485 lines
12 KiB
C
485 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Synchronous Cryptographic Hash operations.
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*
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* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <crypto/scatterwalk.h>
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#include <linux/cryptouser.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/string.h>
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#include <net/netlink.h>
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#include "hash.h"
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static inline struct crypto_istat_hash *shash_get_stat(struct shash_alg *alg)
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{
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return hash_get_stat(&alg->halg);
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}
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static inline int crypto_shash_errstat(struct shash_alg *alg, int err)
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{
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if (IS_ENABLED(CONFIG_CRYPTO_STATS) && err)
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atomic64_inc(&shash_get_stat(alg)->err_cnt);
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return err;
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}
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int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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return -ENOSYS;
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}
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EXPORT_SYMBOL_GPL(shash_no_setkey);
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static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
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{
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if (crypto_shash_alg_needs_key(alg))
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crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
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}
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int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct shash_alg *shash = crypto_shash_alg(tfm);
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int err;
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err = shash->setkey(tfm, key, keylen);
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if (unlikely(err)) {
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shash_set_needkey(tfm, shash);
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return err;
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}
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crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_shash_setkey);
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int crypto_shash_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct shash_alg *shash = crypto_shash_alg(desc->tfm);
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int err;
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if (IS_ENABLED(CONFIG_CRYPTO_STATS))
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atomic64_add(len, &shash_get_stat(shash)->hash_tlen);
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err = shash->update(desc, data, len);
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return crypto_shash_errstat(shash, err);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_update);
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int crypto_shash_final(struct shash_desc *desc, u8 *out)
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{
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struct shash_alg *shash = crypto_shash_alg(desc->tfm);
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int err;
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if (IS_ENABLED(CONFIG_CRYPTO_STATS))
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atomic64_inc(&shash_get_stat(shash)->hash_cnt);
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err = shash->final(desc, out);
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return crypto_shash_errstat(shash, err);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_final);
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static int shash_default_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct shash_alg *shash = crypto_shash_alg(desc->tfm);
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return shash->update(desc, data, len) ?:
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shash->final(desc, out);
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}
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int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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int err;
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if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
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struct crypto_istat_hash *istat = shash_get_stat(shash);
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atomic64_inc(&istat->hash_cnt);
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atomic64_add(len, &istat->hash_tlen);
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}
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err = shash->finup(desc, data, len, out);
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return crypto_shash_errstat(shash, err);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_finup);
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static int shash_default_digest(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct shash_alg *shash = crypto_shash_alg(desc->tfm);
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return shash->init(desc) ?:
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shash->finup(desc, data, len, out);
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}
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int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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int err;
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if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
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struct crypto_istat_hash *istat = shash_get_stat(shash);
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atomic64_inc(&istat->hash_cnt);
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atomic64_add(len, &istat->hash_tlen);
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}
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if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
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err = -ENOKEY;
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else
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err = shash->digest(desc, data, len, out);
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return crypto_shash_errstat(shash, err);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_digest);
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int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
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unsigned int len, u8 *out)
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{
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SHASH_DESC_ON_STACK(desc, tfm);
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int err;
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desc->tfm = tfm;
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err = crypto_shash_digest(desc, data, len, out);
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shash_desc_zero(desc);
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return err;
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}
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EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
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int crypto_shash_export(struct shash_desc *desc, void *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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if (shash->export)
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return shash->export(desc, out);
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memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(tfm));
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_shash_export);
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int crypto_shash_import(struct shash_desc *desc, const void *in)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
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return -ENOKEY;
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if (shash->import)
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return shash->import(desc, in);
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memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_shash_import);
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static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_shash *hash = __crypto_shash_cast(tfm);
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struct shash_alg *alg = crypto_shash_alg(hash);
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alg->exit_tfm(hash);
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}
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static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_shash *hash = __crypto_shash_cast(tfm);
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struct shash_alg *alg = crypto_shash_alg(hash);
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int err;
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hash->descsize = alg->descsize;
