diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-04-20 13:39:04 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-04-21 10:19:58 +0800 |
| commit | ff030b099a21a4753af575b4304249e88400e506 (patch) | |
| tree | f54046623574ff38c4da038d3eff37837978aec6 /include/crypto/rng.h | |
| parent | d0e83059a6c9b04f00264a74b8f6439948de4613 (diff) | |
| download | linux-ff030b099a21a4753af575b4304249e88400e506.tar.bz2 | |
crypto: rng - Introduce crypto_rng_generate
This patch adds the new top-level function crypto_rng_generate
which generates random numbers with additional input. It also
extends the mid-level rng_gen_random function to take additional
data as input.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto/rng.h')
| -rw-r--r-- | include/crypto/rng.h | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/include/crypto/rng.h b/include/crypto/rng.h index f13f3faca4d7..f20f068154bc 100644 --- a/include/crypto/rng.h +++ b/include/crypto/rng.h @@ -16,7 +16,9 @@ #include <linux/crypto.h> struct crypto_rng { - int (*generate)(struct crypto_rng *tfm, u8 *rdata, unsigned int dlen); + 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); struct crypto_tfm base; }; @@ -83,6 +85,27 @@ static inline void crypto_free_rng(struct crypto_rng *tfm) } /** + * crypto_rng_generate() - get random number + * @tfm: cipher handle + * @src: Input buffer holding additional data, may be NULL + * @slen: Length of additional data + * @dst: output buffer holding the random numbers + * @dlen: length of the output buffer + * + * This function fills the caller-allocated buffer with random + * numbers using the random number generator referenced by the + * cipher handle. + * + * Return: 0 function was successful; < 0 if an error occurred + */ +static inline int crypto_rng_generate(struct crypto_rng *tfm, + const u8 *src, unsigned int slen, + u8 *dst, unsigned int dlen) +{ + return tfm->generate(tfm, src, slen, dst, dlen); +} + +/** * crypto_rng_get_bytes() - get random number * @tfm: cipher handle * @rdata: output buffer holding the random numbers @@ -96,7 +119,7 @@ static inline void crypto_free_rng(struct crypto_rng *tfm) static inline int crypto_rng_get_bytes(struct crypto_rng *tfm, u8 *rdata, unsigned int dlen) { - return tfm->generate(tfm, rdata, dlen); + return crypto_rng_generate(tfm, NULL, 0, rdata, dlen); } /** |