On 2/10/2020 6:49 PM, Ivan Gerasimov wrote:
Hello!
Current implementation of the method
javax.smartcardio.CardChannel.transmit() has an internal limitation on
the maximum allowed amount of the transmitted data.
This limitation is dictated by the maximum number of iterations to
transmit data from a card: Each iteration can transmit up to 256
bytes of data, and we have a hardcoded limit of 32 iterations.
Over time, we've received requests to increase this limit, as there
are occasions when the effective limit of 8k is not enough.
Would you please help review a proposal: First, it is proposed to
increase the default limit of iteration to 128 (so that up to 32k of
data can be transmitted); Second, the limit of iterations is made
configurable via a System property. This limit can be increased up to
4096 (so that the total amount of transmitted data can be made up to 1m).
BUGURL: https://bugs.openjdk.java.net/browse/JDK-8163251
WEBREV: http://cr.openjdk.java.net/~igerasim/8163251/00/webrev/
If there is an agreement on the proposal, I'll file a CSR to document
a new System property.
Thanks in advance!
Given that the maximum length for an extended APDU is 64K (65536) (hmm
+7 for the header and +2 for LE), and for its return is 64K + 2 bytes,
I'm not quite sure why you'd up the number to 4096/1M - I'd set the
default and fixed value to 257 (64K) and leave it at that.
Mike
