[PATCH v2 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:

  algos='md5sum sha1sum sha224sum sha256sum sha384sum sha512sum'

  for alg in $algos; do
      echo -n "Checking $alg..."
      for bs in 1 31 512 1K 4K 1M; do
        for count in 0 1 1234 4096; do
            hash1=$(dd status=none if=/dev/zero bs=$bs count=$count |$alg)
            hash2=$(dd status=none if=/dev/zero bs=$bs count=$count |src/$alg)
            [ "$hash1" = "$hash2" ] || exit 1
        done
      done
      echo " ok"
  done

Changes from v2:
* add copyright nore in af_alg.c
* check for AF_ALG in sys/socket.h to avoid build failures when unavailable
* don't include unneeded header files in af_alg.h
* revert wrong Include directive in module description
* revert unneeded 'Hey Emacs!' blocks
* use correct GNU indentation
* prefer size_t over int to denote memory segments
* avoid possible overflow by checking arguments size
* return -EIO if sendfile() returns a short read/write count
* fix a file descriptor leak when bind() returns error

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          | 124 ++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/af_alg.h          |  51 +++++++++++++++++++++
 lib/md5.c             |  20 +++++++-
 lib/sha1.c            |  19 +++++++-
 lib/sha256.c          |  34 +++++++++++++-
 lib/sha512.c          |  34 +++++++++++++-
 modules/crypto/md5    |   4 +-
 modules/crypto/sha1   |   4 +-
 modules/crypto/sha256 |   4 +-
 modules/crypto/sha512 |   4 +-
 10 files changed, 288 insertions(+), 10 deletions(-)
 create mode 100644 lib/af_alg.c
 create mode 100644 lib/af_alg.h

-- 
2.14.3