From: Herbert Xu Subject: Re: [PATCH] crypto: obscure state information on free Date: Sun, 17 Aug 2008 22:23:50 +1000 Message-ID: <20080817122350.GB26195@gondor.apana.org.au> References: <20080811202607.GA11527@hmsreliant.think-freely.org> <20080814115137.GA5721@gondor.apana.org.au> <20080814122137.GA10969@hmsendeavour.rdu.redhat.com> <20080817122047.GA26084@gondor.apana.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, davem@davemloft.net To: Neil Horman Return-path: Received: from rhun.apana.org.au ([64.62.148.172]:43725 "EHLO arnor.apana.org.au" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752573AbYHQMXx (ORCPT ); Sun, 17 Aug 2008 08:23:53 -0400 Content-Disposition: inline In-Reply-To: <20080817122047.GA26084@gondor.apana.org.au> Sender: linux-crypto-owner@vger.kernel.org List-ID: On Sun, Aug 17, 2008 at 10:20:47PM +1000, Herbert Xu wrote: > > There is also a new global rng object for everyone to use rather > than having it allocated by every user separately. And here is the new IV generator patch to use the global RNG object. commit 1da64c8d0d573dcb1b67c42d41c0adf511f81dfc Author: Herbert Xu Date: Thu Aug 14 22:21:31 2008 +1000 crypto: skcipher - Use RNG interface instead of get_random_bytes This patch makes the IV generators use the new RNG interface so that the user can pick an RNG other than the default get_random_bytes. Signed-off-by: Herbert Xu diff --git a/crypto/Kconfig b/crypto/Kconfig index b00860f..a985065 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -33,6 +33,7 @@ config CRYPTO_AEAD config CRYPTO_BLKCIPHER tristate select CRYPTO_ALGAPI + select CRYPTO_RNG config CRYPTO_HASH tristate @@ -117,6 +118,7 @@ config CRYPTO_SEQIV tristate "Sequence Number IV Generator" select CRYPTO_AEAD select CRYPTO_BLKCIPHER + select CRYPTO_RNG help This IV generator generates an IV based on a sequence number by xoring it with a salt. This algorithm is mainly useful for CTR diff --git a/crypto/chainiv.c b/crypto/chainiv.c index cf68d43..7c37a49 100644 --- a/crypto/chainiv.c +++ b/crypto/chainiv.c @@ -14,11 +14,11 @@ */ #include +#include #include #include #include #include -#include #include #include #include @@ -83,6 +83,7 @@ static int chainiv_givencrypt_first(struct skcipher_givcrypt_request *req) { struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req); struct chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); + int err = 0; spin_lock_bh(&ctx->lock); if (crypto_ablkcipher_crt(geniv)->givencrypt != @@ -90,11 +91,15 @@ static int chainiv_givencrypt_first(struct skcipher_givcrypt_request *req) goto unlock; crypto_ablkcipher_crt(geniv)->givencrypt = chainiv_givencrypt; - get_random_bytes(ctx->iv, crypto_ablkcipher_ivsize(geniv)); + err = crypto_rng_get_bytes(crypto_default_rng, ctx->iv, + crypto_ablkcipher_ivsize(geniv)); unlock: spin_unlock_bh(&ctx->lock); + if (err) + return err; + return chainiv_givencrypt(req); } @@ -203,6 +208,7 @@ static int async_chainiv_givencrypt_first(struct skcipher_givcrypt_request *req) { struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req); struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); + int err = 0; if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state)) goto out; @@ -212,11 +218,15 @@ static int async_chainiv_givencrypt_first(struct skcipher_givcrypt_request *req) goto unlock; crypto_ablkcipher_crt(geniv)->givencrypt = async_chainiv_givencrypt; - get_random_bytes(ctx->iv, crypto_ablkcipher_ivsize(geniv)); + err = crypto_rng_get_bytes(crypto_default_rng, ctx->iv, + crypto_ablkcipher_ivsize(geniv)); unlock: clear_bit(CHAINIV_STATE_INUSE, &ctx->state); + if (err) + return err; + out: return async_chainiv_givencrypt(req); } @@ -284,9 +294,13 @@ static struct crypto_instance *chainiv_alloc(struct rtattr **tb) if (IS_ERR(algt)) return ERR_PTR(err); + err = crypto_get_default_rng(); + if (err) + return ERR_PTR(err); + inst = skcipher_geniv_alloc(&chainiv_tmpl, tb, 0, 0); if (IS_ERR(inst)) - goto out; + goto put_rng; inst->alg.cra_ablkcipher.givencrypt = chainiv_givencrypt_first; @@ -311,12 +325,22 @@ static struct crypto_instance *chainiv_alloc(struct rtattr **tb) out: return inst; + +put_rng: + crypto_put_default_rng(); + goto out; +} + +static void chainiv_free(struct crypto_instance *inst) +{ + skcipher_geniv_free(inst); + crypto_put_default_rng(); } static