CORE-POS/IS4C

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SETUP INFO
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This plugin stores some sensitive information
using RSA encryption. This requires some
additional setup.

REQUIREMENTS:
* OpenSSL extension for PHP
* OpenSSL itself (or some other way of generating keys)

CREATE KEYS:
Instructions assume using OpenSSL.
Create private key
# openssl genrsa -out private.key 2048
Create a corresponding public key
# openssl rsa -in private.key -pubout -out public.key

You should now have two files named "public.key" and
"private.key". 

USE KEYS:
The public key file must go in this plugin's "keys" directory. 
No other files are allowed in that directory. The public
key will be used to encrypt information before saving it.
No other files are allowed in the "keys" directory.

To retrieve the information, you must supply the private key.
Once you've got everything setup, it is highly recommended
that you remove the private key from the server. Also, do
not lose your key.

REVOCATION:
There's no formal key revocation built in. Recommendation in
that scenario is:
1. Shut off any network access
2. Decrypt data with current private key
3. Generate new keys
4. Re-encrypt data with new public key
5. Distribute new private key to whoever needs access

If this isn't sufficient for your use case, feel free to
suggest changes.

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CUSTOM IMAGES
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The plugin will use the following images if
present in the "img" directory. Do not commit
these to git; everyone will have different
images.

1. sig.png (signature for checks)
2. logo.png
3. letterhead.png