General structure
The general structure of commands and responses is as follows:
Commands
| Field | Type | Content | Note |
|---|
| CLA | byte (1) | Application Identifier | 0xF9 |
| INS | byte (1) | Instruction ID | |
| P1 | byte (1) | Parameter 1 | |
| P2 | byte (1) | Parameter 2 | |
| L | byte (1) | Bytes in payload | |
| PAYLOAD | byte (L) | Payload | |
Response
| Field | Type | Content | Note |
|---|
| ANSWER | byte (?) | Answer | depends on the command |
| SW1-SW2 | byte (2) | Return code | see list of return codes |
Return codes
| Return code | Description |
|---|
| 0x6400 | Execution Error |
| 0x6700 | Wrong buffer length |
| 0x6982 | Empty buffer |
| 0x6983 | Output buffer too small |
| 0x6984 | Data is invalid |
| 0x6986 | Command not allowed |
| 0x6987 | Tx is not initialized |
| 0x6B00 | P1/P2 are invalid |
| 0x6D00 | INS not supported |
| 0x6E00 | CLA not supported |
| 0x6F00 | Unknown |
| 0x6F01 | Sign / verify error |
| 0x9000 | Success |
Command definition
GET_DEVICE_INFO
Command
| Field | Type | Content | Expected |
|---|
| CLA | byte (1) | Application Identifier | 0xE0 |
| INS | byte (1) | Instruction ID | 0x01 |
| P1 | byte (1) | Parameter 1 | 0x00 |
| P2 | byte (1) | Parameter 2 | 0x00 |
| L | byte (1) | Bytes in payload | 0x00 |
Response
| Field | Type | Content | Note |
|---|
| TARGET_ID | byte (4) | Target Id | |
| OS_LEN | byte (1) | OS version length | 0..64 |
| OS | byte (?) | OS version | Non terminated string |
| FLAGS_LEN | byte (1) | Flags length | 0 |
| MCU_LEN | byte (1) | MCU version length | 0..64 |
| MCU | byte (?) | MCU version | Non terminated string |
| SW1-SW2 | byte (2) | Return code | see list of return codes |
GET_VERSION
Command
| Field | Type | Content | Expected |
|---|
| CLA | byte (1) | Application Identifier | 0xF9 |
| INS | byte (1) | Instruction ID | 0x00 |
| P1 | byte (1) | Parameter 1 | ignored |
| P2 | byte (1) | Parameter 2 | ignored |
| L | byte (1) | Bytes in payload | 0 |
Response
| Field | Type | Content | Note |
|---|
| TEST | byte (1) | Test Mode | 0x01 means test mode is enabled |
| MAJOR | byte (2) | Version Major | 0..65535 |
| MINOR | byte (2) | Version Minor | 0..65535 |
| PATCH | byte (2) | Version Patch | 0..65535 |
| LOCKED | byte (1) | Device is locked | It'll always be 0 |
| TARGET_ID | byte (4) | Target Id | |
| SW1-SW2 | byte (2) | Return code | see list of return codes |
INS_GET_ADDR
Command
| Field | Type | Content | Expected |
|---|
| CLA | byte (1) | Application Identifier | 0xF9 |
| INS | byte (1) | Instruction ID | 0x01 |
| P1 | byte (1) | Request User confirmation | No = 0 / Yes = 1 |
| P2 | byte (1) | Parameter 2 | 0 - ED25519 <br>2 - ECDSA |
| L | byte (1) | Bytes in payload | 22 bytes |
| Path[0] | byte (4) | Derivation Path Data | 0x80000000 | 44 |
| Path[1] | byte (4) | Derivation Path Data | 0x80000000 | 354 |
| Path[2] | byte (4) | Derivation Path Data | ? |
| Path[3] | byte (4) | Derivation Path Data | ? |
| Path[4] | byte (4) | Derivation Path Data | ? |
| SS58 | byte (2) | SS58 for addr encoding | Not used if P2 = 2 |
Response
| Field | Type | Content | Note |
|---|
| PK | byte (32) | Public Key | |
| ADDR | byte (??) | address | |
| SW1-SW2 | byte (2) | Return code | see list of return codes |
| Field | Type | Content | Note |
|---|
| PK | byte (33) | Compressed Public Key | |
| ADDR | byte (20) | Address | |
| SW1-SW2 | byte (2) | Return code | see list of return codes |
INS_SIGN
Command
| Field | Type | Content | Expected |
|---|
| CLA | byte (1) | Application Identifier | 0xF9 |
| INS | byte (1) | Instruction ID | 0x02 |
| P1 | byte (1) | Payload desc | 0 = init |
| | | 1 = add |
| | | 2 = last |
| P2 | byte (1) | Parameter 2 | 0 - ED25519 <br>2 - ECDSA |
| L | byte (1) | Bytes in payload | (depends) |
The first packet/chunk includes only the derivation path and tx length.
All other packets/chunks contain data chunks that are described below. Blob + metadata should be concatenated without
spacing.
First Packet
| Field | Type | Content | Expected |
|---|
| Path[0] | byte (4) | Derivation Path Data | 0x80000000 | 44 |
| Path[1] | byte (4) | Derivation Path Data | 0x80000000 | 354 |
| Path[2] | byte (4) | Derivation Path Data | ? |
| Path[3] | byte (4) | Derivation Path Data | ? |
| Path[4] | byte (4) | Derivation Path Data | ? |
| BLOB L | byte (2) | Length of blob (excluding metadata) | ? |
Other Chunks/Packets
| Field | Type | Content | Expected |
|---|
| Message | bytes... | Message to Sign | |
Response
| Field | Type | Content | Note |
|---|
| SIG | byte (65) | Signature | |
| SW1-SW2 | byte (2) | Return code | see list of return codes |
| Field | Type | Content | Note |
|---|
| SIG | byte (65) | Signature | RSV format:<br>r - 32 bytes<br>s - 32 bytes<br>v - 1 byte |
| SW1-SW2 | byte (2) | Return code | see list of return codes |
INS_SIGN_RAW
Command
| Field | Type | Content | Expected |
|---|
| CLA | byte (1) | Application Identifier | 0xF9 |
| INS | byte (1) | Instruction ID | 0x03 |
| P1 | byte (1) | Payload desc | 0 = init |
| | | 1 = add |
| | | 2 = last |
| P2 | byte (1) | Parameter 2 | 0 - ED25519 <br>2 - ECDSA |
| L | byte (1) | Bytes in payload | (depends) |
The first packet/chunk includes only the derivation path
All other packets/chunks contain data chunks that are described below
First Packet
| Field | Type | Content | Expected |
|---|
| Path[0] | byte (4) | Derivation Path Data | 0x80000000 | 44 |
| Path[1] | byte (4) | Derivation Path Data | 0x80000000 | 354 |
| Path[2] | byte (4) | Derivation Path Data | ? |
| Path[3] | byte (4) | Derivation Path Data | ? |
| Path[4] | byte (4) | Derivation Path Data | ? |
| MSG L | byte (2) | Length of message | ? |
Other Chunks/Packets
| Field | Type | Content | Expected |
|---|
| Message | bytes... | Message to Sign | |
Response
| Field | Type | Content | Note |
|---|
| SIG | byte (65) | Signature | |
| SW1-SW2 | byte (2) | Return code | see list of return codes |
| Field | Type | Content | Note |
|---|
| SIG | byte (65) | Signature | RSV format:<br>r - 32 bytes<br>s - 32 bytes<br>v - 1 byte |
| SW1-SW2 | byte (2) | Return code | see list of return codes |
