crypt-maker

Use node.js crypt api for make encrypted messages. Works sync.

Class documentation by jsDuck.

There also is documentation on rus.

Install with:

npm install crypt-maker

Usage

Simple example:

    var CM = require("crypt-maker");
    var crypt = new CM({key: 'some-crypt-key'});

    var messageJSON = {
        header: {
            some: 'header',
            another: 'awesome header'
        },
        body: {
            time: '11:22',
            whisp: 'do this' 
        }
    };
    
    var encrypted = crypt.makeMessage(messageJSON);
    
    console.log(encrypted);
    //{"some":"header","another":"awesome header"}
    //a4d355b6522d3d69baca7ff06310f24c992b0fa83ca6ae43e0f7e83340a001e618af6e48e1fb9fca63181acc8162f520
    
    var decrypted = {header: crypt.getHeader(encrypted), body: crypt.getBody(encrypted)};
    console.log(decrypted);
    //{ header: { some: 'header', another: 'awesome header' },
    //  body: { time: '11:22', whisp: 'do this' } }
    var decryptedAll = crypt.parseMessage(encrypted);
    console.log(decryptedAll);

Methods

CM.createCryptMaker()

Is the same as:

new CM()

• CM.createCryptMaker({key: '123'}) = crypt.createCryptMaker({key: '123', algorithm:'aes123', EOM:'\r\n\r\n', SOP:'\r\n'})

If algorithm !== 'no' and no key passed to constructor - throws error (EmptyKeyError)

• key: key to crypt strings
• algorithm: which algorithm use to encrypt messages. Default aes128
• EOM: which symbols indicate ends of messages. Default \r\n\r\n
• SOP: which symbols indicate separate between header and message. Default \r\n
• headerEncrypted: true if header should encrypted. Default false

cm.decrypt(str)

Return decrypted string. If algorithm == 'no' returns str.

Parameters:

Name	Type	Description
str	String	string to decrypt

cm.encrypt(str)

Return encrypted string. If algorithm == 'no' returns str.

Parameters:

Name	Type	Description
str	String	string to encrypt

cm.format(messagePart) Deprecated

Make string from JSON with message part.

Parameters:

Name	Type	Description
messagePart	any, except function

cm.parse(messagePart) Deprecated

Unformat message part back to Object | Boolean | String | Number.

Parameters:

Name	Type	Description
messagePart	String

cm.getBody(message)

Get body from encrypted message. If typeof message == undefined || message length == 0 or no SOP at message, returns null. Else if can't parse message - return null.

Parameters:

Name	Type	Description
message	String	encrypted message

cm.getBodyAsync(message, callback) Deprecated

Same as sync version. But doesn't return null, and returns error objects. Is not realy async!

Parameters:

Name	Type	Description
message	String	encrypted message
callback	Function

cm.getHeader(message)

Get header from encrypted message. If typeof message == undefined || message.length == 0 or no SOP at message, returns null. Else if can't parse message - return null.

Parameters:

Name	Type	Description
message	String	encrypted message

cm.getHeaderAsync(message, callback) Deprecated

Same as sync version. But doesn't return null, and returns error objects. Is not really async!

Parameters:

Name	Type	Description
message	String	encrypted message
callback	Function

cm.makeMessage(message[, body])

Make encrypt message form object. If body is defined - message should be header of message.

Parameters:

Name	Type	Description
message	Object	Message object. If body is not defined - should be header object.
message.header	Object	Header of message. Only if body parameter is not defined.
message.body	Object	Body of message. Only if body parameter is not defined.
body	Object	Optional. If defined - body of message.

cm.makeMessageAsync(message, callback) Deprecated

Same as sync version. But doesn't return null, and returns error objects. Is not really async!

Parameters:

Name	Type	Description
message	Object	Message object.
message.header	Object	Header of message.
message.body	Object	Body of message.
callback	Function	Callback function.

cm.parseMessage(message)

Decrypt message form object. Returns Object like {header: ... , body: ... }

Parameters:

Name	Type	Description
message	String

cm.splitMessages(raw)

Splits many messages to array of messages.

Parameters:

Name	Type	Description
raw	String	raw messages string

Returns: return [] if no EOMs at the end of raw strings

cm.splitMessagesForce(raw)

Splits many massages at raw string to array. Last element is tail of raw string. If some message was not fully emitted - it will be this element. If all messages are entire it will be ''.

Parameters:

Name	Type	Description
raw	String	raw messages string

Returns: return [message1, message2, message3, ... , tail('' or part of messageN)] tail is '' if last message fully emitted.

cm.splitMessagesAsync(raw, callback) Deprecated

Splits many messages to array.

Parameters:

Name	Type	Description
raw	String	messages
callback	Function

Returns: return [] if no EOMs at the end of raw strings

cm.addEom(string) Deprecated

Add EOM symbol to string if there is not EOM at the end.

Parameters:

Name	Type	Description
string	String	one encrypted message

Returns: return string+EOM or string.

cm.replaceHeader(header, message)

Replace header of message to new.

Parameters:

Name	Type	Description
header	Object	new header for message
message	String	encrypted message

Returns: return message with new header.

LICENSE - "MIT License"

Copyright (c) 2015 Konstantine Petryaev

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.