runtime: Fix FixedBytes conversion to respect size parameter

incrypto32 · incrypto32 · commit c61c36a34929 · 2025-10-04T09:31:07.000+04:00
diff --git a/runtime/wasm/src/to_from/external.rs b/runtime/wasm/src/to_from/external.rs
@@ -166,8 +166,9 @@ impl ToAscObj<AscEnum<EthereumValueKind>> for abi::DynSolValue {
 
                 asc_new(heap, &n, gas)?.to_payload()
             }
-            Self::FixedBytes(val, _) => {
-                asc_new::<Uint8Array, _, _>(heap, val.as_slice(), gas)?.to_payload()
+            Self::FixedBytes(val, size) => {
+                // FixedBytes stores the value in a 32-byte word, but we only want the first `size` bytes
+                asc_new::<Uint8Array, _, _>(heap, &val.as_slice()[..*size], gas)?.to_payload()
             }
             Self::Address(val) => {
                 asc_new::<AscAddress, _, _>(heap, val.as_slice(), gas)?.to_payload()

Original file line number	Diff line number	Diff line change
`@@ -166,8 +166,9 @@ impl ToAscObj<AscEnum<EthereumValueKind>> for abi::DynSolValue {`
`166`	`166`
`167`	`167`	`asc_new(heap, &n, gas)?.to_payload()`
`168`	`168`	`}`
`169`		`- Self::FixedBytes(val, _) => {`
`170`		`- asc_new::<Uint8Array, _, _>(heap, val.as_slice(), gas)?.to_payload()`
	`169`	`+ Self::FixedBytes(val, size) => {`
	`170`	+ // FixedBytes stores the value in a 32-byte word, but we only want the first `size` bytes
	`171`	`+ asc_new::<Uint8Array, _, _>(heap, &val.as_slice()[..*size], gas)?.to_payload()`
`171`	`172`	`}`
`172`	`173`	`Self::Address(val) => {`
`173`	`174`	`asc_new::<AscAddress, _, _>(heap, val.as_slice(), gas)?.to_payload()`