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- /*
- * 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>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- */
- #include <crypto/internal/hash.h>
- #include <crypto/scatterwalk.h>
- #include <linux/bug.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/cryptouser.h>
- #include <net/netlink.h>
- #include "internal.h"
- struct ahash_request_priv {
- crypto_completion_t complete;
- void *data;
- u8 *result;
- u32 flags;
- void *ubuf[] CRYPTO_MINALIGN_ATTR;
- };
- static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
- {
- return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
- halg);
- }
- 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);
- if (walk->flags & CRYPTO_ALG_ASYNC)
- walk->data = kmap(walk->pg);
- else
- walk->data = kmap_atomic(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;
- unsigned int nbytes = walk->entrylen;
- walk->data -= walk->offset;
- if (nbytes && walk->offset & alignmask && !err) {
- walk->offset = ALIGN(walk->offset, alignmask + 1);
- nbytes = min(nbytes,
- ((unsigned int)(PAGE_SIZE)) - walk->offset);
- walk->entrylen -= nbytes;
- if (nbytes) {
- walk->data += walk->offset;
- return nbytes;
- }
- }
- if (walk->flags & CRYPTO_ALG_ASYNC)
- kunmap(walk->pg);
- else {
- kunmap_atomic(walk->data);
- /*
- * The may sleep test only makes sense for sync users.
- * Async users don't need to sleep here anyway.
- */
- crypto_yield(walk->flags);
- }
- if (err)
- return err;
- if (nbytes) {
- 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 & CRYPTO_TFM_REQ_MASK;
- return hash_walk_new_entry(walk);
- }
- EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
- int crypto_ahash_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 & CRYPTO_TFM_REQ_MASK;
- walk->flags |= CRYPTO_ALG_ASYNC;
- BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
- return hash_walk_new_entry(walk);
- }
- EXPORT_SYMBOL_GPL(crypto_ahash_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);
- kzfree(buffer);
- return ret;
- }
- 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 (err)
- return err;
- crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
- return 0;
- }
- EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
- static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
- unsigned int keylen)
- {
- return -ENOSYS;
- }
- static inline unsigned int ahash_align_buffer_size(unsigned len,
- unsigned long mask)
- {
- return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
- }
- static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
- {
- 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_priv *priv;
- priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
- (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
- GFP_KERNEL : GFP_ATOMIC);
- if (!priv)
- return -ENOMEM;
- /*
- * WARNING: Voodoo programming below!
- *
- * The code below is obscure and hard to understand, thus explanation
- * is necessary. See include/crypto/hash.h and include/linux/crypto.h
- * to understand the layout of structures used here!
- *
- * The code here will replace portions of the ORIGINAL request with
- * pointers to new code and buffers so the hashing operation can store
- * the result in aligned buffer. We will call the modified request
- * an ADJUSTED request.
- *
- * The newly mangled request will look as such:
- *
- * req {
- * .result = ADJUSTED[new aligned buffer]
- * .base.complete = ADJUSTED[pointer to completion function]
- * .base.data = ADJUSTED[*req (pointer to self)]
- * .priv = ADJUSTED[new priv] {
- * .result = ORIGINAL(result)
- * .complete = ORIGINAL(base.complete)
- * .data = ORIGINAL(base.data)
- * }
- */
- priv->result = req->result;
- priv->complete = req->base.complete;
- priv->data = req->base.data;
- priv->flags = req->base.flags;
- /*
- * WARNING: We do not backup req->priv here! The req->priv
- * is for internal use of the Crypto API and the
- * user must _NOT_ _EVER_ depend on it's content!
- */
- req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
- req->base.complete = cplt;
- req->base.data = req;
- req->priv = priv;
- return 0;
- }
- static void ahash_restore_req(struct ahash_request *req, int err)
- {
- struct ahash_request_priv *priv = req->priv;
- if (!err)
- memcpy(priv->result, req->result,
- crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
- /* Restore the original crypto request. */
- req->result = priv->result;
- ahash_request_set_callback(req, priv->flags,
- priv->complete, priv->data);
- req->priv = NULL;
- /* Free the req->priv.priv from the ADJUSTED request. */
- kzfree(priv);
- }
- static void ahash_notify_einprogress(struct ahash_request *req)
- {
- struct ahash_request_priv *priv = req->priv;
- struct crypto_async_request oreq;
- oreq.data = priv->data;
- priv->complete(&oreq, -EINPROGRESS);
- }
- static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
- {
- struct ahash_request *areq = req->data;
- if (err == -EINPROGRESS) {
- ahash_notify_einprogress(areq);
- return;
- }
- /*
- * Restore the original request, see ahash_op_unaligned() for what
- * goes where.
- *
- * The "struct ahash_request *req" here is in fact the "req.base"
- * from the ADJUSTED request from ahash_op_unaligned(), thus as it
- * is a pointer to self, it is also the ADJUSTED "req" .
