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g10/armor: optimize binary to radix64 conversion 

* g10/armor.c (bintoasc): Change to read-only.
(initialize): Use const pointer for 'bintoasc'.
(armor_output_buf_as_radix64): New function for faster binary to
radix64 conversion.
(armor_filter): Use new conversion function.
--

This patch adds faster binary to radix64 conversion to speed up
armored encryption.

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
 encrypt-aead:  2.7          523 MB/s
 encrypt-cfb:   6.7          264 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 e486d4f025
commit e8142cc69a
1 changed files with 125 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

160
g10/armor.c
View File

@ -37,9 +37,9 @@
#define MAX_LINELEN 20000
static byte bintoasc[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
static const byte bintoasc[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
static byte asctobin[256]; /* runtime initialized */
static int is_initialized;
@ -169,7 +169,8 @@ static void
initialize(void)
{
u32 i;
byte *s;
const byte *s;
/* build the helptable for radix64 to bin conversion */
for(i=0; i < 256; i++ )
asctobin[i] = 255; /* used to detect invalid characters */
@ -1003,6 +1004,121 @@ radix64_read( armor_filter_context_t *afx, IOBUF a, size_t *retn,
return rc;
}
static void
armor_output_buf_as_radix64 (armor_filter_context_t *afx, IOBUF a,
byte *buf, size_t size)
{
byte radbuf[sizeof (afx->radbuf)];
byte outbuf[64 + sizeof (afx->eol)];
unsigned int eollen = strlen (afx->eol);
u32 in, in2;
int idx, idx2;
int i;
idx = afx->idx;
idx2 = afx->idx2;
memcpy (radbuf, afx->radbuf, sizeof (afx->radbuf));
if (size && (idx || idx2))
{
/* preload eol to outbuf buffer */
memcpy (outbuf + 4, afx->eol, sizeof (afx->eol));
for (; size && (idx || idx2); buf++, size--)
{
radbuf[idx++] = *buf;
if (idx > 2)
{
idx = 0;
in = (u32)radbuf[0] << (2 * 8);
in |= (u32)radbuf[1] << (1 * 8);
in |= (u32)radbuf[2] << (0 * 8);
outbuf[0] = bintoasc[(in >> 18) & 077];
outbuf[1] = bintoasc[(in >> 12) & 077];
outbuf[2] = bintoasc[(in >> 6) & 077];
outbuf[3] = bintoasc[(in >> 0) & 077];
if (++idx2 >= (64/4))
{ /* pgp doesn't like 72 here */
idx2=0;
iobuf_write (a, outbuf, 4 + eollen);
}
else
{
iobuf_write (a, outbuf, 4);
}
}
}
}
if (size >= (64/4)*3)
{
/* preload eol to outbuf buffer */
memcpy (outbuf + 64, afx->eol, sizeof(afx->eol));
do
{
/* idx and idx2 == 0 */
for (i = 0; i < (64/8); i++)
{
in = (u32)buf[0] << (2 * 8);
in |= (u32)buf[1] << (1 * 8);
in |= (u32)buf[2] << (0 * 8);
in2 = (u32)buf[3] << (2 * 8);
in2 |= (u32)buf[4] << (1 * 8);
in2 |= (u32)buf[5] << (0 * 8);
outbuf[i*8+0] = bintoasc[(in >> 18) & 077];
outbuf[i*8+1] = bintoasc[(in >> 12) & 077];
outbuf[i*8+2] = bintoasc[(in >> 6) & 077];
outbuf[i*8+3] = bintoasc[(in >> 0) & 077];
outbuf[i*8+4] = bintoasc[(in2 >> 18) & 077];
outbuf[i*8+5] = bintoasc[(in2 >> 12) & 077];
outbuf[i*8+6] = bintoasc[(in2 >> 6) & 077];
outbuf[i*8+7] = bintoasc[(in2 >> 0) & 077];
buf+=6;
size-=6;
}
/* pgp doesn't like 72 here */
iobuf_write (a, outbuf, 64 + eollen);
}
while (size >= (64/4)*3);
/* restore eol for tail handling */
if (size)
memcpy (outbuf + 4, afx->eol, sizeof (afx->eol));
}
for (; size; buf++, size--)
{
radbuf[idx++] = *buf;
if (idx > 2)
{
idx = 0;
in = (u32)radbuf[0] << (2 * 8);
in |= (u32)radbuf[1] << (1 * 8);
in |= (u32)radbuf[2] << (0 * 8);
outbuf[0] = bintoasc[(in >> 18) & 077];
outbuf[1] = bintoasc[(in >> 12) & 077];
outbuf[2] = bintoasc[(in >> 6) & 077];
outbuf[3] = bintoasc[(in >> 0) & 077];
if (++idx2 >= (64/4))
{ /* pgp doesn't like 72 here */
idx2=0;
iobuf_write (a, outbuf, 4 + eollen);
}
else
{
iobuf_write (a, outbuf, 4);
}
}
}
memcpy (afx->radbuf, radbuf, sizeof (afx->radbuf));
afx->idx = idx;
afx->idx2 = idx2;
}
/****************
* This filter is used to handle the armor stuff
*/
@ -1012,7 +1128,7 @@ armor_filter( void *opaque, int control,
{
size_t size = *ret_len;
armor_filter_context_t *afx = opaque;
int rc=0, i, c;
int rc=0, c;
byte radbuf[3];
int idx, idx2;
size_t n=0;
@ -1196,37 +1312,11 @@ armor_filter( void *opaque, int control,
afx->idx2 = 0;
gcry_md_reset (afx->crc_md);
}
idx = afx->idx;
idx2 = afx->idx2;
for(i=0; i < idx; i++ )
radbuf[i] = afx->radbuf[i];
if( size )
gcry_md_write (afx->crc_md, buf, size);
for( ; size; buf++, size-- ) {
radbuf[idx++] = *buf;
if( idx > 2 ) {
idx = 0;
c = bintoasc[(*radbuf >> 2) & 077];
iobuf_put(a, c);
c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1] >> 4)&017))&077];
iobuf_put(a, c);
c = bintoasc[(((radbuf[1]<<2)&074)|((radbuf[2]>>6)&03))&077];
iobuf_put(a, c);
c = bintoasc[radbuf[2]&077];
iobuf_put(a, c);
if( ++idx2 >= (64/4) )
{ /* pgp doesn't like 72 here */
iobuf_writestr(a,afx->eol);
idx2=0;
}
}
}
for(i=0; i < idx; i++ )
afx->radbuf[i] = radbuf[i];
afx->idx = idx;
afx->idx2 = idx2;
if( size ) {
gcry_md_write (afx->crc_md, buf, size);
armor_output_buf_as_radix64 (afx, a, buf, size);
}
}
else if( control == IOBUFCTRL_INIT )
{