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musig: mention how keyagg_cache tweak and parity relate to spec

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Also rename internal_key_parity -> parity_acc because the former is
confusing.
This commit is contained in:
Jonas Nick
2022-03-15 22:26:55 +00:00
parent 57eb6b4167
commit eac0df1379
3 changed files with 24 additions and 24 deletions
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6
src/modules/musig/keyagg_impl.h
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@@ -69,7 +69,7 @@ static void secp256k1_keyagg_cache_save(secp256k1_musig_keyagg_cache *cache, sec
ptr += 32;
memcpy(ptr, cache_i->pk_hash, 32);
ptr += 32;
*ptr = cache_i->internal_key_parity;
*ptr = cache_i->parity_acc;
ptr += 1;
secp256k1_scalar_get_b32(ptr, &cache_i->tweak);
}
@@ -84,7 +84,7 @@ static int secp256k1_keyagg_cache_load(const secp256k1_context* ctx, secp256k1_k
ptr += 32;
memcpy(cache_i->pk_hash, ptr, 32);
ptr += 32;
cache_i->internal_key_parity = *ptr & 1;
cache_i->parity_acc = *ptr & 1;
ptr += 1;
secp256k1_scalar_set_b32(&cache_i->tweak, ptr, NULL);
return 1;
@@ -278,7 +278,7 @@ static int secp256k1_musig_pubkey_tweak_add_internal(const secp256k1_context* ct
return 0;
}
if (xonly && secp256k1_extrakeys_ge_even_y(&cache_i.pk)) {
cache_i.internal_key_parity ^= 1;
cache_i.parity_acc ^= 1;
secp256k1_scalar_negate(&cache_i.tweak, &cache_i.tweak);
}
secp256k1_scalar_add(&cache_i.tweak, &cache_i.tweak, &tweak);