BCrypt Calculation
Input Output BCcrypt Password Hashing

Password
Validate Hash

Bcrypt is a password hashing function designed by Niels Provos and David Mazières, based on the Blowfish cipher. BCrypt was first published, in 1999, they listed their implementation's based default cost factor,This is the core password hashing mechanism in the OpenBSD operating system

Workload (Cost Factor)
10
11
12
13
14
The bcrypt workload is specified in the above static variable, a value from 10 to 31. A workload of 12 is a very reasonable safe default as of 2013.

A bcrypt cost of 6 means 64 rounds (2^6 = 64).

for example given bcrypt hash Value
$2a$06$.rCVZVOThsIa97pEDOxvGuRRgzG64bvtJ0938xuqzv18d3ZpQhstC
$06$ specifies a cost parameter of 6, indicating 64 key expansion rounds
.rCVZVOThsIa97pEDOxvGu a 128-bit salt
RRgzG64bvtJ0938xuqzv18d3ZpQhstC is the resultinh hash

bcrypt Output size is fixed: 192 bits.

Good Password Hashing Functions
PBKDF2
bcrypt (Digest Size 184 bit)
scrypt (Digest Size variable )
OpenPGP Iterated And Salted S2K


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