#!/usr/bin/env python3

"""
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
"""

import os
import sys

sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))

import amcl.core_utils
import amcl.bls

if __name__ == "__main__":
    # Print hex values
    DEBUG = False

    # Seed
    seed_hex = "78d0fb6705ce77dee47d03eb5b9c5d30"
    seed = bytes.fromhex(seed_hex)

    # Message
    message = b"test message"

    # random number generator
    rng = amcl.core_utils.create_csprng(seed)

    # Generate key pairs
    rtn, sk1, pktmp = amcl.bls.key_pair_generate(rng)
    if rtn != 0:
        print("Error: key_pair_generate {}".format(rtn))
        raise SystemExit(0)
    print("sk1: {}".format(sk1.hex()))
    print("pktmp: {}".format(pktmp.hex()))

    rtn, sk1, pk1 = amcl.bls.key_pair_generate(rng, sk1)
    if rtn != 0:
        print("Error: key_pair_generate {}".format(rtn))
        raise SystemExit(0)
    print("sk1: {}".format(sk1.hex()))
    print("pk1: {}".format(pk1.hex()))

    rtn, sk2, pk2 = amcl.bls.key_pair_generate(rng)
    if rtn != 0:
        print("Error: key_pair_generate {}".format(rtn))
        raise SystemExit(0)
    print("sk2: {}".format(sk2.hex()))
    print("pk2: {}".format(pk2.hex()))

    rtn, sk3, pk3 = amcl.bls.key_pair_generate(rng)
    if rtn != 0:
        print("Error: key_pair_generate {}".format(rtn))
        raise SystemExit(0)
    print("sk3: {}".format(sk3.hex()))
    print("pk3: {}".format(pk3.hex()))

    # Sign and verify
    rtn, sig1 = amcl.bls.sign(message, sk1)
    if rtn != 0:
        print("Error: sign {}".format(rtn))
        raise SystemExit(0)
    print("sig1: {}".format(sig1.hex()))

    rtn = amcl.bls.verify(sig1, message, pk1)
    if rtn != 0:
        print("Error: Invalid signature {}".format(rtn))
        raise SystemExit(0)
    print("Success: Signature is valid")

    rtn, sig2 = amcl.bls.sign(message, sk2)
    if rtn != 0:
        print("Error: sign {}".format(rtn))
        raise SystemExit(0)
    print("sig2: {}".format(sig2.hex()))

    rtn = amcl.bls.verify(sig2, message, pk2)
    if rtn != 0:
        print("Error: Invalid signature {}".format(rtn))
        raise SystemExit(0)
    print("Success: Signature is valid")

    rtn, sig3 = amcl.bls.sign(message, sk3)
    if rtn != 0:
        print("Error: sign {}".format(rtn))
        raise SystemExit(0)
    print("sig3: {}".format(sig3.hex()))

    rtn = amcl.bls.verify(sig3, message, pk3)
    if rtn != 0:
        print("Error: Invalid signature {}".format(rtn))
        raise SystemExit(0)
    print("Success: Signature is valid")

    # Add Signatures
    rtn, sig12 = amcl.bls.add_G1(sig1, sig2)
    if rtn != 0:
        print("Error: add_G1 {}".format(rtn))
        raise SystemExit(0)
    print("sig12: {}".format(sig12.hex()))

    rtn, sig123 = amcl.bls.add_G1(sig12, sig3)
    if rtn != 0:
        print("Error: add_G1 {}".format(rtn))
        raise SystemExit(0)
    print("sig123: {}".format(sig123.hex()))

    # Add Public keys
    rtn, pk12 = amcl.bls.add_G2(pk1, pk2)
    if rtn != 0:
        print("Error: add_G2 {}".format(rtn))
        raise SystemExit(0)
    print("pk12: {}".format(pk12.hex()))

    rtn, pk123 = amcl.bls.add_G2(pk12, pk3)
    if rtn != 0:
        print("Error: add_G2 {}".format(rtn))
        raise SystemExit(0)
    print("pk123: {}".format(pk123.hex()))

    # Verify aggretated values
    rtn = amcl.bls.verify(sig123, message, pk123)
    if rtn != 0:
        print("Error: Invalid aggregated signature {}".format(rtn))
        raise SystemExit(0)
    print("Success: Aggregated signature is valid")

    # Clear memory
    amcl.core_utils.kill_csprng(rng)
    del sk1
    del pk1
    del sk2
    del pk2
    del sk3
    del pk3