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g10/armor: use libgcrypt's CRC24 implementation

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* g10/armor.c (CRCINIT, CRCPOLY, CRCUPDATE, crc_table): Remove.
(new_armor_context): Open libgcrypt CRC24 context.
(release_armor_context): Close CRC24 context.
(initialize): Remove CRC table generation.
(get_afx_crc): New.
(check_input, fake_packet, radix64_read, armor_filter): Update to use
CRC24 context.
* g10/filter.h (armor_filter_context_t): Replace crc intermediate value
with libgcrypt md context pointer.
--

This patch changes armor filter to use optimized CRC24 implementation
from libgcrypt to speed up encryption and 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 opt)
-----------------------------
               gpg process
armor:         user time    pipe transfer rate
 encrypt-aead:  8.7          211 MB/s
 decrypt-aead:  17.6         116 MB/s
 encrypt-cfb:   12.6         153 MB/s
 decrypt-cfb:   19.6         105 MB/s

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
This commit is contained in:
Jussi Kivilinna 2018-11-08 21:31:12 +02:00
parent 2b5718c1f7
commit e486d4f025
2 changed files with 51 additions and 48 deletions
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2
g10/filter.h
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@ -61,7 +61,7 @@ typedef struct {
byte radbuf[4];
int idx, idx2;
u32 crc;
gcry_md_hd_t crc_md;
int status; /* an internal state flag */
int cancel;