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-rw-r--r--crypto/ahash.c688
1 files changed, 688 insertions, 0 deletions
diff --git a/crypto/ahash.c b/crypto/ahash.c
new file mode 100644
index 0000000000..709ef09407
--- /dev/null
+++ b/crypto/ahash.c
@@ -0,0 +1,688 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Asynchronous Cryptographic Hash operations.
+ *
+ * This is the asynchronous version of hash.c with notification of
+ * completion via a callback.
+ *
+ * Copyright (c) 2008 Loc Ho <lho@amcc.com>
+ */
+
+#include <crypto/scatterwalk.h>
+#include <linux/cryptouser.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/string.h>
+#include <net/netlink.h>
+
+#include "hash.h"
+
+static const struct crypto_type crypto_ahash_type;
+
+struct ahash_request_priv {
+ crypto_completion_t complete;
+ void *data;
+ u8 *result;
+ u32 flags;
+ void *ubuf[] CRYPTO_MINALIGN_ATTR;
+};
+
+static int hash_walk_next(struct crypto_hash_walk *walk)
+{
+ unsigned int alignmask = walk->alignmask;
+ unsigned int offset = walk->offset;
+ unsigned int nbytes = min(walk->entrylen,
+ ((unsigned int)(PAGE_SIZE)) - offset);
+
+ walk->data = kmap_local_page(walk->pg);
+ walk->data += offset;
+
+ if (offset & alignmask) {
+ unsigned int unaligned = alignmask + 1 - (offset & alignmask);
+
+ if (nbytes > unaligned)
+ nbytes = unaligned;
+ }
+
+ walk->entrylen -= nbytes;
+ return nbytes;
+}
+
+static int hash_walk_new_entry(struct crypto_hash_walk *walk)
+{
+ struct scatterlist *sg;
+
+ sg = walk->sg;
+ walk->offset = sg->offset;
+ walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
+ walk->offset = offset_in_page(walk->offset);
+ walk->entrylen = sg->length;
+
+ if (walk->entrylen > walk->total)
+ walk->entrylen = walk->total;
+ walk->total -= walk->entrylen;
+
+ return hash_walk_next(walk);
+}
+
+int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
+{
+ unsigned int alignmask = walk->alignmask;
+
+ walk->data -= walk->offset;
+
+ if (walk->entrylen && (walk->offset & alignmask) && !err) {
+ unsigned int nbytes;
+
+ walk->offset = ALIGN(walk->offset, alignmask + 1);
+ nbytes = min(walk->entrylen,
+ (unsigned int)(PAGE_SIZE - walk->offset));
+ if (nbytes) {
+ walk->entrylen -= nbytes;
+ walk->data += walk->offset;
+ return nbytes;
+ }
+ }
+
+ kunmap_local(walk->data);
+ crypto_yield(walk->flags);
+
+ if (err)
+ return err;
+
+ if (walk->entrylen) {
+ walk->offset = 0;
+ walk->pg++;
+ return hash_walk_next(walk);
+ }
+
+ if (!walk->total)
+ return 0;
+
+ walk->sg = sg_next(walk->sg);
+
+ return hash_walk_new_entry(walk);
+}
+EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
+
+int crypto_hash_walk_first(struct ahash_request *req,
+ struct crypto_hash_walk *walk)
+{
+ walk->total = req->nbytes;
+
+ if (!walk->total) {
+ walk->entrylen = 0;
+ return 0;
+ }
+
+ walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
+ walk->sg = req->src;
+ walk->flags = req->base.flags;
+
+ return hash_walk_new_entry(walk);
+}
+EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
+
+static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ unsigned long alignmask = crypto_ahash_alignmask(tfm);
+ int ret;
+ u8 *buffer, *alignbuffer;
+ unsigned long absize;
+
+ absize = keylen + alignmask;
+ buffer = kmalloc(absize, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
+ memcpy(alignbuffer, key, keylen);
+ ret = tfm->setkey(tfm, alignbuffer, keylen);
+ kfree_sensitive(buffer);
+ return ret;
+}
+
+static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ return -ENOSYS;
+}
+
+static void ahash_set_needkey(struct crypto_ahash *tfm)
+{
+ const struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
+
+ if (tfm->setkey != ahash_nosetkey &&
+ !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
+ crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
+}
+
+int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ unsigned long alignmask = crypto_ahash_alignmask(tfm);
+ int err;
+
+ if ((unsigned long)key & alignmask)
