Crate xrpl_mithril_codec 

Binary serialization and deserialization for the XRPL protocol.

This crate implements the canonical binary encoding used by the XRP Ledger for transactions, ledger objects, and other protocol messages.

Architecture

• definitions — Field definitions loaded from definitions.json
• field_code — Field ID encoding (1-3 byte headers from type_code/field_code)
• error — Codec error types
• serializer — Canonical binary serialization
• deserializer — Binary to typed objects
• signing — Signing-specific serialization with hash prefixes

Examples

Serialize a transaction to binary and deserialize it back:

use serde_json::json;
use xrpl_mithril_codec::serializer::serialize_json_object;
use xrpl_mithril_codec::deserializer::deserialize_object;

// Build a minimal Payment transaction as JSON
let tx = json!({
    "TransactionType": "Payment",
    "Flags": 0u32,
    "Sequence": 1u32,
    "Fee": "12",
    "Account": "rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh",
    "Destination": "rPT1Sjq2YGrBMTttX4GZHjKu9dyfzbpAYe",
    "Amount": "1000000"
});

// Serialize to canonical binary
let map = tx.as_object().expect("json object");
let mut buf = Vec::new();
serialize_json_object(map, &mut buf, false)?;
assert!(!buf.is_empty());

// Deserialize back to JSON
let decoded = deserialize_object(&buf)?;
assert_eq!(decoded.get("TransactionType").and_then(|v| v.as_str()), Some("Payment"));
assert_eq!(decoded.get("Fee").and_then(|v| v.as_str()), Some("12"));
assert_eq!(decoded.get("Amount").and_then(|v| v.as_str()), Some("1000000"));
assert_eq!(
    decoded.get("Account").and_then(|v| v.as_str()),
    Some("rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")
);

Compute a transaction’s signing hash and transaction ID:

use serde_json::json;
use xrpl_mithril_codec::signing::{signing_hash, transaction_id_hex};

let tx = json!({
    "TransactionType": "Payment",
    "Sequence": 1u32,
    "Fee": "12",
    "Account": "rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh",
    "Destination": "rPT1Sjq2YGrBMTttX4GZHjKu9dyfzbpAYe",
    "Amount": "1000000",
    "SigningPubKey": "ED5F5AC43F527AE97194E860E5B28E6751B0B3BBEAC0780826AAF6DB9B3EE001",
    "TxnSignature": "DEADBEEFCAFE"
});
let map = tx.as_object().expect("json object");

// Signing hash (for the signer to sign over)
let hash = signing_hash(map)?;
assert_eq!(hash.len(), 32);

// Transaction ID (includes the signature in the hash)
let tx_id = transaction_id_hex(map)?;
assert_eq!(tx_id.len(), 64); // 32 bytes as uppercase hex
assert!(tx_id.chars().all(|c| c.is_ascii_hexdigit()));

Modules

definitions

Compile-time field definitions from definitions.json.

deserializer

Binary deserialization for XRPL objects.

error

Error types for the binary codec.

field_code

Field ID encoding and variable-length (VL) prefix encoding.

serializer

Canonical binary serialization for XRPL objects.

signing

Signing-specific serialization and transaction hashing.