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author | Kevin Serrano <kevgagser@gmail.com> | 2016-10-20 02:17:29 +0800 |
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committer | Kevin Serrano <kevgagser@gmail.com> | 2016-10-20 02:17:29 +0800 |
commit | 17506fe14f84680bc6b5421eff4c797154a513bd (patch) | |
tree | 339b1562b84402f7a609ec1d5ab5aea1a2cab76d /app/scripts/lib/encryptor.js | |
parent | 1481a3ef8e3352eb74fa11c4f578d15d84c76de7 (diff) | |
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Merge in crypto.
Diffstat (limited to 'app/scripts/lib/encryptor.js')
-rw-r--r-- | app/scripts/lib/encryptor.js | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/app/scripts/lib/encryptor.js b/app/scripts/lib/encryptor.js new file mode 100644 index 000000000..91d6ed5ce --- /dev/null +++ b/app/scripts/lib/encryptor.js @@ -0,0 +1,119 @@ +var ethUtil = require('ethereumjs-util') + +module.exports = { + + // Simple encryption methods: + encrypt, + decrypt, + + // More advanced encryption methods: + keyFromPassword, + encryptWithKey, + decryptWithKey, + + // Buffer <-> String methods + convertArrayBufferViewtoString, + convertStringToArrayBufferView, + + // Buffer <-> Hex string methods + serializeBufferForStorage, + serializeBufferFromStorage, +} + +// Takes a Pojo, returns encrypted text. +function encrypt (password, dataObj) { + return keyFromPassword(password) + .then(function (passwordDerivedKey) { + return encryptWithKey(passwordDerivedKey, dataObj) + }) +} + +function encryptWithKey (key, dataObj) { + var data = JSON.stringify(dataObj) + var dataBuffer = convertStringToArrayBufferView(data) + var vector = global.crypto.getRandomValues(new Uint8Array(16)) + + return global.crypto.subtle.encrypt({ + name: 'AES-GCM', + iv: vector, + }, key, dataBuffer).then(function(buf){ + var buffer = new Uint8Array(buf) + var vectorStr = serializeBufferForStorage(vector) + return serializeBufferForStorage(buffer) + vectorStr + }) +} + +// Takes encrypted text, returns the restored Pojo. +function decrypt (password, text) { + return keyFromPassword(password) + .then(function (key) { + return decryptWithKey(key, text) + }) +} + +function decryptWithKey (key, text) { + const parts = text.split('0x') + const encryptedData = serializeBufferFromStorage(parts[1]) + const vector = serializeBufferFromStorage(parts[2]) + return crypto.subtle.decrypt({name: 'AES-GCM', iv: vector}, key, encryptedData) + .then(function(result){ + const decryptedData = new Uint8Array(result) + const decryptedStr = convertArrayBufferViewtoString(decryptedData) + const decryptedObj = JSON.parse(decryptedStr) + return decryptedObj + }) +} + +function convertStringToArrayBufferView (str) { + var bytes = new Uint8Array(str.length) + for (var i = 0; i < str.length; i++) { + bytes[i] = str.charCodeAt(i) + } + + return bytes +} + +function convertArrayBufferViewtoString (buffer) { + var str = '' + for (var i = 0; i < buffer.byteLength; i++) { + str += String.fromCharCode(buffer[i]) + } + + return str +} + +function keyFromPassword (password) { + var passBuffer = convertStringToArrayBufferView(password) + return global.crypto.subtle.digest('SHA-256', passBuffer) + .then(function (passHash){ + return global.crypto.subtle.importKey('raw', passHash, {name: 'AES-GCM'}, false, ['encrypt', 'decrypt']) + }) +} + +function serializeBufferFromStorage (str) { + str = ethUtil.stripHexPrefix(str) + var buf = new Uint8Array(str.length / 2) + for (var i = 0; i < str.length; i += 2) { + var seg = str.substr(i, 2) + buf[i / 2] = parseInt(seg, 16) + } + return buf +} + +// Should return a string, ready for storage, in hex format. +function serializeBufferForStorage (buffer) { + var result = '0x' + var len = buffer.length || buffer.byteLength + for (var i = 0; i < len; i++) { + result += unprefixedHex(buffer[i]) + } + return result +} + +function unprefixedHex (num) { + var hex = num.toString(16) + while (hex.length < 2) { + hex = '0' + hex + } + return hex +} |