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![Eric Biggers](/assets/img/avatar_default.png)
Remove support for the "Crypto usage statistics" feature (CONFIG_CRYPTO_STATS). This feature does not appear to have ever been used, and it is harmful because it significantly reduces performance and is a large maintenance burden. Covering each of these points in detail: 1. Feature is not being used Since these generic crypto statistics are only readable using netlink, it's fairly straightforward to look for programs that use them. I'm unable to find any evidence that any such programs exist. For example, Debian Code Search returns no hits except the kernel header and kernel code itself and translations of the kernel header: https://codesearch.debian.net/search?q=CRYPTOCFGA_STAT&literal=1&perpkg=1 The patch series that added this feature in 2018 (https://lore.kernel.org/linux-crypto/1537351855-16618-1-git-send-email-clabbe@baylibre.com/) said "The goal is to have an ifconfig for crypto device." This doesn't appear to have happened. It's not clear that there is real demand for crypto statistics. Just because the kernel provides other types of statistics such as I/O and networking statistics and some people find those useful does not mean that crypto statistics are useful too. Further evidence that programs are not using CONFIG_CRYPTO_STATS is that it was able to be disabled in RHEL and Fedora as a bug fix (https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/2947). Even further evidence comes from the fact that there are and have been bugs in how the stats work, but they were never reported. For example, before Linux v6.7 hash stats were double-counted in most cases. There has also never been any documentation for this feature, so it might be hard to use even if someone wanted to. 2. CONFIG_CRYPTO_STATS significantly reduces performance Enabling CONFIG_CRYPTO_STATS significantly reduces the performance of the crypto API, even if no program ever retrieves the statistics. This primarily affects systems with a large number of CPUs. For example, https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2039576 reported that Lustre client encryption performance improved from 21.7GB/s to 48.2GB/s by disabling CONFIG_CRYPTO_STATS. It can be argued that this means that CONFIG_CRYPTO_STATS should be optimized with per-cpu counters similar to many of the networking counters. But no one has done this in 5+ years. This is consistent with the fact that the feature appears to be unused, so there seems to be little interest in improving it as opposed to just disabling it. It can be argued that because CONFIG_CRYPTO_STATS is off by default, performance doesn't matter. But Linux distros tend to error on the side of enabling options. The option is enabled in Ubuntu and Arch Linux, and until recently was enabled in RHEL and Fedora (see above). So, even just having the option available is harmful to users. 3. CONFIG_CRYPTO_STATS is a large maintenance burden There are over 1000 lines of code associated with CONFIG_CRYPTO_STATS, spread among 32 files. It significantly complicates much of the implementation of the crypto API. After the initial submission, many fixes and refactorings have consumed effort of multiple people to keep this feature "working". We should be spending this effort elsewhere. Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Corentin Labbe <clabbe@baylibre.com> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
1089 lines
28 KiB
C
1089 lines
28 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Symmetric key cipher operations.
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*
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* Generic encrypt/decrypt wrapper for ciphers, handles operations across
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* multiple page boundaries by using temporary blocks. In user context,
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* the kernel is given a chance to schedule us once per page.
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*
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* Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <crypto/internal/aead.h>
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#include <crypto/internal/cipher.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <linux/bug.h>
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#include <linux/cryptouser.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <net/netlink.h>
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#include "skcipher.h"
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#define CRYPTO_ALG_TYPE_SKCIPHER_MASK 0x0000000e
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enum {
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SKCIPHER_WALK_PHYS = 1 << 0,
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SKCIPHER_WALK_SLOW = 1 << 1,
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SKCIPHER_WALK_COPY = 1 << 2,
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SKCIPHER_WALK_DIFF = 1 << 3,
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SKCIPHER_WALK_SLEEP = 1 << 4,
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};
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struct skcipher_walk_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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u8 *data;
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u8 buffer[];
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};
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static const struct crypto_type crypto_skcipher_type;
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static int skcipher_walk_next(struct skcipher_walk *walk);
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static inline void skcipher_map_src(struct skcipher_walk *walk)
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{
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walk->src.virt.addr = scatterwalk_map(&walk->in);
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}
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static inline void skcipher_map_dst(struct skcipher_walk *walk)
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{
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walk->dst.virt.addr = scatterwalk_map(&walk->out);
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}
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static inline void skcipher_unmap_src(struct skcipher_walk *walk)
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{
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scatterwalk_unmap(walk->src.virt.addr);
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}
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static inline void skcipher_unmap_dst(struct skcipher_walk *walk)
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{
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scatterwalk_unmap(walk->dst.virt.addr);
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}
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static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk)
