Which string encryption method to choose in the following example?

Question

PHP

I offer several variations of encrypted strings:

0000 = 4V5Q10o4M3vLe7Bx41y5M67n+CY=
0 = DFXbU4Z/oPur4IuKhk1fUl4910M=
1111 = ZqNSHv3VnboozSguaUfYUwqO9Vg=
password = rnqBiufuMKYb3WV5c/XmEu01dgw=

Is it possible to determine the encryption algorithm from such data?

Answer 1

Base64, each line is 27 characters long, 27*6/8 = 20 bytes = 160 bits binary value, possibly SHA-1. Since sha1('0') does not directly match decode_base64('DFXbU4Z/oPur4IuKhk1fUl4910M='), a salt must have been used.

Answer 2

The output seems to be base64, but not from the original data, which means that the original data is being processed by something else.

Answer 3

Are you sure that these are the encrypted strings, and not a hash function from these strings? Pretty sure it's a one-way hash.