[PATCH 0/4] Use AF_ALG in checksum utilities

[Matteo Croce]

Let md5sum and all sha*sum utilities use Linux kernel cryptographic API via the
AF_ALG address family.

Speed gain depends on the CPU type:

Xeon E3-1265L V2:

    $ truncate -s 2GB 2g.bin
    $ time sha1sum 2g.bin
    752ef2367f479e79e4f0cded9c270c2890506ab0  2g.bin

    real    0m4.829s
    user    0m4.437s
    sys     0m0.391s
    $ time ./sha1sum-afalg 2g.bin
    752ef2367f479e79e4f0cded9c270c2890506ab0  2g.bin

    real    0m3.164s
    user    0m0.000s
    sys     0m3.162s

Xeon E3-1240 v6:

    $ time sha1sum disk.qcow2
    47be301f86c71c20eae4ccc5bab4c02e09e729a4  disk.qcow2

    real  0m28.390s
    user  0m13.352s
    sys  0m1.376s
    $ time ./sha1sum-afalg disk.qcow2
    47be301f86c71c20eae4ccc5bab4c02e09e729a4  disk.qcow2

    real  0m8.373s
    user  0m0.052s
    sys  0m8.308s

Marvell Armada 8040 - MACCHIATOBin Dual shot:

    $ dd if=/dev/zero bs=1G count=10 |time -p sha1sum
    a0b6e2ca4e28360a929943e8eb966f703a69dc44  2g.bin

    real  0m49.390s
    user  0m46.852s
    sys  0m2.076s
    $ dd if=/dev/zero bs=1G count=10 |time -p ./sha1sum-afalg
    a0b6e2ca4e28360a929943e8eb966f703a69dc44  2g.bin

    real  0m15.104s
    user  0m0.052s
    sys  0m15.008s

Correctness of the implementation was tested with the following script:

    for alg in md5sum sha1sum sha224sum sha256sum sha384sum sha512sum; do
        for len in 0 1 1234 4000222; do
            hash1=$(dd status=none if=/dev/zero bs=1 count=$len |$alg)
            hash2=$(dd status=none if=/dev/zero bs=1 count=$len |src/$alg)
            [ "$hash1" = "$hash2" ] || exec echo "$alg: hash differs with data 
length $len!"
        done
    done


Matteo Croce (4):
  sha1sum: use AF_ALG when available
  sha256sum: use kernel crypto API
  sha512sum: use kernel crypto API
  md5sum: use kernel crypto API

 lib/af_alg.c          | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/af_alg.h          |  46 +++++++++++++++++++++++
 lib/md5.c             |  14 ++++++-
 lib/sha1.c            |  13 ++++++-
 lib/sha256.c          |  26 ++++++++++++-
 lib/sha512.c          |  26 ++++++++++++-
 modules/crypto/md5    |   5 ++-
 modules/crypto/sha1   |   5 ++-
 modules/crypto/sha256 |   5 ++-
 modules/crypto/sha512 |   5 ++-
 10 files changed, 237 insertions(+), 10 deletions(-)
 create mode 100644 lib/af_alg.c
 create mode 100644 lib/af_alg.h

-- 
2.14.3