musig: move ge_{serialize,parse}_ext to module-independent file

src/modules/musig/session_impl.h

@@ -200,32 +200,6 @@ int secp256k1_musig_pubnonce_parse(const secp256k1_context* ctx, secp256k1_musig
  return 1;
 }
 
-/* Outputs 33 zero bytes if the given group element is the point at infinity and
- * otherwise outputs the compressed serialization */
-static void secp256k1_ge_serialize_ext(unsigned char *out33, secp256k1_ge* ge) {
- if (secp256k1_ge_is_infinity(ge)) {
- memset(out33, 0, 33);
- } else {
- int ret;
- size_t size = 33;
- ret = secp256k1_eckey_pubkey_serialize(ge, out33, &size, 1);
- /* Serialize must succeed because the point is not at infinity */
- VERIFY_CHECK(ret && size == 33);
- }
-}
-
-/* Outputs the point at infinity if the given byte array is all zero, otherwise
- * attempts to parse compressed point serialization. */
-static int secp256k1_ge_parse_ext(secp256k1_ge* ge, const unsigned char *in33) {
- unsigned char zeros[33] = { 0 };
-
- if (memcmp(in33, zeros, sizeof(zeros)) == 0) {
- secp256k1_ge_set_infinity(ge);
- return 1;
- }
- return secp256k1_eckey_pubkey_parse(ge, in33, 33);
-}
-
 int secp256k1_musig_aggnonce_serialize(const secp256k1_context* ctx, unsigned char *out66, const secp256k1_musig_aggnonce* nonce) {
  secp256k1_ge ge[2];
  int i;

src/secp256k1.c

@@ -800,6 +800,32 @@ int secp256k1_tagged_sha256(const secp256k1_context* ctx, unsigned char *hash32,
  return 1;
 }
 
+/* Outputs 33 zero bytes if the given group element is the point at infinity and
+ * otherwise outputs the compressed serialization */
+static void secp256k1_ge_serialize_ext(unsigned char *out33, secp256k1_ge* ge) {
+ if (secp256k1_ge_is_infinity(ge)) {
+ memset(out33, 0, 33);
+ } else {
+ int ret;
+ size_t size = 33;
+ ret = secp256k1_eckey_pubkey_serialize(ge, out33, &size, 1);
+ /* Serialize must succeed because the point is not at infinity */
+ VERIFY_CHECK(ret && size == 33);
+ }
+}
+
+/* Outputs the point at infinity if the given byte array is all zero, otherwise
+ * attempts to parse compressed point serialization. */
+static int secp256k1_ge_parse_ext(secp256k1_ge* ge, const unsigned char *in33) {
+ unsigned char zeros[33] = { 0 };
+
+ if (memcmp(in33, zeros, sizeof(zeros)) == 0) {
+ secp256k1_ge_set_infinity(ge);
+ return 1;
+ }
+ return secp256k1_eckey_pubkey_parse(ge, in33, 33);
+}
+
 #ifdef ENABLE_MODULE_BPPP
 # include "modules/bppp/main_impl.h"
 #endif