- */
- /* First copy req->result into req->priv.result */
- ahash_restore_req(areq, err);
- /* Complete the ORIGINAL request. */
- areq->base.complete(&areq->base, err);
- }
- static int ahash_op_unaligned(struct ahash_request *req,
- int (*op)(struct ahash_request *))
- {
- int err;
- err = ahash_save_req(req, ahash_op_unaligned_done);
- if (err)
- return err;
- err = op(req);
- if (err == -EINPROGRESS ||
- (err == -EBUSY && (ahash_request_flags(req) &
- CRYPTO_TFM_REQ_MAY_BACKLOG)))
- return err;
- ahash_restore_req(req, err);
- return err;
- }
- static int crypto_ahash_op(struct ahash_request *req,
- int (*op)(struct ahash_request *))
- {
- struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
- unsigned long alignmask = crypto_ahash_alignmask(tfm);
- if ((unsigned long)req->result & alignmask)
- return ahash_op_unaligned(req, op);
- return op(req);
- }
- int crypto_ahash_final(struct ahash_request *req)
- {
- return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
- }
- EXPORT_SYMBOL_GPL(crypto_ahash_final);
- int crypto_ahash_finup(struct ahash_request *req)
- {
- return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
- }
- EXPORT_SYMBOL_GPL(crypto_ahash_finup);
- int crypto_ahash_digest(struct ahash_request *req)
- {
- struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
- if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
- return -ENOKEY;
- return crypto_ahash_op(req, tfm->digest);
- }
- EXPORT_SYMBOL_GPL(crypto_ahash_digest);
- static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
- {
- struct ahash_request *areq = req->data;
- if (err == -EINPROGRESS)
- return;
- ahash_restore_req(areq, err);
- areq->base.complete(&areq->base, err);
- }
- static int ahash_def_finup_finish1(struct ahash_request *req, int err)
- {
- if (err)
- goto out;
- req->base.complete = ahash_def_finup_done2;
- err = crypto_ahash_reqtfm(req)->final(req);
- if (err == -EINPROGRESS ||
- (err == -EBUSY && (ahash_request_flags(req) &
- CRYPTO_TFM_REQ_MAY_BACKLOG)))
- return err;
- out:
- ahash_restore_req(req, err);
- return err;
- }
- static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
- {
- struct ahash_request *areq = req->data;
- if (err == -EINPROGRESS) {
- ahash_notify_einprogress(areq);
- return;
- }
- areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
- err = ahash_def_finup_finish1(areq, err);
- if (areq->priv)
- return;
- areq->base.complete(&areq->base, 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);
- if (err)
- return err;
- err = tfm->update(req);
- if (err == -EINPROGRESS ||
- (err == -EBUSY && (ahash_request_flags(req) &
- CRYPTO_TFM_REQ_MAY_BACKLOG)))
- return err;
- return ahash_def_finup_finish1(req, err);
- }
- static int ahash_no_export(struct ahash_request *req, void *out)
- {
- return -ENOSYS;
- }
- static int ahash_no_import(struct ahash_request *req, const void *in)
- {
- return -ENOSYS;
- }
- 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;
- hash->export = ahash_no_export;
- hash->import = ahash_no_import;
- 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;
- if (alg->setkey) {
- hash->setkey = alg->setkey;
- if (!(alg->halg.base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
- crypto_ahash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
- }
- if (alg->export)
- hash->export = alg->export;
- if (alg->import)
- hash->import = alg->import;
- return 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);
- }
- #ifdef CONFIG_NET
- static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
- {
- struct crypto_report_hash rhash;
- strncpy(rhash.type, "ahash", sizeof(rhash.type));
- rhash.blocksize = alg->cra_blocksize;
- rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
- if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
- sizeof(struct crypto_report_hash), &rhash))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -EMSGSIZE;
- }
- #else
- static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
- {
- return -ENOSYS;
- }
- #endif
- static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
- __attribute__ ((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);
- }
- const struct crypto_type crypto_ahash_type = {
- .extsize = crypto_ahash_extsize,
- .init_tfm = crypto_ahash_init_tfm,
- #ifdef CONFIG_PROC_FS
- .show = crypto_ahash_show,
- #endif
- .report = crypto_ahash_report,
- .maskclear = ~CRYPTO_ALG_TYPE_MASK,
- .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
- .type = CRYPTO_ALG_TYPE_AHASH,
- .tfmsize = offsetof(struct crypto_ahash, base),
- };
- EXPORT_SYMBOL_GPL(crypto_ahash_type);
- 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);
- static int ahash_prepare_alg(struct ahash_alg *alg)
- {
- struct crypto_alg *base = &alg->halg.base;
- if (alg->halg.digestsize > PAGE_SIZE / 8 ||
- alg->halg.statesize > PAGE_SIZE / 8 ||
- alg->halg.statesize == 0)
- return -EINVAL;
- base->cra_type = &crypto_ahash_type;
- base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
- 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);
- int crypto_unregister_ahash(struct ahash_alg *alg)
- {
- return crypto_unregister_alg(&alg->halg.base);
- }
- EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
- int ahash_register_instance(struct crypto_template *tmpl,
- struct ahash_instance *inst)
- {
- int err;
- 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);
- void ahash_free_instance(struct crypto_instance *inst)
- {
- crypto_drop_spawn(crypto_instance_ctx(inst));
- kfree(ahash_instance(inst));
- }
- EXPORT_SYMBOL_GPL(ahash_free_instance);
- int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
- struct hash_alg_common *alg,
- struct crypto_instance *inst)
- {
- return crypto_init_spawn2(&spawn->base, &alg->base, inst,
- &crypto_ahash_type);
- }
- EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
- struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
- {
- struct crypto_alg *alg;
- alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
- return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
- }
- EXPORT_SYMBOL_GPL(ahash_attr_alg);
- 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");
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