static fun fromBytes(bytes: Bytes!): Key! (source)
Create a Key from an array of bytes. 
 The byte array must be of length #length().
bytes - Bytes!: The bytes for the key.
Return
Key!: A key, based on the supplied bytes.
static fun fromBytes(bytes: ByteArray!): Key! (source)
Create a Key from an array of bytes. 
 The byte array must be of length #length().
bytes - ByteArray!: The bytes for the key.
UnsupportedOperationException - If XChaCha20Poly1305 support is not available.
Return
Key!: A key, based on the supplied bytes.