Hashes don't match hashlib

[kellieotto]

The following test fails. It's a variant on the test in test_sha256.py. Basically instead of creating a new message at each step, I append a byte to the previous message at each step.

from sha256 import sha256 as c_sha256, sha256rand
from hashlib import sha256

print('Verifying integrity of hashes between Python and C SHA256:')

const_byte = bytes(1)
message = b"counter"
for i in range(1000):
    message = message+const_byte
    result0 = c_sha256(message)

    s = sha256()
    s.update(message)
    result1 = s.digest()

    assert result0 == result1
    print('.', end='')