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crypto/skcipher.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Symmetric key cipher operations. * * Generic encrypt/decrypt wrapper for ciphers, handles operations across * multiple page boundaries by using temporary blocks. In user context, * the kernel is given a chance to schedule us once per page. * * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au> |
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*/ |
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#include <crypto/internal/aead.h> |
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#include <crypto/internal/skcipher.h> |
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#include <crypto/scatterwalk.h> |
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#include <linux/bug.h> |
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#include <linux/cryptouser.h> |
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#include <linux/compiler.h> |
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#include <linux/list.h> |
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#include <linux/module.h> |
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#include <linux/rtnetlink.h> #include <linux/seq_file.h> #include <net/netlink.h> |
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#include "internal.h" |
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enum { SKCIPHER_WALK_PHYS = 1 << 0, SKCIPHER_WALK_SLOW = 1 << 1, SKCIPHER_WALK_COPY = 1 << 2, SKCIPHER_WALK_DIFF = 1 << 3, SKCIPHER_WALK_SLEEP = 1 << 4, }; struct skcipher_walk_buffer { struct list_head entry; struct scatter_walk dst; unsigned int len; u8 *data; u8 buffer[]; }; static int skcipher_walk_next(struct skcipher_walk *walk); static inline void skcipher_unmap(struct scatter_walk *walk, void *vaddr) { if (PageHighMem(scatterwalk_page(walk))) kunmap_atomic(vaddr); } static inline void *skcipher_map(struct scatter_walk *walk) { struct page *page = scatterwalk_page(walk); return (PageHighMem(page) ? kmap_atomic(page) : page_address(page)) + offset_in_page(walk->offset); } static inline void skcipher_map_src(struct skcipher_walk *walk) { walk->src.virt.addr = skcipher_map(&walk->in); } static inline void skcipher_map_dst(struct skcipher_walk *walk) { walk->dst.virt.addr = skcipher_map(&walk->out); } static inline void skcipher_unmap_src(struct skcipher_walk *walk) { skcipher_unmap(&walk->in, walk->src.virt.addr); } static inline void skcipher_unmap_dst(struct skcipher_walk *walk) { skcipher_unmap(&walk->out, walk->dst.virt.addr); } static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk) { return walk->flags & SKCIPHER_WALK_SLEEP ? GFP_KERNEL : GFP_ATOMIC; } /* Get a spot of the specified length that does not straddle a page. * The caller needs to ensure that there is enough space for this operation. */ static inline u8 *skcipher_get_spot(u8 *start, unsigned int len) { u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); return max(start, end_page); } |
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static int skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize) |
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{ u8 *addr; addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); addr = skcipher_get_spot(addr, bsize); scatterwalk_copychunks(addr, &walk->out, bsize, (walk->flags & SKCIPHER_WALK_PHYS) ? 2 : 1); |
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return 0; |
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} int skcipher_walk_done(struct skcipher_walk *walk, int err) { |
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unsigned int n = walk->nbytes; unsigned int nbytes = 0; |
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if (!n) |
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goto finish; |
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if (likely(err >= 0)) { n -= err; nbytes = walk->total - n; } |
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if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS | SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY | SKCIPHER_WALK_DIFF)))) { |
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unmap_src: skcipher_unmap_src(walk); } else if (walk->flags & SKCIPHER_WALK_DIFF) { skcipher_unmap_dst(walk); goto unmap_src; } else if (walk->flags & SKCIPHER_WALK_COPY) { skcipher_map_dst(walk); memcpy(walk->dst.virt.addr, walk->page, n); skcipher_unmap_dst(walk); } else if (unlikely(walk->flags & SKCIPHER_WALK_SLOW)) { |
