1 files changed, 600 insertions, 0 deletions

diff --git a/crypto/shash.c b/crypto/shash.c
new file mode 100644
index 000000000..55e7a2f63
--- /dev/null
+++ b/crypto/shash.c
@@ -0,0 +1,600 @@
+/*
+ * Synchronous Cryptographic Hash operations.
+ *
+ * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * 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/scatterwalk.h>
+#include <crypto/internal/hash.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/cryptouser.h>
+#include <net/netlink.h>
+#include <linux/compiler.h>
+
+#include "internal.h"
+
+static const struct crypto_type crypto_shash_type;
+
+static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
+			   unsigned int keylen)
+{
+	return -ENOSYS;
+}
+
+/*
+ * Check whether an shash algorithm has a setkey function.
+ *
+ * For CFI compatibility, this must not be an inline function.  This is because
+ * when CFI is enabled, modules won't get the same address for shash_no_setkey
+ * (if it were exported, which inlining would require) as the core kernel will.
+ */
+bool crypto_shash_alg_has_setkey(struct shash_alg *alg)
+{
+	return alg->setkey != shash_no_setkey;
+}
+EXPORT_SYMBOL_GPL(crypto_shash_alg_has_setkey);
+
+static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
+				  unsigned int keylen)
+{
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+	unsigned long absize;
+	u8 *buffer, *alignbuffer;
+	int err;
+
+	absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
+	buffer = kmalloc(absize, GFP_ATOMIC);
+	if (!buffer)
+		return -ENOMEM;
+
+	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
+	memcpy(alignbuffer, key, keylen);
+	err = shash->setkey(tfm, alignbuffer, keylen);
+	kzfree(buffer);
+	return err;
+}
+
+static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
+{
+	if (crypto_shash_alg_has_setkey(alg) &&
+	    !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
+		crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
+}
+
+int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
+			unsigned int keylen)
+{
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+	int err;
+
+	if ((unsigned long)key & alignmask)
+		err = shash_setkey_unaligned(tfm, key, keylen);
+	else
+		err = shash->setkey(tfm, key, keylen);
+
+	if (unlikely(err)) {
+		shash_set_needkey(tfm, shash);
+		return err;
+	}
+
+	crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_shash_setkey);
+
+static inline unsigned int shash_align_buffer_size(unsigned len,
+						   unsigned long mask)
+{
+	typedef u8 __aligned_largest u8_aligned;
+	return len + (mask & ~(__alignof__(u8_aligned) - 1));
+}
+
+static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
+				  unsigned int len)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+	unsigned int unaligned_len = alignmask + 1 -
+				     ((unsigned long)data & alignmask);
+	u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
+		__aligned_largest;
+	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
+	int err;
+
+	if (unaligned_len > len)
+		unaligned_len = len;
+
+	memcpy(buf, data, unaligned_len);
+	err = shash->update(desc, buf, unaligned_len);
+	memset(buf, 0, unaligned_len);
+
+	return err ?:
+	       shash->update(desc, data + unaligned_len, len - unaligned_len);
+}
+
+int crypto_shash_update(struct shash_desc *desc, const u8 *data,
+			unsigned int len)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+
+	if ((unsigned long)data & alignmask)
+		return shash_update_unaligned(desc, data, len);
+
+	return shash->update(desc, data, len);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_update);
+
+static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned int ds = crypto_shash_digestsize(tfm);
+	u8 ubuf[shash_align_buffer_size(ds, alignmask)]
+		__aligned_largest;
+	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
+	int err;
+
+	err = shash->final(desc, buf);
+	if (err)
+		goto out;
+
+	memcpy(out, buf, ds);
+
+out:
+	memset(buf, 0, ds);
+	return err;
+}
+
+int crypto_shash_final(struct shash_desc *desc, u8 *out)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+
+	if ((unsigned long)out & alignmask)
+		return shash_final_unaligned(desc, out);
+
+	return shash->final(desc, out);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_final);
+
+static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
+				 unsigned int len, u8 *out)
+{
+	return crypto_shash_update(desc, data, len) ?:
+	       crypto_shash_final(desc, out);
+}
+
+int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
+		       unsigned int len, u8 *out)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+
+	if (((unsigned long)data | (unsigned long)out) & alignmask)
+		return shash_finup_unaligned(desc, data, len, out);
+
+	return shash->finup(desc, data, len, out);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_finup);
+
+static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
+				  unsigned int len, u8 *out)
