From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vitaly Chikunov Date: Fri, 01 Mar 2019 17:59:09 +0000 Subject: [PATCH v7 02/11] crypto: akcipher - check the presence of callback before the call Message-Id: <20190301175918.29694-3-vt@altlinux.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit List-Id: References: <20190301175918.29694-1-vt@altlinux.org> In-Reply-To: <20190301175918.29694-1-vt@altlinux.org> To: Herbert Xu , David Howells , Mimi Zohar , Dmitry Kasatkin , linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Because with introduction of EC-RDSA and change in workings of RSA in regard to sign/verify, akcipher could have not all callbacks defined, check the presence of callbacks before calling them to increase robustness. Signed-off-by: Vitaly Chikunov --- include/crypto/akcipher.h | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) diff --git a/include/crypto/akcipher.h b/include/crypto/akcipher.h index 2d690494568c..f537fad1989f 100644 --- a/include/crypto/akcipher.h +++ b/include/crypto/akcipher.h @@ -268,7 +268,10 @@ static inline unsigned int crypto_akcipher_maxsize(struct crypto_akcipher *tfm) { struct akcipher_alg *alg = crypto_akcipher_alg(tfm); - return alg->max_size(tfm); + if (alg->max_size) + return alg->max_size(tfm); + else + return 0; } /** @@ -287,10 +290,11 @@ static inline int crypto_akcipher_encrypt(struct akcipher_request *req) struct akcipher_alg *alg = crypto_akcipher_alg(tfm); struct crypto_alg *calg = tfm->base.__crt_alg; unsigned int src_len = req->src_len; - int ret; + int ret = -ENOSYS; crypto_stats_get(calg); - ret = alg->encrypt(req); + if (alg->encrypt) + ret = alg->encrypt(req); crypto_stats_akcipher_encrypt(src_len, ret, calg); return ret; } @@ -311,10 +315,11 @@ static inline int crypto_akcipher_decrypt(struct akcipher_request *req) struct akcipher_alg *alg = crypto_akcipher_alg(tfm); struct crypto_alg *calg = tfm->base.__crt_alg; unsigned int src_len = req->src_len; - int ret; + int ret = -ENOSYS; crypto_stats_get(calg); - ret = alg->decrypt(req); + if (alg->decrypt) + ret = alg->decrypt(req); crypto_stats_akcipher_decrypt(src_len, ret, calg); return ret; } @@ -334,10 +339,11 @@ static inline int crypto_akcipher_sign(struct akcipher_request *req) struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); struct akcipher_alg *alg = crypto_akcipher_alg(tfm); struct crypto_alg *calg = tfm->base.__crt_alg; - int ret; + int ret = -ENOSYS; crypto_stats_get(calg); - ret = alg->sign(req); + if (alg->sign) + ret = alg->sign(req); crypto_stats_akcipher_sign(ret, calg); return ret; } @@ -357,10 +363,11 @@ static inline int crypto_akcipher_verify(struct akcipher_request *req) struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); struct akcipher_alg *alg = crypto_akcipher_alg(tfm); struct crypto_alg *calg = tfm->base.__crt_alg; - int ret; + int ret = -ENOSYS; crypto_stats_get(calg); - ret = alg->verify(req); + if (alg->verify) + ret = alg->verify(req); crypto_stats_akcipher_verify(ret, calg); return ret; } -- 2.11.0