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![Davidlohr Bueso](/assets/img/avatar_default.png)
Signed-off-by: Davidlohr Bueso <dave@gnu.org> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
663 lines
16 KiB
C
663 lines
16 KiB
C
/*
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* Asynchronous block chaining cipher operations.
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*
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* This is the asynchronous version of blkcipher.c indicating completion
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* via a callback.
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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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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*/
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#include <crypto/internal/skcipher.h>
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#include <linux/cpumask.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/rtnetlink.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include <crypto/scatterwalk.h>
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#include "internal.h"
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static const char *skcipher_default_geniv __read_mostly;
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struct ablkcipher_buffer {
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struct list_head entry;
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struct scatter_walk dst;
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unsigned int len;
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void *data;
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};
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enum {
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ABLKCIPHER_WALK_SLOW = 1 << 0,
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};
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static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
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{
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scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
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}
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void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
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{
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struct ablkcipher_buffer *p, *tmp;
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list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
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ablkcipher_buffer_write(p);
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list_del(&p->entry);
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kfree(p);
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}
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}
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EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);
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static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
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struct ablkcipher_buffer *p)
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{
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p->dst = walk->out;
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list_add_tail(&p->entry, &walk->buffers);
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}
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/* Get a spot of the specified length that does not straddle a page.
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* The caller needs to ensure that there is enough space for this operation.
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*/
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static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len)
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{
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u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
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return max(start, end_page);
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}
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static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,
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unsigned int bsize)
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{
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unsigned int n = bsize;
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for (;;) {
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unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
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if (len_this_page > n)
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len_this_page = n;
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scatterwalk_advance(&walk->out, n);
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if (n == len_this_page)
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break;
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n -= len_this_page;
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scatterwalk_start(&walk->out, scatterwalk_sg_next(walk->out.sg));
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}
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return bsize;
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}
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static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk,
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unsigned int n)
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{
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scatterwalk_advance(&walk->in, n);
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scatterwalk_advance(&walk->out, n);
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return n;
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}
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static int ablkcipher_walk_next(struct ablkcipher_request *req,
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struct ablkcipher_walk *walk);
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int ablkcipher_walk_done(struct ablkcipher_request *req,
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struct ablkcipher_walk *walk, int err)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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unsigned int nbytes = 0;
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if (likely(err >= 0)) {
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unsigned int n = walk->nbytes - err;
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if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW)))
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n = ablkcipher_done_fast(walk, n);
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else if (WARN_ON(err)) {
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err = -EINVAL;
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goto err;
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} else
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n = ablkcipher_done_slow(walk, n);
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nbytes = walk->total - n;
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err = 0;
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}
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scatterwalk_done(&walk->in, 0, nbytes);
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scatterwalk_done(&walk->out, 1, nbytes);
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err:
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walk->total = nbytes;
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walk->nbytes = nbytes;
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if (nbytes) {
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crypto_yield(req->base.flags);
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return ablkcipher_walk_next(req, walk);
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}
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if (walk->iv != req->info)
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memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
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kfree(walk->iv_buffer);
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return err;
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}
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EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
