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authorNikolay Borisov <nborisov@suse.com>2019-05-30 09:52:57 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2019-06-06 14:38:57 +0800
commit67882e76492483bafa9b1b1648bb031e9abe5185 (patch)
tree0b591220f61262266ce22060f34757543d104f42 /crypto/Kconfig
parentd9d67c87ad37218be65f4cea3ecd7e0312735e78 (diff)
downloadlinux-67882e76492483bafa9b1b1648bb031e9abe5185.tar.bz2
crypto: xxhash - Implement xxhash support
xxhash is currently implemented as a self-contained module in /lib. This patch enables that module to be used as part of the generic kernel crypto framework. It adds a simple wrapper to the 64bit version. I've also added test vectors (with help from Nick Terrell). The upstream xxhash code is tested by running hashing operation on random 222 byte data with seed values of 0 and a prime number. The upstream test suite can be found at https://github.com/Cyan4973/xxHash/blob/cf46e0c/xxhsum.c#L664 Essentially hashing is run on data of length 0,1,14,222 with the aforementioned seed values 0 and prime 2654435761. The particular random 222 byte string was provided to me by Nick Terrell by reading /dev/random and the checksums were calculated by the upstream xxsum utility with the following bash script: dd if=/dev/random of=TEST_VECTOR bs=1 count=222 for a in 0 1; do for l in 0 1 14 222; do for s in 0 2654435761; do echo algo $a length $l seed $s; head -c $l TEST_VECTOR | ~/projects/kernel/xxHash/xxhsum -H$a -s$s done done done This produces output as follows: algo 0 length 0 seed 0 02cc5d05 stdin algo 0 length 0 seed 2654435761 02cc5d05 stdin algo 0 length 1 seed 0 25201171 stdin algo 0 length 1 seed 2654435761 25201171 stdin algo 0 length 14 seed 0 c1d95975 stdin algo 0 length 14 seed 2654435761 c1d95975 stdin algo 0 length 222 seed 0 b38662a6 stdin algo 0 length 222 seed 2654435761 b38662a6 stdin algo 1 length 0 seed 0 ef46db3751d8e999 stdin algo 1 length 0 seed 2654435761 ac75fda2929b17ef stdin algo 1 length 1 seed 0 27c3f04c2881203a stdin algo 1 length 1 seed 2654435761 4a15ed26415dfe4d stdin algo 1 length 14 seed 0 3d33dc700231dfad stdin algo 1 length 14 seed 2654435761 ea5f7ddef9a64f80 stdin algo 1 length 222 seed 0 5f3d3c08ec2bef34 stdin algo 1 length 222 seed 2654435761 6a9df59664c7ed62 stdin algo 1 is xx64 variant, algo 0 is the 32 bit variant which is currently not hooked up. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Eric Biggers <ebiggers@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/Kconfig')
-rw-r--r--crypto/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 9cdd92520f00..8c588ed36253 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -683,6 +683,14 @@ config CRYPTO_CRC32_MIPS
instructions, when available.
+config CRYPTO_XXHASH
+ tristate "xxHash hash algorithm"
+ select CRYPTO_HASH
+ select XXHASH
+ help
+ xxHash non-cryptographic hash algorithm. Extremely fast, working at
+ speeds close to RAM limits.
+
config CRYPTO_CRCT10DIF
tristate "CRCT10DIF algorithm"
select CRYPTO_HASH