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-rw-r--r--crypto/shash.c633
1 files changed, 633 insertions, 0 deletions
diff --git a/crypto/shash.c b/crypto/shash.c
new file mode 100644
index 000000000..4c88e63b3
--- /dev/null
+++ b/crypto/shash.c
@@ -0,0 +1,633 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Synchronous Cryptographic Hash operations.
+ *
+ * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#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);
+ kfree_sensitive(buffer);
+ return err;
+}
+
+static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
+{
+ if (crypto_shash_alg_needs_key(alg))
+ 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 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);
+ /*
+ * We cannot count on __aligned() working for large values:
+ * https://patchwork.kernel.org/patch/9507697/
+ */
+ u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
+ u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
+ int err;
+
+ if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
+ return -EINVAL;
+
+ 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);
+ /*
+ * We cannot count on __aligned() working for large values:
+ * https://patchwork.kernel.org/patch/9507697/
+ */
+ u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
+ u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
+ int err;
+
+ if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
+ return -EINVAL;
+
+ 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);
+
+int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
+ unsigned int len, u8 *out)
+{
+ SHASH_DESC_ON_STACK(desc, tfm);
+ int err;
+
+ desc->tfm = tfm;
+
+ err = crypto_shash_digest(desc, data, len, out);
+
+ shash_desc_zero(desc);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(crypto_shash_tfm_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;
+
+ 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;
+
+ 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);
+ } 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;
+
+ 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;
+
+ 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);
+
+ crt->export = shash_async_export;
+ crt->import = shash_async_import;
+
+ crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
+
+ return 0;
+}
+
+static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
+{
+ struct crypto_shash *hash = __crypto_shash_cast(tfm);
+ struct shash_alg *alg = crypto_shash_alg(hash);
+
+ alg->exit_tfm(hash);
+}
+
+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);
+ int err;
+
+ hash->descsize = alg->descsize;
+
+ shash_set_needkey(hash, alg);
+
+ if (alg->exit_tfm)
+ tfm->exit = crypto_shash_exit_tfm;
+
+ if (!alg->init_tfm)
+ return 0;
+
+ err = alg->init_tfm(hash);
+ if (err)
+ return err;
+
+ /* ->init_tfm() may have increased the descsize. */
+ if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
+ if (alg->exit_tfm)
+ alg->exit_tfm(hash);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void crypto_shash_free_instance(struct crypto_instance *inst)
+{
+ struct shash_instance *shash = shash_instance(inst);
+
+ shash->free(shash);
+}
+
+#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);
+
+ memset(&rhash, 0, sizeof(rhash));
+
+ strscpy(rhash.type, "shash", sizeof(rhash.type));
+
+ rhash.blocksize = alg->cra_blocksize;
+ rhash.digestsize = salg->digestsize;
+
+ return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
+}
+#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,
+ .free = crypto_shash_free_instance,
+#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),
+};
+
+int crypto_grab_shash(struct crypto_shash_spawn *spawn,
+ struct crypto_instance *inst,
+ const char *name, u32 type, u32 mask)
+{
+ spawn->base.frontend = &crypto_shash_type;
+ return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_grab_shash);
+
+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);
+
+int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
+{
+ return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_has_shash);
+
+static int shash_prepare_alg(struct shash_alg *alg)
+{
+ struct crypto_alg *base = &alg->base;
+
+ if (alg->digestsize > HASH_MAX_DIGESTSIZE ||
+ alg->descsize > HASH_MAX_DESCSIZE ||
+ alg->statesize > HASH_MAX_STATESIZE)
+ return -EINVAL;
+
+ if ((alg->export && !alg->import) || (alg->import && !alg->export))
+ 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);
+
+void crypto_unregister_shash(struct shash_alg *alg)
+{
+ 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);
+
+void crypto_unregister_shashes(struct shash_alg *algs, int count)
+{
+ int i;
+
+ for (i = count - 1; i >= 0; --i)
+ crypto_unregister_shash(&algs[i]);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
+
+int shash_register_instance(struct crypto_template *tmpl,
+ struct shash_instance *inst)
+{
+ int err;
+
+ if (WARN_ON(!inst->free))
+ return -EINVAL;
+
+ 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_singlespawn_instance(struct shash_instance *inst)
+{
+ crypto_drop_spawn(shash_instance_ctx(inst));
+ kfree(inst);
+}
+EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Synchronous cryptographic hash type");