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if (err > 0) { |
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/* * Didn't process all bytes. Either the algorithm is * broken, or this was the last step and it turned out * the message wasn't evenly divisible into blocks but * the algorithm requires it. */ |
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err = -EINVAL; |
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nbytes = 0; } else n = skcipher_done_slow(walk, n); |
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} |
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if (err > 0) err = 0; walk->total = nbytes; walk->nbytes = 0; |
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scatterwalk_advance(&walk->in, n); scatterwalk_advance(&walk->out, n); |
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scatterwalk_done(&walk->in, 0, nbytes); scatterwalk_done(&walk->out, 1, nbytes); |
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if (nbytes) { |
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crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ? CRYPTO_TFM_REQ_MAY_SLEEP : 0); return skcipher_walk_next(walk); } |
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finish: |
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/* Short-circuit for the common/fast path. */ if (!((unsigned long)walk->buffer | (unsigned long)walk->page)) goto out; if (walk->flags & SKCIPHER_WALK_PHYS) goto out; if (walk->iv != walk->oiv) memcpy(walk->oiv, walk->iv, walk->ivsize); if (walk->buffer != walk->page) kfree(walk->buffer); if (walk->page) free_page((unsigned long)walk->page); out: return err; } EXPORT_SYMBOL_GPL(skcipher_walk_done); void skcipher_walk_complete(struct skcipher_walk *walk, int err) { struct skcipher_walk_buffer *p, *tmp; list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { u8 *data; if (err) goto done; data = p->data; if (!data) { data = PTR_ALIGN(&p->buffer[0], walk->alignmask + 1); |
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data = skcipher_get_spot(data, walk->stride); |
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} scatterwalk_copychunks(data, &p->dst, p->len, 1); |
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if (offset_in_page(p->data) + p->len + walk->stride > |
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PAGE_SIZE) free_page((unsigned long)p->data); done: list_del(&p->entry); kfree(p); } if (!err && walk->iv != walk->oiv) memcpy(walk->oiv, walk->iv, walk->ivsize); if (walk->buffer != walk->page) kfree(walk->buffer); if (walk->page) free_page((unsigned long)walk->page); } EXPORT_SYMBOL_GPL(skcipher_walk_complete); static void skcipher_queue_write(struct skcipher_walk *walk, struct skcipher_walk_buffer *p) { p->dst = walk->out; list_add_tail(&p->entry, &walk->buffers); } static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize) { bool phys = walk->flags & SKCIPHER_WALK_PHYS; unsigned alignmask = walk->alignmask; struct skcipher_walk_buffer *p; unsigned a; unsigned n; u8 *buffer; void *v; if (!phys) { |
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if (!walk->buffer) walk->buffer = walk->page; buffer = walk->buffer; |
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if (buffer) goto ok; } /* Start with the minimum alignment of kmalloc. */ a = crypto_tfm_ctx_alignment() - 1; n = bsize; if (phys) { /* Calculate the minimum alignment of p->buffer. */ a &= (sizeof(*p) ^ (sizeof(*p) - 1)) >> 1; n += sizeof(*p); } /* Minimum size to align p->buffer by alignmask. */ n += alignmask & ~a; /* Minimum size to ensure p->buffer does not straddle a page. */ n += (bsize - 1) & ~(alignmask | a); v = kzalloc(n, skcipher_walk_gfp(walk)); if (!v) return skcipher_walk_done(walk, -ENOMEM); if (phys) { p = v; p->len = bsize; skcipher_queue_write(walk, p); buffer = p->buffer; } else { walk->buffer = v; buffer = v; } ok: walk->dst.virt.addr = PTR_ALIGN(buffer, alignmask + 1); walk->dst.virt.addr = skcipher_get_spot(walk->dst.virt.addr, bsize); walk->src.virt.addr = walk->dst.virt.addr; scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); walk->nbytes = bsize; walk->flags |= SKCIPHER_WALK_SLOW; return 0; } static int skcipher_next_copy(struct skcipher_walk *walk) { struct skcipher_walk_buffer *p; u8 *tmp = walk->page; skcipher_map_src(walk); memcpy(tmp, walk->src.virt.addr, walk->nbytes); skcipher_unmap_src(walk); walk->src.virt.addr = tmp; walk->dst.virt.addr = tmp; if (!