Package javacardx.apdu.util
Class APDUUtil
- java.lang.Object
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- javacardx.apdu.util.APDUUtil
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static byte
getCLAChannel(byte CLAbyte)
Returns the logical channel number encoded in theCLAbyte
parameter which represents a CLA byte from a command APDU.static boolean
isCommandChainingCLA(byte CLAbyte)
Based on encoding of theCLAByte
parameter which represents a CLA byte from a command APDU, returns whether anAPDU
command is the first or part of a command chain.static boolean
isISOInterindustryCLA(byte CLAbyte)
Returns whether theCLAByte
parameter which represents a CLA bye from a command APDU, corresponds to an interindustry command as defined in ISO 7816-4:2013 specification.static boolean
isSecureMessagingCLA(byte CLAbyte)
Returnstrue
if encoding of theCLAbyte
parameter, which represents a CLA byte from a command APDU, indicates secure messaging.static boolean
isValidCLA(byte CLAbyte)
Returns whether the currentCLAByte
parameter represents a valid CLA byte.
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Method Detail
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getCLAChannel
public static byte getCLAChannel(byte CLAbyte)
Returns the logical channel number encoded in theCLAbyte
parameter which represents a CLA byte from a command APDU. A number in the range 0-19 based on the CLA byte encoding is returned if the CLA contains logical channel encoding. If the CLA byte does not contain logical channel information, 0 is returned.Note:
- This method returns 0 if the CLA bits (b8,b7,b6) is %b001 which is a CLA encoding reserved for future use(RFU), or if CLA is 0xFF which is an invalid value as defined in the ISO 7816-4:2013 specification.
See Runtime Environment Specification, Java Card Platform, Classic Edition, section 4.3 for encoding details.
- Parameters:
CLAbyte
- is CLA byte from a command APDU- Returns:
- logical channel number, if present, within the CLA byte, 0 otherwise
- Since:
- 3.0.5
- See Also:
APDU.getCLAChannel()
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isSecureMessagingCLA
public static boolean isSecureMessagingCLA(byte CLAbyte)
Returnstrue
if encoding of theCLAbyte
parameter, which represents a CLA byte from a command APDU, indicates secure messaging. The secure messaging information is in bits (b4,b3) for commands with origin channel numbers 0-3, and in bit b6 for origin channel numbers 4-19.Note:
- This method returns
false
if the CLA bits (b8,b7,b6) is %b001 which is a CLA encoding reserved for future use(RFU), or if CLA is 0xFF which is an invalid value as defined in the ISO 7816-4:2013 specification.
See Runtime Environment Specification, Java Card Platform, Classic Edition, section 4.3 for encoding details.
- Parameters:
CLAbyte
- is CLA byte from a command APDU- Returns:
true
if the secure messaging bit(s) is(are) nonzero,false
otherwise- Since:
- 3.0.5
- See Also:
APDU.isSecureMessagingCLA()
- This method returns
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isCommandChainingCLA
public static boolean isCommandChainingCLA(byte CLAbyte)
Based on encoding of theCLAByte
parameter which represents a CLA byte from a command APDU, returns whether anAPDU
command is the first or part of a command chain. Bit b5 of the CLA byte if set, indicates that theAPDU
is the first or part of a chain of commands.Note:
- This method returns
false
if the CLA bits (b8,b7,b6) is %b001 which is a CLA encoding reserved for future use(RFU), or if CLA is 0xFF which is an invalid value as defined in the ISO 7816-4:2013 specification.
See Runtime Environment Specification, Java Card Platform, Classic Edition, section 4.3 for encoding details.
- Parameters:
CLAbyte
- is CLA byte from a command APDU- Returns:
true
if the CLA byte encoding indicates if an APDU is not the last APDU of a command chain,false
otherwise.- Since:
- 3.0.5
- See Also:
APDU.isCommandChainingCLA()
- This method returns
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isISOInterindustryCLA
public static boolean isISOInterindustryCLA(byte CLAbyte)
Returns whether theCLAByte
parameter which represents a CLA bye from a command APDU, corresponds to an interindustry command as defined in ISO 7816-4:2013 specification. Bit b8 of the CLA byte if0
, indicates that theAPDU
is an interindustry command.- Parameters:
CLAbyte
- is CLA byte from a command APDU- Returns:
true
if this APDU CLA byte corresponds to an ISO interindustry command,false
otherwise.- Since:
- 3.0.5
- See Also:
APDU.isISOInterindustryCLA()
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isValidCLA
public static boolean isValidCLA(byte CLAbyte)
Returns whether the currentCLAByte
parameter represents a valid CLA byte. The CLA byte is invalid if the CLA bits (b8,b7,b6) is %b001, which is a CLA encoding reserved for future use(RFU), or if CLA is 0xFF which is an invalid value as defined in the ISO 7816-4:2013 specification.See Runtime Environment Specification, Java Card Platform, Classic Edition, section 4.3 for encoding details.
- Parameters:
CLAbyte
- is CLA byte from a command APDU- Returns:
true
if CLA byte is valid,false
otherwise.- Since:
- 3.0.5
- See Also:
APDU.isValidCLA()
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