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{
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return walk->flags & SKCIPHER_WALK_SLEEP ? GFP_KERNEL : GFP_ATOMIC;
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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 *skcipher_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 struct skcipher_alg *__crypto_skcipher_alg(
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struct crypto_alg *alg)
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{
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return container_of(alg, struct skcipher_alg, base);
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}
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static int skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize)
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{
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u8 *addr;
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addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
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addr = skcipher_get_spot(addr, bsize);
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scatterwalk_copychunks(addr, &walk->out, bsize,
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(walk->flags & SKCIPHER_WALK_PHYS) ? 2 : 1);
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return 0;
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}
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int skcipher_walk_done(struct skcipher_walk *walk, int err)
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{
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unsigned int n = walk->nbytes;
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unsigned int nbytes = 0;
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if (!n)
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goto finish;
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if (likely(err >= 0)) {
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n -= err;
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nbytes = walk->total - n;
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}
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if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS |
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SKCIPHER_WALK_SLOW |
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SKCIPHER_WALK_COPY |
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SKCIPHER_WALK_DIFF)))) {
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unmap_src:
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skcipher_unmap_src(walk);
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} else if (walk->flags & SKCIPHER_WALK_DIFF) {
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skcipher_unmap_dst(walk);
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goto unmap_src;
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} else if (walk->flags & SKCIPHER_WALK_COPY) {
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skcipher_map_dst(walk);
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memcpy(walk->dst.virt.addr, walk->page, n);
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skcipher_unmap_dst(walk);
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} else if (unlikely(walk->flags & SKCIPHER_WALK_SLOW)) {
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if (err > 0) {
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/*
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* Didn't process all bytes. Either the algorithm is
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* broken, or this was the last step and it turned out
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* the message wasn't evenly divisible into blocks but
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* the algorithm requires it.
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*/
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err = -EINVAL;
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nbytes = 0;
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} else
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n = skcipher_done_slow(walk, n);
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}
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if (err > 0)
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err = 0;
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walk->total = nbytes;
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walk->nbytes = 0;
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scatterwalk_advance(&walk->in, n);
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scatterwalk_advance(&walk->out, n);
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scatterwalk_done(&walk->in, 0, nbytes);
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scatterwalk_done(&walk->out, 1, nbytes);
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if (nbytes) {
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crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ?
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CRYPTO_TFM_REQ_MAY_SLEEP : 0);
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return skcipher_walk_next(walk);
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}
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finish:
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/* Short-circuit for the common/fast path. */
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if (!((unsigned long)walk->buffer | (unsigned long)walk->page))
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goto out;
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if (walk->flags & SKCIPHER_WALK_PHYS)
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goto out;
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if (walk->iv != walk->oiv)
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memcpy(walk->oiv, walk->iv, walk->ivsize);
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if (walk->buffer != walk->page)
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kfree(walk->buffer);
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if (walk->page)
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free_page((unsigned long)walk->page);
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out:
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return err;
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}
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EXPORT_SYMBOL_GPL(skcipher_walk_done);
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void skcipher_walk_complete(struct skcipher_walk *walk, int err)
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{
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struct skcipher_walk_buffer *p, *tmp;
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list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
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u8 *data;
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if (err)
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goto done;
