Remove deprecated secp256k1_schnorrsig_sign alias

This function has been deprecated since the rename to `_schnorrsig_sign32`
more than three and a half years ago (see PR #1089, commit 99e6568),
before the first official release 0.2.0. Removing it should be fine by now.

Author: theStack

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+#### Removed
+- Removed previously deprecated function alias `secp256k1_schnorrsig_sign`. Use `secp256k1_schnorrsig_sign32` instead.
+
 ## [0.7.0] - 2025-07-21
 
 #### Added

include/secp256k1_schnorrsig.h

@@ -124,20 +124,9 @@ SECP256K1_API int secp256k1_schnorrsig_sign32(
     const unsigned char *aux_rand32
 ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
 
-/** Same as secp256k1_schnorrsig_sign32, but DEPRECATED. Will be removed in
- *  future versions. */
-SECP256K1_API int secp256k1_schnorrsig_sign(
-    const secp256k1_context *ctx,
-    unsigned char *sig64,
-    const unsigned char *msg32,
-    const secp256k1_keypair *keypair,
-    const unsigned char *aux_rand32
-) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4)
-  SECP256K1_DEPRECATED("Use secp256k1_schnorrsig_sign32 instead");
-
 /** Create a Schnorr signature with a more flexible API.
  *
- *  Same arguments as secp256k1_schnorrsig_sign except that it allows signing
+ *  Same arguments as secp256k1_schnorrsig_sign32 except that it allows signing
  *  variable length messages and accepts a pointer to an extraparams object that
  *  allows customizing signing by passing additional arguments.
  *

src/modules/schnorrsig/tests_impl.h

@@ -820,9 +820,6 @@ static void test_schnorrsig_sign_internal(void) {
     CHECK(secp256k1_keypair_xonly_pub(CTX, &pk, NULL, &keypair));
     CHECK(secp256k1_schnorrsig_sign32(CTX, sig, msg, &keypair, NULL) == 1);
     CHECK(secp256k1_schnorrsig_verify(CTX, sig, msg, sizeof(msg), &pk));
-    /* Check that deprecated alias gives the same result */
-    CHECK(secp256k1_schnorrsig_sign(CTX, sig2, msg, &keypair, NULL) == 1);
-    CHECK(secp256k1_memcmp_var(sig, sig2, sizeof(sig)) == 0);
 
     /* Test different nonce functions */
     CHECK(secp256k1_schnorrsig_sign_custom(CTX, sig, msg, sizeof(msg), &keypair, &extraparams) == 1);