fix incorrect FFI binding for pubkey_combine

Author: apoelstra

Cargo-minimal.lock

@@ -273,7 +273,7 @@ dependencies = [
 
 [[package]]
 name = "secp256k1-sys"
-version = "0.9.1"
+version = "0.9.2"
 dependencies = [
  "cc",
  "libc",

Cargo-recent.lock

@@ -194,7 +194,7 @@ dependencies = [
 
 [[package]]
 name = "secp256k1-sys"
-version = "0.9.1"
+version = "0.9.2"
 dependencies = [
  "cc",
  "libc",

secp256k1-sys/CHANGELOG.md

@@ -1,3 +1,7 @@
+# 0.9.2 - 2023-12-18
+
+* Fix incorrect FFI binding for `secp256k1_pubkey_combine`
+
 # 0.9.1 - 2023-12-07
 
 * Patch out any instances of printf in upstream [#663](https://github.com/rust-bitcoin/rust-secp256k1/pull/663)

secp256k1-sys/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "secp256k1-sys"
-version = "0.9.1"
+version = "0.9.2"
 authors = [ "Dawid Ciężarkiewicz <dpc@ucore.info>",
             "Andrew Poelstra <apoelstra@wpsoftware.net>",
             "Steven Roose <steven@stevenroose.org>" ]

secp256k1-sys/src/lib.rs

@@ -724,7 +724,7 @@ extern "C" {
     pub fn secp256k1_ec_pubkey_combine(cx: *const Context,
                                        out: *mut PublicKey,
                                        ins: *const *const PublicKey,
-                                       n: c_int)
+                                       n: size_t)
                                        -> c_int;
 
     #[cfg_attr(not(rust_secp_no_symbol_renaming), link_name = "rustsecp256k1_v0_9_1_ecdh")]
@@ -1306,7 +1306,7 @@ mod fuzz_dummy {
     pub unsafe fn secp256k1_ec_pubkey_combine(cx: *const Context,
                                               out: *mut PublicKey,
                                               ins: *const *const PublicKey,
-                                              n: c_int)
+                                              n: size_t)
                                               -> c_int {
         check_context_flags(cx, 0);
         assert!(n >= 1);

src/key.rs

@@ -676,7 +676,7 @@ impl PublicKey {
                 ffi::secp256k1_context_no_precomp,
                 &mut ret,
                 ptrs.as_c_ptr(),
-                keys.len() as i32,
+                keys.len(),
             ) == 1
             {
                 Ok(PublicKey(ret))