struct crypto_template chainiv_tmpl = { .name = "chainiv", .alloc = chainiv_alloc, - .free = skcipher_geniv_free, + .free = chainiv_free, .module = THIS_MODULE, }; diff --git a/crypto/eseqiv.c b/crypto/eseqiv.c index f5def21..2a342c8 100644 --- a/crypto/eseqiv.c +++ b/crypto/eseqiv.c @@ -16,13 +16,13 @@ */ #include +#include #include #include #include #include #include #include -#include #include #include #include @@ -163,17 +163,22 @@ static int eseqiv_givencrypt_first(struct skcipher_givcrypt_request *req) { struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req); struct eseqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); + int err = 0; spin_lock_bh(&ctx->lock); if (crypto_ablkcipher_crt(geniv)->givencrypt != eseqiv_givencrypt_first) goto unlock; crypto_ablkcipher_crt(geniv)->givencrypt = eseqiv_givencrypt; - get_random_bytes(ctx->salt, crypto_ablkcipher_ivsize(geniv)); + err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, + crypto_ablkcipher_ivsize(geniv)); unlock: spin_unlock_bh(&ctx->lock); + if (err) + return err; + return eseqiv_givencrypt(req); } @@ -216,9 +221,13 @@ static struct crypto_instance *eseqiv_alloc(struct rtattr **tb) struct crypto_instance *inst; int err; + err = crypto_get_default_rng(); + if (err) + return ERR_PTR(err); + inst = skcipher_geniv_alloc(&eseqiv_tmpl, tb, 0, 0); if (IS_ERR(inst)) - goto out; + goto put_rng; err = -EINVAL; if (inst->alg.cra_ablkcipher.ivsize != inst->alg.cra_blocksize) @@ -238,13 +247,21 @@ out: free_inst: skcipher_geniv_free(inst); inst = ERR_PTR(err); +put_rng: + crypto_put_default_rng(); goto out; } +static void eseqiv_free(struct crypto_instance *inst) +{ + skcipher_geniv_free(inst); + crypto_put_default_rng(); +} + static struct crypto_template eseqiv_tmpl = { .name = "eseqiv", .alloc = eseqiv_alloc, - .free = skcipher_geniv_free, + .free = eseqiv_free, .module = THIS_MODULE, }; diff --git a/crypto/seqiv.c b/crypto/seqiv.c index b903aab..5a013a8 100644 --- a/crypto/seqiv.c +++ b/crypto/seqiv.c @@ -15,11 +15,11 @@ #include #include +#include #include #include #include #include -#include #include #include @@ -189,17 +189,22 @@ static int seqiv_givencrypt_first(struct skcipher_givcrypt_request *req) { struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req); struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); + int err = 0; spin_lock_bh(&ctx->lock); if (crypto_ablkcipher_crt(geniv)->givencrypt != seqiv_givencrypt_first) goto unlock; crypto_ablkcipher_crt(geniv)->givencrypt = seqiv_givencrypt; - get_random_bytes(ctx->salt, crypto_ablkcipher_ivsize(geniv)); + err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, + crypto_ablkcipher_ivsize(geniv)); unlock: spin_unlock_bh(&ctx->lock); + if (err) + return err; + return seqiv_givencrypt(req); } @@ -207,17 +212,22 @@ static int seqiv_aead_givencrypt_first(struct aead_givcrypt_request *req) { struct crypto_aead *geniv = aead_givcrypt_reqtfm(req); struct seqiv_ctx *ctx = crypto_aead_ctx(geniv); + int err = 0; spin_lock_bh(&ctx->lock); if (crypto_aead_crt(geniv)->givencrypt != seqiv_aead_givencrypt_first) goto unlock; crypto_aead_crt(geniv)->givencrypt = seqiv_aead_givencrypt; - get_random_bytes(ctx->salt, crypto_aead_ivsize(geniv)); + err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, + crypto_aead_ivsize(geniv)); unlock: spin_unlock_bh(&ctx->lock); + if (err) + return err; + return seqiv_aead_givencrypt(req); } @@ -298,19 +308,27 @@ static struct crypto_instance *seqiv_alloc(struct rtattr **tb) if (IS_ERR(algt)) return ERR_PTR(err); + err = crypto_get_default_rng(); + if (err) + return ERR_PTR(err); + if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) inst = seqiv_ablkcipher_alloc(tb); else inst = seqiv_aead_alloc(tb); if (IS_ERR(inst)) - goto out; + goto put_rng; inst->alg.cra_alignmask |= __alignof__(u32) - 1; inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx); out: return inst; + +put_rng: + crypto_put_default_rng(); + goto out; } static void seqiv_free(struct crypto_instance *inst) @@ -319,6 +337,7 @@ static void seqiv_free(struct crypto_instance *inst) skcipher_geniv_free(inst); else aead_geniv_free(inst); + crypto_put_default_rng(); } static struct crypto_template seqiv_tmpl = { Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt