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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * 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 <[email protected]>
- */
- #include <crypto/internal/aead.h>
- #include <crypto/internal/cipher.h>
- #include <crypto/internal/skcipher.h>
- #include <crypto/scatterwalk.h>
- #include <linux/bug.h>
- #include <linux/cryptouser.h>
- #include <linux/compiler.h>
- #include <linux/list.h>
- #include <linux/module.h>
- #include <linux/rtnetlink.h>
- #include <linux/seq_file.h>
- #include <net/netlink.h>
- #include "internal.h"
- 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);
- }
- static int skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize)
- {
- 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);
- return 0;
- }
- int skcipher_walk_done(struct skcipher_walk *walk, int err)
- {
- unsigned int n = walk->nbytes;
- unsigned int nbytes = 0;
- if (!n)
- goto finish;
- if (likely(err >= 0)) {
- n -= err;
- nbytes = walk->total - n;
- }
- if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS |
- SKCIPHER_WALK_SLOW |
- SKCIPHER_WALK_COPY |
- SKCIPHER_WALK_DIFF)))) {
- 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)) {
- if (err > 0) {
- /*
- * 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.
- */
- err = -EINVAL;
- nbytes = 0;
- } else
- n = skcipher_done_slow(walk, n);
- }
- if (err > 0)
- err = 0;
- walk->total = nbytes;
- walk->nbytes = 0;
- scatterwalk_advance(&walk->in, n);
- scatterwalk_advance(&walk->out, n);
- scatterwalk_done(&walk->in, 0, nbytes);
- scatterwalk_done(&walk->out, 1, nbytes);
- if (nbytes) {
- crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ?
- CRYPTO_TFM_REQ_MAY_SLEEP : 0);
- return skcipher_walk_next(walk);
- }
- finish:
- /* 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);
- data = skcipher_get_spot(data, walk->stride);
- }
- scatterwalk_copychunks(data, &p->dst, p->len, 1);
- if (offset_in_page(p->data) + p->len + walk->stride >
- 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) {
- if (!walk->buffer)
- walk->buffer = walk->page;
- buffer = walk->buffer;
- 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);
- if (offset_in_page(walk->page) + walk->nbytes + walk->stride >
- 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;
- bsize = min(walk->stride, max(n, walk->blocksize));
- 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;
- }
- static int skcipher_copy_iv(struct skcipher_walk *walk)
- {
- unsigned a = crypto_tfm_ctx_alignment() - 1;
- unsigned alignmask = walk->alignmask;
- unsigned ivsize = walk->ivsize;
- unsigned bs = walk->stride;
- unsigned aligned_bs;
- unsigned size;
- u8 *iv;
- aligned_bs = ALIGN(bs, alignmask + 1);
- /* 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)
- {
- if (WARN_ON_ONCE(in_hardirq()))
- return -EDEADLK;
- walk->buffer = NULL;
- if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
- int err = skcipher_copy_iv(walk);
- if (err)
- return err;
- }
- walk->page = NULL;
- 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);
- walk->total = req->cryptlen;
- walk->nbytes = 0;
- walk->iv = req->iv;
- walk->oiv = req->iv;
- if (unlikely(!walk->total))
- return 0;
- scatterwalk_start(&walk->in, req->src);
- scatterwalk_start(&walk->out, req->dst);
- 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);
- walk->stride = crypto_skcipher_walksize(tfm);
- 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;
- might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
- walk->flags &= ~SKCIPHER_WALK_PHYS;
- err = skcipher_walk_skcipher(walk, req);
- walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0;
- return err;
- }
- EXPORT_SYMBOL_GPL(skcipher_walk_virt);
- int skcipher_walk_async(struct skcipher_walk *walk,
- struct skcipher_request *req)
- {
- walk->flags |= SKCIPHER_WALK_PHYS;
- INIT_LIST_HEAD(&walk->buffers);
- return skcipher_walk_skcipher(walk, req);
- }
- EXPORT_SYMBOL_GPL(skcipher_walk_async);
- static int skcipher_walk_aead_common(struct skcipher_walk *walk,
- struct aead_request *req, bool atomic)
- {
- struct crypto_aead *tfm = crypto_aead_reqtfm(req);
- int err;
- walk->nbytes = 0;
- walk->iv = req->iv;
- walk->oiv = req->iv;
- if (unlikely(!walk->total))
- return 0;
- walk->flags &= ~SKCIPHER_WALK_PHYS;
- scatterwalk_start(&walk->in, req->src);
- scatterwalk_start(&walk->out, req->dst);
- scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2);
- scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2);
- scatterwalk_done(&walk->in, 0, walk->total);
- scatterwalk_done(&walk->out, 0, walk->total);
- if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP)
- walk->flags |= SKCIPHER_WALK_SLEEP;
- else
- walk->flags &= ~SKCIPHER_WALK_SLEEP;
- walk->blocksize = crypto_aead_blocksize(tfm);
- walk->stride = crypto_aead_chunksize(tfm);
- walk->ivsize = crypto_aead_ivsize(tfm);
- walk->alignmask = crypto_aead_alignmask(tfm);
- err = skcipher_walk_first(walk);
- if (atomic)
- walk->flags &= ~SKCIPHER_WALK_SLEEP;
- return err;
- }
- int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
- struct aead_request *req, bool atomic)
- {
- walk->total = req->cryptlen;
- return skcipher_walk_aead_common(walk, req, atomic);
- }
- EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt);
- int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
- struct aead_request *req, bool atomic)
- {
- struct crypto_aead *tfm = crypto_aead_reqtfm(req);
- walk->total = req->cryptlen - crypto_aead_authsize(tfm);
- return skcipher_walk_aead_common(walk, req, atomic);
- }
- EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt);
- static void skcipher_set_needkey(struct crypto_skcipher *tfm)
- {
- if (crypto_skcipher_max_keysize(tfm) != 0)
- crypto_skcipher_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
- }
- static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm,
- const u8 *key, unsigned int keylen)
- {
- unsigned long alignmask = crypto_skcipher_alignmask(tfm);
- struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
- u8 *buffer, *alignbuffer;
- unsigned long absize;
- int ret;
- absize = keylen + alignmask;
- buffer = kmalloc(absize, GFP_ATOMIC);
- if (!buffer)
- return -ENOMEM;
- alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
- memcpy(alignbuffer, key, keylen);
- ret = cipher->setkey(tfm, alignbuffer, keylen);
- kfree_sensitive(buffer);
- return ret;
- }
- int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
- unsigned int keylen)
- {
- struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
- unsigned long alignmask = crypto_skcipher_alignmask(tfm);
- int err;
- if (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");
- MODULE_IMPORT_NS(CRYPTO_INTERNAL);
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