feat: implement confidential payment helpers for Pedersen commitment generation and reveal#430
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…tion and reveal Implements Issue Stellar-split#420 - Confidential payment helpers using Pedersen commitments: - generateCommitment(amount): Generates cryptographic Pedersen commitment - verifyCommitment(): Verifies commitment matches value and blinding factor - storeBlindingFactor(): Encrypts and stores blinding factor in IndexedDB - loadBlindingFactor(): Decrypts and retrieves stored blinding factor - buildRevealTransaction(): Builds reveal_payment contract call - Convenience functions: generateAndStoreCommitment, buildRevealTransactionFromStorage Features: - Uses secp256k1 curve via @noble/curves for elliptic curve operations - Session-based AES-256-GCM encryption for blinding factor storage - Supports IndexedDB with localStorage fallback - Tamper detection for modified values or blinding factors - 31 comprehensive tests covering roundtrip verification
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Summary
Implements Issue #420 - Confidential payment helpers for Pedersen commitment generation and reveal.
New Functions:
generateCommitment(amount): Generates cryptographic Pedersen commitment (C = aH + vG)verifyCommitment(): Verifies commitment matches value and blinding factorstoreBlindingFactor(): Encrypts and stores blinding factor in IndexedDB/localStorageloadBlindingFactor(): Decrypts and retrieves stored blinding factordeleteBlindingFactor(): Removes stored blinding factorbuildRevealTransaction(): Builds reveal_payment contract callgenerateAndStoreCommitment(): Convenience function combining generation and storagebuildRevealTransactionFromStorage(): Convenience function for reveal flowFeatures:
@noble/curvesfor elliptic curve operationsNew Error Types:
CommitmentGenerationErrorBlindingFactorStorageErrorBlindingFactorNotFoundErrorBlindingFactorDecryptionErrorTest plan
Closes #420