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>
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 2274293..39dbd8e 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -41,6 +41,7 @@
config CRYPTO_BLKCIPHER
tristate
select CRYPTO_ALGAPI
+ select CRYPTO_RNG
config CRYPTO_HASH
tristate
@@ -125,6 +126,7 @@
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 <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 @@
{
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 @@
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 @@
{
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 @@
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 @@
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 @@
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 <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>
@@ -163,17 +163,22 @@
{
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 @@
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 @@
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 <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>
@@ -189,17 +189,22 @@
{
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 @@
{
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 @@
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 @@
skcipher_geniv_free(inst);
else
aead_geniv_free(inst);
+ crypto_put_default_rng();
}
static struct crypto_template seqiv_tmpl = {