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crypto: drbg - Convert to new rng interface

Bläddra i källkod 
This patch converts the DRBG implementation to the new low-level
rng interface.

This allows us to get rid of struct drbg_gen by using the new RNG
API instead.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Stephan Mueller <smueller@chronox.de>
This commit is contained in:
Herbert Xu
2015-04-21 10:46:41 +08:00
förälder 881cd6c570
incheckning 8fded5925d
2 ändrade filer med 65 tillägg och 106 borttagningar
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121
crypto/drbg.c
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@@ -235,7 +235,7 @@ static bool drbg_fips_continuous_test(struct drbg_state *drbg,
#ifdef CONFIG_CRYPTO_FIPS
int ret = 0;
/* skip test if we test the overall system */
if (drbg->test_data)
if (list_empty(&drbg->test_data.list))
return true;
/* only perform test in FIPS mode */
if (0 == fips_enabled)
@@ -1068,9 +1068,9 @@ static int drbg_seed(struct drbg_state *drbg, struct drbg_string *pers,
return -EINVAL;
}
if (drbg->test_data && drbg->test_data->testentropy) {
drbg_string_fill(&data1, drbg->test_data->testentropy->buf,
drbg->test_data->testentropy->len);
if (list_empty(&drbg->test_data.list)) {
drbg_string_fill(&data1, drbg->test_data.buf,
drbg->test_data.len);
pr_devel("DRBG: using test entropy\n");
} else {
/*
@@ -1471,15 +1471,16 @@ static int drbg_uninstantiate(struct drbg_state *drbg)
* Helper function for setting the test data in the DRBG
*
* @drbg DRBG state handle
* @test_data test data to sets
* @data test data
* @len test data length
*/
static inline void drbg_set_testdata(struct drbg_state *drbg,
struct drbg_test_data *test_data)
static void drbg_kcapi_set_entropy(struct crypto_rng *tfm,
const u8 *data, unsigned int len)
{
if (!test_data || !test_data->testentropy)
return;
mutex_lock(&drbg->drbg_mutex);;
drbg->test_data = test_data;
struct drbg_state *drbg = crypto_rng_ctx(tfm);
mutex_lock(&drbg->drbg_mutex);
drbg_string_fill(&drbg->test_data, data, len);
mutex_unlock(&drbg->drbg_mutex);
}
@@ -1645,63 +1646,49 @@ static void drbg_kcapi_cleanup(struct crypto_tfm *tfm)
* Generate random numbers invoked by the kernel crypto API:
* The API of the kernel crypto API is extended as follows:
*
* If dlen is larger than zero, rdata is interpreted as the output buffer
* where random data is to be stored.
*
* If dlen is zero, rdata is interpreted as a pointer to a struct drbg_gen
* which holds the additional information string that is used for the
* DRBG generation process. The output buffer that is to be used to store
* data is also pointed to by struct drbg_gen.
* src is additional input supplied to the RNG.
* slen is the length of src.
* dst is the output buffer where random data is to be stored.
* dlen is the length of dst.
*/
static int drbg_kcapi_random(struct crypto_rng *tfm, u8 *rdata,
unsigned int dlen)
static int drbg_kcapi_random(struct crypto_rng *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int dlen)
{
struct drbg_state *drbg = crypto_rng_ctx(tfm);
if (0 < dlen) {
return drbg_generate_long(drbg, rdata, dlen, NULL);
} else {
struct drbg_gen *data = (struct drbg_gen *)rdata;
struct drbg_string addtl;
/* catch NULL pointer */
if (!data)
return 0;
drbg_set_testdata(drbg, data->test_data);
struct drbg_string *addtl = NULL;
struct drbg_string string;
if (slen) {
/* linked list variable is now local to allow modification */
drbg_string_fill(&addtl, data->addtl->buf, data->addtl->len);
return drbg_generate_long(drbg, data->outbuf, data->outlen,
&addtl);
drbg_string_fill(&string, src, slen);
addtl = &string;
}
return drbg_generate_long(drbg, dst, dlen, addtl);
}
/*
* Seed the DRBG invoked by the kernel crypto API
* Similar to the generate function of drbg_kcapi_random, this
