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# About LOCLASS attack
This document is primarily intended for understanding `hf iclass loclass` and used files with it.
This document is primarily intended for understanding `hf iclass loclass` and files used with it.
LOCLASS aim is to recoved the used masterkey for that specific reader configued in Elite mode / High Security mode.
LOCLASS, is a two part attack. First is the online part where you gather needed information from the reader by presenting a carefully selected CSN and save the responses to file. For the first part you run `hf iclass sim 2` and take notice of the saved filename.
The second part is offline, where the information gathered from the first step is used in a series of DES operations to figure out the used
masterkey. run `hf iclass loclass f abc.bin'
masterkey.
run `hf iclass loclass f abc.bin`
If you don't have access to a iClass SE reader configured in Elite mode there is a test file which you can use.
`hf iclass loclass f iclass_dump.bin`
`hf iclass loclass f iclass_dump.bin`
# Unit testing
In order to verify that loclass is actually working, there is a "unit" test mode. run `hf iclass loclass t`.
In order to verify that loclass is actually working, there is a "unit" test mode.
run `hf iclass loclass t`.
This test mode uses two files.
- iclass_dump.bin
this is a sample file from `hf iclass sim 2`, with complete keytable recovery, using 128 carefully selected CSN and the file contains the MAC results from reader.
- iclass_key.bin
this is file shall contain the legacy masterkey, AA1 key. loclass uses it to verify that permution / reversing / generation of key is correct.
- `iclass_dump.bin`
this is a sample file from `hf iclass sim 2`, with complete keytable recovery, using 128 carefully selected CSN and the file contains the MAC results from reader.
- `iclass_key.bin`
this is file shall contain the legacy masterkey, AA1 key. loclass uses it to verify that permution / reversing / generation of key is correct.