Add file

Author: mskd12

sdk/zklogin/src/poseidon.ts

@@ -39,7 +39,16 @@ const poseidonNumToHashFN = [
 	poseidon16,
 ];
 
+export const BN254_FIELD_SIZE = 21888242871839275222246405745257275088548364400416034343698204186575808495617n;
+
 export function poseidonHash(inputs: (number | bigint | string)[]): bigint {
+	inputs.forEach(x => {
+		const b = BigInt(x);
+		if (b < 0 || b >= BN254_FIELD_SIZE) {
+			throw new Error(`Element ${b} not in the BN254 field`);
+		}
+	});
+
 	const hashFN = poseidonNumToHashFN[inputs.length - 1];
 
 	if (hashFN) {