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from .binary import intFromHex, hexFromInt
def oidFromHex(hexadecimal):
firstByte, remainingBytes = hexadecimal[:2], hexadecimal[2:]
firstByteInt = intFromHex(firstByte)
oid = [firstByteInt // 40, firstByteInt % 40]
oidInt = 0
while len(remainingBytes) > 0:
byte, remainingBytes = remainingBytes[0:2], remainingBytes[2:]
byteInt = intFromHex(byte)
if byteInt >= 128:
oidInt = (128 * oidInt) + (byteInt - 128)
continue
oidInt = (128 * oidInt) + byteInt
oid.append(oidInt)
oidInt = 0
return oid
def oidToHex(oid):
hexadecimal = hexFromInt(40 * oid[0] + oid[1])
for number in oid[2:]:
hexadecimal += _oidNumberToHex(number)
return hexadecimal
def _oidNumberToHex(number):
hexadecimal = ""
endDelta = 0
while number > 0:
hexadecimal = hexFromInt((number % 128) + endDelta) + hexadecimal
number //= 128
endDelta = 128
return hexadecimal or "00"
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