g10/armor: optimize radix64 to binary conversion
authorJussi Kivilinna <jussi.kivilinna@iki.fi>
Thu, 8 Nov 2018 19:31:12 +0000 (21:31 +0200)
committerJussi Kivilinna <jussi.kivilinna@iki.fi>
Thu, 8 Nov 2018 19:31:12 +0000 (21:31 +0200)
commit643ec7c642dc75191e712963d2bb460ac247e09b
treea2d8c265d268b8d3329de4ecd3152563a70ef052
parente8142cc69a2ae5a5d0a238bc9f88841067359af8
g10/armor: optimize radix64 to binary conversion

* g10/armor.c (asctobin): Larger look-up table for fast path.
(initialize): Update 'asctobin' initialization.
(radix64_read): Add fast path for radix64 to binary conversion.
--

This patch adds fast path for radix64 to binary conversion in
armored decryption.

Benchmark results below, tested on Intel Core i7-4790K (turbo off).
Encrypted 2 GiB through pipe to ramfs file using AES128. Decrypt
ramfs file out through pipe to /dev/null.

before patch-set
----------------
               gpg process
armor:         user time    pipe transfer rate
 encrypt-aead:  13.8         140 MB/s
 decrypt-aead:  30.6         68 MB/s
 encrypt-cfb:   17.4         114 MB/s
 decrypt-cfb:   32.6         64 MB/s

after (decrypt+iobuf+crc+radix64 opt)
-------------------------------------
               gpg process
armor:         user time    pipe transfer rate
 decrypt-aead:  9.8          200 MB/s
 decrypt-cfb:   11.9         168 MB/s

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
g10/armor.c