A858 Decrypter

Usage:

$ npm install -g a858decrypter
$ massdecrypt --in-file all_posts.csv --key-file keys.txt --key-transform md5 --key-transform dehex --keyiv 0 --modes des-ede

The mass decrypt cli application will then attempt all keys inside of the keys.txt, perform the transforms,
load in the post list and then perform the decryption and output them to the files.

This command may seem long winded however there are some sensible defaults which are explained below. Sometimes you may want to be specific with what you are doing so you can be sure you have properly tried a decryption key.

Command Information

``
A858 Decrypter
Decrypts A858 posts based on a key list and cipher modes.

-n, --keyiv Number of null bytes to use for a null IV to allow for unknown IV raw key
decryption.
Defaults: NONE USED
-h, --help Show this usage information
-p, --preprocessor Specifies javascript files of which exports a function that pre-processes the
post data into keys, ivs or mutates the post. View the API to see what you can
do at the GitHub project.
Defaults: NONE
-o, --out-ascii File to place ASCII encoded output
Defaults: [][ASCII][Results].txt
-u, --out-unicode File to place Unicode encoded output
Defaults: [][Unicode][Results].txt
-c, --out-csv Output the decrypted results to a new file if the decrypted posts was hex,
ready for reprocessing
Defaults: []hex-posts.csv
-i, --in-file CSV File containing A858 post data
Defaults: all.csv
[-e, --errors Out file for errors] IN PRODUCTION

-k, --key-file Line separated keys. May specify IVs on the same line usng key=iv. You can
change this separater using the -iv-seperator switch
Defaults: keys.txt
-s, --iv-separator The seperator for the IV in the key file.
Defaults: =
-w, --workers Number of worker threads to use
Defaults: 4
-m, --modes The cipher modes to use, allowed ciphers: CAST-cbc, aes-128-cbc,
aes-128-cbc-hmac-sha1, aes-128-cfb, aes-128-cfb1, aes-128-cfb8, aes-128-ctr,
aes-128-ecb, aes-128-gcm, aes-128-ofb, aes-128-xts, aes-192-cbc, aes-192-cfb,
aes-192-cfb1, aes-192-cfb8, aes-192-ctr, aes-192-ecb, aes-192-gcm,
aes-192-ofb, aes-256-cbc, aes-256-cbc-hmac-sha1, aes-256-cfb, aes-256-cfb1,
aes-256-cfb8, aes-256-ctr, aes-256-ecb, aes-256-gcm, aes-256-ofb, aes-256-xts,
aes128, aes192, aes256, bf, bf-cbc, bf-cfb, bf-ecb, bf-ofb, blowfish,
camellia-128-cbc, camellia-128-cfb, camellia-128-cfb1, camellia-128-cfb8,
camellia-128-ecb, camellia-128-ofb, camellia-192-cbc, camellia-192-cfb,
camellia-192-cfb1, camellia-192-cfb8, camellia-192-ecb, camellia-192-ofb,
camellia-256-cbc, camellia-256-cfb, camellia-256-cfb1, camellia-256-cfb8,
camellia-256-ecb, camellia-256-ofb, camellia128, camellia192, camellia256,
cast, cast-cbc, cast5-cbc, cast5-cfb, cast5-ecb, cast5-ofb, des, des-cbc,
des-cfb, des-cfb1, des-cfb8, des-ecb, des-ede, des-ede-cbc, des-ede-cfb,
des-ede-ofb, des-ede3, des-ede3-cbc, des-ede3-cfb, des-ede3-cfb1,
des-ede3-cfb8, des-ede3-ofb, des-ofb, des3, desx, desx-cbc, id-aes128-GCM,
id-aes192-GCM, id-aes256-GCM, idea, idea-cbc, idea-cfb, idea-ecb, idea-ofb,
rc2, rc2-40-cbc, rc2-64-cbc, rc2-cbc, rc2-cfb, rc2-ecb, rc2-ofb, rc4, rc4-40,
rc4-hmac-md5, seed, seed-cbc, seed-cfb, seed-ecb, seed-ofb
Defaults to: des-ede
-a, --all-ciphers Switch if it should decrypt using all possible ciphers
-t, --key-transform Specifies whether to use a transform on the key. Defaults to none. Potential
transforms are: none, dehex, enhex, string, uppercase, lowercase,
DSA-SHA1-old, dsa, dsa-sha, dsa-sha1, dsaEncryption, dsaWithSHA, dsaWithSHA1,
dss1, ecdsa-with-SHA1, md4, md4WithRSAEncryption, md5, md5WithRSAEncryption,
mdc2, mdc2WithRSA, ripemd, ripemd160, ripemd160WithRSA, rmd160, rsa-md4,
rsa-md5, rsa-mdc2, rsa-ripemd160, rsa-sha, rsa-sha1, rsa-sha1-2, rsa-sha224,
rsa-sha256, rsa-sha384, rsa-sha512, sha, sha1, sha1WithRSAEncryption, sha224,
sha224WithRSAEncryption, sha256, sha256WithRSAEncryption, sha384,
sha384WithRSAEncryption, sha512, sha512WithRSAEncryption,
shaWithRSAEncryption, ssl2-md5, ssl3-md5, ssl3-sha1, whirlpool
Transforms are processed in order. Hashing algorithms output in hex so you may
want to dehex.

Project home: https://github.com/TomCaserta/A858Decrypter ReadMe: https://github.com/TomCaserta/A858Decrypter/README.MD
``

Key Transformations

Transforms can be made to keys by specifying the -t switch. You can have multiple transforms done to a key in the key file.

All of these transforms will be performed on the key in order they appear in the command. It will not modify the original file however the new key will be used for decryption.

TODO

* Properly implement post pre-processors
* Implement errors file
* Optimise the testing of keys, currently when each new key is attempted. Each post is serialised with that key when sent to the decrypter thread. This is highly inefficient and makes it impossible to use large key lists.
* Properly implement an API so the functionality can be extended