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data = p->data;
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if (!data) {
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data = PTR_ALIGN(&p->buffer[0], walk->alignmask + 1);
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data = skcipher_get_spot(data, walk->stride);
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}
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scatterwalk_copychunks(data, &p->dst, p->len, 1);
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if (offset_in_page(p->data) + p->len + walk->stride >
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PAGE_SIZE)
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free_page((unsigned long)p->data);
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done:
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list_del(&p->entry);
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kfree(p);
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}
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if (!err && walk->iv != walk->oiv)
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memcpy(walk->oiv, walk->iv, walk->ivsize);
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if (walk->buffer != walk->page)
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kfree(walk->buffer);
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if (walk->page)
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free_page((unsigned long)walk->page);
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}
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EXPORT_SYMBOL_GPL(skcipher_walk_complete);
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static void skcipher_queue_write(struct skcipher_walk *walk,
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struct skcipher_walk_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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static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize)
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{
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bool phys = walk->flags & SKCIPHER_WALK_PHYS;
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unsigned alignmask = walk->alignmask;
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struct skcipher_walk_buffer *p;
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unsigned a;
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unsigned n;
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u8 *buffer;
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void *v;
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if (!phys) {
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if (!walk->buffer)
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walk->buffer = walk->page;
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buffer = walk->buffer;
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if (buffer)
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goto ok;
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}
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/* Start with the minimum alignment of kmalloc. */
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a = crypto_tfm_ctx_alignment() - 1;
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n = bsize;
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if (phys) {
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/* Calculate the minimum alignment of p->buffer. */
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a &= (sizeof(*p) ^ (sizeof(*p) - 1)) >> 1;
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n += sizeof(*p);
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}
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/* Minimum size to align p->buffer by alignmask. */
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n += alignmask & ~a;
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/* Minimum size to ensure p->buffer does not straddle a page. */
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n += (bsize - 1) & ~(alignmask | a);
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v = kzalloc(n, skcipher_walk_gfp(walk));
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if (!v)
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return skcipher_walk_done(walk, -ENOMEM);
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if (phys) {
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p = v;
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p->len = bsize;
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skcipher_queue_write(walk, p);
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buffer = p->buffer;
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} else {
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walk->buffer = v;
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buffer = v;
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}
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ok:
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walk->dst.virt.addr = PTR_ALIGN(buffer, alignmask + 1);
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walk->dst.virt.addr = skcipher_get_spot(walk->dst.virt.addr, bsize);
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walk->src.virt.addr = walk->dst.virt.addr;
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scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
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walk->nbytes = bsize;
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walk->flags |= SKCIPHER_WALK_SLOW;
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return 0;
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}
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static int skcipher_next_copy(struct skcipher_walk *walk)
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{
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struct skcipher_walk_buffer *p;
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u8 *tmp = walk->page;
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skcipher_map_src(walk);
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memcpy(tmp, walk->src.virt.addr, walk->nbytes);
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skcipher_unmap_src(walk);
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walk->src.virt.addr = tmp;
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walk->dst.virt.addr = tmp;
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if (!(walk->flags & SKCIPHER_WALK_PHYS))
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return 0;
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p = kmalloc(sizeof(*p), skcipher_walk_gfp(walk));
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if (!p)
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return -ENOMEM;
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p->data = walk->page;
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p->len = walk->nbytes;
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skcipher_queue_write(walk, p);