+ err = ahash_setkey_unaligned(tfm, key, keylen);
+ else
+ err = tfm->setkey(tfm, key, keylen);
+
+ if (unlikely(err)) {
+ ahash_set_needkey(tfm);
+ return err;
+ }
+
+ crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
+
+static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt,
+ bool has_state)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ unsigned long alignmask = crypto_ahash_alignmask(tfm);
+ unsigned int ds = crypto_ahash_digestsize(tfm);
+ struct ahash_request *subreq;
+ unsigned int subreq_size;
+ unsigned int reqsize;
+ u8 *result;
+ gfp_t gfp;
+ u32 flags;
+
+ subreq_size = sizeof(*subreq);
+ reqsize = crypto_ahash_reqsize(tfm);
+ reqsize = ALIGN(reqsize, crypto_tfm_ctx_alignment());
+ subreq_size += reqsize;
+ subreq_size += ds;
+ subreq_size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
+
+ flags = ahash_request_flags(req);
+ gfp = (flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL : GFP_ATOMIC;
+ subreq = kmalloc(subreq_size, gfp);
+ if (!subreq)
+ return -ENOMEM;
+
+ ahash_request_set_tfm(subreq, tfm);
+ ahash_request_set_callback(subreq, flags, cplt, req);
+
+ result = (u8 *)(subreq + 1) + reqsize;
+ result = PTR_ALIGN(result, alignmask + 1);
+
+ ahash_request_set_crypt(subreq, req->src, result, req->nbytes);
+
+ if (has_state) {
+ void *state;
+
+ state = kmalloc(crypto_ahash_statesize(tfm), gfp);
+ if (!state) {
+ kfree(subreq);
+ return -ENOMEM;
+ }
+
+ crypto_ahash_export(req, state);
+ crypto_ahash_import(subreq, state);
+ kfree_sensitive(state);
+ }
+
+ req->priv = subreq;
+
+ return 0;
+}
+
+static void ahash_restore_req(struct ahash_request *req, int err)
+{
+ struct ahash_request *subreq = req->priv;
+
+ if (!err)
+ memcpy(req->result, subreq->result,
+ crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
+
+ req->priv = NULL;
+
+ kfree_sensitive(subreq);
+}
+
+static void ahash_op_unaligned_done(void *data, int err)
+{
+ struct ahash_request *areq = data;
+
+ if (err == -EINPROGRESS)
+ goto out;
+
+ /* First copy req->result into req->priv.result */
+ ahash_restore_req(areq, err);
+
+out:
+ /* Complete the ORIGINAL request. */
+ ahash_request_complete(areq, err);
+}
+
+static int ahash_op_unaligned(struct ahash_request *req,
+ int (*op)(struct ahash_request *),
+ bool has_state)
+{
+ int err;
+
+ err = ahash_save_req(req, ahash_op_unaligned_done, has_state);
+ if (err)
+ return err;
+
+ err = op(req->priv);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return err;
+
+ ahash_restore_req(req, err);
+
+ return err;
+}
+
+static int crypto_ahash_op(struct ahash_request *req,
+ int (*op)(struct ahash_request *),
+ bool has_state)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ unsigned long alignmask = crypto_ahash_alignmask(tfm);
+ int err;
+
+ if ((unsigned long)req->result & alignmask)
+ err = ahash_op_unaligned(req, op, has_state);
+ else
+ err = op(req);
+
+ return crypto_hash_errstat(crypto_hash_alg_common(tfm), err);
+}
+
+int crypto_ahash_final(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
+
+ if (IS_ENABLED(CONFIG_CRYPTO_STATS))
+ atomic64_inc(&hash_get_stat(alg)->hash_cnt);
+
+ return crypto_ahash_op(req, tfm->final, true);
+}
+EXPORT_SYMBOL_GPL(crypto_ahash_final);
+
+int crypto_ahash_finup(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
+
+ if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
+ struct crypto_istat_hash *istat = hash_get_stat(alg);
+
+ atomic64_inc(&istat->hash_cnt);
+ atomic64_add(req->nbytes, &istat->hash_tlen);
+ }
+
+ return crypto_ahash_op(req, tfm->finup, true);
+}
+EXPORT_SYMBOL_GPL(crypto_ahash_finup);
+
+int crypto_ahash_digest(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
+
+ if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
+ struct crypto_istat_hash *istat = hash_get_stat(alg);
+
+ atomic64_inc(&istat->hash_cnt);
+ atomic64_add(req->nbytes, &istat->hash_tlen);
+ }
+
+ if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+ return crypto_hash_errstat(alg, -ENOKEY);
