tree 1505ad26fc8078c7fa6e0bd427d4e6f2ef9941c6
parent 54309f17f35169e9f4b617b98fec43f6ac6507e1
author Vishwanatha Subbanna <vishwa@linux.vnet.ibm.com> 1504678162 +0530
committer Vishwanatha Subbanna <vishwa@linux.vnet.ibm.com> 1505287479 +0530

Extract crypto algorithm field and add utility functions

Password field of a user in /etc/shadow contains 3 parts:
[Crypt algorithm, Salt, encrypted password]

Example: A value of "1" in crypt algorithm maps to MD5

Need to use the same crypt algorithm that is already used
before when the new password is to be updated.

Change-Id: Ib7d8e0ad6f3bcce30f5c2be89b4e033230c07bf4
Signed-off-by: Vishwanatha Subbanna <vishwa@linux.vnet.ibm.com>