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if (offset_in_page(walk->page) + walk->nbytes + walk->stride >
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PAGE_SIZE)
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walk->page = NULL;
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else
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walk->page += walk->nbytes;
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return 0;
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}
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static int skcipher_next_fast(struct skcipher_walk *walk)
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{
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unsigned long diff;
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walk->src.phys.page = scatterwalk_page(&walk->in);
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walk->src.phys.offset = offset_in_page(walk->in.offset);
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walk->dst.phys.page = scatterwalk_page(&walk->out);
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walk->dst.phys.offset = offset_in_page(walk->out.offset);
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if (walk->flags & SKCIPHER_WALK_PHYS)
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return 0;
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diff = walk->src.phys.offset - walk->dst.phys.offset;
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diff |= walk->src.virt.page - walk->dst.virt.page;
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skcipher_map_src(walk);
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walk->dst.virt.addr = walk->src.virt.addr;
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if (diff) {
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walk->flags |= SKCIPHER_WALK_DIFF;
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skcipher_map_dst(walk);
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}
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return 0;
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}
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static int skcipher_walk_next(struct skcipher_walk *walk)
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{
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unsigned int bsize;
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unsigned int n;
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int err;
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walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY |
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SKCIPHER_WALK_DIFF);
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n = walk->total;
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bsize = min(walk->stride, max(n, walk->blocksize));
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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 (unlikely(n < bsize)) {
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if (unlikely(walk->total < walk->blocksize))
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return skcipher_walk_done(walk, -EINVAL);
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slow_path:
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err = skcipher_next_slow(walk, bsize);
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goto set_phys_lowmem;
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}
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if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) {
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if (!walk->page) {
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gfp_t gfp = skcipher_walk_gfp(walk);
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walk->page = (void *)__get_free_page(gfp);
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if (!walk->page)
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goto slow_path;
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}
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walk->nbytes = min_t(unsigned, n,
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PAGE_SIZE - offset_in_page(walk->page));
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walk->flags |= SKCIPHER_WALK_COPY;
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err = skcipher_next_copy(walk);
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goto set_phys_lowmem;
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}
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walk->nbytes = n;
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return skcipher_next_fast(walk);
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set_phys_lowmem:
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if (!err && (walk->flags & SKCIPHER_WALK_PHYS)) {
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walk->src.phys.page = virt_to_page(walk->src.virt.addr);
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walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
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walk->src.phys.offset &= PAGE_SIZE - 1;
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walk->dst.phys.offset &= PAGE_SIZE - 1;
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}
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return err;
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}
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static int skcipher_copy_iv(struct skcipher_walk *walk)
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{
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unsigned a = crypto_tfm_ctx_alignment() - 1;
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unsigned alignmask = walk->alignmask;
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unsigned ivsize = walk->ivsize;
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unsigned bs = walk->stride;
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unsigned aligned_bs;
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unsigned size;
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u8 *iv;
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aligned_bs = ALIGN(bs, alignmask + 1);
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/* Minimum size to align buffer by alignmask. */
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size = alignmask & ~a;
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if (walk->flags & SKCIPHER_WALK_PHYS)
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size += ivsize;
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else {
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size += aligned_bs + ivsize;
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/* Minimum size to ensure buffer does not straddle a page. */
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size += (bs - 1) & ~(alignmask | a);
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}
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walk->buffer = kmalloc(size, skcipher_walk_gfp(walk));
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if (!walk->buffer)
