# pbkdf2

PBKDF2 hashing for Bash

## USAGE

```
$ bash pbkdf2.sh hashtype salt password iterations {raw/full/rawfull}
```

or

```
$ ./pbkdf2.sh hashtype salt password iterations {raw/full/rawfull}
```

### hashtype *string*

Options: md5, sha1, sha224, sha256, sha384, sha512, blake2b, blake2s, sha3_224, sha3_256, sha3_384, sha3_512, shake_128, shake_256

### salt *string*

This must be a predefind string of A-Z, a-z and 0-9.

### password *string*

The password you want hashed.

### iterations *integer*

Range 1 to 2147483647. The higher the integer the more secure but at the cost of time.

### {raw/full/rawfull} *optional*

This is optional. By default you will get a hash string followed by a new line. If you do not want the new line, say to use in a variable, then use 'raw' to get just the hash in hex. However if you use 'full', you will get a string that can be used to input into a database with a new line at the end. Use 'rawfull' to return the string without the new line.

# What is PBKDF2?

> PBKDF2 applies a pseudorandom function, such as hash-based message authentication code (HMAC), to the input password or passphrase along with a salt value and repeats the process many times to produce a derived key, which can then be used as a cryptographic key in subsequent operations. The added computational work makes password cracking much more difficult, and is known as key stretching. 
*[Source: Wikipedia](https://en.wikipedia.org/wiki/PBKDF2)*

PBKDF2 is used in many applications where a password needs to be stored for future verification. Unlike just using a straight Hashing Algorithm, PBKDF2 uses a "salt" along side the password, and rehashes repeatedly according to the number of "iterations".

# Why did I write this script?

I needed to be able to write passwords to MySQL/MariaDB/SQLite databases from the commandline. I couldn't find a native way to create the hash, and doing it in pure Bash took forever, so I eventually found a way to do it quickly by embedding Python code in the script.

# NOTE:

This script requires Python3 which as it's own license. Please visit https://github.com/python/cpython for more information.

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