Which package would be suitable for password.el?

I'd like to sync the sieve package against recent Gnus, but I realized the Gnus version now uses password.el. I don't think the "sieve" package is the right package for password.el. Any suggestions for more appropriate packages? Some ideas: mail-lib: it is mostly used by mail packages (sieve, pgg, gnus...). net-utils: it feels like a network utility to me, but it doesn't seem to fit well with the other files already in net-utils. ecrypto: it is sort of crypto related. os-utils: the files in there, telnet, rlogin etc, do alot of password handling. A pragmatic solution would be to look at the packages that might want to use password.el, and see what the REQUIRES are, to find a suitable place to put it in, without having to modify REQUIRES in those packages. So: sieve: mail-lib or sasl pgg: no appropriate package sasl: ecrypto gnus: well, most packages, including mail-lib, sasl, ecrypto. I lean towards putting password.el in ecrypto. My reason is that all packages that might need password.el already depend on ecrypto, except pgg, but adding ecrypto as a dependency to pgg seems rather lightweight because ecrypto doesn't depend on anything. Certainly more lightweight than adding mail-lib as dependency to pgg. Opinions?