| Message ID | 20190301175918.29694-3-vt@altlinux.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | crypto: add EC-RDSA (GOST 34.10) algorithm | expand |
On Fri, Mar 01, 2019 at 08:59:09PM +0300, Vitaly Chikunov wrote: > 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 <vt@altlinux.org> > --- > 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; > } Please do these checks at registration time instead and provide default implementations as needed. Thanks,
Herbert, On Thu, Mar 21, 2019 at 07:19:18PM +0800, Herbert Xu wrote: > On Fri, Mar 01, 2019 at 08:59:09PM +0300, Vitaly Chikunov wrote: > > 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 <vt@altlinux.org> > > --- > > 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; > > } > > Please do these checks at registration time instead and provide > default implementations as needed. I guess patch "PATCH v7 01/11] KEYS: report to keyctl only actually supported key ops" should also be removed and will infer anything from presence of the callbacks. Thanks, > > Thanks, > -- > Email: Herbert Xu <herbert@gondor.apana.org.au> > Home Page: http://gondor.apana.org.au/~herbert/ > PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
On Thu, Mar 21, 2019 at 02:42:10PM +0300, Vitaly Chikunov wrote: > > I guess patch "PATCH v7 01/11] KEYS: report to keyctl only actually > supported key ops" should also be removed and will infer anything from > presence of the callbacks. Indeed. Especially if this is exposed to user-space then you need to be careful changing the user-space API by clearing the verify/sign bits for raw RSA. Cheers,
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; }
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 <vt@altlinux.org> --- include/crypto/akcipher.h | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-)