Returns the length of the sealed data on success, or FALSE on error.
If successful the sealed data is returned in
sealed_data, and the envelope keys in
openssl_seal() seals (encrypts)
data by using RC4 with a randomly generated
secret key. The key is encrypted with each of the public keys
associated with the identifiers in
and each encrypted key is returned
env_keys. This means that one can send
sealed data to multiple recipients (provided one has obtained their
public keys). Each recipient must receive both the sealed data and
the envelope key that was encrypted with the recipient's public key.
Example 1. openssl_seal() example
See also openssl_open().