+
+ return crypto_ahash_op(req, tfm->digest, false);
+}
+EXPORT_SYMBOL_GPL(crypto_ahash_digest);
+
+static void ahash_def_finup_done2(void *data, int err)
+{
+ struct ahash_request *areq = data;
+
+ if (err == -EINPROGRESS)
+ return;
+
+ ahash_restore_req(areq, err);
+
+ ahash_request_complete(areq, err);
+}
+
+static int ahash_def_finup_finish1(struct ahash_request *req, int err)
+{
+ struct ahash_request *subreq = req->priv;
+
+ if (err)
+ goto out;
+
+ subreq->base.complete = ahash_def_finup_done2;
+
+ err = crypto_ahash_reqtfm(req)->final(subreq);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return err;
+
+out:
+ ahash_restore_req(req, err);
+ return err;
+}
+
+static void ahash_def_finup_done1(void *data, int err)
+{
+ struct ahash_request *areq = data;
+ struct ahash_request *subreq;
+
+ if (err == -EINPROGRESS)
+ goto out;
+
+ subreq = areq->priv;
+ subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
+
+ err = ahash_def_finup_finish1(areq, err);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return;
+
+out:
+ ahash_request_complete(areq, err);
+}
+
+static int ahash_def_finup(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ int err;
+
+ err = ahash_save_req(req, ahash_def_finup_done1, true);
+ if (err)
+ return err;
+
+ err = tfm->update(req->priv);
+ if (err == -EINPROGRESS || err == -EBUSY)
+ return err;
+
+ return ahash_def_finup_finish1(req, err);
+}
+
+static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
+{
+ struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
+ struct ahash_alg *alg = crypto_ahash_alg(hash);
+
+ alg->exit_tfm(hash);
+}
+
+static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
+{
+ struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
+ struct ahash_alg *alg = crypto_ahash_alg(hash);
+
+ hash->setkey = ahash_nosetkey;
+
+ crypto_ahash_set_statesize(hash, alg->halg.statesize);
+
+ if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
+ return crypto_init_shash_ops_async(tfm);
+
+ hash->init = alg->init;
+ hash->update = alg->update;
+ hash->final = alg->final;
+ hash->finup = alg->finup ?: ahash_def_finup;
+ hash->digest = alg->digest;
+ hash->export = alg->export;
+ hash->import = alg->import;
+
+ if (alg->setkey) {
+ hash->setkey = alg->setkey;
+ ahash_set_needkey(hash);
+ }
+
+ if (alg->exit_tfm)
+ tfm->exit = crypto_ahash_exit_tfm;
+
+ return alg->init_tfm ? alg->init_tfm(hash) : 0;
+}
+
+static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
+{
+ if (alg->cra_type != &crypto_ahash_type)
+ return sizeof(struct crypto_shash *);
+
+ return crypto_alg_extsize(alg);
+}
+
+static void crypto_ahash_free_instance(struct crypto_instance *inst)
+{
+ struct ahash_instance *ahash = ahash_instance(inst);
+
+ ahash->free(ahash);
+}
+
+static int __maybe_unused crypto_ahash_report(
+ struct sk_buff *skb, struct crypto_alg *alg)
+{
+ struct crypto_report_hash rhash;
+
+ memset(&rhash, 0, sizeof(rhash));
+
+ strscpy(rhash.type, "ahash", sizeof(rhash.type));
+
+ rhash.blocksize = alg->cra_blocksize;
+ rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
+
+ return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
+}
+
+static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
+ __maybe_unused;
+static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
+{
+ seq_printf(m, "type : ahash\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, "digestsize : %u\n",
+ __crypto_hash_alg_common(alg)->digestsize);
+}
+
+static int __maybe_unused crypto_ahash_report_stat(
+ struct sk_buff *skb, struct crypto_alg *alg)
+{
+ return crypto_hash_report_stat(skb, alg, "ahash");
+}
+
+static const struct crypto_type crypto_ahash_type = {
+ .extsize = crypto_ahash_extsize,
+ .init_tfm = crypto_ahash_init_tfm,
+ .free = crypto_ahash_free_instance,
+#ifdef CONFIG_PROC_FS
+ .show = crypto_ahash_show,
+#endif
+#if IS_ENABLED(CONFIG_CRYPTO_USER)
+ .report = crypto_ahash_report,
+#endif