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return -ENOMEM;
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iv = PTR_ALIGN(walk->buffer, alignmask + 1);
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iv = skcipher_get_spot(iv, bs) + aligned_bs;
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walk->iv = memcpy(iv, walk->iv, walk->ivsize);
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return 0;
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}
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static int skcipher_walk_first(struct skcipher_walk *walk)
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{
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if (WARN_ON_ONCE(in_hardirq()))
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return -EDEADLK;
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|
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walk->buffer = NULL;
|
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if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
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int err = skcipher_copy_iv(walk);
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if (err)
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return err;
|
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}
|
|
|
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walk->page = NULL;
|
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|
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return skcipher_walk_next(walk);
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}
|
|
|
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static int skcipher_walk_skcipher(struct skcipher_walk *walk,
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struct skcipher_request *req)
|
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{
|
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
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struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
|
|
|
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walk->total = req->cryptlen;
|
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walk->nbytes = 0;
|
|
walk->iv = req->iv;
|
|
walk->oiv = req->iv;
|
|
|
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if (unlikely(!walk->total))
|
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return 0;
|
|
|
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scatterwalk_start(&walk->in, req->src);
|
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scatterwalk_start(&walk->out, req->dst);
|
|
|
|
walk->flags &= ~SKCIPHER_WALK_SLEEP;
|
|
walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
|
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SKCIPHER_WALK_SLEEP : 0;
|
|
|
|
walk->blocksize = crypto_skcipher_blocksize(tfm);
|
|
walk->ivsize = crypto_skcipher_ivsize(tfm);
|
|
walk->alignmask = crypto_skcipher_alignmask(tfm);
|
|
|
|
if (alg->co.base.cra_type != &crypto_skcipher_type)
|
|
walk->stride = alg->co.chunksize;
|
|
else
|
|
walk->stride = alg->walksize;
|
|
|
|
return skcipher_walk_first(walk);
|
|
}
|
|
|
|
int skcipher_walk_virt(struct skcipher_walk *walk,
|
|
struct skcipher_request *req, bool atomic)
|
|
{
|
|
int err;
|
|
|
|
might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
|
|
|
|
walk->flags &= ~SKCIPHER_WALK_PHYS;
|
|
|
|
err = skcipher_walk_skcipher(walk, req);
|
|
|
|
walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0;
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_walk_virt);
|
|
|
|
int skcipher_walk_async(struct skcipher_walk *walk,
|
|
struct skcipher_request *req)
|
|
{
|
|
walk->flags |= SKCIPHER_WALK_PHYS;
|
|
|
|
INIT_LIST_HEAD(&walk->buffers);
|
|
|
|
return skcipher_walk_skcipher(walk, req);
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_walk_async);
|
|
|
|
static int skcipher_walk_aead_common(struct skcipher_walk *walk,
|
|
struct aead_request *req, bool atomic)
|
|
{
|
|
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
|
|
int err;
|
|
|
|
walk->nbytes = 0;
|
|
walk->iv = req->iv;
|
|
walk->oiv = req->iv;
|
|
|
|
if (unlikely(!walk->total))
|
|
return 0;
|
|
|
|
walk->flags &= ~SKCIPHER_WALK_PHYS;
|
|
|
|
scatterwalk_start(&walk->in, req->src);
|
|
scatterwalk_start(&walk->out, req->dst);
|
|
|
|
scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2);
|
|
scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2);
|
|
|
|
scatterwalk_done(&walk->in, 0, walk->total);
|
|
scatterwalk_done(&walk->out, 0, walk->total);
|
|
|
|
if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP)
|
|
walk->flags |= SKCIPHER_WALK_SLEEP;
|
|
else
|
|
walk->flags &= ~SKCIPHER_WALK_SLEEP;
|
|
|
|
walk->blocksize = crypto_aead_blocksize(tfm);
|
|
walk->stride = crypto_aead_chunksize(tfm);
|
|
walk->ivsize = crypto_aead_ivsize(tfm);
|
|
walk->alignmask = crypto_aead_alignmask(tfm);
|
|
|
|
err = skcipher_walk_first(walk);
|
|
|
|
if (atomic)
|
|
walk->flags &= ~SKCIPHER_WALK_SLEEP;
|
|
|
|
return err;
|
|
}
|
|
|
|
int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
|
|
struct aead_request *req, bool atomic)
|
|
{
|
|
walk->total = req->cryptlen;
|
|
|
|
return skcipher_walk_aead_common(walk, req, atomic);
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt);
|
|
|
|
int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
|
|
struct aead_request *req, bool atomic)
|
|
{
|
|
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
|
|
|
|
walk->total = req->cryptlen - crypto_aead_authsize(tfm);
|
|
|
|
return skcipher_walk_aead_common(walk, req, atomic);
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt);
|
|
|
|
static void skcipher_set_needkey(struct crypto_skcipher *tfm)
|
|
{
|
|
if (crypto_skcipher_max_keysize(tfm) != 0)
|
|
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
|
|
}
|
|
|
|
static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm,
|
|
const u8 *key, unsigned int keylen)
|
|
{
|
|
unsigned long alignmask = crypto_skcipher_alignmask(tfm);
|
|
struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
|
|
u8 *buffer, *alignbuffer;
|
|
unsigned long absize;
|
|
int ret;
|
|
|
|
absize = keylen + alignmask;
|
|
buffer = kmalloc(absize, GFP_ATOMIC);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
|
|
memcpy(alignbuffer, key, keylen);
|
|
ret = cipher->setkey(tfm, alignbuffer, keylen);
|
|
kfree_sensitive(buffer);
|
|
return ret;
|
|
}
|
|
|
|
int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
|
|
unsigned long alignmask = crypto_skcipher_alignmask(tfm);
|
|
int err;
|
|
|
|
if (cipher->co.base.cra_type != &crypto_skcipher_type) {
|
|
struct crypto_lskcipher **ctx = crypto_skcipher_ctx(tfm);
|
|
|
|
crypto_lskcipher_clear_flags(*ctx, CRYPTO_TFM_REQ_MASK);
|
|
crypto_lskcipher_set_flags(*ctx,
|
|
crypto_skcipher_get_flags(tfm) &
|
|
CRYPTO_TFM_REQ_MASK);
|
|
err = crypto_lskcipher_setkey(*ctx, key, keylen);
|
|
goto out;
|
|
}
|
|
|
|
if (keylen < cipher->min_keysize || keylen > cipher->max_keysize)
|
|
return -EINVAL;
|
|
|
|
if ((unsigned long)key & alignmask)
|
|
err = skcipher_setkey_unaligned(tfm, key, keylen);
|
|
else
|
|
err = cipher->setkey(tfm, key, keylen);
|
|
|
|
out:
|
|
