frost/secp256k1-zkp
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generator: speed up parsing

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Similar to speeding up serialization; in our parsing logic we did a
bunch of expensive stuff then expensively inverted it. Drop everything
except the essential checks and then memcpy.
This commit is contained in:
Andrew Poelstra 2024-05-16 14:10:52 +00:00
parent 5e7c2c178d
commit 6361266013
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GPG Key ID: C588D63CE41B97C1
1 changed files with 3 additions and 6 deletions
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9
src/modules/generator/main_impl.h
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@ -276,7 +276,6 @@ static void secp256k1_pedersen_commitment_save(secp256k1_pedersen_commitment* co
int secp256k1_pedersen_commitment_parse(const secp256k1_context* ctx, secp256k1_pedersen_commitment* commit, const unsigned char *input) {
secp256k1_fe x;
secp256k1_ge ge;
VERIFY_CHECK(ctx != NULL);
ARG_CHECK(commit != NULL);
@ -285,13 +284,11 @@ int secp256k1_pedersen_commitment_parse(const secp256k1_context* ctx, secp256k1_
if ((input[0] & 0xFE) != 8 ||
!secp256k1_fe_set_b32_limit(&x, &input[1]) ||
!secp256k1_ge_set_xquad(&ge, &x)) {
!secp256k1_ge_x_on_curve_var(&x)) {
return 0;
}
if (input[0] & 1) {
secp256k1_ge_neg(&ge, &ge);
}
secp256k1_pedersen_commitment_save(commit, &ge);
memcpy(commit->data, input, 33);
return 1;
}