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secp256k1
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Make secp256k1_ge_set_gej work with the point at infinity

This commit is contained in:
Pieter Wuille 2014-09-13 00:46:32 +02:00
parent f023dc53c4
commit 1136bedbc2
1 changed files with 4 additions and 1 deletions
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5
src/group_impl.h
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@ -55,13 +55,16 @@ void static secp256k1_ge_get_hex(char *r, int *rlen, const secp256k1_ge_t *a) {
}
void static secp256k1_ge_set_gej(secp256k1_ge_t *r, secp256k1_gej_t *a) {
r->infinity = a->infinity;
if (a->infinity) {
return;
}
secp256k1_fe_inv_var(&a->z, &a->z);
secp256k1_fe_t z2; secp256k1_fe_sqr(&z2, &a->z);
secp256k1_fe_t z3; secp256k1_fe_mul(&z3, &a->z, &z2);
secp256k1_fe_mul(&a->x, &a->x, &z2);
secp256k1_fe_mul(&a->y, &a->y, &z3);
secp256k1_fe_set_int(&a->z, 1);
r->infinity = a->infinity;
r->x = a->x;
r->y = a->y;
}