* function extends the kernel crypto API interface with struct drbg_gen
*/
static int drbg_kcapi_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
static int drbg_kcapi_seed(struct crypto_rng *tfm,
const u8 *seed, unsigned int slen)
{
struct drbg_state *drbg = crypto_rng_ctx(tfm);
struct crypto_tfm *tfm_base = crypto_rng_tfm(tfm);
bool pr = false;
struct drbg_string seed_string;
struct drbg_string string;
struct drbg_string *seed_string = NULL;
int coreref = 0;
drbg_convert_tfm_core(crypto_tfm_alg_driver_name(tfm_base), &coreref,
&pr);
if (0 < slen) {
drbg_string_fill(&seed_string, seed, slen);
return drbg_instantiate(drbg, &seed_string, coreref, pr);
} else {
struct drbg_gen *data = (struct drbg_gen *)seed;
/* allow invocation of API call with NULL, 0 */
if (!data)
return drbg_instantiate(drbg, NULL, coreref, pr);
drbg_set_testdata(drbg, data->test_data);
/* linked list variable is now local to allow modification */
drbg_string_fill(&seed_string, data->addtl->buf,
data->addtl->len);
return drbg_instantiate(drbg, &seed_string, coreref, pr);
drbg_string_fill(&string, seed, slen);
seed_string = &string;
}
return drbg_instantiate(drbg, seed_string, coreref, pr);
}
/***************************************************************
@@ -1793,32 +1780,31 @@ outbuf:
#endif /* CONFIG_CRYPTO_FIPS */
}
static struct crypto_alg drbg_algs[22];
static struct rng_alg drbg_algs[22];
/*
* Fill the array drbg_algs used to register the different DRBGs
* with the kernel crypto API. To fill the array, the information
* from drbg_cores[] is used.
*/
static inline void __init drbg_fill_array(struct crypto_alg *alg,
static inline void __init drbg_fill_array(struct rng_alg *alg,
const struct drbg_core *core, int pr)
{
int pos = 0;
static int priority = 100;
memset(alg, 0, sizeof(struct crypto_alg));
memcpy(alg->cra_name, "stdrng", 6);
memcpy(alg->base.cra_name, "stdrng", 6);
if (pr) {
memcpy(alg->cra_driver_name, "drbg_pr_", 8);
memcpy(alg->base.cra_driver_name, "drbg_pr_", 8);
pos = 8;
} else {
memcpy(alg->cra_driver_name, "drbg_nopr_", 10);
memcpy(alg->base.cra_driver_name, "drbg_nopr_", 10);
pos = 10;
}
memcpy(alg->cra_driver_name + pos, core->cra_name,
memcpy(alg->base.cra_driver_name + pos, core->cra_name,
strlen(core->cra_name));
alg->cra_priority = priority;
alg->base.cra_priority = priority;
priority++;
/*
* If FIPS mode enabled, the selected DRBG shall have the
@@ -1826,17 +1812,16 @@ static inline void __init drbg_fill_array(struct crypto_alg *alg,
* it is selected.
*/
if (fips_enabled)
alg->cra_priority += 200;
alg->base.cra_priority += 200;
alg->cra_flags = CRYPTO_ALG_TYPE_RNG;
alg->cra_ctxsize = sizeof(struct drbg_state);
alg->cra_type = &crypto_rng_type;
alg->cra_module = THIS_MODULE;
alg->cra_init = drbg_kcapi_init;
alg->cra_exit = drbg_kcapi_cleanup;
alg->cra_u.rng.rng_make_random = drbg_kcapi_random;
alg->cra_u.rng.rng_reset = drbg_kcapi_reset;
alg->cra_u.rng.seedsize = 0;
alg->base.cra_ctxsize = sizeof(struct drbg_state);
alg->base.cra_module = THIS_MODULE;
alg->base.cra_init = drbg_kcapi_init;
alg->base.cra_exit = drbg_kcapi_cleanup;
alg->generate = drbg_kcapi_random;
alg->seed = drbg_kcapi_seed;
alg->set_ent = drbg_kcapi_set_entropy;
alg->seedsize = 0;
}
static int __init drbg_init(void)
@@ -1869,12 +1854,12 @@ static int __init drbg_init(void)
drbg_fill_array(&drbg_algs[i], &drbg_cores[j], 1);
for (j = 0; ARRAY_SIZE(drbg_cores) > j; j++, i++)
drbg_fill_array(&drbg_algs[i], &drbg_cores[j], 0);
return crypto_register_algs(drbg_algs, (ARRAY_SIZE(drbg_cores) * 2));
return crypto_register_rngs(drbg_algs, (ARRAY_SIZE(drbg_cores) * 2));
}
static void __exit drbg_exit(void)
{
crypto_unregister_algs(drbg_algs, (ARRAY_SIZE(drbg_cores) * 2));
crypto_unregister_rngs(drbg_algs, (ARRAY_SIZE(drbg_cores) * 2));
}
module_init(drbg_init);