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from eth_typing import (
BLSPubkey,
BLSSignature,
)
from py_ecc.optimized_bls12_381 import (
curve_order,
is_inf,
multiply,
)
from py_ecc.typing import (
Optimized_Field,
Optimized_Point3D,
)
from .hash import (
i2osp,
os2ip,
)
from .point_compression import (
compress_G1,
compress_G2,
decompress_G1,
decompress_G2,
)
from .typing import (
G1Compressed,
G1Uncompressed,
G2Compressed,
G2Uncompressed,
)
def subgroup_check(P: Optimized_Point3D[Optimized_Field]) -> bool:
return is_inf(multiply(P, curve_order))
def G2_to_signature(pt: G2Uncompressed) -> BLSSignature:
z1, z2 = compress_G2(pt)
return BLSSignature(i2osp(z1, 48) + i2osp(z2, 48))
def signature_to_G2(signature: BLSSignature) -> G2Uncompressed:
p = G2Compressed((os2ip(signature[:48]), os2ip(signature[48:])))
signature_point = decompress_G2(p)
return signature_point
def G1_to_pubkey(pt: G1Uncompressed) -> BLSPubkey:
z = compress_G1(pt)
return BLSPubkey(i2osp(z, 48))
def pubkey_to_G1(pubkey: BLSPubkey) -> G1Uncompressed:
z = os2ip(pubkey)
return decompress_G1(G1Compressed(z))
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