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![Herbert Xu](/assets/img/avatar_default.png)
When an skcipher constructed through crypto_givcipher_default fails its selftest, we'll loop forever trying to construct new skcipher objects but failing because it already exists. The crux of the issue is that once a givcipher fails the selftest, we'll ignore it on the next run through crypto_skcipher_lookup and attempt to construct a new givcipher. We should instead return an error to the caller if we find a givcipher that has failed the test. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
700 lines
19 KiB
C
700 lines
19 KiB
C
/*
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* Block chaining 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) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <linux/errno.h>
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#include <linux/hardirq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <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 "internal.h"
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enum {
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BLKCIPHER_WALK_PHYS = 1 << 0,
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BLKCIPHER_WALK_SLOW = 1 << 1,
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BLKCIPHER_WALK_COPY = 1 << 2,
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BLKCIPHER_WALK_DIFF = 1 << 3,
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};
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static int blkcipher_walk_next(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk);
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static int blkcipher_walk_first(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk);
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static inline void blkcipher_map_src(struct blkcipher_walk *walk)
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{
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walk->src.virt.addr = scatterwalk_map(&walk->in, 0);
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}
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static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
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{
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walk->dst.virt.addr = scatterwalk_map(&walk->out, 1);
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}
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static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
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{
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scatterwalk_unmap(walk->src.virt.addr, 0);
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}
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static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
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{
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scatterwalk_unmap(walk->dst.virt.addr, 1);
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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 *blkcipher_get_spot(u8 *start, unsigned int len)
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{
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u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
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return max(start, end_page);
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}
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static inline unsigned int blkcipher_done_slow(struct crypto_blkcipher *tfm,
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struct blkcipher_walk *walk,
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unsigned int bsize)
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{
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u8 *addr;
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unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
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addr = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1);
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addr = blkcipher_get_spot(addr, bsize);
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scatterwalk_copychunks(addr, &walk->out, bsize, 1);
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return bsize;
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}
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static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
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unsigned int n)
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{
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if (walk->flags & BLKCIPHER_WALK_COPY) {
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blkcipher_map_dst(walk);
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memcpy(walk->dst.virt.addr, walk->page, n);
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blkcipher_unmap_dst(walk);
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} else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) {
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blkcipher_unmap_src(walk);
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if (walk->flags & BLKCIPHER_WALK_DIFF)
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blkcipher_unmap_dst(walk);
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}
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scatterwalk_advance(&walk->in, n);
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scatterwalk_advance(&walk->out, n);
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return n;
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}
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int blkcipher_walk_done(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk, int err)
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{
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struct crypto_blkcipher *tfm = desc->tfm;
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unsigned int nbytes = 0;
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if (likely(err >= 0)) {
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unsigned int n = walk->nbytes - err;
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if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
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n = blkcipher_done_fast(walk, n);
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else if (WARN_ON(err)) {
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err = -EINVAL;
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goto err;
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} else
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n = blkcipher_done_slow(tfm, walk, n);
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nbytes = walk->total - n;
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err = 0;
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}
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scatterwalk_done(&walk->in, 0, nbytes);
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scatterwalk_done(&walk->out, 1, nbytes);
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err:
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walk->total = nbytes;
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walk->nbytes = nbytes;
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if (nbytes) {
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crypto_yield(desc->flags);
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return blkcipher_walk_next(desc, walk);
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}
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if (walk->iv != desc->info)
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memcpy(desc->info, walk->iv, crypto_blkcipher_ivsize(tfm));
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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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return err;
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}
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EXPORT_SYMBOL_GPL(blkcipher_walk_done);
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static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk,
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unsigned int bsize,
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unsigned int alignmask)
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{
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unsigned int n;