(walk->flags & SKCIPHER_WALK_PHYS)) return 0; p = kmalloc(sizeof(*p), skcipher_walk_gfp(walk)); if (!p) return -ENOMEM; p->data = walk->page; p->len = walk->nbytes; 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) walk->page = NULL; else walk->page += walk->nbytes; return 0; } static int skcipher_next_fast(struct skcipher_walk *walk) { unsigned long diff; walk->src.phys.page = scatterwalk_page(&walk->in); walk->src.phys.offset = offset_in_page(walk->in.offset); walk->dst.phys.page = scatterwalk_page(&walk->out); walk->dst.phys.offset = offset_in_page(walk->out.offset); if (walk->flags & SKCIPHER_WALK_PHYS) return 0; diff = walk->src.phys.offset - walk->dst.phys.offset; diff |= walk->src.virt.page - walk->dst.virt.page; skcipher_map_src(walk); walk->dst.virt.addr = walk->src.virt.addr; if (diff) { walk->flags |= SKCIPHER_WALK_DIFF; skcipher_map_dst(walk); } return 0; } static int skcipher_walk_next(struct skcipher_walk *walk) { unsigned int bsize; unsigned int n; int err; walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY | SKCIPHER_WALK_DIFF); 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); n = scatterwalk_clamp(&walk->out, n); if (unlikely(n < bsize)) { if (unlikely(walk->total < walk->blocksize)) return skcipher_walk_done(walk, -EINVAL); slow_path: err = skcipher_next_slow(walk, bsize); goto set_phys_lowmem; } if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) { if (!walk->page) { gfp_t gfp = skcipher_walk_gfp(walk); walk->page = (void *)__get_free_page(gfp); if (!walk->page) goto slow_path; } walk->nbytes = min_t(unsigned, n, PAGE_SIZE - offset_in_page(walk->page)); walk->flags |= SKCIPHER_WALK_COPY; err = skcipher_next_copy(walk); goto set_phys_lowmem; } walk->nbytes = n; return skcipher_next_fast(walk); set_phys_lowmem: if (!err && (walk->flags & SKCIPHER_WALK_PHYS)) { walk->src.phys.page = virt_to_page(walk->src.virt.addr); walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); walk->src.phys.offset &= PAGE_SIZE - 1; walk->dst.phys.offset &= PAGE_SIZE - 1; } return err; } |
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static int skcipher_copy_iv(struct skcipher_walk *walk) { unsigned a = crypto_tfm_ctx_alignment() - 1; unsigned alignmask = walk->alignmask; unsigned ivsize = walk->ivsize; |
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unsigned bs = walk->stride; |
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unsigned aligned_bs; unsigned size; u8 *iv; |
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aligned_bs = ALIGN(bs, alignmask + 1); |
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/* Minimum size to align buffer by alignmask. */ size = alignmask & ~a; if (walk->flags & SKCIPHER_WALK_PHYS) size += ivsize; else { size += aligned_bs + ivsize; /* Minimum size to ensure buffer does not straddle a page. */ size += (bs - 1) & ~(alignmask | a); } walk->buffer = kmalloc(size, skcipher_walk_gfp(walk)); if (!walk->buffer) return -ENOMEM; iv = PTR_ALIGN(walk->buffer, alignmask + 1); iv = skcipher_get_spot(iv, bs) + aligned_bs; walk->iv = memcpy(iv, walk->iv, walk->ivsize); return 0; } static int skcipher_walk_first(struct skcipher_walk *walk) { |
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if (WARN_ON_ONCE(in_irq())) return -EDEADLK; |
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walk->buffer = NULL; if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { int err = skcipher_copy_iv(walk); if (err) return err; } walk->page = NULL; |
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return skcipher_walk_next(walk); } static int skcipher_walk_skcipher(struct skcipher_walk *walk, struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
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walk->total = req->cryptlen; walk->nbytes = 0; |
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walk->iv = req->iv; walk->oiv = req->iv; |
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if (unlikely(!walk->total)) return 0; |
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scatterwalk_start(&walk->in, req->src); scatterwalk_start(&walk->out, req->dst); |
