Hello, It looks like the trailing newline isn't stripped from the sequence count input anymore, which causes strtonum(3) to fail. To work around this problem in 5.8-stable, you can press Ctrl-D twice after typing in the sequence number.
I have also attached a patch for -current that fixes this issue and another issue where skeyinit needs more pledge(2)s when running skeyinit -s -a passwd as a regular user. Thanks, Serguey Index: skeyinit.c =================================================================== RCS file: /cvs/src/usr.bin/skeyinit/skeyinit.c,v retrieving revision 1.62 diff -u -p -r1.62 skeyinit.c --- skeyinit.c 20 Nov 2015 20:57:48 -0000 1.62 +++ skeyinit.c 29 Nov 2015 03:14:39 -0000 @@ -55,7 +55,7 @@ main(int argc, char **argv) struct skey skey; struct passwd *pp; - if (pledge("stdio rpath wpath cpath fattr flock tty", NULL) == -1) + if (pledge("stdio rpath wpath cpath fattr flock tty getpw proc exec", NULL) == -1) err(1, "pledge"); n = rmkey = hexmode = enable = 0; @@ -319,6 +319,7 @@ secure_mode(int *count, char *key, char SKEY_MAX_SEQ); (void)fgets(buf, bufsiz, stdin); clearerr(stdin); + rip(buf); n = strtonum(buf, 1, SKEY_MAX_SEQ-1, &errstr); if (!errstr) break; /* Valid range */