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static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
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struct ablkcipher_walk *walk,
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unsigned int bsize,
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unsigned int alignmask,
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void **src_p, void **dst_p)
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{
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unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
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struct ablkcipher_buffer *p;
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void *src, *dst, *base;
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unsigned int n;
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n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
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n += (aligned_bsize * 3 - (alignmask + 1) +
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(alignmask & ~(crypto_tfm_ctx_alignment() - 1)));
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p = kmalloc(n, GFP_ATOMIC);
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if (!p)
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return ablkcipher_walk_done(req, walk, -ENOMEM);
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base = p + 1;
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dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
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src = dst = ablkcipher_get_spot(dst, bsize);
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p->len = bsize;
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p->data = dst;
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scatterwalk_copychunks(src, &walk->in, bsize, 0);
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ablkcipher_queue_write(walk, p);
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walk->nbytes = bsize;
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walk->flags |= ABLKCIPHER_WALK_SLOW;
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*src_p = src;
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*dst_p = dst;
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return 0;
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}
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static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
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struct crypto_tfm *tfm,
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unsigned int alignmask)
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{
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unsigned bs = walk->blocksize;
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unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
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unsigned aligned_bs = ALIGN(bs, alignmask + 1);
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unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
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(alignmask + 1);
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u8 *iv;
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size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
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walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
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if (!walk->iv_buffer)
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return -ENOMEM;
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iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
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iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
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iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
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iv = ablkcipher_get_spot(iv, ivsize);
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walk->iv = memcpy(iv, walk->iv, ivsize);
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return 0;
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}
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static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
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struct ablkcipher_walk *walk)
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{
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walk->src.page = scatterwalk_page(&walk->in);
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walk->src.offset = offset_in_page(walk->in.offset);
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walk->dst.page = scatterwalk_page(&walk->out);
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walk->dst.offset = offset_in_page(walk->out.offset);
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return 0;
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}
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static int ablkcipher_walk_next(struct ablkcipher_request *req,
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struct ablkcipher_walk *walk)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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unsigned int alignmask, bsize, n;
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void *src, *dst;
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int err;
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alignmask = crypto_tfm_alg_alignmask(tfm);
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n = walk->total;
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if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
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req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
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return ablkcipher_walk_done(req, walk, -EINVAL);
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}
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walk->flags &= ~ABLKCIPHER_WALK_SLOW;
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src = dst = NULL;
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bsize = min(walk->blocksize, n);
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n = scatterwalk_clamp(&walk->in, n);
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n = scatterwalk_clamp(&walk->out, n);
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if (n < bsize ||
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!scatterwalk_aligned(&walk->in, alignmask) ||
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!scatterwalk_aligned(&walk->out, alignmask)) {
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err = ablkcipher_next_slow(req, walk, bsize, alignmask,
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&src, &dst);
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goto set_phys_lowmem;
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}
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walk->nbytes = n;
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return ablkcipher_next_fast(req, walk);
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set_phys_lowmem:
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if (err >= 0) {
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walk->src.page = virt_to_page(src);
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walk->dst.page = virt_to_page(dst);
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walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
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walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
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}
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return err;
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}
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static int ablkcipher_walk_first(struct ablkcipher_request *req,
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struct ablkcipher_walk *walk)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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unsigned int alignmask;
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alignmask = crypto_tfm_alg_alignmask(tfm);
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if (WARN_ON_ONCE(in_irq()))
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return -EDEADLK;
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walk->nbytes = walk->total;
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if (unlikely(!walk->total))
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return 0;
