Eric Lee / smarc-fsl-linux-kernel

06 Jun, 2019

1 commit

  • 67882e764   crypto: xxhash - Implement xxhash support ... Browse Code ยป

    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
    Reviewed-by: Eric Biggers
    Signed-off-by: Herbert Xu

    Nikolay Borisov