# sodium_crypto_sign_open

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_sign_open — Check that the signed message has a valid signature

### Descripción

sodium_crypto_sign_open(string `$signed_message`, string `$public_key`): string|false

Verify the signature attached to a message and return the message

### Parámetros

`signed_message`

  A message signed with sodium_crypto_sign()

`public_key`

  An Ed25519 public key

### Valores devueltos

Returns the original signed message on success, o `false` en caso de error.