+#ifdef CONFIG_CRYPTO_STATS
+ .report_stat = crypto_ahash_report_stat,
+#endif
+ .maskclear = ~CRYPTO_ALG_TYPE_MASK,
+ .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
+ .type = CRYPTO_ALG_TYPE_AHASH,
+ .tfmsize = offsetof(struct crypto_ahash, base),
+};
+
+int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
+ struct crypto_instance *inst,
+ const char *name, u32 type, u32 mask)
+{
+ spawn->base.frontend = &crypto_ahash_type;
+ return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_grab_ahash);
+
+struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
+ u32 mask)
+{
+ return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
+
+int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
+{
+ return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_has_ahash);
+
+struct crypto_ahash *crypto_clone_ahash(struct crypto_ahash *hash)
+{
+ struct hash_alg_common *halg = crypto_hash_alg_common(hash);
+ struct crypto_tfm *tfm = crypto_ahash_tfm(hash);
+ struct crypto_ahash *nhash;
+ struct ahash_alg *alg;
+ int err;
+
+ if (!crypto_hash_alg_has_setkey(halg)) {
+ tfm = crypto_tfm_get(tfm);
+ if (IS_ERR(tfm))
+ return ERR_CAST(tfm);
+
+ return hash;
+ }
+
+ nhash = crypto_clone_tfm(&crypto_ahash_type, tfm);
+
+ if (IS_ERR(nhash))
+ return nhash;
+
+ nhash->init = hash->init;
+ nhash->update = hash->update;
+ nhash->final = hash->final;
+ nhash->finup = hash->finup;
+ nhash->digest = hash->digest;
+ nhash->export = hash->export;
+ nhash->import = hash->import;
+ nhash->setkey = hash->setkey;
+ nhash->reqsize = hash->reqsize;
+ nhash->statesize = hash->statesize;
+
+ if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
+ return crypto_clone_shash_ops_async(nhash, hash);
+
+ err = -ENOSYS;
+ alg = crypto_ahash_alg(hash);
+ if (!alg->clone_tfm)
+ goto out_free_nhash;
+
+ err = alg->clone_tfm(nhash, hash);
+ if (err)
+ goto out_free_nhash;
+
+ return nhash;
+
+out_free_nhash:
+ crypto_free_ahash(nhash);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(crypto_clone_ahash);
+
+static int ahash_prepare_alg(struct ahash_alg *alg)
+{
+ struct crypto_alg *base = &alg->halg.base;
+ int err;
+
+ if (alg->halg.statesize == 0)
+ return -EINVAL;
+
+ err = hash_prepare_alg(&alg->halg);
+ if (err)
+ return err;
+
+ base->cra_type = &crypto_ahash_type;
+ base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
+
+ return 0;
+}
+
+int crypto_register_ahash(struct ahash_alg *alg)
+{
+ struct crypto_alg *base = &alg->halg.base;
+ int err;
+
+ err = ahash_prepare_alg(alg);
+ if (err)
+ return err;
+
+ return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_ahash);
+
+void crypto_unregister_ahash(struct ahash_alg *alg)
+{
+ crypto_unregister_alg(&alg->halg.base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
+
+int crypto_register_ahashes(struct ahash_alg *algs, int count)
+{
+ int i, ret;
+
+ for (i = 0; i < count; i++) {
+ ret = crypto_register_ahash(&algs[i]);
+ if (ret)
+ goto err;
+ }
+
+ return 0;
+
+err:
+ for (--i; i >= 0; --i)
+ crypto_unregister_ahash(&algs[i]);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_register_ahashes);
+
+void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
+{
+ int i;
+
+ for (i = count - 1; i >= 0; --i)
+ crypto_unregister_ahash(&algs[i]);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
+
+int ahash_register_instance(struct crypto_template *tmpl,
+ struct ahash_instance *inst)
+{
+ int err;
+
+ if (WARN_ON(!inst->free))
+ return -EINVAL;
+
+ err = ahash_prepare_alg(&inst->alg);
+ if (err)
+ return err;
+
+ return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
+}
+EXPORT_SYMBOL_GPL(ahash_register_instance);
+
+bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
+{
+ struct crypto_alg *alg = &halg->base;
+
+ if (alg->cra_type != &crypto_ahash_type)
+ return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
+
+ return __crypto_ahash_alg(alg)->setkey != NULL;
+}
+EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 02:56:48 +0000