mirror of
https://github.com/urbit/shrub.git
synced 2024-12-22 10:21:31 +03:00
20 lines
382 B
C
20 lines
382 B
C
|
#include "urcrypt.h"
|
||
|
|
|
||
|
|
int
|
||
|
|
urcrypt_ed_scalarmult(uint8_t a[32], uint8_t b[32], uint8_t out[32])
|
||
|
|
{
|
||
|
|
ge_p3 B, result;
|
||
|
|
|
||
|
|
if ( ge_frombytes_negate_vartime(&B, b) != 0 ) {
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Undo the negation from above. See add_scalar.c in the ed25519 distro.
|
||
|
|
fe_neg(B.X, B.X);
|
||
|
|
fe_neg(B.T, B.T);
|
||
|
|
|
||
|
|
ge_scalarmult(&result, a, &B);
|
||
|
|
ge_p3_tobytes(out, &result);
|
||
|
|
return 0;
|
||
|
|
}
|