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Improved GHASH pclmul implementation (parallel processing of four blocks, +70% speed).
[BearSSL]
/
src
/
int
/
i31_montmul.c
diff --git
a/src/int/i31_montmul.c
b/src/int/i31_montmul.c
index
0857797
..
b953aa3
100644
(file)
--- a/
src/int/i31_montmul.c
+++ b/
src/int/i31_montmul.c
@@
-41,7
+41,7
@@
br_i31_montymul(uint32_t *d, const uint32_t *x, const uint32_t *y,
uint64_t r, zh;
xu = x[u + 1];
- f =
((d[1] + x[u + 1] * y[1]) * m0i) & 0x7FFFFFFF
;
+ f =
MUL31_lo((d[1] + MUL31_lo(x[u + 1], y[1])), m0i)
;
r = 0;
for (v = 0; v < len4; v += 4) {