diff options
Diffstat (limited to 'kernel/crypto/rng.c')
| -rw-r--r-- | kernel/crypto/rng.c | 132 |
1 files changed, 107 insertions, 25 deletions
diff --git a/kernel/crypto/rng.c b/kernel/crypto/rng.c index e0a25c245..b81cffb13 100644 --- a/kernel/crypto/rng.c +++ b/kernel/crypto/rng.c @@ -4,6 +4,7 @@ * RNG operations. * * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com> + * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au> * * 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 @@ -24,12 +25,19 @@ #include <linux/cryptouser.h> #include <net/netlink.h> +#include "internal.h" + static DEFINE_MUTEX(crypto_default_rng_lock); struct crypto_rng *crypto_default_rng; EXPORT_SYMBOL_GPL(crypto_default_rng); static int crypto_default_rng_refcnt; -static int rngapi_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen) +static inline struct crypto_rng *__crypto_rng_cast(struct crypto_tfm *tfm) +{ + return container_of(tfm, struct crypto_rng, base); +} + +int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen) { u8 *buf = NULL; int err; @@ -43,21 +51,23 @@ 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 = crypto_rng_alg(tfm)->seed(tfm, seed, slen); - kfree(buf); + kzfree(buf); return err; } +EXPORT_SYMBOL_GPL(crypto_rng_reset); -static int crypto_init_rng_ops(struct crypto_tfm *tfm, u32 type, u32 mask) +static int crypto_rng_init_tfm(struct crypto_tfm *tfm) { - struct rng_alg *alg = &tfm->__crt_alg->cra_rng; - struct rng_tfm *ops = &tfm->crt_rng; + return 0; +} - ops->rng_gen_random = alg->rng_make_random; - ops->rng_reset = rngapi_reset; +static unsigned int seedsize(struct crypto_alg *alg) +{ + struct rng_alg *ralg = container_of(alg, struct rng_alg, base); - return 0; + return ralg->seedsize; } #ifdef CONFIG_NET @@ -67,7 +77,7 @@ static int crypto_rng_report(struct sk_buff *skb, struct crypto_alg *alg) strncpy(rrng.type, "rng", sizeof(rrng.type)); - rrng.seedsize = alg->cra_rng.seedsize; + rrng.seedsize = seedsize(alg); if (nla_put(skb, CRYPTOCFGA_REPORT_RNG, sizeof(struct crypto_report_rng), &rrng)) @@ -89,24 +99,27 @@ static void crypto_rng_show(struct seq_file *m, struct crypto_alg *alg) static void crypto_rng_show(struct seq_file *m, struct crypto_alg *alg) { seq_printf(m, "type : rng\n"); - seq_printf(m, "seedsize : %u\n", alg->cra_rng.seedsize); -} - -static unsigned int crypto_rng_ctxsize(struct crypto_alg *alg, u32 type, - u32 mask) -{ - return alg->cra_ctxsize; + seq_printf(m, "seedsize : %u\n", seedsize(alg)); } -const struct crypto_type crypto_rng_type = { - .ctxsize = crypto_rng_ctxsize, - .init = crypto_init_rng_ops, +static const struct crypto_type crypto_rng_type = { + .extsize = crypto_alg_extsize, + .init_tfm = crypto_rng_init_tfm, #ifdef CONFIG_PROC_FS .show = crypto_rng_show, #endif .report = crypto_rng_report, + .maskclear = ~CRYPTO_ALG_TYPE_MASK, + .maskset = CRYPTO_ALG_TYPE_MASK, + .type = CRYPTO_ALG_TYPE_RNG, + .tfmsize = offsetof(struct crypto_rng, base), }; -EXPORT_SYMBOL_GPL(crypto_rng_type); + +struct crypto_rng *crypto_alloc_rng(const char *alg_name, u32 type, u32 mask) +{ + return crypto_alloc_tfm(alg_name, &crypto_rng_type, type, mask); +} +EXPORT_SYMBOL_GPL(crypto_alloc_rng); int crypto_get_default_rng(void) { @@ -142,13 +155,82 @@ EXPORT_SYMBOL_GPL(crypto_get_default_rng); void crypto_put_default_rng(void) { mutex_lock(&crypto_default_rng_lock); - if (!--crypto_default_rng_refcnt) { - crypto_free_rng(crypto_default_rng); - crypto_default_rng = NULL; - } + crypto_default_rng_refcnt--; mutex_unlock(&crypto_default_rng_lock); } EXPORT_SYMBOL_GPL(crypto_put_default_rng); +#if defined(CONFIG_CRYPTO_RNG) || defined(CONFIG_CRYPTO_RNG_MODULE) +int crypto_del_default_rng(void) +{ + int err = -EBUSY; + + mutex_lock(&crypto_default_rng_lock); + if (crypto_default_rng_refcnt) + goto out; + + crypto_free_rng(crypto_default_rng); + crypto_default_rng = NULL; + + err = 0; + +out: + mutex_unlock(&crypto_default_rng_lock); + + return err; +} +EXPORT_SYMBOL_GPL(crypto_del_default_rng); +#endif + +int crypto_register_rng(struct rng_alg *alg) +{ + struct crypto_alg *base = &alg->base; + + if (alg->seedsize > PAGE_SIZE / 8) + return -EINVAL; + + base->cra_type = &crypto_rng_type; + base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; + base->cra_flags |= CRYPTO_ALG_TYPE_RNG; + + return crypto_register_alg(base); +} +EXPORT_SYMBOL_GPL(crypto_register_rng); + +void crypto_unregister_rng(struct rng_alg *alg) +{ + crypto_unregister_alg(&alg->base); +} +EXPORT_SYMBOL_GPL(crypto_unregister_rng); + +int crypto_register_rngs(struct rng_alg *algs, int count) +{ + int i, ret; + + for (i = 0; i < count; i++) { + ret = crypto_register_rng(algs + i); + if (ret) + goto err; + } + + return 0; + +err: + for (--i; i >= 0; --i) + crypto_unregister_rng(algs + i); + + return ret; +} +EXPORT_SYMBOL_GPL(crypto_register_rngs); + +void crypto_unregister_rngs(struct rng_alg *algs, int count) +{ + int i; + + for (i = count - 1; i >= 0; --i) + crypto_unregister_rng(algs + i); +} +EXPORT_SYMBOL_GPL(crypto_unregister_rngs); + MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Random Number Generator"); |