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Branch-free point addition

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Pieter Wuille
2014-11-11 10:32:50 -08:00
parent ef6f677679
commit 9338dbf791
4 changed files with 230 additions and 5 deletions
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6
src/group.h
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@@ -96,8 +96,12 @@ void static secp256k1_gej_double_var(secp256k1_gej_t *r, const secp256k1_gej_t *
/** Set r equal to the sum of a and b. */
void static secp256k1_gej_add_var(secp256k1_gej_t *r, const secp256k1_gej_t *a, const secp256k1_gej_t *b);
/** Set r equal to the sum of a and b (with b given in affine coordinates, and not infinity). */
void static secp256k1_gej_add_ge(secp256k1_gej_t *r, const secp256k1_gej_t *a, const secp256k1_ge_t *b);
/** Set r equal to the sum of a and b (with b given in affine coordinates). This is more efficient
than secp256k1_gej_add. */
than secp256k1_gej_add_var. It is identical to secp256k1_gej_add_ge but without constant-time
guarantee, and b is allowed to be infinity. */
void static secp256k1_gej_add_ge_var(secp256k1_gej_t *r, const secp256k1_gej_t *a, const secp256k1_ge_t *b);
/** Get a hex representation of a point. *rlen will be overwritten with the real length. */