Remove deprecated _ec_privkey_{negate,tweak_add,tweak_mul} aliases

These function aliases have been described as DEPRECATED in the public
API docs already many years ago (see bitcoin-core#701, commit 41fc785), and in
addition explicit deprecation warnings are shown by the compiler at
least since the first official release 0.2.0 (see PR bitcoin-core#1089, commit
fc94a2d), so it should be fine to just remove them by now.

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+#### Removed
+- The previously deprecated function aliases `secp256k1_ec_privkey_negate`, `secp256k1_ec_tweak_add` and
+  `secp256k1_ec_privkey_tweak_mul` were removed. The corresponding replacements `secp256k1_ec_seckey_negate`,
+  `secp256k1_ec_seckey_tweak_add` and `secp256k1_ec_seckey_tweak_mul` must be used instead.
+
 ## [0.5.1] - 2024-08-01
 
 #### Added

include/secp256k1.h

@@ -725,14 +725,6 @@ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_negate(
     unsigned char *seckey
 ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
 
-/** Same as secp256k1_ec_seckey_negate, but DEPRECATED. Will be removed in
- *  future versions. */
-SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_negate(
-    const secp256k1_context *ctx,
-    unsigned char *seckey
-) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2)
-  SECP256K1_DEPRECATED("Use secp256k1_ec_seckey_negate instead");
-
 /** Negates a public key in place.
  *
  *  Returns: 1 always
@@ -765,15 +757,6 @@ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_tweak_add(
     const unsigned char *tweak32
 ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
 
-/** Same as secp256k1_ec_seckey_tweak_add, but DEPRECATED. Will be removed in
- *  future versions. */
-SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_tweak_add(
-    const secp256k1_context *ctx,
-    unsigned char *seckey,
-    const unsigned char *tweak32
-) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3)
-  SECP256K1_DEPRECATED("Use secp256k1_ec_seckey_tweak_add instead");
-
 /** Tweak a public key by adding tweak times the generator to it.
  *
  *  Returns: 0 if the arguments are invalid or the resulting public key would be
@@ -812,15 +795,6 @@ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_tweak_mul(
     const unsigned char *tweak32
 ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
 
-/** Same as secp256k1_ec_seckey_tweak_mul, but DEPRECATED. Will be removed in
- *  future versions. */
-SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_tweak_mul(
-    const secp256k1_context *ctx,
-    unsigned char *seckey,
-    const unsigned char *tweak32
-) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3)
-  SECP256K1_DEPRECATED("Use secp256k1_ec_seckey_tweak_mul instead");
-
 /** Tweak a public key by multiplying it by a tweak value.
  *
  *  Returns: 0 if the arguments are invalid. 1 otherwise.

src/secp256k1.c

@@ -643,10 +643,6 @@ int secp256k1_ec_seckey_negate(const secp256k1_context* ctx, unsigned char *seck
     return ret;
 }
 
-int secp256k1_ec_privkey_negate(const secp256k1_context* ctx, unsigned char *seckey) {
-    return secp256k1_ec_seckey_negate(ctx, seckey);
-}
-
 int secp256k1_ec_pubkey_negate(const secp256k1_context* ctx, secp256k1_pubkey *pubkey) {
     int ret = 0;
     secp256k1_ge p;
@@ -690,10 +686,6 @@ int secp256k1_ec_seckey_tweak_add(const secp256k1_context* ctx, unsigned char *s
     return ret;
 }
 
-int secp256k1_ec_privkey_tweak_add(const secp256k1_context* ctx, unsigned char *seckey, const unsigned char *tweak32) {
-    return secp256k1_ec_seckey_tweak_add(ctx, seckey, tweak32);
-}
-
 static int secp256k1_ec_pubkey_tweak_add_helper(secp256k1_ge *p, const unsigned char *tweak32) {
     secp256k1_scalar term;
     int overflow = 0;
@@ -738,10 +730,6 @@ int secp256k1_ec_seckey_tweak_mul(const secp256k1_context* ctx, unsigned char *s
     return ret;
 }
 
