#Checkr

A secure way of storing passwords and other sensitive identification information on a database is to store the checksums of the data, instead of storing the data itself. If a database is hacked or otherwise inappropriately accessed, only the checksums can be obtained, making it very hard to discover the actual password used to login. When a login is requested, the checksums of the login password and the password stored in the database can be compared. Checkr provides a simple interface for verifying passwords, whose checksum objects or individual checksums can be easily stored on and read from a database. Checkr has been fully optimized at the ease of the V8 engine.

##Include Checkr

var checkr = require('checkr');

##Create a Checkr hash object

var phash = checkr('password');

##Checkr hash levels

1: 'md4',
2: 'md5',
4: 'sha',
8: 'sha1',
16: 'sha224',
32: 'sha256',
64: 'sha384',
128: 'sha512'

The hashtypes can be used as bitfields, to customize verification. Note: sha is sha-0.

Examples:
255:		full check
1 | 2:		md4 and md5
16 | 32: 	sha224 and sha256
2 | 8:		md5 and sha1

The standard (default) hashtype is 10, which uses md5 and sha1 to verify.

Hastypes can be passed in as a second argument to the checkr module.

##Checkr verify hash objects

phash._(qhash);

Returns a boolean, representing whether the objects are hash-equivalent.

##Example

var checkr = require('checkr');
var phash = checkr('password');
phash._(checkr('password')); // Returns true
phash._(checkr('spassword')); // Returns false

##Clarification

During benchmarking, checkr was shown to slow down greatly if the module itself was used as a function. Therefore the function checkr#_ was implemented in production.

##Speedtest

True Cases
1 Million Comprehensive Checks - Cached: 0 s, 314.317 ms
1 Million Standard Checks - Cached: 0 s, 86.000 ms
1 Million Basic Checks - Cached: 0 s, 48.131 ms

1 Thousand Comprehensive Checks - Cached: 0 s, 0.342 ms
1 Thousand Standard Checks - Cached: 0 s, 0.094 ms
1 Thousand Basic Checks - Cached: 0 s, 0.056 ms

1 Thousand Comprehensive Checks - Evaluated: 0 s, 210.983 ms
1 Thousand Standard Checks - Evaluated: 0 s, 67.534 ms
1 Thousand Basic Checks - Evaluated: 0 s, 15.228 ms

False Cases
1 Million Comprehensive Checks - Cached: 0 s, 52.174 ms
1 Million Standard Checks - Cached: 0 s, 51.852 ms
1 Million Basic Checks - Cached: 0 s, 51.580 ms

1 Thousand Comprehensive Checks - Cached: 0 s, 0.057 ms
1 Thousand Standard Checks - Cached: 0 s, 0.055 ms
1 Thousand Basic Checks - Cached: 0 s, 0.181 ms

1 Thousand Comprehensive Checks - Evaluated: 0 s, 195.526 ms
1 Thousand Standard Checks - Evaluated: 0 s, 40.295 ms
1 Thousand Basic Checks - Evaluated: 0 s, 40.676 ms