(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_sign_open — Check that the signed message has a valid signature
$signed_message, string $public_key): string|falseVerify the signature attached to a message and return the message
signed_messageA message signed with sodium_crypto_sign()
public_keyAn Ed25519 public key
Returns the original signed message on success, or false on failure.