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authorHerbert Xu <herbert@gondor.apana.org.au>2008-08-14 22:21:31 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2008-08-29 15:50:06 +1000
commita0f000ec9b61b99111757df138b11144236fc59b (patch)
treebd698163c48b5cd6d6a3c05c8d34d862ebcd86ed /crypto/chainiv.c
parent17f0f4a47df9aea9ee26c939f8057c35e0be1847 (diff)
downloadlinux-a0f000ec9b61b99111757df138b11144236fc59b.tar.gz
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@gondor.apana.org.au>
Diffstat (limited to 'crypto/chainiv.c')
-rw-r--r--crypto/chainiv.c34
1 files changed, 29 insertions, 5 deletions
diff --git a/crypto/chainiv.c b/crypto/chainiv.c
index cf68d4365347..7c37a497b860 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>
@@ -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,
};