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47 lines
1.6 KiB
CoffeeScript
47 lines
1.6 KiB
CoffeeScript
crypto = require('crypto')
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ALGORITHM = 'aes-256-ctr'
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keyFn = (password, salt, callback)->
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return crypto.pbkdf2(password, salt, 10000, 64, callback)
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class AccessTokenEncryptor
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constructor: (settings) ->
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@settings = settings
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@cipherLabel = @settings.cipherLabel
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throw Error("cipherLabel must not contain a colon (:)") if @cipherLabel?.match(/:/)
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@cipherPassword = @settings.cipherPasswords[@cipherLabel]
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throw Error("cipherPassword not set") if not @cipherPassword?
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throw Error("cipherPassword too short") if @cipherPassword.length < 16
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encryptJson: (json, callback) ->
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string = JSON.stringify(json)
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salt = crypto.randomBytes(16)
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keyFn @cipherPassword, salt, (err, key) =>
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if err?
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logger.err err:err, "error getting Fn key"
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return callback(err)
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cipher = crypto.createCipher(ALGORITHM, key)
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crypted = cipher.update(string, 'utf8', 'base64') + cipher.final('base64')
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callback(null, @cipherLabel + ":" + salt.toString('hex') + ":" + crypted)
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decryptToJson: (encryptedJson, callback) ->
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[label, salt, cipherText] = encryptedJson.split(':', 3)
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password = @settings.cipherPasswords[label]
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return callback(new Error("invalid password")) if not password? or password.length < 16
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keyFn password, new Buffer(salt, 'hex'), (err, key) =>
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if err?
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logger.err err:err, "error getting Fn key"
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return callback(err)
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decipher = crypto.createDecipher(ALGORITHM, key)
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dec = decipher.update(cipherText, 'base64', 'utf8') + decipher.final('utf8')
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try
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json = JSON.parse(dec)
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catch e
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return callback(new Error("error decrypting token"))
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callback(null, json)
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module.exports = AccessTokenEncryptor
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