com.dalsemi.onewire.application.sha
Class SHAiButtonUser18

java.lang.Object
  |
  +--com.dalsemi.onewire.application.sha.SHAiButtonUser
        |
        +--com.dalsemi.onewire.application.sha.SHAiButtonUser18

public class SHAiButtonUser18

extends SHAiButtonUser

Class representing DS1963S (or DS2421), family-code 0x18, SHA iButtons as a user token in SHA Transactions.

Version:

1.00

See Also:

SHATransaction, SHAiButtonCopr, SHAiButtonUser33

Constructor Summary

SHAiButtonUser18(SHAiButtonCopr copr)
Creates a mostly unitialized SHAiButtonUser object.

SHAiButtonUser18(SHAiButtonCopr copr, OneWireContainer18 owc)
Creates a valid SHAiButtonUser object.

SHAiButtonUser18(SHAiButtonCopr copr, OneWireContainer18 owc, boolean formatDevice, byte[] authSecret)
Initialize a DS1963S as a fresh user iButton for a given SHA service.

Method Summary

byte	getAuthorizationCommand() Returns a byte representing the appropriate authorization command for the coprocessor to use to authenticate this user.
void	getFullBindCode(byte[] l_fullBindCode, int offset) This function creates the full 15-byte binding data for the coprocessor to use to recreate this user's secret on the copr's workspace page.
int	getWriteCycleCounter() Returns the value of the write cycle counter for the page where the account data is stored.
boolean	hasWriteCycleCounter() Returns true if this buttons account data is stored on a page that has a write cycle counter.
boolean	readAccountData(byte[] dataBuffer, int offset) Reads the account data off the SHAiButton using a standard READ command.
int	readAccountData(byte[] chlg, int chlgStart, byte[] dataBuffer, int dataStart, byte[] mac, int macStart) Reads the account data off the SHAiButton using a READ_AUTHENTICATE command.
boolean	setiButton18(OneWireContainer18 owc) Modifies this SHA iButton so that it refers to another DS1963S container.
boolean	setiButtonUser(byte[] address) Modifies this SHA iButton so that it refers to another device.
boolean	setiButtonUser(DSPortAdapter adapter, byte[] address) Modifies this SHA iButton so that it refers to another 1963S.
boolean	writeAccountData(byte[] dataBuffer, int offset) Writes the account data to the SHAiButton.

Methods inherited from class com.dalsemi.onewire.application.sha.SHAiButtonUser

getAccountFilename, getAccountPageNumber, getAddress, getAddress, getAddress, getForceOverdrive, setForceOverdrive, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SHAiButtonUser18

public SHAiButtonUser18(SHAiButtonCopr copr,
                        OneWireContainer18 owc,
                        boolean formatDevice,
                        byte[] authSecret)
                 throws OneWireException,
                        OneWireIOException

Initialize a DS1963S as a fresh user iButton for a given SHA service. This constructor not only creates the service file for the user iButton using the TMEX file structure, but it also installs the master authentication secret and binds it to the iButton (making it unique for a particular button). Optionally, the device can be formatted before the service file is installed.

Parameters:

copr - The SHAiButtonCopr to which the user object is tied. This Coprocessor contains the necessary binding code and service filename, necessary for both locating a user and recreating his unique secret.

owc - The DS1963S iButton that this object will refer to.

formatDevice - If true, the TMEX filesystem will be formatted before the account service file is created.

authSecret - The master authentication secret for the systm.

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from a 1-Wire device. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

See Also:

SHAiButtonUser18(SHAiButtonCopr,OneWireContainer18), SHAiButtonUser18(SHAiButtonCopr)

SHAiButtonUser18

public SHAiButtonUser18(SHAiButtonCopr copr,
                        OneWireContainer18 owc)
                 throws OneWireException,
                        OneWireIOException

Creates a valid SHAiButtonUser object. If the service file, whose name is taken from the SHAiButtonCopr, is not found on the user iButton, a OneWireException is thrown with the message "Invalid SHA user".

Parameters:

copr - The SHAiButtonCopr to which the user object is tied. This Coprocessor contains the necessary binding code and service filename, necessary for both locating a user and recreating his unique secret.

owc - The DS1963S iButton that this object will refer to.

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from a 1-Wire device. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

See Also:

SHAiButtonUser18(SHAiButtonCopr,OneWireContainer18,boolean,byte[]), SHAiButtonUser18(SHAiButtonCopr)

SHAiButtonUser18

public SHAiButtonUser18(SHAiButtonCopr copr)

Creates a mostly unitialized SHAiButtonUser object. This constructor merely copies the coprocessors 7 byte binding code into a local cache and stores the name of the account service file used for all user iButtons.

Since this constructor leaves data unitialized, you should be very careful with the use of it. It is expected that after calling this constructor, the user will call setiButton to finish the initialization process. On memory-starved platforms, this should help optimize memory usage.

Parameters:

copr - The SHAiButtonCopr to which the user object is tied. This Coprocessor contains the necessary binding code and service filename, necessary for both locating a user and recreating his unique secret.

See Also:

SHAiButtonUser18(SHAiButtonCopr,OneWireContainer18,boolean,byte[]), SHAiButtonUser18(SHAiButtonCopr)

Method Detail

setiButton18

public boolean setiButton18(OneWireContainer18 owc)
                     throws OneWireException,
                            OneWireIOException

Modifies this SHA iButton so that it refers to another DS1963S container. This function only copies the reference to the OneWireContainer, copes the reference to it's 1-Wire address, and then asserts that the iButton contains a valid acccount info file associated with the system.

Parameters:

owc - The OneWireContainer18 this object will refer to.