if (unlikely(err)) {
|
|
skcipher_set_needkey(tfm);
|
|
return err;
|
|
}
|
|
|
|
crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_skcipher_setkey);
|
|
|
|
int crypto_skcipher_encrypt(struct skcipher_request *req)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
|
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
|
|
|
|
if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
|
|
return -ENOKEY;
|
|
if (alg->co.base.cra_type != &crypto_skcipher_type)
|
|
return crypto_lskcipher_encrypt_sg(req);
|
|
return alg->encrypt(req);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_skcipher_encrypt);
|
|
|
|
int crypto_skcipher_decrypt(struct skcipher_request *req)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
|
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
|
|
|
|
if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
|
|
return -ENOKEY;
|
|
if (alg->co.base.cra_type != &crypto_skcipher_type)
|
|
return crypto_lskcipher_decrypt_sg(req);
|
|
return alg->decrypt(req);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_skcipher_decrypt);
|
|
|
|
static int crypto_lskcipher_export(struct skcipher_request *req, void *out)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
|
u8 *ivs = skcipher_request_ctx(req);
|
|
|
|
ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1);
|
|
|
|
memcpy(out, ivs + crypto_skcipher_ivsize(tfm),
|
|
crypto_skcipher_statesize(tfm));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_lskcipher_import(struct skcipher_request *req, const void *in)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
|
u8 *ivs = skcipher_request_ctx(req);
|
|
|
|
ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1);
|
|
|
|
memcpy(ivs + crypto_skcipher_ivsize(tfm), in,
|
|
crypto_skcipher_statesize(tfm));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int skcipher_noexport(struct skcipher_request *req, void *out)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int skcipher_noimport(struct skcipher_request *req, const void *in)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int crypto_skcipher_export(struct skcipher_request *req, void *out)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
|
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
|
|
|
|
if (alg->co.base.cra_type != &crypto_skcipher_type)
|
|
return crypto_lskcipher_export(req, out);
|
|
return alg->export(req, out);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_skcipher_export);
|
|
|
|
int crypto_skcipher_import(struct skcipher_request *req, const void *in)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
|
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
|
|
|
|
if (alg->co.base.cra_type != &crypto_skcipher_type)
|
|
return crypto_lskcipher_import(req, in);
|
|
return alg->import(req, in);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_skcipher_import);
|
|
|
|
static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
|
|
struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
|
|
|
|
alg->exit(skcipher);
|
|
}
|
|
|
|
static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
|
|
struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
|
|
|
|
skcipher_set_needkey(skcipher);
|
|
|
|
if (tfm->__crt_alg->cra_type != &crypto_skcipher_type) {
|
|
unsigned am = crypto_skcipher_alignmask(skcipher);
|
|
unsigned reqsize;
|
|
|
|
reqsize = am & ~(crypto_tfm_ctx_alignment() - 1);
|
|
reqsize += crypto_skcipher_ivsize(skcipher);
|
|
reqsize += crypto_skcipher_statesize(skcipher);
|
|
crypto_skcipher_set_reqsize(skcipher, reqsize);
|
|
|
|
return crypto_init_lskcipher_ops_sg(tfm);
|
|
}
|
|
|
|
if (alg->exit)
|
|
skcipher->base.exit = crypto_skcipher_exit_tfm;
|
|
|
|
if (alg->init)
|
|
return alg->init(skcipher);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg)
|
|
{
|
|
if (alg->cra_type != &crypto_skcipher_type)
|
|
return sizeof(struct crypto_lskcipher *);
|
|
|
|
return crypto_alg_extsize(alg);
|
|
}
|
|
|
|
static void crypto_skcipher_free_instance(struct crypto_instance *inst)
|
|
{
|
|
struct skcipher_instance *skcipher =
|
|
container_of(inst, struct skcipher_instance, s.base);
|
|
|
|
skcipher->free(skcipher);
|
|
}
|
|
|
|
static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
|
|
__maybe_unused;
|
|
static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
|
|
{
|
|
struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg);
|
|
|
|
seq_printf(m, "type : skcipher\n");
|
|
seq_printf(m, "async : %s\n",
|
|
alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no");
|
|
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
|
|
seq_printf(m, "min keysize : %u\n", skcipher->min_keysize);
|
|
seq_printf(m, "max keysize : %u\n", skcipher->max_keysize);
|
|
seq_printf(m, "ivsize : %u\n", skcipher->ivsize);
|
|
seq_printf(m, "chunksize : %u\n", skcipher->chunksize);
|
|
seq_printf(m, "walksize : %u\n", skcipher->walksize);
|
|
seq_printf(m, "statesize : %u\n", skcipher->statesize);
|
|
}
|
|
|
|
static int __maybe_unused crypto_skcipher_report(
|
|
struct sk_buff *skb, struct crypto_alg *alg)
|
|
{
|
|
struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg);
|
|
struct crypto_report_blkcipher rblkcipher;
|
|
|
|
memset(&rblkcipher, 0, sizeof(rblkcipher));
|
|
|
|
strscpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type));
|
|
strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv));
|
|
|
|
rblkcipher.blocksize = alg->cra_blocksize;
|
|
rblkcipher.min_keysize = skcipher->min_keysize;
|
|
rblkcipher.max_keysize = skcipher->max_keysize;
|
|
rblkcipher.ivsize = skcipher->ivsize;
|
|
|
|
return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
|
|
sizeof(rblkcipher), &rblkcipher);
|
|
}
|
|
|
|
static const struct crypto_type crypto_skcipher_type = {
|
|
.extsize = crypto_skcipher_extsize,
|
|
.init_tfm = crypto_skcipher_init_tfm,
|
|
.free = crypto_skcipher_free_instance,
|
|
#ifdef CONFIG_PROC_FS
|
|
.show = crypto_skcipher_show,
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_CRYPTO_USER)
|
|
.report = crypto_skcipher_report,
|
|
#endif
|
|
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
|
|
.maskset = CRYPTO_ALG_TYPE_SKCIPHER_MASK,
|
|
.type = CRYPTO_ALG_TYPE_SKCIPHER,
|
|
.tfmsize = offsetof(struct crypto_skcipher, base),
|
|
};
|
|
|
|
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn,
|
|
struct crypto_instance *inst,
|
|
const char *name, u32 type, u32 mask)
|
|
{
|
|
spawn->base.frontend = &crypto_skcipher_type;
|
|
return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
|
|
|
|
struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name,
|
|
u32 type, u32 mask)
|
|
{
|
|
return crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_alloc_skcipher);
|
|
|
|
struct crypto_sync_skcipher *crypto_alloc_sync_skcipher(
|
|
const char *alg_name, u32 type, u32 mask)
|
|
{
|
|
struct crypto_skcipher *tfm;
|
|
|
|
/* Only sync algorithms allowed. */
|
|
mask |= CRYPTO_ALG_ASYNC | CRYPTO_ALG_SKCIPHER_REQSIZE_LARGE;
|
|
|
|
tfm = crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask);
|
|
|
|
/*
|
|
* Make sure we do not allocate something that might get used with
|
|
* an on-stack request: check the request size.