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unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
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if (walk->buffer)
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goto ok;
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walk->buffer = walk->page;
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if (walk->buffer)
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goto ok;
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n = aligned_bsize * 3 - (alignmask + 1) +
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(alignmask & ~(crypto_tfm_ctx_alignment() - 1));
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walk->buffer = kmalloc(n, GFP_ATOMIC);
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if (!walk->buffer)
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return blkcipher_walk_done(desc, walk, -ENOMEM);
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ok:
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walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
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alignmask + 1);
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walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
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walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
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aligned_bsize, bsize);
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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 |= BLKCIPHER_WALK_SLOW;
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return 0;
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}
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static inline int blkcipher_next_copy(struct blkcipher_walk *walk)
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{
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u8 *tmp = walk->page;
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blkcipher_map_src(walk);
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memcpy(tmp, walk->src.virt.addr, walk->nbytes);
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blkcipher_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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return 0;
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}
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static inline int blkcipher_next_fast(struct blkcipher_desc *desc,
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struct blkcipher_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 & BLKCIPHER_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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blkcipher_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 |= BLKCIPHER_WALK_DIFF;
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blkcipher_map_dst(walk);
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}
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return 0;
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}
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static int blkcipher_walk_next(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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struct crypto_blkcipher *tfm = desc->tfm;
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unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
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unsigned int bsize;
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unsigned int n;
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int err;
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n = walk->total;
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if (unlikely(n < crypto_blkcipher_blocksize(tfm))) {
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desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
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return blkcipher_walk_done(desc, walk, -EINVAL);
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}
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walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
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BLKCIPHER_WALK_DIFF);
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if (!scatterwalk_aligned(&walk->in, alignmask) ||
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!scatterwalk_aligned(&walk->out, alignmask)) {
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walk->flags |= BLKCIPHER_WALK_COPY;
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if (!walk->page) {
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walk->page = (void *)__get_free_page(GFP_ATOMIC);
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if (!walk->page)
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n = 0;
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}
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}
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bsize = min(walk->blocksize, n);
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n = scatterwalk_clamp(&walk->in, n);
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n = scatterwalk_clamp(&walk->out, n);
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if (unlikely(n < bsize)) {
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err = blkcipher_next_slow(desc, walk, bsize, alignmask);
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goto set_phys_lowmem;
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}
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walk->nbytes = n;
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if (walk->flags & BLKCIPHER_WALK_COPY) {
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err = blkcipher_next_copy(walk);
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goto set_phys_lowmem;
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}
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return blkcipher_next_fast(desc, walk);
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set_phys_lowmem:
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if (walk->flags & BLKCIPHER_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 inline int blkcipher_copy_iv(struct blkcipher_walk *walk,
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struct crypto_blkcipher *tfm,
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unsigned int alignmask)
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{
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unsigned bs = walk->blocksize;
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unsigned int ivsize = crypto_blkcipher_ivsize(tfm);
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unsigned aligned_bs = ALIGN(bs, alignmask + 1);
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unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
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(alignmask + 1);
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u8 *iv;
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size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
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walk->buffer = kmalloc(size, GFP_ATOMIC);
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if (!walk->buffer)
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return -ENOMEM;
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iv = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1);
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iv = blkcipher_get_spot(iv, bs) + aligned_bs;
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iv = blkcipher_get_spot(iv, bs) + aligned_bs;
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iv = blkcipher_get_spot(iv, ivsize);
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walk->iv = memcpy(iv, walk->iv, ivsize);
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return 0;
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}
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int blkcipher_walk_virt(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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walk->flags &= ~BLKCIPHER_WALK_PHYS;
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walk->blocksize = crypto_blkcipher_blocksize(desc->tfm);
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return blkcipher_walk_first(desc, walk);
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}
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EXPORT_SYMBOL_GPL(blkcipher_walk_virt);
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int blkcipher_walk_phys(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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walk->flags |= BLKCIPHER_WALK_PHYS;
