diff options
Diffstat (limited to 'crypto/shash.c')
| -rw-r--r-- | crypto/shash.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/crypto/shash.c b/crypto/shash.c index 4cefa614dbbd..5845b7d59b2f 100644 --- a/crypto/shash.c +++ b/crypto/shash.c @@ -445,6 +445,24 @@ int crypto_init_shash_ops_async(struct crypto_tfm *tfm) return 0; } +struct crypto_ahash *crypto_clone_shash_ops_async(struct crypto_ahash *nhash, + struct crypto_ahash *hash) +{ + struct crypto_shash **nctx = crypto_ahash_ctx(nhash); + struct crypto_shash **ctx = crypto_ahash_ctx(hash); + struct crypto_shash *shash; + + shash = crypto_clone_shash(*ctx); + if (IS_ERR(shash)) { + crypto_free_ahash(nhash); + return ERR_CAST(shash); + } + + *nctx = shash; + + return nhash; +} + static void crypto_shash_exit_tfm(struct crypto_tfm *tfm) { struct crypto_shash *hash = __crypto_shash_cast(tfm); @@ -564,6 +582,40 @@ int crypto_has_shash(const char *alg_name, u32 type, u32 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) + return ERR_PTR(-ENOSYS); + + nhash = crypto_clone_tfm(&crypto_shash_type, tfm); + if (IS_ERR(nhash)) + return nhash; + + nhash->descsize = hash->descsize; + + 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_istat_hash *istat = hash_get_stat(alg); |