Primitive type formats
This section defines the wire format for a number of primitive types.
M_ASCIIString
This represents an arbitrary ASCII string.
Strings always include a final 0 byte, which is included in the length n below.
| Field | Size | Format | Meaning |
|---|---|---|---|
n |
4 bytes |
Little-endian unsigned integer |
Number of bytes in string |
Content |
n bytes |
ASCII data |
The contents of the string |
Padding |
0-3 bytes |
0-valued bytes |
Rounds length up to a multiple of 4 bytes total |
M_Bignum
This represents an arbitrary integer.
All bignums are multiples of 4 bytes long. Apart from that, normally the minimal representation is used, except that 0 is always represented by 4 bytes.
| Field | Size | Format | Meaning |
|---|---|---|---|
n |
4 bytes |
Little-endian unsigned integer |
Number of bytes in bignum |
Content |
n bytes |
Little-endian integer |
The value of the integer |
M_ByteBlock
This represents an arbitrary byte string
| Field | Size | Format | Meaning |
|---|---|---|---|
n |
4 bytes |
Little-endian unsigned integer |
Number of bytes in byteblock |
Content |
n bytes |
Binary data |
The contents of the byteblock |
Padding |
0-3 bytes |
0-valued bytes |
Rounds length up to a multiple of 4 bytes total |
M_FileID
This represents an 11-byte string, usually a filename on a smartcard.
| Field | Size | Format | Meaning |
|---|---|---|---|
Content |
11 bytes |
Binary data |
The contents of the file ID |
M_Hash
This represents a 20-byte string, often the result of a SHA-1 hash or similar.
| Field | Size | Format | Meaning |
|---|---|---|---|
Content |
20 bytes |
Binary data |
The contents of the hash |
M_Hash32
This represents a 32-byte string, often the result of a SHA-256 hash or similar.
| Field | Size | Format | Meaning |
|---|---|---|---|
Content |
32 bytes |
Binary data |
The contents of the hash |