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walk->blocksize = crypto_blkcipher_blocksize(desc->tfm);
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return blkcipher_walk_first(desc, walk);
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}
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EXPORT_SYMBOL_GPL(blkcipher_walk_phys);
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static int blkcipher_walk_first(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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struct crypto_blkcipher *tfm = desc->tfm;
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unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
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if (WARN_ON_ONCE(in_irq()))
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return -EDEADLK;
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walk->nbytes = walk->total;
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if (unlikely(!walk->total))
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return 0;
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walk->buffer = NULL;
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walk->iv = desc->info;
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if (unlikely(((unsigned long)walk->iv & alignmask))) {
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int err = blkcipher_copy_iv(walk, tfm, alignmask);
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if (err)
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return err;
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}
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scatterwalk_start(&walk->in, walk->in.sg);
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scatterwalk_start(&walk->out, walk->out.sg);
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walk->page = NULL;
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return blkcipher_walk_next(desc, walk);
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}
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int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk,
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unsigned int blocksize)
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{
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walk->flags &= ~BLKCIPHER_WALK_PHYS;
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walk->blocksize = blocksize;
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return blkcipher_walk_first(desc, walk);
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}
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EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block);
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static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
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unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
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int ret;
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u8 *buffer, *alignbuffer;
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unsigned long absize;
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absize = keylen + alignmask;
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buffer = kmalloc(absize, GFP_ATOMIC);
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if (!buffer)
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return -ENOMEM;
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alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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memcpy(alignbuffer, key, keylen);
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ret = cipher->setkey(tfm, alignbuffer, keylen);
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memset(alignbuffer, 0, keylen);
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kfree(buffer);
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return ret;
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}
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static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
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{
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struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
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unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
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if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
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tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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if ((unsigned long)key & alignmask)
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return setkey_unaligned(tfm, key, keylen);
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return cipher->setkey(tfm, key, keylen);
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}
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static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
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unsigned int keylen)
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{
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return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
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}
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static int async_encrypt(struct ablkcipher_request *req)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
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struct blkcipher_desc desc = {
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.tfm = __crypto_blkcipher_cast(tfm),
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.info = req->info,
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.flags = req->base.flags,
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};
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return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
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}
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static int async_decrypt(struct ablkcipher_request *req)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
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struct blkcipher_desc desc = {
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.tfm = __crypto_blkcipher_cast(tfm),
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.info = req->info,
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.flags = req->base.flags,
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};
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return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
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}
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static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
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u32 mask)
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{
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struct blkcipher_alg *cipher = &alg->cra_blkcipher;
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unsigned int len = alg->cra_ctxsize;
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if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK &&
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cipher->ivsize) {
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len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
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len += cipher->ivsize;
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}
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return len;
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}
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static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
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{
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struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
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struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
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crt->setkey = async_setkey;
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crt->encrypt = async_encrypt;
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crt->decrypt = async_decrypt;
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if (!alg->ivsize) {
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crt->givencrypt = skcipher_null_givencrypt;
