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author | Neil Horman <nhorman@tuxdriver.com> | 2008-08-14 22:15:52 +1000 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2008-08-29 15:50:04 +1000 |
commit | 17f0f4a47df9aea9ee26c939f8057c35e0be1847 (patch) | |
tree | d6c7ff6c93573227a49c9e8fe06c53d97950e4e6 /include/crypto/rng.h | |
parent | ccb778e1841ce04b4c10b39f0dd2558ab2c6dcd4 (diff) | |
download | kernel_samsung_crespo-17f0f4a47df9aea9ee26c939f8057c35e0be1847.zip kernel_samsung_crespo-17f0f4a47df9aea9ee26c939f8057c35e0be1847.tar.gz kernel_samsung_crespo-17f0f4a47df9aea9ee26c939f8057c35e0be1847.tar.bz2 |
crypto: rng - RNG interface and implementation
This patch adds a random number generator interface as well as a
cryptographic pseudo-random number generator based on AES. It is
meant to be used in cases where a deterministic CPRNG is required.
One of the first applications will be as an input in the IPsec IV
generation process.
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto/rng.h')
-rw-r--r-- | include/crypto/rng.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/include/crypto/rng.h b/include/crypto/rng.h new file mode 100644 index 0000000..c93f9b9 --- /dev/null +++ b/include/crypto/rng.h @@ -0,0 +1,75 @@ +/* + * RNG: Random Number Generator algorithms under the crypto API + * + * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + */ + +#ifndef _CRYPTO_RNG_H +#define _CRYPTO_RNG_H + +#include <linux/crypto.h> + +extern struct crypto_rng *crypto_default_rng; + +int crypto_get_default_rng(void); +void crypto_put_default_rng(void); + +static inline struct crypto_rng *__crypto_rng_cast(struct crypto_tfm *tfm) +{ + return (struct crypto_rng *)tfm; +} + +static inline struct crypto_rng *crypto_alloc_rng(const char *alg_name, + u32 type, u32 mask) +{ + type &= ~CRYPTO_ALG_TYPE_MASK; + type |= CRYPTO_ALG_TYPE_RNG; + mask |= CRYPTO_ALG_TYPE_MASK; + + return __crypto_rng_cast(crypto_alloc_base(alg_name, type, mask)); +} + +static inline struct crypto_tfm *crypto_rng_tfm(struct crypto_rng *tfm) +{ + return &tfm->base; +} + +static inline struct rng_alg *crypto_rng_alg(struct crypto_rng *tfm) +{ + return &crypto_rng_tfm(tfm)->__crt_alg->cra_rng; +} + +static inline struct rng_tfm *crypto_rng_crt(struct crypto_rng *tfm) +{ + return &crypto_rng_tfm(tfm)->crt_rng; +} + +static inline void crypto_free_rng(struct crypto_rng *tfm) +{ + crypto_free_tfm(crypto_rng_tfm(tfm)); +} + +static inline int crypto_rng_get_bytes(struct crypto_rng *tfm, + u8 *rdata, unsigned int dlen) +{ + return crypto_rng_crt(tfm)->rng_gen_random(tfm, rdata, dlen); +} + +static inline int crypto_rng_reset(struct crypto_rng *tfm, + u8 *seed, unsigned int slen) +{ + return crypto_rng_crt(tfm)->rng_reset(tfm, seed, slen); +} + +static inline int crypto_rng_seedsize(struct crypto_rng *tfm) +{ + return crypto_rng_alg(tfm)->seedsize; +} + +#endif |