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Date: Thu, 14 Aug 2008 22:23:31 +1000
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Neil Horman <nhorman@...driver.com>
Cc: linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
davem@...emloft.net
Subject: crypto: skcipher - Use RNG interface instead of get_random_bytes
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.
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);
--
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