From: Huang Ying Subject: [RFC 5/7] crypto: cryptd: Add support to access underlaying shash Date: Thu, 11 Jun 2009 15:10:34 +0800 Message-ID: <1244704234.5320.128.camel@yhuang-dev.sh.intel.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org To: Herbert Xu Return-path: Received: from mga01.intel.com ([192.55.52.88]:26953 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759076AbZFKHKf (ORCPT ); Thu, 11 Jun 2009 03:10:35 -0400 Sender: linux-crypto-owner@vger.kernel.org List-ID: cryptd_alloc_ahash() will allocate a cryptd-ed ahash for specified algorithm name. The new allocated one is guaranteed to be cryptd-ed ahash, so the shash underlying can be gotten via cryptd_ahash_child(). Signed-off-by: Huang Ying --- crypto/cryptd.c | 35 +++++++++++++++++++++++++++++++++++ include/crypto/cryptd.h | 17 +++++++++++++++++ 2 files changed, 52 insertions(+) --- a/crypto/cryptd.c +++ b/crypto/cryptd.c @@ -648,6 +648,41 @@ void cryptd_free_ablkcipher(struct crypt } EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher); +struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name, + u32 type, u32 mask) +{ + char cryptd_alg_name[CRYPTO_MAX_ALG_NAME]; + struct crypto_ahash *tfm; + + if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME, + "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME) + return ERR_PTR(-EINVAL); + tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask); + if (IS_ERR(tfm)) + return ERR_CAST(tfm); + if (tfm->base.__crt_alg->cra_module != THIS_MODULE) { + crypto_free_ahash(tfm); + return ERR_PTR(-EINVAL); + } + + return __cryptd_ahash_cast(tfm); +} +EXPORT_SYMBOL_GPL(cryptd_alloc_ahash); + +struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm) +{ + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base); + + return ctx->child; +} +EXPORT_SYMBOL_GPL(cryptd_ahash_child); + +void cryptd_free_ahash(struct cryptd_ahash *tfm) +{ + crypto_free_ahash(&tfm->base); +} +EXPORT_SYMBOL_GPL(cryptd_free_ahash); + static int __init cryptd_init(void) { int err; --- a/include/crypto/cryptd.h +++ b/include/crypto/cryptd.h @@ -7,6 +7,7 @@ #include #include +#include struct cryptd_ablkcipher { struct crypto_ablkcipher base; @@ -24,4 +25,20 @@ struct cryptd_ablkcipher *cryptd_alloc_a struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm); void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm); +struct cryptd_ahash { + struct crypto_ahash base; +}; + +static inline struct cryptd_ahash *__cryptd_ahash_cast( + struct crypto_ahash *tfm) +{ + return (struct cryptd_ahash *)tfm; +} + +/* alg_name should be algorithm to be cryptd-ed */ +struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name, + u32 type, u32 mask); +struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm); +void cryptd_free_ahash(struct cryptd_ahash *tfm); + #endif