Hi, The following patch set provides a different approach to /dev/random which I call Linux Random Number Generator (LRNG) to collect entropy within the Linux kernel. The main improvements compared to the legacy /dev/random is to provide sufficient entropy during boot time as well as in virtual environments and when using SSDs. A secondary design goal is to limit the impact of the entropy collection on massive parallel systems and also allow the use accelerated cryptographic primitives. Also, all steps of the entropic data processing are testable. Finally massive performance improvements are visible at /dev/urandom and get_random_bytes. The design and implementation is driven by a set of goals described in [1] that the LRNG completely implements. Furthermore, [1] includes a comparison with RNG design suggestions such as SP800-90B, SP800-90C, and AIS20/31. The LRNG has a flexible design by allowing an easy replacement of the deterministic random number generator component. Currently implemented DRNGs are an SP800-90A DRBG and a ChaCha20 DRNG. [1] http://www.chronox.de/lrng.html Changes v11 (compared to v9): * port to 4.12-rc1 * contintionally compile JitterRNG code depending on CONFIG_CRYPTO_JITTERENTROPY * update error code path when lrng_hash_buffer fails to report the successfully read entropy * remove LRNG_DRBG_BLOCKLEN_BYTES in favor of LRNG_DRBG_BLOCKSIZE * add get_random_u64 and get_random_u32 from legacy /dev/random to prevent any modifications of random.c * move LRNG to drivers/char/ * wakeup user space writers only when entropy in pool is low (not when primary DRBG entropy is low) * LFSR alteration to space the processed words 67 words apart to counter polynomial taps that are close together which may be affected by dependencies * Always mix in an interrupt time stamp even when considered stuck, just do not increment number of collected interrupts used to determine the entropy content Stephan Mueller (5): crypto: DRBG - externalize DRBG functions for LRNG random: conditionally compile code depending on LRNG Linux Random Number Generator LRNG - enable compile LRNG - add ChaCha20 support crypto/drbg.c | 11 +- drivers/char/Kconfig | 9 + drivers/char/Makefile | 15 +- drivers/char/lrng_base.c | 2283 ++++++++++++++++++++++++++++++++++++++++ drivers/char/lrng_kcapi.c | 173 +++ drivers/char/lrng_standalone.c | 325 ++++++ include/crypto/drbg.h | 7 + include/linux/genhd.h | 5 + 8 files changed, 2821 insertions(+), 7 deletions(-) create mode 100644 drivers/char/lrng_base.c create mode 100644 drivers/char/lrng_kcapi.c create mode 100644 drivers/char/lrng_standalone.c -- 2.9.3