|
|
*/
|
|
if (!IS_ERR(tfm) && WARN_ON(crypto_skcipher_reqsize(tfm) >
|
|
MAX_SYNC_SKCIPHER_REQSIZE)) {
|
|
crypto_free_skcipher(tfm);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
return (struct crypto_sync_skcipher *)tfm;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_alloc_sync_skcipher);
|
|
|
|
int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask)
|
|
{
|
|
return crypto_type_has_alg(alg_name, &crypto_skcipher_type, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_has_skcipher);
|
|
|
|
int skcipher_prepare_alg_common(struct skcipher_alg_common *alg)
|
|
{
|
|
struct crypto_alg *base = &alg->base;
|
|
|
|
if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 ||
|
|
alg->statesize > PAGE_SIZE / 2 ||
|
|
(alg->ivsize + alg->statesize) > PAGE_SIZE / 2)
|
|
return -EINVAL;
|
|
|
|
if (!alg->chunksize)
|
|
alg->chunksize = base->cra_blocksize;
|
|
|
|
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int skcipher_prepare_alg(struct skcipher_alg *alg)
|
|
{
|
|
struct crypto_alg *base = &alg->base;
|
|
int err;
|
|
|
|
err = skcipher_prepare_alg_common(&alg->co);
|
|
if (err)
|
|
return err;
|
|
|
|
if (alg->walksize > PAGE_SIZE / 8)
|
|
return -EINVAL;
|
|
|
|
if (!alg->walksize)
|
|
alg->walksize = alg->chunksize;
|
|
|
|
if (!alg->statesize) {
|
|
alg->import = skcipher_noimport;
|
|
alg->export = skcipher_noexport;
|
|
} else if (!(alg->import && alg->export))
|
|
return -EINVAL;
|
|
|
|
base->cra_type = &crypto_skcipher_type;
|
|
base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int crypto_register_skcipher(struct skcipher_alg *alg)
|
|
{
|
|
struct crypto_alg *base = &alg->base;
|
|
int err;
|
|
|
|
err = skcipher_prepare_alg(alg);
|
|
if (err)
|
|
return err;
|
|
|
|
return crypto_register_alg(base);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_skcipher);
|
|
|
|
void crypto_unregister_skcipher(struct skcipher_alg *alg)
|
|
{
|
|
crypto_unregister_alg(&alg->base);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_skcipher);
|
|
|
|
int crypto_register_skciphers(struct skcipher_alg *algs, int count)
|
|
{
|
|
int i, ret;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
ret = crypto_register_skcipher(&algs[i]);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
for (--i; i >= 0; --i)
|
|
crypto_unregister_skcipher(&algs[i]);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_skciphers);
|
|
|
|
void crypto_unregister_skciphers(struct skcipher_alg *algs, int count)
|
|
{
|
|
int i;
|
|
|
|
for (i = count - 1; i >= 0; --i)
|
|
crypto_unregister_skcipher(&algs[i]);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_skciphers);
|
|
|
|
int skcipher_register_instance(struct crypto_template *tmpl,
|
|
struct skcipher_instance *inst)
|
|
{
|
|
int err;
|
|
|
|
if (WARN_ON(!inst->free))
|
|
return -EINVAL;
|
|
|
|
err = skcipher_prepare_alg(&inst->alg);
|
|
if (err)
|
|
return err;
|
|
|
|
return crypto_register_instance(tmpl, skcipher_crypto_instance(inst));
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_register_instance);
|
|
|
|
static int skcipher_setkey_simple(struct crypto_skcipher *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
|
|
|
|
crypto_cipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK);
|
|
crypto_cipher_set_flags(cipher, crypto_skcipher_get_flags(tfm) &
|
|
CRYPTO_TFM_REQ_MASK);
|
|
return crypto_cipher_setkey(cipher, key, keylen);
