FreeCalypso > hg > fc-pcsc-tools
changeset 162:274bfd8bccd0
libutil: ICCID Luhn function implemented
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Fri, 26 Feb 2021 21:16:45 +0000 |
| parents | 884b93362449 |
| children | 4cd2023f56a6 |
| files | libutil/Makefile libutil/iccid_luhn.c |
| diffstat | 2 files changed, 28 insertions(+), 1 deletions(-) [+] |
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--- a/libutil/Makefile Fri Feb 26 21:10:26 2021 +0000 +++ b/libutil/Makefile Fri Feb 26 21:16:45 2021 +0000 @@ -2,7 +2,7 @@ CFLAGS= -O2 OBJS= alpha_decode.o alpha_fromfile.o alpha_valid.o decimal_str.o \ filesearch.o gsm7_decode.o gsm7_encode.o gsm7_encode_table.o \ - gsm7_unpack.o hexdigits.o hexread.o hexstr.o nibbles2asc.o \ + gsm7_unpack.o hexdigits.o hexread.o hexstr.o iccid_luhn.o nibbles2asc.o\ number_decode.o number_encode.o pinentry.o plmncodes.o revnibbles.o \ shorthand.o LIB= libutil.a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libutil/iccid_luhn.c Fri Feb 26 21:16:45 2021 +0000 @@ -0,0 +1,27 @@ +/* + * This module implements a function for computing the Luhn check digit + * for ICCIDs that follow the 18+1 convention. + */ + +#include <sys/types.h> + +compute_iccid_luhn(digits) + u_char *digits; +{ + int i, dig, sum; + + sum = 0; + for (i = 0; i < 18; i++) { + dig = digits[i]; + if (i & 1) { + dig *= 2; + if (dig > 9) + dig -= 9; + } + sum += dig; + } + dig = sum % 10; + if (dig) + dig = 10 - dig; + return dig; +}