SecurityHelperImpl
constructor(passphraseStorage: PassphraseStorage, databaseMigrator: DatabaseMigrator = ::migrateDatabaseKey, isSqlCipherSaltStored: Boolean = false)
Parameters
isSqlCipherSaltStored
whether the global and user databases need their SQLCipher salt stored, because SQLCipher can't keep it in their header. On iOS, where that header stays readable. Their secret, under the same alias, is then 48 random bytes instead of 32: the key followed by its 16-byte salt, so the two can't go missing apart. The salt isn't secret, and rotating the key has to keep it.