|
|
}
|
|
|
|
static int skcipher_init_tfm_simple(struct crypto_skcipher *tfm)
|
|
{
|
|
struct skcipher_instance *inst = skcipher_alg_instance(tfm);
|
|
struct crypto_cipher_spawn *spawn = skcipher_instance_ctx(inst);
|
|
struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm);
|
|
struct crypto_cipher *cipher;
|
|
|
|
cipher = crypto_spawn_cipher(spawn);
|
|
if (IS_ERR(cipher))
|
|
return PTR_ERR(cipher);
|
|
|
|
ctx->cipher = cipher;
|
|
return 0;
|
|
}
|
|
|
|
static void skcipher_exit_tfm_simple(struct crypto_skcipher *tfm)
|
|
{
|
|
struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm);
|
|
|
|
crypto_free_cipher(ctx->cipher);
|
|
}
|
|
|
|
static void skcipher_free_instance_simple(struct skcipher_instance *inst)
|
|
{
|
|
crypto_drop_cipher(skcipher_instance_ctx(inst));
|
|
kfree(inst);
|
|
}
|
|
|
|
/**
|
|
* skcipher_alloc_instance_simple - allocate instance of simple block cipher mode
|
|
*
|
|
* Allocate an skcipher_instance for a simple block cipher mode of operation,
|
|
* e.g. cbc or ecb. The instance context will have just a single crypto_spawn,
|
|
* that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize,
|
|
* alignmask, and priority are set from the underlying cipher but can be
|
|
* overridden if needed. The tfm context defaults to skcipher_ctx_simple, and
|
|
* default ->setkey(), ->init(), and ->exit() methods are installed.
|
|
*
|
|
* @tmpl: the template being instantiated
|
|
* @tb: the template parameters
|
|
*
|
|
* Return: a pointer to the new instance, or an ERR_PTR(). The caller still
|
|
* needs to register the instance.
|
|
*/
|
|
struct skcipher_instance *skcipher_alloc_instance_simple(
|
|
struct crypto_template *tmpl, struct rtattr **tb)
|
|
{
|
|
u32 mask;
|
|
struct skcipher_instance *inst;
|
|
struct crypto_cipher_spawn *spawn;
|
|
struct crypto_alg *cipher_alg;
|
|
int err;
|
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
if (!inst)
|
|
return ERR_PTR(-ENOMEM);
|
|
spawn = skcipher_instance_ctx(inst);
|
|
|
|
err = crypto_grab_cipher(spawn, skcipher_crypto_instance(inst),
|
|
crypto_attr_alg_name(tb[1]), 0, mask);
|
|
if (err)
|
|
goto err_free_inst;
|
|
cipher_alg = crypto_spawn_cipher_alg(spawn);
|
|
|
|
err = crypto_inst_setname(skcipher_crypto_instance(inst), tmpl->name,
|
|
cipher_alg);
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
inst->free = skcipher_free_instance_simple;
|
|
|
|
/* Default algorithm properties, can be overridden */
|
|
inst->alg.base.cra_blocksize = cipher_alg->cra_blocksize;
|
|
inst->alg.base.cra_alignmask = cipher_alg->cra_alignmask;
|
|
inst->alg.base.cra_priority = cipher_alg->cra_priority;
|
|
inst->alg.min_keysize = cipher_alg->cra_cipher.cia_min_keysize;
|
|
inst->alg.max_keysize = cipher_alg->cra_cipher.cia_max_keysize;
|
|
inst->alg.ivsize = cipher_alg->cra_blocksize;
|
|
|
|
/* Use skcipher_ctx_simple by default, can be overridden */
|
|
inst->alg.base.cra_ctxsize = sizeof(struct skcipher_ctx_simple);
|
|
inst->alg.setkey = skcipher_setkey_simple;
|
|
inst->alg.init = skcipher_init_tfm_simple;
|
|
inst->alg.exit = skcipher_exit_tfm_simple;
|
|
|
|
return inst;
|
|
|
|
err_free_inst:
|
|
skcipher_free_instance_simple(inst);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_alloc_instance_simple);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Symmetric key cipher type");
|
|
MODULE_IMPORT_NS(CRYPTO_INTERNAL);
|