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wscutil: Add wsc_pin_generate

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This commit is contained in:
Denis Kenzior 2017-02-17 12:27:13 -06:00
parent 7440b5e98d
commit 230a4f4bab
2 changed files with 22 additions and 0 deletions
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21
src/wscutil.c
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@ -27,6 +27,7 @@
#include <stdbool.h> #include <stdbool.h>
#include <stdarg.h> #include <stdarg.h>
#include <errno.h> #include <errno.h>
#include <stdio.h>
#include <ell/ell.h> #include <ell/ell.h>
@ -2559,3 +2560,23 @@ bool wsc_pin_is_checksum_valid(const char *pin)
char digit = compute_check_digit(pin); char digit = compute_check_digit(pin);
return pin[7] == digit; return pin[7] == digit;
} }
/*
* Generate an 8 character PIN string into buffer given by @pin. @pin must be
* at least 9 bytes long to account for the nul character.
*/
bool wsc_pin_generate(char *pin)
{
uint32_t random;
bool ok;
ok = l_getrandom(&random, sizeof(random));
if (!ok)
return ok;
snprintf(pin, 8, "%07u", random);
pin[7] = compute_check_digit(pin);
pin[8] = '\0';
return true;
}

1
src/wscutil.h
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@ -640,3 +640,4 @@ bool wsc_kdf(const void *kdk, void *output, size_t size);
bool wsc_pin_is_valid(const char *pin); bool wsc_pin_is_valid(const char *pin);
bool wsc_pin_is_checksum_valid(const char *pin); bool wsc_pin_is_checksum_valid(const char *pin);
bool wsc_pin_generate(char *pin);