import yaml
import sys
import os
import subprocess
import hashlib

"""
For a given SCHEME, this script verifies that the hash of the testvectors
produced on this platform matches the one provided in the META file.
"""

if len(sys.argv) != 2:
    print("Provide a scheme name (e.g. crypto_kem/kyber768) as argv[1]")
    exit(1)

SCHEME = sys.argv[1]
SCHEMEFULL = SCHEME.replace('/', '_')  # e.g. crypto_kem_kyber768
SCHEMESHORT = SCHEME.split('/')[1].upper()


def get_hash(scheme):
    with open("{}/META.yml".format(scheme), 'r') as stream:
        meta = yaml.load(stream)
        return meta['testvectors-sha256']


expectedTestvectorsHash = get_hash(SCHEME)

subprocess.run(["make", "testvectors", "SCHEME={}".format(SCHEME)])
implementations = [
    x for x in os.listdir('bin') if 'testvectors' in x and SCHEMEFULL in x]

for impl in implementations:
    testvectors = subprocess.run(["bin/{}".format(impl)],
                                 stdout=subprocess.PIPE)
    testvectorsHash = hashlib.sha256(testvectors.stdout).hexdigest()
    if testvectorsHash.lower() != expectedTestvectorsHash.lower():
        print("testvectors of {} should be {}, but is {}"
              .format(SCHEME, expectedTestvectorsHash, testvectorsHash))
        sys.exit(1)
    else:
        print("testvectors of {} matched expected hash".format(SCHEME))