Module traits

Signer Traits for the Spark Wallet SDK

This module defines the trait interfaces for the signing system in Spark. The signing system is a critical component that handles all cryptographic operations including key management, ECDSA signing, FROST threshold signing, and secure key derivation.

Trait Architecture

The signer follows a modular trait-based design:

• SparkSigner - The main trait that composes all sub-traits
• SparkSignerDerivationPath - Key derivation path handling using Spark’s custom path scheme
• SparkSignerEcdsa - ECDSA signature operations for identity verification
• SparkSignerEcies - Encryption/decryption of secret keys between parties
• SparkSignerFrost - FROST nonce and commitment management for threshold signing
• SparkSignerFrostSigning - FROST threshold signature operations
• SparkSignerSecp256k1 - Secp256k1 keypair management
• SparkSignerShamir - Verifiable secret sharing for secure key distribution

This design allows for flexible implementation of different signing backends while ensuring all required cryptographic operations are supported.

Implementation

The SDK provides a default implementation DefaultSigner that manages keys in memory. Users can implement custom signers for specialized needs such as hardware security modules or remote signing services.

Modules

derivation_path

Key derivation path handling for Spark wallet

ecdsa

ECDSA signing operations for Spark wallet

ecies

ECIES encryption operations for Spark wallet

frost

FROST Nonce Management for Threshold Signatures

frost_signing

FROST threshold signing operations for Spark wallet

secp256k1

Secp256k1 Keypair Management for Spark Wallet

shamir

Shamir’s Secret Sharing for Spark Wallet

Traits

SparkSigner

The main signer trait that aggregates all cryptographic capabilities required for the Spark wallet.