Add Ed25519-to-X25519 WASM functions for session key vault access#26
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Add Ed25519-to-X25519 WASM functions for session key vault access#26
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Adds two new WASM-exported functions that enable Ed25519 session keys to participate in vault encryption without requiring a wallet signature: - vault_ed25519_seed_to_x25519: Converts Ed25519 seed to X25519 key pair via SHA-512 derivation (standard Ed25519→X25519 conversion) - vault_ed25519_pub_to_x25519: Converts Ed25519 public key to X25519 public key via Edwards→Montgomery birational map This allows share link recipients (who only have a session key) to derive the X25519 keys needed for vault grant decryption, removing the requirement for a wallet signature to access shared encrypted content.
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Summary
vault_ed25519_seed_to_x25519()— converts Ed25519 seed to X25519 key pair via SHA-512 (standard conversion)vault_ed25519_pub_to_x25519()— converts Ed25519 public key to X25519 via Edwards→Montgomery birational mapcurve25519-dalekdependency for the public key point conversionThese enable session keys (Ed25519, embedded in share tokens) to derive X25519 keys for vault grant operations, removing the requirement for wallet signatures when accessing shared encrypted content.
Test plan
cargo check --target wasm32-unknown-unknownpassescargo testin tinycloud-sdk-wasm passesvault_ed25519_pub_to_x25519correctly maps known Ed25519 public keys to their X25519 equivalents