bls12-381 3.0.3 · OCaml Package

BLS signatures instantiation minimizing the size of the public keys (48 bytes) but use longer signatures (96 bytes).

type pk

Type of the public keys

val pk_size_in_bytes : int

The size of a serialized value pk

val signature_size_in_bytes : int

The size of a serialized value signature

val unsafe_pk_of_bytes : Bytes.t -> pk

Build a value of type pk without performing any check on the input (hence the unsafe prefix because it might not give a correct inhabitant of the type pk). It is safe to use this function when verifying a signature as the signature function verifies if the point is in the prime subgroup. Using unsafe_pk_of_bytes removes a verification performed twice when used pk_of_bytes_exn or pk_of_bytes_opt.

The expected bytes format are the compressed form of a point on G1.

val pk_of_bytes_exn : Bytes.t -> pk

Build a value of type pk safely, i.e. the function checks the bytes given in parameters represents a point on the curve and in the prime subgroup. Raise Invalid_argument if the bytes are not in the correct format or does not represent a point in the prime subgroup.

The expected bytes format are the compressed form of a point on G1.

val pk_of_bytes_opt : Bytes.t -> pk option

Build a value of type pk safely, i.e. the function checks the bytes given in parameters represents a point on the curve and in the prime subgroup. Return None if the bytes are not in the correct format or does not represent a point in the prime subgroup.

The expected bytes format are the compressed form of a point on G1.

val pk_to_bytes : pk -> Bytes.t

Returns a bytes representation of a value of type pk. The output is the compressed form of the point G1.t the pk represents.

val derive_pk : sk -> pk

derive_pk sk derives the corresponding public key of sk.

type signature

Type of the signatures

val unsafe_signature_of_bytes : Bytes.t -> signature

Build a value of type signature without performing any check on the input (hence the unsafe prefix because it might not give a correct inhabitant of the type signature). It is safe to use this function when verifying a signature as the signature function verifies if the point is in the prime subgroup. Using unsafe_signature_of_bytes removes a verification performed twice when used signature_of_bytes_exn or signature_of_bytes_opt.

The expected bytes format are the compressed form of a point on G2.

val signature_of_bytes_exn : Bytes.t -> signature

Build a value of type signature safely, i.e. the function checks the bytes given in parameters represents a point on the curve and in the prime subgroup. Raise Invalid_argument if the bytes are not in the correct format or does not represent a point in the prime subgroup.

The expected bytes format are the compressed form of a point on G2.

val signature_of_bytes_opt : Bytes.t -> signature option

Build a value of type signature safely, i.e. the function checks the bytes given in parameters represents a point on the curve and in the prime subgroup. Return None if the bytes are not in the correct format or does not represent a point in the prime subgroup.

The expected bytes format are the compressed form of a point on G2.

val signature_to_bytes : signature -> Bytes.t

Returns a bytes representation of a value of type signature. The output is the compressed form of a point G2.t the signature represents.

val aggregate_signature_opt : signature list -> signature option

aggregate_signature_opt signatures aggregates the signatures signatures, following section 2.8. Return None if INVALID is expected in the specification

module Basic : sig ... end

Basic scheme described in section 3.1

module Aug : sig ... end

Augmentation scheme described in section 3.2

module Pop : sig ... end

Proof of possession scheme described in section 3.3

package bls12-381