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musig: allow ordinary, non-xonly tweaking

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This commit is contained in:
Jonas Nick
2021-10-25 21:50:08 +00:00
parent c519b46879
commit 37107361a0
4 changed files with 169 additions and 90 deletions
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12
src/modules/musig/keyagg_impl.h
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@@ -258,7 +258,7 @@ int secp256k1_musig_pubkey_get(const secp256k1_context* ctx, secp256k1_pubkey *a
return 1;
}
int secp256k1_musig_pubkey_tweak_add(const secp256k1_context* ctx, secp256k1_pubkey *output_pubkey, secp256k1_musig_keyagg_cache *keyagg_cache, const unsigned char *tweak32) {
static int secp256k1_musig_pubkey_tweak_add_internal(const secp256k1_context* ctx, secp256k1_pubkey *output_pubkey, secp256k1_musig_keyagg_cache *keyagg_cache, const unsigned char *tweak32, int xonly) {
secp256k1_keyagg_cache_internal cache_i;
int overflow = 0;
secp256k1_scalar tweak;
@@ -277,7 +277,7 @@ int secp256k1_musig_pubkey_tweak_add(const secp256k1_context* ctx, secp256k1_pub
if (overflow) {
return 0;
}
if (secp256k1_extrakeys_ge_even_y(&cache_i.pk)) {
if (xonly && secp256k1_extrakeys_ge_even_y(&cache_i.pk)) {
cache_i.internal_key_parity ^= 1;
secp256k1_scalar_negate(&cache_i.tweak, &cache_i.tweak);
}
@@ -294,4 +294,12 @@ int secp256k1_musig_pubkey_tweak_add(const secp256k1_context* ctx, secp256k1_pub
return 1;
}
int secp256k1_musig_pubkey_ec_tweak_add(const secp256k1_context* ctx, secp256k1_pubkey *output_pubkey, secp256k1_musig_keyagg_cache *keyagg_cache, const unsigned char *tweak32) {
return secp256k1_musig_pubkey_tweak_add_internal(ctx, output_pubkey, keyagg_cache, tweak32, 0);
}
int secp256k1_musig_pubkey_xonly_tweak_add(const secp256k1_context* ctx, secp256k1_pubkey *output_pubkey, secp256k1_musig_keyagg_cache *keyagg_cache, const unsigned char *tweak32) {
return secp256k1_musig_pubkey_tweak_add_internal(ctx, output_pubkey, keyagg_cache, tweak32, 1);
}
#endif