diff options
| -rw-r--r-- | firmware/src/simtrace/iso7816_uart.c | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/firmware/src/simtrace/iso7816_uart.c b/firmware/src/simtrace/iso7816_uart.c index 6186e5e..37b2fd7 100644 --- a/firmware/src/simtrace/iso7816_uart.c +++ b/firmware/src/simtrace/iso7816_uart.c @@ -251,6 +251,20 @@ static void set_state(struct iso7816_3_handle *ih, enum iso7816_3_state new_stat ih->state = new_state; } +static enum iso7816_3_state +transition_to_tck(struct iso7816_3_handle *ih) +{ + if (ih->prot_t_supported == 0x01) { + /* If only T=0 supported, there is no TCK but we + * immediately transition to APDUs */ + set_atr_state(ih, ATR_S_DONE); + return ISO7816_S_WAIT_APDU; + } else { + set_atr_state(ih, ATR_S_WAIT_TCK); + return ISO7816_S_IN_ATR; + } +} + /* determine the next ATR state based on received interface byte */ static enum atr_state next_intb_state(struct iso7816_3_handle *ih, u_int8_t ch) { @@ -288,7 +302,11 @@ from_tc: if (ih->atr_last_td & 0x80) return ATR_S_WAIT_TD; - return ATR_S_WAIT_HIST; + /* Historical bytes are common, but optional! */ + if (ih->atr_hist_len) + return ATR_S_WAIT_HIST; + else + return transition_to_tck(ih); } /* process an incomng ATR byte */ @@ -324,16 +342,8 @@ process_byte_atr(struct iso7816_3_handle *ih, u_int8_t byte) case ATR_S_WAIT_HIST: ih->atr_hist_len--; /* after all historical bytes are recieved, go to TCK */ - if (ih->atr_hist_len == 0) { - if (ih->prot_t_supported == 0x01) { - /* If only T=0 supported, there is no - * TCK but we immediately transition to - * APDUs */ - set_atr_state(ih, ATR_S_DONE); - return ISO7816_S_WAIT_APDU; - } - set_atr_state(ih, ATR_S_WAIT_TCK); - } + if (ih->atr_hist_len == 0) + return transition_to_tck(ih); break; case ATR_S_WAIT_TCK: /* FIXME: process and verify the TCK */ |