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walk->flags &= ~SKCIPHER_WALK_SLEEP; walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? SKCIPHER_WALK_SLEEP : 0; 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); walk->alignmask = crypto_skcipher_alignmask(tfm); return skcipher_walk_first(walk); } int skcipher_walk_virt(struct skcipher_walk *walk, struct skcipher_request *req, bool atomic) { 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; err = skcipher_walk_skcipher(walk, req); walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0; return err; } EXPORT_SYMBOL_GPL(skcipher_walk_virt); void skcipher_walk_atomise(struct skcipher_walk *walk) { walk->flags &= ~SKCIPHER_WALK_SLEEP; } EXPORT_SYMBOL_GPL(skcipher_walk_atomise); int skcipher_walk_async(struct skcipher_walk *walk, struct skcipher_request *req) { walk->flags |= SKCIPHER_WALK_PHYS; INIT_LIST_HEAD(&walk->buffers); return skcipher_walk_skcipher(walk, req); } EXPORT_SYMBOL_GPL(skcipher_walk_async); |
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static int skcipher_walk_aead_common(struct skcipher_walk *walk, struct aead_request *req, bool atomic) |
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{ struct crypto_aead *tfm = crypto_aead_reqtfm(req); int err; |
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walk->nbytes = 0; |
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walk->iv = req->iv; walk->oiv = req->iv; |
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if (unlikely(!walk->total)) return 0; |
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walk->flags &= ~SKCIPHER_WALK_PHYS; |
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scatterwalk_start(&walk->in, req->src); scatterwalk_start(&walk->out, req->dst); scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2); scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2); |
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scatterwalk_done(&walk->in, 0, walk->total); scatterwalk_done(&walk->out, 0, walk->total); |
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if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) walk->flags |= SKCIPHER_WALK_SLEEP; else walk->flags &= ~SKCIPHER_WALK_SLEEP; walk->blocksize = crypto_aead_blocksize(tfm); |
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walk->stride = crypto_aead_chunksize(tfm); |
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walk->ivsize = crypto_aead_ivsize(tfm); walk->alignmask = crypto_aead_alignmask(tfm); err = skcipher_walk_first(walk); if (atomic) walk->flags &= ~SKCIPHER_WALK_SLEEP; return err; } |
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int skcipher_walk_aead_encrypt(struct skcipher_walk *walk, struct aead_request *req, bool atomic) { walk->total = req->cryptlen; return skcipher_walk_aead_common(walk, req, atomic); } EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt); int skcipher_walk_aead_decrypt(struct skcipher_walk *walk, struct aead_request *req, bool atomic) { struct crypto_aead *tfm = crypto_aead_reqtfm(req); walk->total = req->cryptlen - crypto_aead_authsize(tfm); return skcipher_walk_aead_common(walk, req, atomic); } EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt); |
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static void skcipher_set_needkey(struct crypto_skcipher *tfm) { |
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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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static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen) { unsigned long alignmask = crypto_skcipher_alignmask(tfm); struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); u8 *buffer, *alignbuffer; unsigned long absize; int ret; absize = keylen + alignmask; buffer = kmalloc(absize, GFP_ATOMIC); if (!buffer) return -ENOMEM; alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); memcpy(alignbuffer, key, keylen); ret = cipher->setkey(tfm, alignbuffer, keylen); |
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kfree_sensitive(buffer); |
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return ret; } |
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int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, |
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unsigned int keylen) { struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); unsigned long alignmask = crypto_skcipher_alignmask(tfm); |
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int err; |
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if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) |
