gpru/babyjub-delta-cipher API

Source-derived exports, parameter and result types, public methods and source links.

This reference is generated from the checked-out TypeScript exports. Types and signatures describe the package contract; source presence does not establish deployment or service availability. Error expressions below are direct throws, not an exhaustive list of failures from dependencies.

Source module. See the reference index for package import boundaries and verification scope.

BabyJubPointV1

Import from @trustlink/tsn-sdk. Implementation, line 13.

export type BabyJubPointV1 = { x: bigint; y: bigint };

decodeBabyJubHexV1

Import from @trustlink/tsn-sdk. Implementation, line 143.

decodeBabyJubHexV1(value: string, label: string): bigint

Direct failure expressions:

new Error(`${label} must be 32-byte hex`)

decryptBalanceBlindingDeltaV1

Recover and authenticate the proof-bound blinding delta from a Memo prefix.

Import from @trustlink/tsn-sdk. Implementation, line 121.

decryptBalanceBlindingDeltaV1(params: { encryptedDelta: bigint; ephemeralPublicKey: BabyJubPointV1; scanSecret: bigint; }): bigint

Direct failure expressions:

new Error("GPRU encrypted delta or scan secret is outside the BabyJubjub scalar field")

deriveGpruBalanceScanKeyV1

Derive the private scan scalar and registered BabyJubjub point from the owner-held master seed.

Import from @trustlink/tsn-sdk. Implementation, line 86.

deriveGpruBalanceScanKeyV1(masterSeed: Uint8Array): { secret: bigint; publicKey: BabyJubPointV1; }

Direct failure expressions:

new Error("TIN master seed must contain at least 32 bytes")

encodeBabyJubFieldHexV1

Import from @trustlink/tsn-sdk. Implementation, line 133.

encodeBabyJubFieldHexV1(value: bigint): string

Direct failure expressions:

new Error("BabyJubjub coordinate is outside the base field")

encodeBabyJubKeyV1

Import from @trustlink/tsn-sdk. Implementation, line 148.

encodeBabyJubKeyV1(point: BabyJubPointV1): { x: Uint8Array; y: Uint8Array; }

encodeBabyJubScalarHexV1

Import from @trustlink/tsn-sdk. Implementation, line 138.

encodeBabyJubScalarHexV1(value: bigint): string

Direct failure expressions:

new Error("BabyJubjub scalar is outside the subgroup order")

encryptBalanceBlindingDeltaV1

Encrypt a BabyJubjub scalar using a fresh one-time ECDH point. C = delta + x(e*S) mod subgroup order.

Import from @trustlink/tsn-sdk. Implementation, line 97.

encryptBalanceBlindingDeltaV1(params: { delta: bigint; scanPublicKey: BabyJubPointV1; ephemeralScalar?: bigint; }): { encryptedDelta: bigint; ephemeralPublicKey: BabyJubPointV1; ephemeralScalar: bigint; }

Direct failure expressions:

new Error("GPRU blinding delta must be a nonzero BabyJubjub scalar")
new Error("GPRU delta ephemeral scalar is outside the BabyJubjub subgroup order")

isValidBabyJubPointV1

Import from @trustlink/tsn-sdk. Implementation, line 58.

isValidBabyJubPointV1(point: BabyJubPointV1): boolean