mirror of
https://github.com/edk2-porting/linux-next.git
synced 2025-01-06 20:53:54 +08:00
ce8ce31b2c
There are two different randomness sources the DRBGs are getting seeded from, namely the jitterentropy source (if enabled) and get_random_bytes(). At initial DRBG seeding time during boot, the latter might not have collected sufficient entropy for seeding itself yet and thus, the DRBG implementation schedules a reseed work from a random_ready_callback once that has happened. This is particularly important for the !->pr DRBG instances, for which (almost) no further reseeds are getting triggered during their lifetime. Because collecting data from the jitterentropy source is a rather expensive operation, the aforementioned asynchronously scheduled reseed work restricts itself to get_random_bytes() only. That is, it in some sense amends the initial DRBG seed derived from jitterentropy output at full (estimated) entropy with fresh randomness obtained from get_random_bytes() once that has been seeded with sufficient entropy itself. With the advent of rng_is_initialized(), there is no real need for doing the reseed operation from an asynchronously scheduled work anymore and a subsequent patch will make it synchronous by moving it next to related logic already present in drbg_generate(). However, for tracking whether a full reseed including the jitterentropy source is required or a "partial" reseed involving only get_random_bytes() would be sufficient already, the boolean struct drbg_state's ->seeded member must become a tristate value. Prepare for this by introducing the new enum drbg_seed_state and change struct drbg_state's ->seeded member's type from bool to that type. For facilitating review, enum drbg_seed_state is made to only contain two members corresponding to the former ->seeded values of false and true resp. at this point: DRBG_SEED_STATE_UNSEEDED and DRBG_SEED_STATE_FULL. A third one for tracking the intermediate state of "seeded from jitterentropy only" will be introduced with a subsequent patch. There is no change in behaviour at this point. Signed-off-by: Nicolai Stange <nstange@suse.de> Reviewed-by: Stephan Müller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> |
||
|---|---|---|
| .. | ||
| internal | ||
| acompress.h | ||
| aead.h | ||
| aes.h | ||
| akcipher.h | ||
| algapi.h | ||
| arc4.h | ||
| asym_tpm_subtype.h | ||
| authenc.h | ||
| b128ops.h | ||
| blake2b.h | ||
| blake2s.h | ||
| blowfish.h | ||
| cast5.h | ||
| cast6.h | ||
| cast_common.h | ||
| chacha20poly1305.h | ||
| chacha.h | ||
| cryptd.h | ||
| ctr.h | ||
| curve25519.h | ||
| des.h | ||
| dh.h | ||
| drbg.h | ||
| ecc_curve.h | ||
| ecdh.h | ||
| engine.h | ||
| gcm.h | ||
| gf128mul.h | ||
| ghash.h | ||
| hash_info.h | ||
| hash.h | ||
| hmac.h | ||
| if_alg.h | ||
| kpp.h | ||
| md5.h | ||
| nhpoly1305.h | ||
| null.h | ||
| padlock.h | ||
| pcrypt.h | ||
| pkcs7.h | ||
| poly1305.h | ||
| public_key.h | ||
| rng.h | ||
| scatterwalk.h | ||
| serpent.h | ||
| sha1_base.h | ||
| sha1.h | ||
| sha2.h | ||
| sha3.h | ||
| sha256_base.h | ||
| sha512_base.h | ||
| skcipher.h | ||
| sm2.h | ||
| sm3_base.h | ||
| sm3.h | ||
| sm4.h | ||
| streebog.h | ||
| twofish.h | ||
| xts.h | ||