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-rw-r--r--crypto/skcipher.c1035
1 files changed, 1035 insertions, 0 deletions
diff --git a/crypto/skcipher.c b/crypto/skcipher.c
new file mode 100644
index 0000000000..7b275716cf
--- /dev/null
+++ b/crypto/skcipher.c
@@ -0,0 +1,1035 @@
+// 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 <herbert@gondor.apana.org.au>
+ */
+
+#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/err.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/string.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_map_src(struct skcipher_walk *walk)
+{
+ walk->src.virt.addr = scatterwalk_map(&walk->in);
+}
+
+static inline void skcipher_map_dst(struct skcipher_walk *walk)
+{
+ walk->dst.virt.addr = scatterwalk_map(&walk->out);
+}
+
+static inline void skcipher_unmap_src(struct skcipher_walk *walk)
+{
+ scatterwalk_unmap(walk->src.virt.addr);
+}
+
+static inline void skcipher_unmap_dst(struct skcipher_walk *walk)
+{
+ scatterwalk_unmap(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 inline struct skcipher_alg *__crypto_skcipher_alg(
+ struct crypto_alg *alg)
+{
+ return container_of(alg, struct skcipher_alg, base);
+}
+
+static inline struct crypto_istat_cipher *skcipher_get_stat(
+ struct skcipher_alg *alg)
+{
+#ifdef CONFIG_CRYPTO_STATS
+ return &alg->stat;
+#else
+ return NULL;
+#endif
+}
+
+static inline int crypto_skcipher_errstat(struct skcipher_alg *alg, int err)
+{
+ struct crypto_istat_cipher *istat = skcipher_get_stat(alg);
+
+ if (!IS_ENABLED(CONFIG_CRYPTO_STATS))
+ return err;
+
+ if (err && err != -EINPROGRESS && err != -EBUSY)
+ atomic64_inc(&istat->err_cnt);
+
+ return err;
+}
+
+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 skcipher_alg *alg = crypto_skcipher_alg(tfm);
+ int ret;
+
+ if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
+ struct crypto_istat_cipher *istat = skcipher_get_stat(alg);
+
+ atomic64_inc(&istat->encrypt_cnt);
+ atomic64_add(req->cryptlen, &istat->encrypt_tlen);
+ }
+
+ if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+ ret = -ENOKEY;
+ else
+ ret = alg->encrypt(req);
+
+ return crypto_skcipher_errstat(alg, ret);
+}
+EXPORT_SYMBOL_GPL(crypto_skcipher_encrypt);
+
+int crypto_skcipher_decrypt(struct skcipher_request *req)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+ int ret;
+
+ if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
+ struct crypto_istat_cipher *istat = skcipher_get_stat(alg);
+
+ atomic64_inc(&istat->decrypt_cnt);
+ atomic64_add(req->cryptlen, &istat->decrypt_tlen);
+ }
+
+ if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+ ret = -ENOKEY;
+ else
+ ret = alg->decrypt(req);
+
+ return crypto_skcipher_errstat(alg, 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 = __crypto_skcipher_alg(alg);
+
+ 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);
+}
+
+static int __maybe_unused crypto_skcipher_report(
+ struct sk_buff *skb, struct crypto_alg *alg)
+{
+ struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg);
+ struct crypto_report_blkcipher rblkcipher;
+
+ 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);
+}
+
+static int __maybe_unused crypto_skcipher_report_stat(
+ struct sk_buff *skb, struct crypto_alg *alg)
+{
+ struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg);
+ struct crypto_istat_cipher *istat;
+ struct crypto_stat_cipher rcipher;
+
+ istat = skcipher_get_stat(skcipher);
+
+ memset(&rcipher, 0, sizeof(rcipher));
+
+ strscpy(rcipher.type, "cipher", sizeof(rcipher.type));
+
+ rcipher.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt);
+ rcipher.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen);
+ rcipher.stat_decrypt_cnt = atomic64_read(&istat->decrypt_cnt);
+ rcipher.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen);
+ rcipher.stat_err_cnt = atomic64_read(&istat->err_cnt);
+
+ return nla_put(skb, CRYPTOCFGA_STAT_CIPHER, sizeof(rcipher), &rcipher);
+}
+
+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
+#if IS_ENABLED(CONFIG_CRYPTO_USER)
+ .report = crypto_skcipher_report,
+#endif
+#ifdef CONFIG_CRYPTO_STATS
+ .report_stat = crypto_skcipher_report_stat,
+#endif
+ .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 | CRYPTO_ALG_SKCIPHER_REQSIZE_LARGE;
+
+ 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_istat_cipher *istat = skcipher_get_stat(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;
+
+ if (IS_ENABLED(CONFIG_CRYPTO_STATS))
+ memset(istat, 0, sizeof(*istat));
+
+ 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);