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988 lines
25 KiB
988 lines
25 KiB
// 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 <[email protected]> |
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*/ |
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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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|
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static int skcipher_walk_next(struct skcipher_walk *walk); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0; |
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return err; |
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} |
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EXPORT_SYMBOL_GPL(skcipher_walk_virt); |
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void skcipher_walk_atomise(struct skcipher_walk *walk) |
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{ |
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walk->flags &= ~SKCIPHER_WALK_SLEEP; |
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} |
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EXPORT_SYMBOL_GPL(skcipher_walk_atomise); |
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int skcipher_walk_async(struct skcipher_walk *walk, |
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struct skcipher_request *req) |
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{ |
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walk->flags |= SKCIPHER_WALK_PHYS; |
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|
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INIT_LIST_HEAD(&walk->buffers); |
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|
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return skcipher_walk_skcipher(walk, req); |
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} |
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EXPORT_SYMBOL_GPL(skcipher_walk_async); |
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|
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static int skcipher_walk_aead_common(struct skcipher_walk *walk, |
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struct aead_request *req, bool atomic) |
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{ |
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struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
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int err; |
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|
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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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|
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if (unlikely(!walk->total)) |
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return 0; |
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|
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walk->flags &= ~SKCIPHER_WALK_PHYS; |
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|
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scatterwalk_start(&walk->in, req->src); |
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scatterwalk_start(&walk->out, req->dst); |
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|
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scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2); |
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scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2); |
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|
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scatterwalk_done(&walk->in, 0, walk->total); |
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scatterwalk_done(&walk->out, 0, walk->total); |
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|
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if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) |
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walk->flags |= SKCIPHER_WALK_SLEEP; |
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else |
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walk->flags &= ~SKCIPHER_WALK_SLEEP; |
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|
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walk->blocksize = crypto_aead_blocksize(tfm); |
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walk->stride = crypto_aead_chunksize(tfm); |
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walk->ivsize = crypto_aead_ivsize(tfm); |
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walk->alignmask = crypto_aead_alignmask(tfm); |
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|
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err = skcipher_walk_first(walk); |
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|
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if (atomic) |
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walk->flags &= ~SKCIPHER_WALK_SLEEP; |
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|
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return err; |
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} |
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|
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int skcipher_walk_aead_encrypt(struct skcipher_walk *walk, |
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struct aead_request *req, bool atomic) |
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{ |
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walk->total = req->cryptlen; |
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|
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return skcipher_walk_aead_common(walk, req, atomic); |
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} |
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EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt); |
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|
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int skcipher_walk_aead_decrypt(struct skcipher_walk *walk, |
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struct aead_request *req, bool atomic) |
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{ |
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struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
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|
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walk->total = req->cryptlen - crypto_aead_authsize(tfm); |
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|
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return skcipher_walk_aead_common(walk, req, atomic); |
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} |
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EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt); |
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|
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static void skcipher_set_needkey(struct crypto_skcipher *tfm) |
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{ |
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if (crypto_skcipher_max_keysize(tfm) != 0) |
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crypto_skcipher_set_flags(tfm, CRYPTO_TFM_NEED_KEY); |
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} |
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|
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static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm, |
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const u8 *key, unsigned int keylen) |
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{ |
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unsigned long alignmask = crypto_skcipher_alignmask(tfm); |
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struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); |
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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");
|
|
|