-int secp256k1_ec_privkey_tweak_mul(const secp256k1_context* ctx, unsigned char *seckey, const unsigned char *tweak32) {
-    return secp256k1_ec_seckey_tweak_mul(ctx, seckey, tweak32);
-}
-
 int secp256k1_ec_pubkey_tweak_mul(const secp256k1_context* ctx, secp256k1_pubkey *pubkey, const unsigned char *tweak32) {
     secp256k1_ge p;
     secp256k1_scalar factor;

src/tests.c

@@ -6220,11 +6220,6 @@ static void run_eckey_negate_test(void) {
     CHECK(secp256k1_ec_seckey_negate(CTX, seckey) == 1);
     CHECK(secp256k1_memcmp_var(seckey, seckey_tmp, 32) == 0);
 
-    /* Check that privkey alias gives same result */
-    CHECK(secp256k1_ec_seckey_negate(CTX, seckey) == 1);
-    CHECK(secp256k1_ec_privkey_negate(CTX, seckey_tmp) == 1);
-    CHECK(secp256k1_memcmp_var(seckey, seckey_tmp, 32) == 0);
-
     /* Negating all 0s fails */
     memset(seckey, 0, 32);
     memset(seckey_tmp, 0, 32);
@@ -6385,22 +6380,15 @@ static void test_ecdsa_end_to_end(void) {
     if (testrand_int(3) == 0) {
         int ret1;
         int ret2;
-        int ret3;
         unsigned char rnd[32];
-        unsigned char privkey_tmp[32];
         secp256k1_pubkey pubkey2;
         testrand256_test(rnd);
-        memcpy(privkey_tmp, privkey, 32);
         ret1 = secp256k1_ec_seckey_tweak_add(CTX, privkey, rnd);
         ret2 = secp256k1_ec_pubkey_tweak_add(CTX, &pubkey, rnd);
-        /* Check that privkey alias gives same result */
-        ret3 = secp256k1_ec_privkey_tweak_add(CTX, privkey_tmp, rnd);
         CHECK(ret1 == ret2);
-        CHECK(ret2 == ret3);
         if (ret1 == 0) {
             return;
         }
-        CHECK(secp256k1_memcmp_var(privkey, privkey_tmp, 32) == 0);
         CHECK(secp256k1_ec_pubkey_create(CTX, &pubkey2, privkey) == 1);
         CHECK(secp256k1_memcmp_var(&pubkey, &pubkey2, sizeof(pubkey)) == 0);
     }
@@ -6409,22 +6397,15 @@ static void test_ecdsa_end_to_end(void) {
     if (testrand_int(3) == 0) {
         int ret1;
         int ret2;
-        int ret3;
         unsigned char rnd[32];
-        unsigned char privkey_tmp[32];
         secp256k1_pubkey pubkey2;
         testrand256_test(rnd);
-        memcpy(privkey_tmp, privkey, 32);
         ret1 = secp256k1_ec_seckey_tweak_mul(CTX, privkey, rnd);
         ret2 = secp256k1_ec_pubkey_tweak_mul(CTX, &pubkey, rnd);
-        /* Check that privkey alias gives same result */
-        ret3 = secp256k1_ec_privkey_tweak_mul(CTX, privkey_tmp, rnd);
         CHECK(ret1 == ret2);
-        CHECK(ret2 == ret3);
         if (ret1 == 0) {
             return;
         }
-        CHECK(secp256k1_memcmp_var(privkey, privkey_tmp, 32) == 0);
         CHECK(secp256k1_ec_pubkey_create(CTX, &pubkey2, privkey) == 1);
         CHECK(secp256k1_memcmp_var(&pubkey, &pubkey2, sizeof(pubkey)) == 0);
     }