ibc-go compatible packet commitment

Author: rnbguy

cairo-contracts/packages/core/src/commitment/types.cairo

@@ -52,7 +52,9 @@ pub fn compute_packet_commitment(
     json_packet_data: @ByteArray, timeout_height: Height, timeout_timestamp: Timestamp
 ) -> Commitment {
     let mut coll = U32CollectorImpl::init();
-    coll.extend(timeout_timestamp);
+    // ibc-go uses nanosecs
+    // https://github.com/cosmos/ibc-go/blob/98d7e7550a23ecf8d96ce042ab11ef857b184f2a/proto/ibc/core/channel/v1/channel.proto#L179-L180
+    coll.extend(timeout_timestamp.timestamp * 1_000_000_000);
     coll.extend(timeout_height);
     coll.extend_from_chunk(compute_sha256_byte_array(json_packet_data));
     compute_sha256_u32_array(coll.value(), 0, 0).into()

cairo-contracts/packages/core/src/tests/commitment.cairo

@@ -52,7 +52,7 @@ fn test_array_u8_into_array_u32() {
 fn test_compute_packet_commitment() {
     let commitment = PACKET_COMMITMENT_ON_SN(ERC20());
     let expected: [u32; 8] = [
-        3458244073, 1576048754, 4210798310, 1002247062, 2365181318, 2763927782, 545147151, 944653547
+        1561496803, 591083406, 1958596266, 2480824962, 846563094, 2634790765, 145282158, 2139799705
     ];
     assert_eq!(commitment, expected.into());
 }