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authorHerbert Xu <herbert@gondor.apana.org.au>2015-04-21 10:46:37 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2015-04-22 09:30:07 +0800
commit3c5d8fa9f56ad0928e7a1f06003e5034f5eedb52 (patch)
tree26b035754eb3cf014cbcf7c90351a0bc1711b170
parentff030b099a21a4753af575b4304249e88400e506 (diff)
downloadlinux-3c5d8fa9f56ad0928e7a1f06003e5034f5eedb52.tar.bz2
crypto: rng - Mark crypto_rng_reset seed as const
There is no reason why crypto_rng_reset should modify the seed so this patch marks it as const. Since our algorithms don't export a const seed function yet we have to go through some contortions for now. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r--crypto/rng.c27
-rw-r--r--include/crypto/rng.h9
2 files changed, 28 insertions, 8 deletions
diff --git a/crypto/rng.c b/crypto/rng.c
index 4514d3755f79..f1d64948f6fc 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -42,7 +42,29 @@ static int generate(struct crypto_rng *tfm, const u8 *src, unsigned int slen,
return crypto_rng_alg(tfm)->rng_make_random(tfm, dst, dlen);
}
-static int rngapi_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
+static int rngapi_reset(struct crypto_rng *tfm, const u8 *seed,
+ unsigned int slen)
+{
+ u8 *buf = NULL;
+ u8 *src = (u8 *)seed;
+ int err;
+
+ if (slen) {
+ buf = kmalloc(slen, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ memcpy(buf, seed, slen);
+ src = buf;
+ }
+
+ err = crypto_rng_alg(tfm)->rng_reset(tfm, src, slen);
+
+ kzfree(buf);
+ return err;
+}
+
+int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen)
{
u8 *buf = NULL;
int err;
@@ -56,11 +78,12 @@ static int rngapi_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
seed = buf;
}
- err = crypto_rng_alg(tfm)->rng_reset(tfm, seed, slen);
+ err = tfm->seed(tfm, seed, slen);
kfree(buf);
return err;
}
+EXPORT_SYMBOL_GPL(crypto_rng_reset);
static int crypto_rng_init_tfm(struct crypto_tfm *tfm)
{
diff --git a/include/crypto/rng.h b/include/crypto/rng.h
index f20f068154bc..7fca37144b59 100644
--- a/include/crypto/rng.h
+++ b/include/crypto/rng.h
@@ -19,7 +19,7 @@ struct crypto_rng {
int (*generate)(struct crypto_rng *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int dlen);
- int (*seed)(struct crypto_rng *tfm, u8 *seed, unsigned int slen);
+ int (*seed)(struct crypto_rng *tfm, const u8 *seed, unsigned int slen);
struct crypto_tfm base;
};
@@ -139,11 +139,8 @@ static inline int crypto_rng_get_bytes(struct crypto_rng *tfm,
*
* Return: 0 if the setting of the key was successful; < 0 if an error occurred
*/
-static inline int crypto_rng_reset(struct crypto_rng *tfm,
- u8 *seed, unsigned int slen)
-{
- return tfm->seed(tfm, seed, slen);
-}
+int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed,
+ unsigned int slen);
/**
* crypto_rng_seedsize() - obtain seed size of RNG