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walk->iv_buffer = NULL;
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walk->iv = req->info;
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if (unlikely(((unsigned long)walk->iv & alignmask))) {
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int err = ablkcipher_copy_iv(walk, tfm, alignmask);
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if (err)
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return err;
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}
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scatterwalk_start(&walk->in, walk->in.sg);
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scatterwalk_start(&walk->out, walk->out.sg);
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return ablkcipher_walk_next(req, walk);
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}
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int ablkcipher_walk_phys(struct ablkcipher_request *req,
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struct ablkcipher_walk *walk)
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{
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walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
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return ablkcipher_walk_first(req, walk);
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}
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EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);
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static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
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unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
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int ret;
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u8 *buffer, *alignbuffer;
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unsigned long absize;
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absize = keylen + alignmask;
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buffer = kmalloc(absize, GFP_ATOMIC);
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if (!buffer)
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return -ENOMEM;
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alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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memcpy(alignbuffer, key, keylen);
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ret = cipher->setkey(tfm, alignbuffer, keylen);
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memset(alignbuffer, 0, keylen);
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kfree(buffer);
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return ret;
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}
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static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
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unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
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if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
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crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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if ((unsigned long)key & alignmask)
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return setkey_unaligned(tfm, key, keylen);
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return cipher->setkey(tfm, key, keylen);
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}
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static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
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u32 mask)
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{
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return alg->cra_ctxsize;
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}
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int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
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{
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return crypto_ablkcipher_encrypt(&req->creq);
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}
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int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
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{
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return crypto_ablkcipher_decrypt(&req->creq);
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}
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static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
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u32 mask)
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{
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struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
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struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
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if (alg->ivsize > PAGE_SIZE / 8)
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return -EINVAL;
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crt->setkey = setkey;
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crt->encrypt = alg->encrypt;
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crt->decrypt = alg->decrypt;
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if (!alg->ivsize) {
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crt->givencrypt = skcipher_null_givencrypt;
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crt->givdecrypt = skcipher_null_givdecrypt;
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}
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crt->base = __crypto_ablkcipher_cast(tfm);
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crt->ivsize = alg->ivsize;
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return 0;
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}
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static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
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{
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struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
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seq_printf(m, "type : ablkcipher\n");
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seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
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"yes" : "no");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
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seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
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seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
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seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
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}
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const struct crypto_type crypto_ablkcipher_type = {
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.ctxsize = crypto_ablkcipher_ctxsize,
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.init = crypto_init_ablkcipher_ops,
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#ifdef CONFIG_PROC_FS
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.show = crypto_ablkcipher_show,
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#endif
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};
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EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
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static int no_givdecrypt(struct skcipher_givcrypt_request *req)
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{
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return -ENOSYS;
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}
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static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
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u32 mask)
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{
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struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
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struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
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if (alg->ivsize > PAGE_SIZE / 8)
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return -EINVAL;
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crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
