| // 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); |
| 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 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); |
| |
| 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 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); |
| |
| 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, |
| #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 > 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); |
| |
| 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"); |