[Dovecot] SHA512-CRYPT scheme fails password verification

[Jouko Nikula]

Hello,

If I try to use the crypt schemes provided by libc. I fail as follows:

jnikula at jlaptop:~/$ doveadm pw -s SHA512-CRYPT -p 123456
{SHA512-CRYPT}$6$to2umWLDtqvzS8SV$ZGpBeGNKuUN/2HKG6I2BEAt.Gzrz/y.SZDkos2GT2ik8obnp3XCFWfVsKVriJa6jjHULmLIqCSSyaF5YrTH7u.
jnikula at jlaptop:~/$ doveadm pw -t
{SHA512-CRYPT}$6$to2umWLDtqvzS8SV$ZGpBeGNKuUN/2HKG6I2BEAt.Gzrz/y.SZDkos2GT2ik8obnp3XCFWfVsKVriJa6jjHULmLIqCSSyaF5YrTH7u.
-p 123456
doveadm(jnikula): Fatal: reverse password verification check failed:
Password mismatch

Using SHA512 sum scheme (-s SHA512) works ok in the same manner.

I have dovecot version 2.2.9 on Linux 3.11.0-14-generic x86_64 Ubuntu
13.10 and I get the same results on 32-bit Debian as well. Does anyone
have idea what's wrong?

Thanks in advance,
Jouko Nikula