Fix: EIP-2539 (polkadot-evm#1207)

* Fix: map_fp2_to_g2 input length check

* Add clear_cofactor to mapping operation

frame/evm/precompile/bls12377/src/lib.rs

@@ -604,7 +604,7 @@ impl Precompile for Bls12377MapG1 {
 
 		let fq = read_fq(input, 0)?;
 		let g1 = match map_to_curve_g1(fq) {
-			Ok(point) => point,
+			Ok(point) => point.clear_cofactor(),
 			Err(_) => {
 				return Err(PrecompileFailure::Error {
 					exit_status: ExitError::Other("map to curve failed".into()),
@@ -635,15 +635,15 @@ impl Precompile for Bls12377MapG2 {
 		handle.record_cost(Bls12377MapG2::GAS_COST)?;
 
 		let input = handle.input();
-		if input.len() != 64 {
+		if input.len() != 128 {
 			return Err(PrecompileFailure::Error {
 				exit_status: ExitError::Other("invalid input length".into()),
 			});
 		}
 
 		let fq2 = read_fq2(input, 0)?;
 		let g2 = match map_to_curve_g2(fq2) {
-			Ok(point) => point,
+			Ok(point) => point.clear_cofactor(),
 			Err(_) => {
 				return Err(PrecompileFailure::Error {
 					exit_status: ExitError::Other("map to curve failed".into()),