@polkadot/util-crypto/sr25519/verify.js

import { u8aToU8a } from '@polkadot/util';
import { sr25519Verify as wasmVerify } from '@polkadot/wasm-crypto';
/**
 * @name sr25519Verify
 * @description Verifies the signature of `message`, using the supplied pair
 */
export function sr25519Verify(message, signature, publicKey) {
    const publicKeyU8a = u8aToU8a(publicKey);
    const signatureU8a = u8aToU8a(signature);
    if (publicKeyU8a.length !== 32) {
        throw new Error(`Invalid publicKey, received ${publicKeyU8a.length} bytes, expected 32`);
    }
    else if (signatureU8a.length !== 64) {
        throw new Error(`Invalid signature, received ${signatureU8a.length} bytes, expected 64`);
    }
    return wasmVerify(signatureU8a, u8aToU8a(message), publicKeyU8a);
}