Add validation for Kazakhstani TINs

stdnum/kz/__init__.py

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+# __init__.py - collection of Kazakhstan numbers
+# coding: utf-8
+#
+# Copyright (C) 2022 Leandro Regueiro
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, see <https://www.gnu.org/licenses/>.
+
+"""Collection of Kazakhstan numbers."""
+
+# provide aliases
+from stdnum.kz import bin as vat  # noqa: F401

stdnum/kz/bin.py

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+# bin.py - functions for handling Kazakhstan BIN numbers
+# coding: utf-8
+#
+# Copyright (C) 2022 Leandro Regueiro
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, see <https://www.gnu.org/licenses/>.
+
+"""BIN or "БСН" (Business Identification Number, "бизнес-сәйкестендіру нөмірі",
+Kazakhstan tax number).
+
+This number consists of 12 digits and consists of five parts:
+
+* First part: consists of 4 digits representing the year (the last two digits)
+  and month of registration or re-registration.
+* Second part: consists of 1 digit representing the type of legal entity or
+  individual entrepreneur (C):
+    4 - for resident legal entities;
+    5 - for non-resident legal entities;
+    6 - for IP (C).
+* Third part: consists of 1 digit providing additional information:
+    0 - head unit of a legal entity or individual entrepreneur (S);
+    1 - branch of a legal entity or individual entrepreneur (S);
+    2 - representation of a legal entity or individual entrepreneur (S);
+    3 - a peasant (farm) farm operating on the basis of joint entrepreneurship.
+* Fourth part: consists of 5 digits and is a serial number.
+* Fifth part: consists of 1 check digit.
+
+More information:
+
+* https://www.oecd.org/tax/automatic-exchange/crs-implementation-and-assistance/tax-identification-numbers/Kazakhstan-TIN.pdf
+
+>>> validate('940140000385')
+'940140000385'
+>>> validate('990 140 004 654')
+'990140004654'
+>>> validate('12345')
+Traceback (most recent call last):
+    ...
+InvalidLength: ...
+>>> validate('12345678901X')
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+>>> validate('949940000385')
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+>>> validate('940190000385')
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+>>> validate('940149000385')
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+>>> validate('940140000386')
+Traceback (most recent call last):
+    ...
+InvalidChecksum: ...
+>>> format('990 140 004 654')
+'990140004654'
+"""  # noqa: E501
+
+from stdnum.exceptions import *
+from stdnum.kz.iin import calc_check_digit
+from stdnum.util import clean, isdigits
+
+
+def compact(number: str) -> str:
+    """Convert the number to the minimal representation.
+
+    This strips the number of any valid separators and removes surrounding
+    whitespace.
+    """
+    return clean(number, ' ')
+
+
+def validate(number: str) -> str:
+    """Check if the number is a valid Kazakhstan BIN number.
+
+    This checks the length and formatting.
+    """
+    number = compact(number)
+    if len(number) != 12:
+        raise InvalidLength()
+    if not isdigits(number):
+        raise InvalidFormat()
+    if int(number[2:4]) not in (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12):
+        raise InvalidComponent()
+    if number[4] not in ('4', '5', '6'):
+        raise InvalidComponent()
+    if number[5] not in ('0', '1', '2', '3'):
+        raise InvalidComponent()
+    if calc_check_digit(number[:-1]) != number[-1]:
+        raise InvalidChecksum()
+    return number
+
+
+def is_valid(number: str) -> bool:
+    """Check if the number is a valid Kazakhstan BIN number."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False
+
+
+def format(number: str) -> str:
+    """Reformat the number to the standard presentation format."""
+    return compact(number)

stdnum/kz/iin.py

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+# iin.py - functions for handling Kazakhstani individual identification numbers
+# coding: utf-8
+#
+# Copyright (C) 2026 Luca Sicurello
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, see <https://www.gnu.org/licenses/>.
+
+"""IIN (ЖСН, Жеке сәйкестендіру нөмірі, Kazakhstani Individual identification number).
+
+It is a 12-digit number of which the first 6 digits denote the person's
+birth date in the format YYMMDD, the next digit encodes the gender and
+century of birth, the next four digits represent a birth serial number
+and the last digit is a check digit.
+
+* https://www.gov.kz/article/648?lang=kk
+* https://ru.wikipedia.org/wiki/Индивидуальный_идентификационный_номер
+
+
+>>> compact('921029 35085 1')
+'921029350851'
+>>> validate('921029350851')
+'921029350851'
+>>> get_birth_date('921029350851')
+datetime.date(1992, 10, 29)
+>>> validate('92102B50851')  # invalid digit
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+>>> validate('921529350859')  # invalid date
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+"""
+
+from __future__ import annotations
+
+import datetime
+
+from stdnum.exceptions import *
+from stdnum.util import clean, isdigits
+
+
+def compact(number: str) -> str:
+    """Convert the number to the minimal representation.
+
+    This strips the number of any valid separators and removes surrounding
+    whitespace.
+    """
+    return clean(number, ' ')
+
+
+def calc_check_digit(number: str) -> str:
+    """Calculate the check digit. The number passed should not have
+    the check digit included."""
+    s = sum(w * int(n) for w, n in zip(range(1, 12), number[:11])) % 11
+    if s != 10:
+        return str(s)
+
+    s = sum(w * int(n) for w, n in zip(range(3, 14), number[:11])) % 11
+    if s != 10:
+        return str(s)
+
+    raise InvalidComponent()
+
+
+def get_birth_date(number: str) -> datetime.date:
+    """Get the birth date from the person's Individual identification number."""
+    number = compact(number)
+    year = int(number[0:2])
+    month = int(number[2:4])
+    day = int(number[4:6])
+
+    if number[6] == '0':  # no century info for foreign nationals
+        today = datetime.date.today()
+        year += (today.year // 100) * 100
+        if year >= today.year:
+            year -= 100
+
+    elif number[6] in '12':
+        year += 1800
+    elif number[6] in '34':
+        year += 1900
+    elif number[6] in '56':
+        year += 2000
+    else:
+        raise InvalidComponent()
+
+    try:
+        return datetime.date(year, month, day)
+    except ValueError:
+        raise InvalidComponent()
+
+
+def get_gender(number: str) -> str | None:
+    """Get the gender of the person's Individual identification number."""
+    number = compact(number)
+    if number[6] == '0':
+        return None
+    elif int(number[6]) % 2:
+        return 'M'
+    else:
+        return 'F'
+
+
+def validate(number: str) -> str:
+    """Check if the given Individual identification number is valid.
+    This checks the length and whether the check digit is correct."""
+    number = compact(number)
+    if not isdigits(number):
+        raise InvalidFormat()
+    if len(number) != 12:
+        raise InvalidLength()
+    if get_birth_date(number) > datetime.date.today():
+        raise InvalidComponent()
+    if calc_check_digit(number[:-1]) != number[-1]:
+        raise InvalidChecksum()
+    return number
+
+
+def is_valid(number: str) -> bool:
+    """Check if the given Individual identification number is valid."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False