The patch set replaces the LFSR conditioning function of the Jitter RNG with SHA-3 256. This change requires also a new test interface to analyze the raw unconditioned noise data. Albeit the test interface can be used directly with dd, a small helper tool is provided at [1] which can be used to perform the collection of raw entropy. The analysis of the data can be done with your favorite tool. Or you may use the helper in [2] which uses the NIST SP800-90B tool for entropy rate measurement. [1] https://github.com/smuellerDD/jitterentropy-library/tree/master/tests/raw-entropy/recording_runtime_kernelspace [2] https://github.com/smuellerDD/jitterentropy-library/tree/master/tests/raw-entropy/validation-runtime-kernel Changes v2: - fix use-after-free by switching shash_desc_zero and crypto_free_shash in jent_mod_init reported by kernel-test-robot Stephan Mueller (2): crypto: jitter - replace LFSR with SHA3-256 crypto: jitter - add interface for gathering of raw entropy crypto/Kconfig | 21 +++ crypto/Makefile | 1 + crypto/jitterentropy-kcapi.c | 186 ++++++++++++++++++--- crypto/jitterentropy-testing.c | 294 +++++++++++++++++++++++++++++++++ crypto/jitterentropy.c | 145 ++++++---------- crypto/jitterentropy.h | 20 ++- 6 files changed, 547 insertions(+), 120 deletions(-) create mode 100644 crypto/jitterentropy-testing.c -- 2.40.0