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return -EINVAL; |
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if ((unsigned long)key & alignmask) |
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err = skcipher_setkey_unaligned(tfm, key, keylen); else err = cipher->setkey(tfm, key, keylen); |
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if (unlikely(err)) { skcipher_set_needkey(tfm); |
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return err; |
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} |
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crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); return 0; |
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} |
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EXPORT_SYMBOL_GPL(crypto_skcipher_setkey); |
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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 |
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ret = crypto_skcipher_alg(tfm)->encrypt(req); |
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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 |
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ret = crypto_skcipher_alg(tfm)->decrypt(req); |
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crypto_stats_skcipher_decrypt(cryptlen, ret, alg); return ret; } EXPORT_SYMBOL_GPL(crypto_skcipher_decrypt); |
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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); } |
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static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm) { |
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struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); |
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skcipher_set_needkey(skcipher); |
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if (alg->exit) skcipher->base.exit = crypto_skcipher_exit_tfm; |
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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) |
d8c34b949
|
662 |
__maybe_unused; |
4e6c3df4d
|
663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 |
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 "); seq_printf(m, "async : %s ", alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); seq_printf(m, "blocksize : %u ", alg->cra_blocksize); seq_printf(m, "min keysize : %u ", skcipher->min_keysize); seq_printf(m, "max keysize : %u ", skcipher->max_keysize); seq_printf(m, "ivsize : %u ", skcipher->ivsize); seq_printf(m, "chunksize : %u ", skcipher->chunksize); |
c821f6ab2
|
683 684 |
seq_printf(m, "walksize : %u ", skcipher->walksize); |
7a7ffe65c
|
685 |
} |
4e6c3df4d
|
686 687 688 689 690 691 |
#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); |
37db69e0b
|
692 693 694 695 |
memset(&rblkcipher, 0, sizeof(rblkcipher)); strscpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type)); strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); |
4e6c3df4d
|
696 697 698 699 700 |
rblkcipher.blocksize = alg->cra_blocksize; rblkcipher.min_keysize = skcipher->min_keysize; rblkcipher.max_keysize = skcipher->max_keysize; rblkcipher.ivsize = skcipher->ivsize; |
37db69e0b
|
701 702 |
return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, sizeof(rblkcipher), &rblkcipher); |
4e6c3df4d
|
703 704 705 706 707 708 709 |
} #else static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg) { return -ENOSYS; } #endif |
53253064a
|
710 |
static const struct crypto_type crypto_skcipher_type = { |
89873b441
|
711 |
.extsize = crypto_alg_extsize, |
7a7ffe65c
|
712 |
.init_tfm = crypto_skcipher_init_tfm, |
4e6c3df4d
|
713 714 715 716 717 |
.free = crypto_skcipher_free_instance, #ifdef CONFIG_PROC_FS .show = crypto_skcipher_show, #endif .report = crypto_skcipher_report, |
7a7ffe65c
|
718 |
.maskclear = ~CRYPTO_ALG_TYPE_MASK, |
c65058b75
|
719 |
.maskset = CRYPTO_ALG_TYPE_MASK, |
4e6c3df4d
|
720 |
.type = CRYPTO_ALG_TYPE_SKCIPHER, |
7a7ffe65c
|
721 722 |
.tfmsize = offsetof(struct crypto_skcipher, base), }; |
3a01d0ee2
|
723 |
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, |
b9f76dddb
|
724 725 |
struct crypto_instance *inst, const char *name, u32 type, u32 mask) |
4e6c3df4d
|
726 |
{ |
53253064a
|
727 |
spawn->base.frontend = &crypto_skcipher_type; |
de95c9574
|
728 |
return crypto_grab_spawn(&spawn->base, inst, name, type, mask); |
4e6c3df4d
|
729 |
} |
3a01d0ee2
|
730 |