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crt->givdecrypt = skcipher_null_givdecrypt;
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}
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crt->base = __crypto_ablkcipher_cast(tfm);
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crt->ivsize = alg->ivsize;
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return 0;
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}
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static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
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{
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struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
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struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
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unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
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unsigned long addr;
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crt->setkey = setkey;
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crt->encrypt = alg->encrypt;
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crt->decrypt = alg->decrypt;
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addr = (unsigned long)crypto_tfm_ctx(tfm);
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addr = ALIGN(addr, align);
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addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
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crt->iv = (void *)addr;
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return 0;
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}
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static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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{
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struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
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if (alg->ivsize > PAGE_SIZE / 8)
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return -EINVAL;
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if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
|
|
return crypto_init_blkcipher_ops_sync(tfm);
|
|
else
|
|
return crypto_init_blkcipher_ops_async(tfm);
|
|
}
|
|
|
|
static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
|
|
__attribute__ ((unused));
|
|
static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
|
|
{
|
|
seq_printf(m, "type : blkcipher\n");
|
|
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
|
|
seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize);
|
|
seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize);
|
|
seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize);
|
|
seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?:
|
|
"<default>");
|
|
}
|
|
|
|
const struct crypto_type crypto_blkcipher_type = {
|
|
.ctxsize = crypto_blkcipher_ctxsize,
|
|
.init = crypto_init_blkcipher_ops,
|
|
#ifdef CONFIG_PROC_FS
|
|
.show = crypto_blkcipher_show,
|
|
#endif
|
|
};
|
|
EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
|
|
|
|
static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn,
|
|
const char *name, u32 type, u32 mask)
|
|
{
|
|
struct crypto_alg *alg;
|
|
int err;
|
|
|
|
type = crypto_skcipher_type(type);
|
|
mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV;
|
|
|
|
alg = crypto_alg_mod_lookup(name, type, mask);
|
|
if (IS_ERR(alg))
|
|
return PTR_ERR(alg);
|
|
|
|
err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
|
|
crypto_mod_put(alg);
|
|
return err;
|
|
}
|
|
|
|
struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl,
|
|
struct rtattr **tb, u32 type,
|
|
u32 mask)
|
|
{
|
|
struct {
|
|
int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
|
|
unsigned int keylen);
|
|
int (*encrypt)(struct ablkcipher_request *req);
|
|
int (*decrypt)(struct ablkcipher_request *req);
|
|
|
|
unsigned int min_keysize;
|
|
unsigned int max_keysize;
|
|
unsigned int ivsize;
|
|
|
|
const char *geniv;
|
|
} balg;
|
|
const char *name;
|
|
struct crypto_skcipher_spawn *spawn;
|
|
struct crypto_attr_type *algt;
|
|
struct crypto_instance *inst;
|
|
struct crypto_alg *alg;
|
|
int err;
|
|
|
|
algt = crypto_get_attr_type(tb);
|
|
err = PTR_ERR(algt);
|
|
if (IS_ERR(algt))
|
|
return ERR_PTR(err);
|
|
|
|
if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) &
|
|
algt->mask)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
name = crypto_attr_alg_name(tb[1]);
|
|
err = PTR_ERR(name);
|
|
if (IS_ERR(name))
|
|
return ERR_PTR(err);
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
if (!inst)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
spawn = crypto_instance_ctx(inst);
|
|
|
|
/* Ignore async algorithms if necessary. */
|
|
mask |= crypto_requires_sync(algt->type, algt->mask);
|
|
|
|
crypto_set_skcipher_spawn(spawn, inst);
|
|
err = crypto_grab_nivcipher(spawn, name, type, mask);
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
alg = crypto_skcipher_spawn_alg(spawn);
|
|
|
|
if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
|
|
CRYPTO_ALG_TYPE_BLKCIPHER) {
|
|
balg.ivsize = alg->cra_blkcipher.ivsize;
|
|
balg.min_keysize = alg->cra_blkcipher.min_keysize;
|
|
balg.max_keysize = alg->cra_blkcipher.max_keysize;
|
|
|
|
balg.setkey = async_setkey;
|
|
balg.encrypt = async_encrypt;
|
|
balg.decrypt = async_decrypt;
|
|
|
|
balg.geniv = alg->cra_blkcipher.geniv;
|
|
} else {
|
|
balg.ivsize = alg->cra_ablkcipher.ivsize;
|
|
balg.min_keysize = alg->cra_ablkcipher.min_keysize;
|
|
balg.max_keysize = alg->cra_ablkcipher.max_keysize;
|
|
|
|
balg.setkey = alg->cra_ablkcipher.setkey;
|
|
balg.encrypt = alg->cra_ablkcipher.encrypt;
|
|
balg.decrypt = alg->cra_ablkcipher.decrypt;
|
|
|
|
balg.geniv = alg->cra_ablkcipher.geniv;
|
|
}
|
|
|
|
err = -EINVAL;
|
|
if (!balg.ivsize)
|
|
goto err_drop_alg;
|
|
|
|
/*
|
|
* This is only true if we're constructing an algorithm with its
|
|
* default IV generator. For the default generator we elide the
|
|
* template name and double-check the IV generator.
|
|
*/
|
|
if (algt->mask & CRYPTO_ALG_GENIV) {
|
|
if (!balg.geniv)
|
|
balg.geniv = crypto_default_geniv(alg);
|
|
err = -EAGAIN;
|
|
if (strcmp(tmpl->name, balg.geniv))
|
|
goto err_drop_alg;
|
|
|
|
memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
|
|
memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
|
|
CRYPTO_MAX_ALG_NAME);
|
|
} else {
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"%s(%s)", tmpl->name, alg->cra_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto err_drop_alg;
|
|
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
|
"%s(%s)", tmpl->name, alg->cra_driver_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto err_drop_alg;
|
|
}
|
|
|
|
inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV;
|
|
inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
|
|
inst->alg.cra_priority = alg->cra_priority;
|
|
inst->alg.cra_blocksize = alg->cra_blocksize;
|
|
inst->alg.cra_alignmask = alg->cra_alignmask;
|
|
inst->alg.cra_type = &crypto_givcipher_type;
|
|
|
|
inst->alg.cra_ablkcipher.ivsize = balg.ivsize;
|
|
inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize;
|
|
inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize;
|
|
inst->alg.cra_ablkcipher.geniv = balg.geniv;
|
|
|
|
inst->alg.cra_ablkcipher.setkey = balg.setkey;
|
|
inst->alg.cra_ablkcipher.encrypt = balg.encrypt;
|
|
inst->alg.cra_ablkcipher.decrypt = balg.decrypt;
|
|
|
|
out:
|
|
return inst;
|
|
|
|
err_drop_alg:
|
|
crypto_drop_skcipher(spawn);
|
|
err_free_inst:
|
|
kfree(inst);
|
|
inst = ERR_PTR(err);
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_geniv_alloc);
|
|
|
|
void skcipher_geniv_free(struct crypto_instance *inst)
|
|
{
|
|
crypto_drop_skcipher(crypto_instance_ctx(inst));
|
|
kfree(inst);
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_geniv_free);
|
|
|
|
int skcipher_geniv_init(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_instance *inst = (void *)tfm->__crt_alg;
|
|
struct crypto_ablkcipher *cipher;
|
|
|
|
cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst));
|
|
if (IS_ERR(cipher))
|
|
return PTR_ERR(cipher);
|
|
|
|
tfm->crt_ablkcipher.base = cipher;
|
|
tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_geniv_init);
|
|
|
|
void skcipher_geniv_exit(struct crypto_tfm *tfm)
|
|
{
|
|
crypto_free_ablkcipher(tfm->crt_ablkcipher.base);
|
|
}
|
|
EXPORT_SYMBOL_GPL(skcipher_geniv_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Generic block chaining cipher type");
|