rng.h

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/*
 * RNG: Random Number Generator  algorithms under the crypto API
 *
 * Copyright (c) 2008 Neil Horman <[email protected]>
 *
 * 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