Returns:

true if a valid account service file exists on this OneWireContainer18.

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from a 1-Wire device. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

setiButtonUser

public boolean setiButtonUser(DSPortAdapter adapter,
                              byte[] address)
                       throws OneWireException,
                              OneWireIOException

Modifies this SHA iButton so that it refers to another 1963S. If this object already has an appropriate instance of OneWireContainer, that instance is updated with the new address.

Overrides:

setiButtonUser in class SHAiButtonUser

Parameters:

adapter - The adapter that the device can be found on.

address - The address of the 1-Wire device

Returns:

true if a valid account service file exists on this OneWireContainer18.

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from a 1-Wire device. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

setiButtonUser

public boolean setiButtonUser(byte[] address)
                       throws OneWireException,
                              OneWireIOException

Modifies this SHA iButton so that it refers to another device. If this object does not already has an appropriate instance of OneWireContainer, it returns false immediately, because there is no adapter info available. Otherwise, it reuses the same adapter.

Overrides:

setiButtonUser in class SHAiButtonUser

Parameters:

address - The address of the 1-Wire device

Returns:

true if a valid account service file exists on this OneWireContainer18.

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from a 1-Wire device. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

getWriteCycleCounter

public int getWriteCycleCounter()
                         throws OneWireException,
                                OneWireIOException

Returns the value of the write cycle counter for the page where the account data is stored. If the write cycle counter has ever been retrieved, this returns the cached value. Otherwise, this method reads the value from the part.

Overrides:

getWriteCycleCounter in class SHAiButtonUser

Returns:

the value of the write cycle counter for the account data page.

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from a 1-Wire device. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

hasWriteCycleCounter

public boolean hasWriteCycleCounter()

Returns true if this buttons account data is stored on a page that has a write cycle counter.

Overrides:

hasWriteCycleCounter in class SHAiButtonUser

Returns:

true if account page has write cycle counter.

getFullBindCode

public void getFullBindCode(byte[] l_fullBindCode,
                            int offset)

This function creates the full 15-byte binding data for the coprocessor to use to recreate this user's secret on the copr's workspace page. This function is located in the SHAiButtonUser class to support binding codes for user buttons who use alternate techniques (such as the DS1961S) for secret computation.

For the DS1963S user iButton, the format of the full bind code is as follows:

      (bindCode+0), (bindCode+1), (bindCode+2), (bindCode+3),
      (svcPageNum), (deviceAN+0), (deviceAN+1), (deviceAN+2),
      (deviceAN+3), (deviceAN+4), (deviceAN+5), (deviceAN+6),
      (bindCode+4), (bindCode+5), (bindCode+6)
   

Overrides:

getFullBindCode in class SHAiButtonUser

Parameters:

bindCode - the 7-byte binding code from coprocessor's service file

fullBindCode - the 15-byte full binding code to to be copied into the coprocessor's scratchpad. There should be 15 bytes available starting from the offset.

offset - the offset into fullBindCode where copying should begin.

getAuthorizationCommand

public byte getAuthorizationCommand()

Returns a byte representing the appropriate authorization command for the coprocessor to use to authenticate this user. For a DS1963S, the authentication command is VALIDATE_PAGE.

Overrides:

getAuthorizationCommand in class SHAiButtonUser

Returns:

byte indicating appropriate command for authenticating user

writeAccountData

public boolean writeAccountData(byte[] dataBuffer,
                                int offset)
                         throws OneWireException,
                                OneWireIOException

Writes the account data to the SHAiButton. First, this function asserts that the account page number is known. The account data is copied from dataBuffer starting at the offset. If there are less than 32 bytes available to copy, this function only copies the bytes that are available.

Overrides:

writeAccountData in class SHAiButtonUser

Parameters:

dataBuffer - the buffer to copy the account data from

offset - the index into the buffer where copying should begin

Returns:

whether or not the data write succeeded

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from a 1-Wire device. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

readAccountData

public boolean readAccountData(byte[] dataBuffer,
                               int offset)
                        throws OneWireException,
                               OneWireIOException

Reads the account data off the SHAiButton using a standard READ command. First, this function asserts that the account page number is known as well as the length of the account file. The 32 byte account data page is copied into dataBuffer starting at the given offset.

Overrides:

readAccountData in class SHAiButtonUser

Parameters:

dataBuffer - the buffer to copy the account data into

offset - the index into the buffer where copying should begin

Returns:

whether or not the read was successful

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from a 1-Wire device. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter

readAccountData

public int readAccountData(byte[] chlg,
                           int chlgStart,
                           byte[] dataBuffer,
                           int dataStart,
                           byte[] mac,
                           int macStart)
                    throws OneWireException,
                           OneWireIOException

Reads the account data off the SHAiButton using a READ_AUTHENTICATE command. First, this function asserts that the account page number is known as well as the length of the account file. Then it copies the 3 byte challenge to the scratchpad before sending the command for READ_AUTHENTICATE. The 32 byte account data page is copied into dataBuffer starting at dataStart.

In addition to the account data, this function also returns a calculated MAC. The MAC requires 20 bytes after the start index. The return value is the write cycle counter value for the account data page

Overrides:

readAccountData in class SHAiButtonUser

Parameters:

chlg - the buffer containing a 3-byte random challenge.

chlgStart - the index into the buffer where the 3 byte challenge begins.

dataBuffer - the buffer to copy the account data into

dataStart - the index into the buffer where copying should begin

mac - the buffer to copy the resulting Message Authentication Code

macStart - the index into the mac buffer to start copying

Returns:

the value of the write cycle counter for the page

Throws:

OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from a 1-Wire device. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.

OneWireException - on a communication or setup error with the 1-Wire adapter