALG_NAME)
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return -ENAMETOOLONG;
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cryptd_tfm = cryptd_alloc_aead(internal_name, 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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EXPORT_SYMBOL_GPL(cryptd_morus640_glue_init_tfm);
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void cryptd_morus640_glue_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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EXPORT_SYMBOL_GPL(cryptd_morus640_glue_exit_tfm);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
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MODULE_DESCRIPTION("MORUS-640 AEAD mode -- glue for x86 optimizations");
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