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crypto: drbg - Install separate seed functions for pr and nopr

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Set rng_alg::seed to different functions for the prediction-resistant
and non-prediction-resistant algorithms, so that the function does not
need to parse the algorithm name to figure out which algorithm it is.

Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2026-04-19 23:34:08 -07:00 committed by Herbert Xu
parent e8806e2e97
commit 7f0ef29864
1 changed files with 16 additions and 9 deletions
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25
crypto/drbg.c
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@ -733,16 +733,11 @@ static int drbg_kcapi_random(struct crypto_rng *tfm,
return drbg_generate_long(drbg, dst, dlen, addtl);
}
/*
* Seed the DRBG invoked by the kernel crypto API
*/
/* Seed (i.e. instantiate) or re-seed the DRBG. */
static int drbg_kcapi_seed(struct crypto_rng *tfm,
const u8 *seed, unsigned int slen)
const u8 *seed, unsigned int slen, bool pr)
{
struct drbg_state *drbg = crypto_rng_ctx(tfm);
struct crypto_tfm *tfm_base = crypto_rng_tfm(tfm);
bool pr = memcmp(crypto_tfm_alg_driver_name(tfm_base),
"drbg_nopr_", 10) != 0;
struct drbg_string string;
struct drbg_string *seed_string = NULL;
@ -754,6 +749,18 @@ static int drbg_kcapi_seed(struct crypto_rng *tfm,
return drbg_instantiate(drbg, seed_string, pr);
}
static int drbg_kcapi_seed_pr(struct crypto_rng *tfm,
const u8 *seed, unsigned int slen)
{
return drbg_kcapi_seed(tfm, seed, slen, /* pr= */ true);
}
static int drbg_kcapi_seed_nopr(struct crypto_rng *tfm,
const u8 *seed, unsigned int slen)
{
return drbg_kcapi_seed(tfm, seed, slen, /* pr= */ false);
}
/***************************************************************
* Kernel module: code to load the module
***************************************************************/
@ -827,7 +834,7 @@ static struct rng_alg drbg_algs[] = {
.base.cra_module = THIS_MODULE,
.base.cra_init = drbg_kcapi_init,
.set_ent = drbg_kcapi_set_entropy,
.seed = drbg_kcapi_seed,
.seed = drbg_kcapi_seed_pr,
.generate = drbg_kcapi_random,
.base.cra_exit = drbg_kcapi_cleanup,
},
@ -839,7 +846,7 @@ static struct rng_alg drbg_algs[] = {
.base.cra_module = THIS_MODULE,
.base.cra_init = drbg_kcapi_init,
.set_ent = drbg_kcapi_set_entropy,
.seed = drbg_kcapi_seed,
.seed = drbg_kcapi_seed_nopr,
.generate = drbg_kcapi_random,
.base.cra_exit = drbg_kcapi_cleanup,
},