mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
228 lines
4.7 KiB
228 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Cryptographic API. |
|
* |
|
* RNG operations. |
|
* |
|
* Copyright (c) 2008 Neil Horman <[email protected]> |
|
* Copyright (c) 2015 Herbert Xu <[email protected]> |
|
*/ |
|
|
|
#include <linux/atomic.h> |
|
#include <crypto/internal/rng.h> |
|
#include <linux/err.h> |
|
#include <linux/module.h> |
|
#include <linux/mutex.h> |
|
#include <linux/random.h> |
|
#include <linux/seq_file.h> |
|
#include <linux/slab.h> |
|
#include <linux/string.h> |
|
#include <linux/cryptouser.h> |
|
#include <linux/compiler.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; |
|
|
|
int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen) |
|
{ |
|
struct crypto_alg *alg = tfm->base.__crt_alg; |
|
u8 *buf = NULL; |
|
int err; |
|
|
|
if (!seed && slen) { |
|
buf = kmalloc(slen, GFP_KERNEL); |
|
if (!buf) |
|
return -ENOMEM; |
|
|
|
err = get_random_bytes_wait(buf, slen); |
|
if (err) |
|
goto out; |
|
seed = buf; |
|
} |
|
|
|
crypto_stats_get(alg); |
|
err = crypto_rng_alg(tfm)->seed(tfm, seed, slen); |
|
crypto_stats_rng_seed(alg, err); |
|
out: |
|
kfree_sensitive(buf); |
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(crypto_rng_reset); |
|
|
|
static int crypto_rng_init_tfm(struct crypto_tfm *tfm) |
|
{ |
|
return 0; |
|
} |
|
|
|
static unsigned int seedsize(struct crypto_alg *alg) |
|
{ |
|
struct rng_alg *ralg = container_of(alg, struct rng_alg, base); |
|
|
|
return ralg->seedsize; |
|
} |
|
|
|
#ifdef CONFIG_NET |
|
static int crypto_rng_report(struct sk_buff *skb, struct crypto_alg *alg) |
|
{ |
|
struct crypto_report_rng rrng; |
|
|
|
memset(&rrng, 0, sizeof(rrng)); |
|
|
|
strscpy(rrng.type, "rng", sizeof(rrng.type)); |
|
|
|
rrng.seedsize = seedsize(alg); |
|
|
|
return nla_put(skb, CRYPTOCFGA_REPORT_RNG, sizeof(rrng), &rrng); |
|
} |
|
#else |
|
static int crypto_rng_report(struct sk_buff *skb, struct crypto_alg *alg) |
|
{ |
|
return -ENOSYS; |
|
} |
|
#endif |
|
|
|
static void crypto_rng_show(struct seq_file *m, struct crypto_alg *alg) |
|
__maybe_unused; |
|
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", seedsize(alg)); |
|
} |
|
|
|
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), |
|
}; |
|
|
|
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) |
|
{ |
|
struct crypto_rng *rng; |
|
int err; |
|
|
|
mutex_lock(&crypto_default_rng_lock); |
|
if (!crypto_default_rng) { |
|
rng = crypto_alloc_rng("stdrng", 0, 0); |
|
err = PTR_ERR(rng); |
|
if (IS_ERR(rng)) |
|
goto unlock; |
|
|
|
err = crypto_rng_reset(rng, NULL, crypto_rng_seedsize(rng)); |
|
if (err) { |
|
crypto_free_rng(rng); |
|
goto unlock; |
|
} |
|
|
|
crypto_default_rng = rng; |
|
} |
|
|
|
crypto_default_rng_refcnt++; |
|
err = 0; |
|
|
|
unlock: |
|
mutex_unlock(&crypto_default_rng_lock); |
|
|
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(crypto_get_default_rng); |
|
|
|
void crypto_put_default_rng(void) |
|
{ |
|
mutex_lock(&crypto_default_rng_lock); |
|
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");
|
|
|