EXPORT_SYMBOL_GPL(crypto_grab_skcipher); |
4e6c3df4d
|
731 |
|
7a7ffe65c
|
732 733 734 |
struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, u32 type, u32 mask) { |
53253064a
|
735 |
return crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask); |
7a7ffe65c
|
736 737 |
} EXPORT_SYMBOL_GPL(crypto_alloc_skcipher); |
b350bee5e
|
738 739 740 741 742 743 744 |
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; |
53253064a
|
745 |
tfm = crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask); |
b350bee5e
|
746 747 748 749 750 751 752 753 754 755 756 757 758 759 |
/* * 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); |
d3ca75a8b
|
760 |
int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask) |
4e6c3df4d
|
761 |
{ |
53253064a
|
762 |
return crypto_type_has_alg(alg_name, &crypto_skcipher_type, type, mask); |
4e6c3df4d
|
763 |
} |
d3ca75a8b
|
764 |
EXPORT_SYMBOL_GPL(crypto_has_skcipher); |
4e6c3df4d
|
765 766 767 768 |
static int skcipher_prepare_alg(struct skcipher_alg *alg) { struct crypto_alg *base = &alg->base; |
c821f6ab2
|
769 770 |
if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 || alg->walksize > PAGE_SIZE / 8) |
4e6c3df4d
|
771 772 773 774 |
return -EINVAL; if (!alg->chunksize) alg->chunksize = base->cra_blocksize; |
c821f6ab2
|
775 776 |
if (!alg->walksize) alg->walksize = alg->chunksize; |
4e6c3df4d
|
777 |
|
53253064a
|
778 |
base->cra_type = &crypto_skcipher_type; |
4e6c3df4d
|
779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 |
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; |
d4fdc2dfa
|
837 838 |
if (WARN_ON(!inst->free)) return -EINVAL; |
4e6c3df4d
|
839 840 841 842 843 844 845 |
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); |
0872da16d
|
846 847 848 849 |
static int skcipher_setkey_simple(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen) { struct crypto_cipher *cipher = skcipher_cipher_simple(tfm); |
0872da16d
|
850 851 852 853 |
crypto_cipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); crypto_cipher_set_flags(cipher, crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_REQ_MASK); |
af5034e8e
|
854 |
return crypto_cipher_setkey(cipher, key, keylen); |
0872da16d
|
855 856 857 858 859 |
} static int skcipher_init_tfm_simple(struct crypto_skcipher *tfm) { struct skcipher_instance *inst = skcipher_alg_instance(tfm); |
d5ed3b65f
|
860 |
struct crypto_cipher_spawn *spawn = skcipher_instance_ctx(inst); |
0872da16d
|
861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 |
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) { |
aacd5b4cf
|
881 |
crypto_drop_cipher(skcipher_instance_ctx(inst)); |
0872da16d
|
882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 |
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 |
0872da16d
|
897 898 899 900 |
* * Return: a pointer to the new instance, or an ERR_PTR(). The caller still * needs to register the instance. */ |
b3c16bfc6
|
901 902 |
struct skcipher_instance *skcipher_alloc_instance_simple( struct crypto_template *tmpl, struct rtattr **tb) |
0872da16d
|
903 |
{ |
0872da16d
|
904 |
u32 mask; |
aacd5b4cf
|
905 906 907 |
struct skcipher_instance *inst; struct crypto_cipher_spawn *spawn; struct crypto_alg *cipher_alg; |
0872da16d
|
908 |
int err; |
7bcb2c99f
|
909 910 911 |
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask); if (err) return ERR_PTR(err); |
0872da16d
|
912 913 |
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
aacd5b4cf
|
914 915 |
if (!inst) return ERR_PTR(-ENOMEM); |
0872da16d
|
916 |
spawn = skcipher_instance_ctx(inst); |
aacd5b4cf
|
917 918 |
err = crypto_grab_cipher(spawn, skcipher_crypto_instance(inst), crypto_attr_alg_name(tb[1]), 0, mask); |
0872da16d
|
919 920 |
if (err) goto err_free_inst; |
aacd5b4cf
|
921 |
cipher_alg = crypto_spawn_cipher_alg(spawn); |
0872da16d
|
922 |
|
aacd5b4cf
|
923 924 |
err = crypto_inst_setname(skcipher_crypto_instance(inst), tmpl->name, cipher_alg); |
0872da16d
|
925 926 |
if (err) goto err_free_inst; |
aacd5b4cf
|
927 |
|
0872da16d
|
928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 |
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; |
0872da16d
|
943 944 945 |
return inst; err_free_inst: |
aacd5b4cf
|
946 |
skcipher_free_instance_simple(inst); |
0872da16d
|
947 948 949 |
return ERR_PTR(err); } EXPORT_SYMBOL_GPL(skcipher_alloc_instance_simple); |
7a7ffe65c
|
950 951 |
MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Symmetric key cipher type"); |