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![Waiman Long](/assets/img/avatar_default.png)
As said by Linus: A symmetric naming is only helpful if it implies symmetries in use. Otherwise it's actively misleading. In "kzalloc()", the z is meaningful and an important part of what the caller wants. In "kzfree()", the z is actively detrimental, because maybe in the future we really _might_ want to use that "memfill(0xdeadbeef)" or something. The "zero" part of the interface isn't even _relevant_. The main reason that kzfree() exists is to clear sensitive information that should not be leaked to other future users of the same memory objects. Rename kzfree() to kfree_sensitive() to follow the example of the recently added kvfree_sensitive() and make the intention of the API more explicit. In addition, memzero_explicit() is used to clear the memory to make sure that it won't get optimized away by the compiler. The renaming is done by using the command sequence: git grep -w --name-only kzfree |\ xargs sed -i 's/kzfree/kfree_sensitive/' followed by some editing of the kfree_sensitive() kerneldoc and adding a kzfree backward compatibility macro in slab.h. [akpm@linux-foundation.org: fs/crypto/inline_crypt.c needs linux/slab.h] [akpm@linux-foundation.org: fix fs/crypto/inline_crypt.c some more] Suggested-by: Joe Perches <joe@perches.com> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Cc: James Morris <jmorris@namei.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: Joe Perches <joe@perches.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: David Rientjes <rientjes@google.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: "Jason A . Donenfeld" <Jason@zx2c4.com> Link: http://lkml.kernel.org/r/20200616154311.12314-3-longman@redhat.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
988 lines
25 KiB
C
988 lines
25 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/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/compiler.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/rtnetlink.h>
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#include <linux/seq_file.h>
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#include <net/netlink.h>
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#include "internal.h"
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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 int skcipher_walk_next(struct skcipher_walk *walk);
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static inline void skcipher_unmap(struct scatter_walk *walk, void *vaddr)
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{
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if (PageHighMem(scatterwalk_page(walk)))
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kunmap_atomic(vaddr);
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}
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static inline void *skcipher_map(struct scatter_walk *walk)
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{
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struct page *page = scatterwalk_page(walk);
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return (PageHighMem(page) ? kmap_atomic(page) : page_address(page)) +
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offset_in_page(walk->offset);
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}
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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 = skcipher_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 = skcipher_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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skcipher_unmap(&walk->in, 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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skcipher_unmap(&walk->out, 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 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_irq()))
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return -EDEADLK;
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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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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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walk->total = req->cryptlen;
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walk->nbytes = 0;
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walk->iv = req->iv;
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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);
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walk->flags &= ~SKCIPHER_WALK_SLEEP;
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walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
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SKCIPHER_WALK_SLEEP : 0;
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walk->blocksize = crypto_skcipher_blocksize(tfm);
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walk->stride = crypto_skcipher_walksize(tfm);
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walk->ivsize = crypto_skcipher_ivsize(tfm);
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walk->alignmask = crypto_skcipher_alignmask(tfm);
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return skcipher_walk_first(walk);
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}
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int skcipher_walk_virt(struct skcipher_walk *walk,
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struct skcipher_request *req, bool atomic)
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{
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int err;
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might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
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walk->flags &= ~SKCIPHER_WALK_PHYS;
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err = skcipher_walk_skcipher(walk, req);
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|
|
walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0;
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_walk_virt);
|
|
|
|
void skcipher_walk_atomise(struct skcipher_walk *walk)
|
|
{
|
|
walk->flags &= ~SKCIPHER_WALK_SLEEP;
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_walk_atomise);
|
|
|
|
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 (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);
|
|
|
|
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 crypto_alg *alg = tfm->base.__crt_alg;
|
|
unsigned int cryptlen = req->cryptlen;
|
|
int ret;
|
|
|
|
crypto_stats_get(alg);
|
|
if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
|
|
ret = -ENOKEY;
|
|
else
|
|
ret = crypto_skcipher_alg(tfm)->encrypt(req);
|
|
crypto_stats_skcipher_encrypt(cryptlen, ret, alg);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_skcipher_encrypt);
|
|
|
|
int crypto_skcipher_decrypt(struct skcipher_request *req)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
|
struct crypto_alg *alg = tfm->base.__crt_alg;
|
|
unsigned int cryptlen = req->cryptlen;
|
|
int ret;
|
|
|
|
crypto_stats_get(alg);
|
|
if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
|
|
ret = -ENOKEY;
|
|
else
|
|
ret = crypto_skcipher_alg(tfm)->decrypt(req);
|
|
crypto_stats_skcipher_decrypt(cryptlen, ret, alg);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_skcipher_decrypt);
|
|
|
|
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 (alg->exit)
|
|
skcipher->base.exit = crypto_skcipher_exit_tfm;
|
|
|
|
if (alg->init)
|
|
return alg->init(skcipher);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 = container_of(alg, struct skcipher_alg,
|
|
base);
|
|
|
|
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);
|
|
}
|
|
|
|
#ifdef CONFIG_NET
|
|
static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
|
|
{
|
|
struct crypto_report_blkcipher rblkcipher;
|
|
struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg,
|
|
base);
|
|
|
|
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);
|
|
}
|
|
#else
|
|
static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
static const struct crypto_type crypto_skcipher_type = {
|
|
.extsize = crypto_alg_extsize,
|
|
.init_tfm = crypto_skcipher_init_tfm,
|
|
.free = crypto_skcipher_free_instance,
|
|
#ifdef CONFIG_PROC_FS
|
|
.show = crypto_skcipher_show,
|
|
#endif
|
|
.report = crypto_skcipher_report,
|
|
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
|
|
.maskset = CRYPTO_ALG_TYPE_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;
|
|
|
|
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);
|
|
|
|
static int skcipher_prepare_alg(struct skcipher_alg *alg)
|
|
{
|
|
struct crypto_alg *base = &alg->base;
|
|
|
|
if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 ||
|
|
alg->walksize > PAGE_SIZE / 8)
|
|
return -EINVAL;
|
|
|
|
if (!alg->chunksize)
|
|
alg->chunksize = base->cra_blocksize;
|
|
if (!alg->walksize)
|
|
alg->walksize = alg->chunksize;
|
|
|
|
base->cra_type = &crypto_skcipher_type;
|
|
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
|
|
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");
|