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-rw-r--r--agent/keyformat.txt7
1 files changed, 6 insertions, 1 deletions
diff --git a/agent/keyformat.txt b/agent/keyformat.txt
index 3ebba6e50..7ba6af2fb 100644
--- a/agent/keyformat.txt
+++ b/agent/keyformat.txt
@@ -155,7 +155,12 @@ to keys stored on a token:
The currently used protocol is "ti-v1" (token info version 1). The
second list with the information has this layout:
-(card_serial_number id_string_of_key)
+(card_serial_number id_string_of_key fixed_pin_length)
+
+FIXED_PIN_LENGTH is optional. It can be used to store the length of
+the PIN; a value of 0 indicates that this information is not
+available. The rationale for this field is that some pinpad equipped
+readers don't allow passing a variable length PIN.
More items may be added to the list.