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Date: Thu, 14 Aug 2008 11:28:35 -0400
From: Neil Horman <nhorman@...driver.com>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
davem@...emloft.net
Subject: Re: crypto: skcipher - Use RNG interface instead of get_random_bytes
On Thu, Aug 14, 2008 at 10:23:31PM +1000, Herbert Xu wrote:
> On Thu, Aug 14, 2008 at 09:51:37PM +1000, Herbert Xu wrote:
> >
> > Here is the final result against cryptodev-2.6. Let me know if
> > you're OK with it and I'll push it out.
>
> And here is the IV generator patch on top.
>
Thumbs up. Thanks Herbert!
Acked-by: Neil Horman <nhorman@...driver.com>
> Cheers,
> --
> Visit Openswan at http://www.openswan.org/
> Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
> --
> commit 560a63d94d36641c83a8f533ed87bab95f6298bb
> Author: Herbert Xu <herbert@...dor.apana.org.au>
> 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 <herbert@...dor.apana.org.au>
>
> 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 9affade..330b5e4 100644
> --- a/crypto/chainiv.c
> +++ b/crypto/chainiv.c
> @@ -14,11 +14,11 @@
> */
>
> #include <crypto/internal/skcipher.h>
> +#include <crypto/rng.h>
> #include <linux/err.h>
> #include <linux/init.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> -#include <linux/random.h>
> #include <linux/spinlock.h>
> #include <linux/string.h>
> #include <linux/workqueue.h>
> @@ -44,6 +44,8 @@ struct async_chainiv_ctx {
> char iv[];
> };
>
> +static struct crypto_rng *rng;
> +
> static int chainiv_givencrypt(struct skcipher_givcrypt_request *req)
> {
> struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
> @@ -83,6 +85,7 @@ 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 +93,15 @@ 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(rng, ctx->iv,
> + crypto_ablkcipher_ivsize(geniv));
>
> unlock:
> spin_unlock_bh(&ctx->lock);
>
> + if (err)
> + return err;
> +
> return chainiv_givencrypt(req);
> }
>
> @@ -203,6 +210,7 @@ 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 +220,15 @@ 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(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);
> }
> @@ -322,10 +334,30 @@ static struct crypto_template chainiv_tmpl = {
>
> int __init chainiv_module_init(void)
> {
> - return crypto_register_template(&chainiv_tmpl);
> + int err;
> +
> + rng = crypto_alloc_rng("stdrng", 0, 0);
> + if (IS_ERR(rng))
> + return PTR_ERR(rng);
> +
> + err = crypto_rng_reset(rng, NULL, crypto_rng_seedsize(rng));
> + if (err)
> + goto free_rng;
> +
> + err = crypto_register_template(&chainiv_tmpl);
> + if (err)
> + goto free_rng;
> +
> +out:
> + return err;
> +
> +free_rng:
> + crypto_free_rng(rng);
> + goto out;
> }
>
> void chainiv_module_exit(void)
> {
> crypto_unregister_template(&chainiv_tmpl);
> + crypto_free_rng(rng);
> }
> diff --git a/crypto/eseqiv.c b/crypto/eseqiv.c
> index 881d309..b450943 100644
> --- a/crypto/eseqiv.c
> +++ b/crypto/eseqiv.c
> @@ -16,13 +16,13 @@
> */
>
> #include <crypto/internal/skcipher.h>
> +#include <crypto/rng.h>
> #include <crypto/scatterwalk.h>
> #include <linux/err.h>
> #include <linux/init.h>
> #include <linux/kernel.h>
> #include <linux/mm.h>
> #include <linux/module.h>
> -#include <linux/random.h>
> #include <linux/scatterlist.h>
> #include <linux/spinlock.h>
> #include <linux/string.h>
