crypt.h File Reference

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Functions
char *	mbdyn_make_salt (char *salt, size_t saltlen, const char *salt_format)

Function Documentation

char* mbdyn_make_salt	(	char *	salt,
		size_t	saltlen,
		const char *	salt_format
	)

Definition at line 40 of file crypt.cc.

References ASSERT, buf, and STRLENOF.

Referenced by main().

{
        static char salt_charset[] =
                "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./";

        ASSERT(strlen(salt_charset) == 64);
        ASSERT(salt);
        ASSERT(saltlen > 2);

        char    buf[34];

#if defined(HAVE_DEV_RANDOM) || defined(HAVE_DEV_URANDOM)
        FILE *fin = NULL;

#if defined(HAVE_DEV_RANDOM)
        fin = fopen("/dev/random");
#elif defined(HAVE_DEV_URANDOM)
        fin = fopen("/dev/urandom");
#endif /* HAVE_DEV_RANDOM || HAVE_DEV_URANDOM */

        fread(buf, STRLENOF(buf), 1, fin);
        buf[STRLENOF(buf)] = '\0';
        fclose(fin);

        for (unsigned int i = 0; i < STRLENOF(buf); i++) {
                buf[i] = salt_charset[buf[i] % STRLENOF(salt_charset)];
        }
#else
        for (unsigned int i = 0; i < STRLENOF(buf); i++) {
                buf[i] = salt_charset[rand() % STRLENOF(salt_charset)];
        }
#endif

        if (salt_format) {
                snprintf(salt, saltlen, salt_format, buf);
        } else {
                strncpy(salt, buf, saltlen);
        }

        return salt;
}