Hash noncedata into nonce in nonce_function_bipschnorr

Author: jonasnick

src/secp256k1.c

@@ -326,7 +326,6 @@ static SECP256K1_INLINE void buffer_append(unsigned char *buf, unsigned int *off
  * (https://github.com/sipa/bips/blob/bip-schnorr/bip-schnorr.mediawiki) */
 static int secp256k1_nonce_function_bipschnorr(unsigned char *nonce32, const unsigned char *msg32, const unsigned char *key32, const unsigned char *algo16, void *data, unsigned int counter) {
     secp256k1_sha256 sha;
-    (void) data;
     (void) counter;
     VERIFY_CHECK(counter == 0);
 
@@ -339,6 +338,9 @@ static int secp256k1_nonce_function_bipschnorr(unsigned char *nonce32, const uns
     if (algo16 != NULL) {
         secp256k1_sha256_write(&sha, algo16, 16);
     }
+    if (data != NULL) {
+        secp256k1_sha256_write(&sha, data, 32);
+    }
     secp256k1_sha256_finalize(&sha, nonce32);
     return 1;
 }