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Adding U2F formats #671

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Adding U2F formats #671

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12 changes: 12 additions & 0 deletions lib_stusb_impl/u2f_impl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -280,6 +280,18 @@ int u2f_get_cmd_msg_data_length(const uint8_t *buffer, uint16_t length)
return 0;
}

if (length == APDU_MIN_HEADER + 2) {
// Short encoding, with either:
// - both Lc (==0) and Le, or
// - Lc == 1 and 1B of data, no Le
if (buffer[4] == 0 || buffer[4] == 1) {
return buffer[4];
}
else {
return -1;
}
}

if (length < APDU_MIN_HEADER + 3) {
// Short encoding or bad length
// We don't support short encoding
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