Finnish Unique Identification Number Control Character Calculator

Calculate a valid control character for an incomplete Finnish Unique Identification Number (FINUID, or sähköinen asiointitunnus SATU).

Usage

satu_control_char(pin, print.full = FALSE)

Arguments

pin

An incomplete FINUID that has 8 first numbers.

print.full

Should the function print only the whole FINUID-number (TRUE) or only the control character (FALSE). Default is FALSE.

Value

Control character, either a number 0-9 or a letter (length 1 character). If parameter print.full is set to TRUE, the function returns a complete FINUID / SATU number (length 9 characters).

Details

This method of calculating the control character was devised by mathematician Erkki Pale (1962) to detect input errors but also to detect errors produced by early punch card machines. The long number produced by writing the birth date and the personal number together are divided by 31 and the remainder is used to look up the control character from a separate table containing alphanumeric characters except letters G, I, O, Q and Z.

The method of calculating the control character does not need century character and therefore the function has an option to omit it.

See also

For more detailed information about FINUID, see Finnish Digital and population data services agency website: https://dvv.fi/en/citizen-certificate-and-electronic-identity

Author

Pyry Kantanen

Examples

# The first assigned FINUID number, 10000001N.
satu_control_char("10000001")
#> [1] "N"