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shash_set_needkey(hash, alg);
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if (alg->exit_tfm)
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tfm->exit = crypto_shash_exit_tfm;
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if (!alg->init_tfm)
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return 0;
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err = alg->init_tfm(hash);
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if (err)
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return err;
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/* ->init_tfm() may have increased the descsize. */
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if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
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if (alg->exit_tfm)
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alg->exit_tfm(hash);
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return -EINVAL;
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}
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return 0;
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}
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static void crypto_shash_free_instance(struct crypto_instance *inst)
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{
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struct shash_instance *shash = shash_instance(inst);
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shash->free(shash);
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}
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static int __maybe_unused crypto_shash_report(
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struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_report_hash rhash;
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struct shash_alg *salg = __crypto_shash_alg(alg);
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memset(&rhash, 0, sizeof(rhash));
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strscpy(rhash.type, "shash", sizeof(rhash.type));
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rhash.blocksize = alg->cra_blocksize;
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rhash.digestsize = salg->digestsize;
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return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
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}
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static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
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__maybe_unused;
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static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
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{
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struct shash_alg *salg = __crypto_shash_alg(alg);
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seq_printf(m, "type : shash\n");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "digestsize : %u\n", salg->digestsize);
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}
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static int __maybe_unused crypto_shash_report_stat(
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struct sk_buff *skb, struct crypto_alg *alg)
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{
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return crypto_hash_report_stat(skb, alg, "shash");
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}
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const struct crypto_type crypto_shash_type = {
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.extsize = crypto_alg_extsize,
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.init_tfm = crypto_shash_init_tfm,
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.free = crypto_shash_free_instance,
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#ifdef CONFIG_PROC_FS
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.show = crypto_shash_show,
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#endif
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#if IS_ENABLED(CONFIG_CRYPTO_USER)
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.report = crypto_shash_report,
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#endif
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#ifdef CONFIG_CRYPTO_STATS
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.report_stat = crypto_shash_report_stat,
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#endif
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.maskclear = ~CRYPTO_ALG_TYPE_MASK,
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.maskset = CRYPTO_ALG_TYPE_MASK,
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.type = CRYPTO_ALG_TYPE_SHASH,
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.tfmsize = offsetof(struct crypto_shash, base),
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};
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int crypto_grab_shash(struct crypto_shash_spawn *spawn,
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struct crypto_instance *inst,
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const char *name, u32 type, u32 mask)
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{
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spawn->base.frontend = &crypto_shash_type;
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return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_grab_shash);
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struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
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u32 mask)
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{
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return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_alloc_shash);
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int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
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{
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return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_has_shash);
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struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash)
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{
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struct crypto_tfm *tfm = crypto_shash_tfm(hash);
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struct shash_alg *alg = crypto_shash_alg(hash);
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struct crypto_shash *nhash;
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int err;
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if (!crypto_shash_alg_has_setkey(alg)) {
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tfm = crypto_tfm_get(tfm);
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if (IS_ERR(tfm))
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return ERR_CAST(tfm);
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return hash;
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}
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if (!alg->clone_tfm && (alg->init_tfm || alg->base.cra_init))
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return ERR_PTR(-ENOSYS);
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nhash = crypto_clone_tfm(&crypto_shash_type, tfm);
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if (IS_ERR(nhash))
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return nhash;
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nhash->descsize = hash->descsize;
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if (alg->clone_tfm) {
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err = alg->clone_tfm(nhash, hash);
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if (err) {
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crypto_free_shash(nhash);
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return ERR_PTR(err);
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}
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}
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return nhash;
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}
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EXPORT_SYMBOL_GPL(crypto_clone_shash);
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int hash_prepare_alg(struct hash_alg_common *alg)
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{
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struct crypto_istat_hash *istat = hash_get_stat(alg);
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struct crypto_alg *base = &alg->base;
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if (alg->digestsize > HASH_MAX_DIGESTSIZE)
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return -EINVAL;
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/* alignmask is not useful for hashes, so it is not supported. */
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if (base->cra_alignmask)
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return -EINVAL;
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base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
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if (IS_ENABLED(CONFIG_CRYPTO_STATS))
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memset(istat, 0, sizeof(*istat));
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return 0;
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}
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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");
|