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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-04-21 10:46:37 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-04-22 09:30:07 +0800 |
| commit | 3c5d8fa9f56ad0928e7a1f06003e5034f5eedb52 (patch) | |
| tree | 26b035754eb3cf014cbcf7c90351a0bc1711b170 /crypto/rng.c | |
| parent | ff030b099a21a4753af575b4304249e88400e506 (diff) | |
| download | lwn-3c5d8fa9f56ad0928e7a1f06003e5034f5eedb52.tar.gz lwn-3c5d8fa9f56ad0928e7a1f06003e5034f5eedb52.zip | |
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>
Diffstat (limited to 'crypto/rng.c')
| -rw-r--r-- | crypto/rng.c | 27 |
1 files changed, 25 insertions, 2 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) { |