> @@ -39,6 +39,8 @@ struct eseqiv_ctx {
> char salt[];
> };
>
> +static struct crypto_rng *rng;
> +
> static void eseqiv_complete2(struct skcipher_givcrypt_request *req)
> {
> struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
> @@ -163,17 +165,22 @@ 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(rng, ctx->salt,
> + crypto_ablkcipher_ivsize(geniv));
>
> unlock:
> spin_unlock_bh(&ctx->lock);
>
> + if (err)
> + return err;
> +
> return eseqiv_givencrypt(req);
> }
>
> @@ -250,10 +257,30 @@ static struct crypto_template eseqiv_tmpl = {
>
> int __init eseqiv_module_init(void)
> {
> - return crypto_register_template(&eseqiv_tmpl);
> + int err;
> +
> + rng = crypto_alloc_rng("stdrng", 0, 0);
> + if (IS_ERR(rng))
> + return PTR_ERR(rng);
> +
> + err = crypto_rng_reset(rng, NULL, crypto_rng_seedsize(rng));
> + if (err)
> + goto free_rng;
> +
> + err = crypto_register_template(&eseqiv_tmpl);
> + if (err)
> + goto free_rng;
> +
> +out:
> + return err;
> +
> +free_rng:
> + crypto_free_rng(rng);
> + goto out;
> }
>
> void __exit eseqiv_module_exit(void)
> {
> crypto_unregister_template(&eseqiv_tmpl);
> + crypto_free_rng(rng);
> }
> diff --git a/crypto/seqiv.c b/crypto/seqiv.c
> index b903aab..1b95c0e 100644
> --- a/crypto/seqiv.c
> +++ b/crypto/seqiv.c
> @@ -15,11 +15,11 @@
>
> #include <crypto/internal/aead.h>
> #include <crypto/internal/skcipher.h>
> +#include <crypto/rng.h>
> #include <linux/err.h>
> #include <linux/init.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> -#include <linux/random.h>
> #include <linux/spinlock.h>
> #include <linux/string.h>
>
> @@ -28,6 +28,8 @@ struct seqiv_ctx {
> u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
> };
>
> +static struct crypto_rng *rng;
> +
> static void seqiv_complete2(struct skcipher_givcrypt_request *req, int err)
> {
> struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
> @@ -189,17 +191,22 @@ 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(rng, ctx->salt,
> + crypto_ablkcipher_ivsize(geniv));
>
> unlock:
> spin_unlock_bh(&ctx->lock);
>
> + if (err)
> + return err;
> +
> return seqiv_givencrypt(req);
> }
>
> @@ -207,17 +214,21 @@ 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(rng, ctx->salt, crypto_aead_ivsize(geniv));
>
> unlock:
> spin_unlock_bh(&ctx->lock);
>
> + if (err)
> + return err;
> +
> return seqiv_aead_givencrypt(req);
> }
>
> @@ -330,12 +341,32 @@ static struct crypto_template seqiv_tmpl = {
>
> static int __init seqiv_module_init(void)
> {
> - return crypto_register_template(&seqiv_tmpl);
> + int err;
> +
> + rng = crypto_alloc_rng("stdrng", 0, 0);
> + if (IS_ERR(rng))
> + return PTR_ERR(rng);
> +
> + err = crypto_rng_reset(rng, NULL, crypto_rng_seedsize(rng));
> + if (err)
> + goto free_rng;
> +
> + err = crypto_register_template(&seqiv_tmpl);
> + if (err)
> + goto free_rng;
> +
> +out:
> + return err;
> +
> +free_rng:
> + crypto_free_rng(rng);
> + goto out;
> }
>
> static void __exit seqiv_module_exit(void)
> {
> crypto_unregister_template(&seqiv_tmpl);
> + crypto_free_rng(rng);
> }
>
> module_init(seqiv_module_init);
--
/***************************************************
*Neil Horman
*nhorman@...driver.com
*gpg keyid: 1024D / 0x92A74FA1
*http://pgp.mit.edu
***************************************************/
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