+{
+	return crypto_shash_init(desc) ?:
+	       crypto_shash_finup(desc, data, len, out);
+}
+
+int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
+			unsigned int len, u8 *out)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+
+	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+		return -ENOKEY;
+
+	if (((unsigned long)data | (unsigned long)out) & alignmask)
+		return shash_digest_unaligned(desc, data, len, out);
+
+	return shash->digest(desc, data, len, out);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_digest);
+
+static int shash_default_export(struct shash_desc *desc, void *out)
+{
+	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
+	return 0;
+}
+
+static int shash_default_import(struct shash_desc *desc, const void *in)
+{
+	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
+	return 0;
+}
+
+static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
+			      unsigned int keylen)
+{
+	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
+
+	return crypto_shash_setkey(*ctx, key, keylen);
+}
+
+static int shash_async_init(struct ahash_request *req)
+{
+	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
+	struct shash_desc *desc = ahash_request_ctx(req);
+
+	desc->tfm = *ctx;
+	desc->flags = req->base.flags;
+
+	return crypto_shash_init(desc);
+}
+
+int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
+{
+	struct crypto_hash_walk walk;
+	int nbytes;
+
+	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
+	     nbytes = crypto_hash_walk_done(&walk, nbytes))
+		nbytes = crypto_shash_update(desc, walk.data, nbytes);
+
+	return nbytes;
+}
+EXPORT_SYMBOL_GPL(shash_ahash_update);
+
+static int shash_async_update(struct ahash_request *req)
+{
+	return shash_ahash_update(req, ahash_request_ctx(req));
+}
+
+static int shash_async_final(struct ahash_request *req)
+{
+	return crypto_shash_final(ahash_request_ctx(req), req->result);
+}
+
+int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
+{
+	struct crypto_hash_walk walk;
+	int nbytes;
+
+	nbytes = crypto_hash_walk_first(req, &walk);
+	if (!nbytes)
+		return crypto_shash_final(desc, req->result);
+
+	do {
+		nbytes = crypto_hash_walk_last(&walk) ?
+			 crypto_shash_finup(desc, walk.data, nbytes,
+					    req->result) :
+			 crypto_shash_update(desc, walk.data, nbytes);
+		nbytes = crypto_hash_walk_done(&walk, nbytes);
+	} while (nbytes > 0);
+
+	return nbytes;
+}
+EXPORT_SYMBOL_GPL(shash_ahash_finup);
+
+static int shash_async_finup(struct ahash_request *req)
+{
+	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
+	struct shash_desc *desc = ahash_request_ctx(req);
+
+	desc->tfm = *ctx;
+	desc->flags = req->base.flags;
+
+	return shash_ahash_finup(req, desc);
+}
+
+int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
+{
+	unsigned int nbytes = req->nbytes;
+	struct scatterlist *sg;
+	unsigned int offset;
+	int err;
+
+	if (nbytes &&
+	    (sg = req->src, offset = sg->offset,
+	     nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
+		void *data;
+
+		data = kmap_atomic(sg_page(sg));
+		err = crypto_shash_digest(desc, data + offset, nbytes,
+					  req->result);
+		kunmap_atomic(data);
+		crypto_yield(desc->flags);
+	} else
+		err = crypto_shash_init(desc) ?:
+		      shash_ahash_finup(req, desc);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(shash_ahash_digest);
+
+static int shash_async_digest(struct ahash_request *req)
+{
+	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
+	struct shash_desc *desc = ahash_request_ctx(req);
+
+	desc->tfm = *ctx;
+	desc->flags = req->base.flags;
+
+	return shash_ahash_digest(req, desc);
+}
+
+static int shash_async_export(struct ahash_request *req, void *out)
+{
+	return crypto_shash_export(ahash_request_ctx(req), out);
+}
+
+static int shash_async_import(struct ahash_request *req, const void *in)
+{
+	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
+	struct shash_desc *desc = ahash_request_ctx(req);
+
+	desc->tfm = *ctx;
+	desc->flags = req->base.flags;
+
+	return crypto_shash_import(desc, in);
+}
+
+static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
+{
+	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
+
+	crypto_free_shash(*ctx);
+}
+
+int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
+{
+	struct crypto_alg *calg = tfm->__crt_alg;
+	struct shash_alg *alg = __crypto_shash_alg(calg);
+	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
+	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
+	struct crypto_shash *shash;
+
+	if (!crypto_mod_get(calg))
+		return -EAGAIN;
+
+	shash = crypto_create_tfm(calg, &crypto_shash_type);
+	if (IS_ERR(shash)) {
+		crypto_mod_put(calg);
+		return PTR_ERR(shash);
+	}
+
+	*ctx = shash;
+	tfm->exit = crypto_exit_shash_ops_async;
+
+	crt->init = shash_async_init;
+	crt->update = shash_async_update;
+	crt->final = shash_async_final;
+	crt->finup = shash_async_finup;
+	crt->digest = shash_async_digest;
