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Download source - MiFare is widely used for ticketing Oyster card at London underground or for access control. The helper class introduced in this article aims to simplify the use of MiFare memory cards in a. NET application. This article addresses the so-called MiFare classic, which are shipped in two sizes: 1 kilobytes and 4 kilobytes. The 1K memory card is organized in 16 sectors. Each sector is made up of 4 datablocks, and each datablock is 16 bytes in size.
The 4th datablock stores read and write permissions for each of the remaining 3 datablocks. The 4th datablock also stores the access keys. According to MiFare specifications, two keys exists, named keyA and keyB. Each key can be granted a different set of operations on the datablocks. Datablocks in a sector can be read or written only after the application as successfully logged in into the sector with the proper key. The 4K memory card is organized in a similar way.
There are 40 sectors. The first 32 sectors have 4 datablocks, the remaining 8 have 16 datablocks. The first datablock of sector 0 stores some read-only manufacturer information. An application directory says which application used each sector on the card.
The application is identified by a unique identifier registered to a Mifare authority. MAD in sector 0 handles applications in sectors from 1 to The FileReaderCard class reads and writes data from a text file on disk. This makes it easy to test the helper class even if a MiFare reader is not available.
This methods allows to write data of any length. Trailer sectors are not overwritten. This method returns a Sector object. Flush ; Note that to write back changes on card, call the Flush method.
This method will take care to write on disk only the datablocks that have actually changed. AccessConditions class also allows the application to set keys A and B, and also to set whether the MAD is in use or not. GetSector 0 ; sector0. KeyAOrB; sector0. KeyB; sector0. Never; sector0. AddAppId int appId : This method insert reserves a sector to the given application and returns the number of the sector reserved.
GetSectors 0x ; int appSector; If sectors! GetSector appSector ; History.
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