SmartAccountAuth

Authentication utilities for Smart Account authorization entries.

Provides functions to sign authorization entries and build authentication payload hashes for Smart Account transactions. These utilities handle the complex XDR encoding and signature map construction required by the Soroban authorization protocol.

Key responsibilities:

• Building Soroban authorization payload hashes for WebAuthn challenges

• Signing authorization entries with Smart Account signers

• Managing signature expiration and map entry ordering

• Variant-specific encoding of signature values per SmartAccountSignature.toAuthPayloadBytes

Example usage:

// Build payload hash for WebAuthn signing
val payloadHash = SmartAccountAuth.buildAuthPayloadHash(
    entry = authEntry,
    expirationLedger = currentLedger + 100u,
    networkPassphrase = Network.TESTNET.networkPassphrase
)

// Compute the signature over the payload hash, then attach it to the entry
val signedEntry = SmartAccountAuth.signAuthEntry(
    entry = authEntry,
    signer = webAuthnSigner,
    signature = webAuthnSignature,
    expirationLedger = currentLedger + 100u
)