emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

tls: speed up xor'ing of aligned 16-byte buffers

Browse Source 
function                                             old     new   delta
xorbuf_aligned_AES_BLOCK_SIZE                          -      23     +23
xwrite_encrypted                                     585     580      -5
aesgcm_GHASH                                         233     228      -5
GMULT                                                192     187      -5
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/3 up/down: 23/-15)              Total: 8 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2018-11-24 14:08:29 +01:00
parent 941440cf16
commit 03569bc50f
3 changed files with 36 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
networking/tls_aesgcm.c
View File

@@ -50,8 +50,8 @@ static void RIGHTSHIFTX(byte* x)
static void GMULT(byte* X, byte* Y)
{
byte Z[AES_BLOCK_SIZE];
byte V[AES_BLOCK_SIZE];
byte Z[AES_BLOCK_SIZE] ALIGNED_long;
byte V[AES_BLOCK_SIZE] ALIGNED_long;
int i, j;
XMEMSET(Z, 0, AES_BLOCK_SIZE);
@@ -62,7 +62,7 @@ static void GMULT(byte* X, byte* Y)
for (j = 0; j < 8; j++)
{
if (y & 0x80) {
xorbuf(Z, V, AES_BLOCK_SIZE);
xorbuf_aligned_AES_BLOCK_SIZE(Z, V);
}
RIGHTSHIFTX(V);
@@ -86,8 +86,8 @@ void FAST_FUNC aesgcm_GHASH(byte* h,
byte* s //, unsigned sSz
)
{
byte x[AES_BLOCK_SIZE] ALIGNED(4);
byte scratch[AES_BLOCK_SIZE] ALIGNED(4);
byte x[AES_BLOCK_SIZE] ALIGNED_long;
byte scratch[AES_BLOCK_SIZE] ALIGNED_long;
word32 blocks, partial;
//was: byte* h = aes->H;
@@ -116,6 +116,7 @@ void FAST_FUNC aesgcm_GHASH(byte* h,
blocks = cSz / AES_BLOCK_SIZE;
partial = cSz % AES_BLOCK_SIZE;
while (blocks--) {
//xorbuf_aligned_AES_BLOCK_SIZE(x, c); - c is not guaranteed to be aligned
xorbuf(x, c, AES_BLOCK_SIZE);
GMULT(x, h);
c += AES_BLOCK_SIZE;
@@ -124,7 +125,7 @@ void FAST_FUNC aesgcm_GHASH(byte* h,
//XMEMSET(scratch, 0, AES_BLOCK_SIZE);
//XMEMCPY(scratch, c, partial);
//xorbuf(x, scratch, AES_BLOCK_SIZE);
xorbuf(x, c, partial);
xorbuf(x, c, partial);//same result as above
GMULT(x, h);
}
}
@@ -132,7 +133,7 @@ void FAST_FUNC aesgcm_GHASH(byte* h,
/* Hash in the lengths of A and C in bits */
FlattenSzInBits(&scratch[0], aSz);
FlattenSzInBits(&scratch[8], cSz);
xorbuf(x, scratch, AES_BLOCK_SIZE);
xorbuf_aligned_AES_BLOCK_SIZE(x, scratch);
GMULT(x, h);
/* Copy the result into s. */