Files
bridge/go.sum
T
zeekay fbbb9639a9 feat(xrpl): Payment codec + address derivation + DER low-s signature
Introduces internal/xrpl, the bridge's XRP Ledger primitives package:

- AddressFromPubKey / AccountIDFromPubKey: derive the canonical r-address
  from a 33-byte compressed-secp256k1 public key. Hash chain is
  RIPEMD160(SHA256(pubkey)), base58check-encoded with the XRPL alphabet
  + 0x00 version byte. Round-trips through the rubblelabs codec.
- PreSign(PaymentUnsigned) → (32-byte digest, *SignCtx): builds a native
  XRP Payment, embeds the signing pubkey on the wire, returns the
  SHA-512Half of (0x53545800 || serialized_body) — exactly the message
  the MPC quorum must sign.
- Finalize(DER, *SignCtx) → (signedBlob, txHash): attaches the DER
  signature to TxnSignature, returns the full wire-format binary blob
  (suitable for submit's tx_blob param as hex) and the canonical XRPL
  tx hash (SHA-512Half of 0x54584E00 || blob).
- EncodeDERSignature(r, s): ASN.1 DER encode (r, s) with low-s
  normalization (rejects high-s as XRPL's tfFullyCanonicalSig requires)
  and the 0x00 leading-byte rule for INTEGERs with the MSB set.
- CanonicalizeS / SHA512Half exposed for tests + future TrustSet path.

Uses github.com/rubblelabs/ripple for the deep binary codec — every
field-id, type-byte, and length-prefix detail is the library's
responsibility. The bridge owns only the signing flow on top, so MPC
ECDSA can stand in for the library's local-key Sign helper.

Tests cover: canonical pubkey → r-address round-trip, rejection of
bad pubkey lengths/prefixes, DER encoding of standard and high-bit
cases, low-s flip for s > N/2, validation that high-s gets canonicalized
in EncodeDERSignature, PreSign digest matching independent SHA512Half
recomputation, full PreSign → Finalize round-trip via the parser.
2026-05-27 17:54:07 -07:00

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