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 <[email protected]>

0 files changed, 0 insertions, 0 deletions