// 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 <linux/cryptouser.h> #include <linux/err.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/seq_file.h> #include <linux/string.h> #include <net/netlink.h> #include "hash.h" int shash_no_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { return -ENOSYS; } EXPORT_SYMBOL_GPL(shash_no_setkey); 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); int err; 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); int crypto_shash_update(struct shash_desc *desc, const u8 *data, unsigned int len) { return crypto_shash_alg(desc->tfm)->update(desc, data, len); } EXPORT_SYMBOL_GPL(crypto_shash_update); int crypto_shash_final(struct shash_desc *desc, u8 *out) { return crypto_shash_alg(desc->tfm)->final(desc, out); } EXPORT_SYMBOL_GPL(crypto_shash_final); static int shash_default_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { struct shash_alg *shash = crypto_shash_alg(desc->tfm); return shash->update(desc, data, len) ?: shash->final(desc, out); } int crypto_shash_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { return crypto_shash_alg(desc->tfm)->finup(desc, data, len, out); } EXPORT_SYMBOL_GPL(crypto_shash_finup); static int shash_default_digest(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { struct shash_alg *shash = crypto_shash_alg(desc->tfm); return shash->init(desc) ?: 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; if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) return -ENOKEY; return crypto_shash_alg(tfm)->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); int crypto_shash_export(struct shash_desc *desc, void *out) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); if (shash->export) return shash->export(desc, out); memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(tfm)); return 0; } EXPORT_SYMBOL_GPL(crypto_shash_export); int crypto_shash_import(struct shash_desc *desc, const void *in) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) return -ENOKEY; if (shash->import) return shash->import(desc, in); memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm)); return 0; } EXPORT_SYMBOL_GPL(crypto_shash_import); 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); } static int __maybe_unused 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); } 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); } 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 #if IS_ENABLED(CONFIG_CRYPTO_USER) .report = crypto_shash_report, #endif .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); struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash) { struct crypto_tfm *tfm = crypto_shash_tfm(hash); struct shash_alg *alg = crypto_shash_alg(hash); struct crypto_shash *nhash; int err; if (!crypto_shash_alg_has_setkey(alg)) { tfm = crypto_tfm_get(tfm); if (IS_ERR(tfm)) return ERR_CAST(tfm); return hash; } if (!alg->clone_tfm && (alg->init_tfm || alg->base.cra_init)) return ERR_PTR(-ENOSYS); nhash = crypto_clone_tfm(&crypto_shash_type, tfm); if (IS_ERR(nhash)) return nhash; nhash->descsize = hash->descsize; if (alg->clone_tfm) { err = alg->clone_tfm(nhash, hash); if (err) { crypto_free_shash(nhash); return ERR_PTR(err); } } return nhash; } EXPORT_SYMBOL_GPL(crypto_clone_shash); int hash_prepare_alg(struct hash_alg_common *alg) { struct crypto_alg *base = &alg->base; if (alg->digestsize > HASH_MAX_DIGESTSIZE) return -EINVAL; /* alignmask is not useful for hashes, so it is not supported. */ if (base->cra_alignmask) return -EINVAL; base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; return 0; } static int shash_prepare_alg(struct shash_alg *alg) { struct crypto_alg *base = &alg->halg.base; int err; if (alg->descsize > HASH_MAX_DESCSIZE) return -EINVAL; if ((alg->export && !alg->import) || (alg->import && !alg->export)) return -EINVAL; err = hash_prepare_alg(&alg->halg); if (err) return err; base->cra_type = &crypto_shash_type; base->cra_flags |= CRYPTO_ALG_TYPE_SHASH; /* * Handle missing optional functions. For each one we can either * install a default here, or we can leave the pointer as NULL and check * the pointer for NULL in crypto_shash_*(), avoiding an indirect call * when the default behavior is desired. For ->finup and ->digest we * install defaults, since for optimal performance algorithms should * implement these anyway. On the other hand, for ->import and * ->export the common case and best performance comes from the simple * memcpy of the shash_desc_ctx, so when those pointers are NULL we * leave them NULL and provide the memcpy with no indirect call. */ if (!alg->finup) alg->finup = shash_default_finup; if (!alg->digest) alg->digest = shash_default_digest; if (!alg->export) alg->halg.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");