Module Name: src Committed By: riastradh Date: Mon Dec 9 04:51:04 UTC 2019
Modified Files: src/sys/arch/arm/sunxi: files.sunxi src/sys/arch/evbarm/conf: GENERIC64 Added Files: src/sys/arch/arm/sunxi: sun8i_crypto.c sun8i_crypto.h Log Message: Draft driver for Allwinner Crypto Engine. Found on, e.g., the Pinebook. Only used for TRNG at the moment, but hooking it up to opencrypto(9) shouldn't be too hard if anyone still cares about that these days. The distribution of the alleged TRNG is very nonuniform distributed seems to alternate between toward runs with exceptionally high fractions of 0 bits and runs with exceptionally high fractions of 1 bits -- initially all my samples were mostly 0's, and then all my samples were mostly 1's, and now I'm seeing more oscillation between these runs. So I've wired it up as RND_TYPE_UNKNOWN, not RND_TYPE_RNG (it will immediately flunk our rngtest and be disabled), and I estimated it to provide at most one bit of entropy per byte of data -- which may still be optimistic. I also added a sysctl node hw.sun8icryptoN.rng to read out 1024-byte samples for analysis, and I left the driver commented out in GENERIC64 for now. (If anyone has contacts at Allwinner who can tell us about how the alleged TRNG is supposed to work, please let me know!) To generate a diff of this commit: cvs rdiff -u -r1.66 -r1.67 src/sys/arch/arm/sunxi/files.sunxi cvs rdiff -u -r0 -r1.1 src/sys/arch/arm/sunxi/sun8i_crypto.c \ src/sys/arch/arm/sunxi/sun8i_crypto.h cvs rdiff -u -r1.115 -r1.116 src/sys/arch/evbarm/conf/GENERIC64 Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.