+	if (crypto_shash_alg_has_setkey(alg))
+		crt->setkey = shash_async_setkey;
+
+	crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
+				    CRYPTO_TFM_NEED_KEY);
+
+	if (alg->export)
+		crt->export = shash_async_export;
+	if (alg->import)
+		crt->import = shash_async_import;
+
+	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
+
+	return 0;
+}
+
+static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
+{
+	struct crypto_shash *hash = __crypto_shash_cast(tfm);
+	struct shash_alg *alg = crypto_shash_alg(hash);
+
+	hash->descsize = alg->descsize;
+
+	shash_set_needkey(hash, alg);
+
+	return 0;
+}
+
+#ifdef CONFIG_NET
+static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+	struct crypto_report_hash rhash;
+	struct shash_alg *salg = __crypto_shash_alg(alg);
+
+	strncpy(rhash.type, "shash", sizeof(rhash.type));
+
+	rhash.blocksize = alg->cra_blocksize;
+	rhash.digestsize = salg->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_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+	return -ENOSYS;
+}
+#endif
+
+static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
+	__maybe_unused;
+static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
+{
+	struct shash_alg *salg = __crypto_shash_alg(alg);
+
+	seq_printf(m, "type         : shash\n");
+	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
+	seq_printf(m, "digestsize   : %u\n", salg->digestsize);
+}
+
+static const struct crypto_type crypto_shash_type = {
+	.extsize = crypto_alg_extsize,
+	.init_tfm = crypto_shash_init_tfm,
+#ifdef CONFIG_PROC_FS
+	.show = crypto_shash_show,
+#endif
+	.report = crypto_shash_report,
+	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
+	.maskset = CRYPTO_ALG_TYPE_MASK,
+	.type = CRYPTO_ALG_TYPE_SHASH,
+	.tfmsize = offsetof(struct crypto_shash, base),
+};
+
+struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
+					u32 mask)
+{
+	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_shash);
+
+static int shash_prepare_alg(struct shash_alg *alg)
+{
+	struct crypto_alg *base = &alg->base;
+
+	if (alg->digestsize > PAGE_SIZE / 8 ||
+	    alg->descsize > PAGE_SIZE / 8 ||
+	    alg->statesize > PAGE_SIZE / 8)
+		return -EINVAL;
+
+	base->cra_type = &crypto_shash_type;
+	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+	base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
+
+	if (!alg->finup)
+		alg->finup = shash_finup_unaligned;
+	if (!alg->digest)
+		alg->digest = shash_digest_unaligned;
+	if (!alg->export) {
+		alg->export = shash_default_export;
+		alg->import = shash_default_import;
+		alg->statesize = alg->descsize;
+	}
+	if (!alg->setkey)
+		alg->setkey = shash_no_setkey;
+
+	return 0;
+}
+
+int crypto_register_shash(struct shash_alg *alg)
+{
+	struct crypto_alg *base = &alg->base;
+	int err;
+
+	err = shash_prepare_alg(alg);
+	if (err)
+		return err;
+
+	return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_shash);
+
+int crypto_unregister_shash(struct shash_alg *alg)
+{
+	return crypto_unregister_alg(&alg->base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_shash);
+
+int crypto_register_shashes(struct shash_alg *algs, int count)
+{
+	int i, ret;
+
+	for (i = 0; i < count; i++) {
+		ret = crypto_register_shash(&algs[i]);
+		if (ret)
+			goto err;
+	}
+
+	return 0;
+
+err:
+	for (--i; i >= 0; --i)
+		crypto_unregister_shash(&algs[i]);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_register_shashes);
+
+int crypto_unregister_shashes(struct shash_alg *algs, int count)
+{
+	int i, ret;
+
+	for (i = count - 1; i >= 0; --i) {
+		ret = crypto_unregister_shash(&algs[i]);
+		if (ret)
+			pr_err("Failed to unregister %s %s: %d\n",
+			       algs[i].base.cra_driver_name,
+			       algs[i].base.cra_name, ret);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
+
+int shash_register_instance(struct crypto_template *tmpl,
+			    struct shash_instance *inst)
+{
+	int err;
+
+	err = shash_prepare_alg(&inst->alg);
+	if (err)
+		return err;
+
+	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
+}
+EXPORT_SYMBOL_GPL(shash_register_instance);
+
+void shash_free_instance(struct crypto_instance *inst)
+{
+	crypto_drop_spawn(crypto_instance_ctx(inst));
+	kfree(shash_instance(inst));
+}
+EXPORT_SYMBOL_GPL(shash_free_instance);
+
+int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
+			    struct shash_alg *alg,
+			    struct crypto_instance *inst)
+{
+	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
+				  &crypto_shash_type);
+}
+EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
+
+struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
+{
+	struct crypto_alg *alg;
+
+	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
+	return IS_ERR(alg) ? ERR_CAST(alg) :
+	       container_of(alg, struct shash_alg, base);
+}
+EXPORT_SYMBOL_GPL(shash_attr_alg);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Synchronous cryptographic hash type");