import hashlib
def cal_bin_hash(buf):
sha256_hash = hashlib.sha256()
sha256_hash.update(buf)
return sha256_hash.digest()
def cal_image_hash(f):
sha256_hash = hashlib.sha256()
for byte_block in iter(lambda: f.read(4096), b""):
sha256_hash.update(byte_block)
f.seek(0)
return sha256_hash.digest()
def to_bytes(n, length, endianness='big'):
h = '%x' % n
s = ('0' * (len(h) % 2) + h).zfill(length * 2).decode('hex')
return s if endianness == 'big' else s[::-1]
def get_filelen(f):
f.seek(0, 2)
length = f.tell()
f.seek(0)
return length
