41 lines
1.7 KiB
Python
41 lines
1.7 KiB
Python
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def ssn_check_digit(value):
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"Calculate Italian social security number check digit."
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ssn_even_chars = {
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'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9,
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'A': 0, 'B': 1, 'C': 2, 'D': 3, 'E': 4, 'F': 5, 'G': 6, 'H': 7, 'I': 8, 'J': 9,
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'K': 10, 'L': 11, 'M': 12, 'N': 13, 'O': 14, 'P': 15, 'Q': 16, 'R': 17, 'S': 18,
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'T': 19, 'U': 20, 'V': 21, 'W': 22, 'X': 23, 'Y': 24, 'Z': 25
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}
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ssn_odd_chars = {
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'0': 1, '1': 0, '2': 5, '3': 7, '4': 9, '5': 13, '6': 15, '7': 17, '8': 19, '9': 21,
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'A': 1, 'B': 0, 'C': 5, 'D': 7, 'E': 9, 'F': 13, 'G': 15, 'H': 17, 'I': 19, 'J': 21,
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'K': 2, 'L': 4, 'M': 18, 'N': 20, 'O': 11, 'P': 3, 'Q': 6, 'R': 8, 'S': 12,
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'T': 14, 'U': 16, 'V': 10, 'W': 22, 'X': 25, 'Y': 24, 'Z': 23
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}
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# Chars from 'A' to 'Z'
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ssn_check_digits = [chr(x) for x in range(65, 91)]
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ssn = value.upper()
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total = 0
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for i in range(0,15):
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try:
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if i % 2 == 0:
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total += ssn_odd_chars[ssn[i]]
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else:
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total += ssn_even_chars[ssn[i]]
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except KeyError:
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msg = "Character '%(char)s' is not allowed." % {'char': ssn[i]}
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raise ValueError(msg)
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return ssn_check_digits[total % 26]
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def vat_number_check_digit(vat_number):
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"Calculate Italian VAT number check digit."
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normalized_vat_number = str(vat_number).zfill(10)
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total = 0
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for i in range(0, 10, 2):
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total += int(normalized_vat_number[i])
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for i in range(1, 11, 2):
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quotient , remainder = divmod(int(normalized_vat_number[i]) * 2, 10)
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total += quotient + remainder
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return str((10 - total % 10) % 10)
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