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alg->setkey : setkey;
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crt->encrypt = alg->encrypt;
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crt->decrypt = alg->decrypt;
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crt->givencrypt = alg->givencrypt;
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crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
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crt->base = __crypto_ablkcipher_cast(tfm);
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crt->ivsize = alg->ivsize;
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return 0;
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}
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static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
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{
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struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
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seq_printf(m, "type : givcipher\n");
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seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
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"yes" : "no");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
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seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
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seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
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seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
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}
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const struct crypto_type crypto_givcipher_type = {
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.ctxsize = crypto_ablkcipher_ctxsize,
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.init = crypto_init_givcipher_ops,
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#ifdef CONFIG_PROC_FS
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.show = crypto_givcipher_show,
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#endif
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};
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EXPORT_SYMBOL_GPL(crypto_givcipher_type);
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const char *crypto_default_geniv(const struct crypto_alg *alg)
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{
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if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
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CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
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alg->cra_ablkcipher.ivsize) !=
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alg->cra_blocksize)
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return "chainiv";
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return alg->cra_flags & CRYPTO_ALG_ASYNC ?
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"eseqiv" : skcipher_default_geniv;
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}
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static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
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{
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struct rtattr *tb[3];
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struct {
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struct rtattr attr;
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struct crypto_attr_type data;
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} ptype;
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struct {
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struct rtattr attr;
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struct crypto_attr_alg data;
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} palg;
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struct crypto_template *tmpl;
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struct crypto_instance *inst;
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struct crypto_alg *larval;
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const char *geniv;
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int err;
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|
|
larval = crypto_larval_lookup(alg->cra_driver_name,
|
|
(type & ~CRYPTO_ALG_TYPE_MASK) |
|
|
CRYPTO_ALG_TYPE_GIVCIPHER,
|
|
mask | CRYPTO_ALG_TYPE_MASK);
|
|
err = PTR_ERR(larval);
|
|
if (IS_ERR(larval))
|
|
goto out;
|
|
|
|
err = -EAGAIN;
|
|
if (!crypto_is_larval(larval))
|
|
goto drop_larval;
|
|
|
|
ptype.attr.rta_len = sizeof(ptype);
|
|
ptype.attr.rta_type = CRYPTOA_TYPE;
|
|
ptype.data.type = type | CRYPTO_ALG_GENIV;
|
|
/* GENIV tells the template that we're making a default geniv. */
|
|
ptype.data.mask = mask | CRYPTO_ALG_GENIV;
|
|
tb[0] = &ptype.attr;
|
|
|
|
palg.attr.rta_len = sizeof(palg);
|
|
palg.attr.rta_type = CRYPTOA_ALG;
|
|
/* Must use the exact name to locate ourselves. */
|
|
memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
|
|
tb[1] = &palg.attr;
|
|
|
|
tb[2] = NULL;
|
|
|
|
if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
|
|
CRYPTO_ALG_TYPE_BLKCIPHER)
|
|
geniv = alg->cra_blkcipher.geniv;
|
|
else
|
|
geniv = alg->cra_ablkcipher.geniv;
|
|
|
|
if (!geniv)
|
|
geniv = crypto_default_geniv(alg);
|
|
|
|
tmpl = crypto_lookup_template(geniv);
|
|
err = -ENOENT;
|
|
if (!tmpl)
|
|
goto kill_larval;
|
|
|
|
inst = tmpl->alloc(tb);
|
|
err = PTR_ERR(inst);
|
|
if (IS_ERR(inst))
|
|
goto put_tmpl;
|
|
|
|
if ((err = crypto_register_instance(tmpl, inst))) {
|
|
tmpl->free(inst);
|
|
goto put_tmpl;
|
|
}
|
|
|
|
/* Redo the lookup to use the instance we just registered. */
|
|
err = -EAGAIN;
|
|
|
|
put_tmpl:
|
|
crypto_tmpl_put(tmpl);
|
|
kill_larval:
|
|
crypto_larval_kill(larval);
|
|
drop_larval:
|
|
crypto_mod_put(larval);
|
|
out:
|
|
crypto_mod_put(alg);
|
|
return err;
|
|
}
|
|
|
|
static struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type,
|
|
u32 mask)
|
|
{
|
|
struct crypto_alg *alg;
|
|
|
|
alg = crypto_alg_mod_lookup(name, type, mask);
|
|
if (IS_ERR(alg))
|
|
return alg;
|
|
|
|
if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
|
|
CRYPTO_ALG_TYPE_GIVCIPHER)
|
|
return alg;
|
|
|
|
if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
|
|
CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
|
|
alg->cra_ablkcipher.ivsize))
|
|
return alg;
|
|
|
|
crypto_mod_put(alg);
|
|
alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
|
|
mask & ~CRYPTO_ALG_TESTED);
|
|
if (IS_ERR(alg))
|
|
return alg;
|
|
|
|
if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
|
|
CRYPTO_ALG_TYPE_GIVCIPHER) {
|
|
if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
|
|
crypto_mod_put(alg);
|
|
alg = ERR_PTR(-ENOENT);
|
|
}
|
|
return alg;
|
|
}
|
|
|
|
BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
|
|
CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
|
|
alg->cra_ablkcipher.ivsize));
|
|
|
|
return ERR_PTR(crypto_givcipher_default(alg, type, mask));
|
|
}
|
|
|
|
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
|
|
u32 type, u32 mask)
|
|
{
|
|
struct crypto_alg *alg;
|
|
int err;
|
|
|
|
type = crypto_skcipher_type(type);
|
|
mask = crypto_skcipher_mask(mask);
|
|
|
|
alg = crypto_lookup_skcipher(name, type, mask);
|
|
if (IS_ERR(alg))
|
|
return PTR_ERR(alg);
|
|
|
|
err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
|
|
crypto_mod_put(alg);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
|
|
|
|
struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
|
|
u32 type, u32 mask)
|
|
{
|
|
struct crypto_tfm *tfm;
|
|
int err;
|
|
|
|
type = crypto_skcipher_type(type);
|
|
mask = crypto_skcipher_mask(mask);
|
|
|
|
for (;;) {
|
|
struct crypto_alg *alg;
|
|
|
|
alg = crypto_lookup_skcipher(alg_name, type, mask);
|
|
if (IS_ERR(alg)) {
|
|
err = PTR_ERR(alg);
|
|
goto err;
|
|
}
|
|
|
|
tfm = __crypto_alloc_tfm(alg, type, mask);
|
|
if (!IS_ERR(tfm))
|
|
return __crypto_ablkcipher_cast(tfm);
|
|
|
|
crypto_mod_put(alg);
|
|
err = PTR_ERR(tfm);
|
|
|
|
err:
|
|
if (err != -EAGAIN)
|
|
break;
|
|
if (signal_pending(current)) {
|
|
err = -EINTR;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);
|
|
|
|
static int __init skcipher_module_init(void)
|
|
{
|
|
skcipher_default_geniv = num_possible_cpus() > 1 ?
|
|
"eseqiv" : "chainiv";
|
|
return 0;
|
|
}
|
|
|
|
static void skcipher_module_exit(void)
|
|
{
|
|
}
|
|
|
|
module_init(skcipher_module_init);
|
|
module_exit(skcipher_module_exit);
|