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+/**
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+ * @author n1474335 [n1474335@gmail.com]
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+ * @copyright Crown Copyright 2016
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+ * @license Apache-2.0
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+ */
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+
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+import Operation from "../Operation";
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+import Utils from "../Utils";
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+import forge from "node-forge/dist/forge.min.js";
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+
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+/**
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+ * AES Decrypt operation
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+ */
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+class AESDecrypt extends Operation {
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+
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+ /**
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+ * AESDecrypt constructor
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+ */
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+ constructor() {
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+ super();
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+
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+ this.name = "AES Decrypt";
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+ this.module = "Ciphers";
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+ this.description = "Advanced Encryption Standard (AES) is a U.S. Federal Information Processing Standard (FIPS). It was selected after a 5-year process where 15 competing designs were evaluated.<br><br><b>Key:</b> The following algorithms will be used based on the size of the key:<ul><li>16 bytes = AES-128</li><li>24 bytes = AES-192</li><li>32 bytes = AES-256</li></ul><br><br><b>IV:</b> The Initialization Vector should be 16 bytes long. If not entered, it will default to 16 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used.<br><br><b>GCM Tag:</b> This field is ignored unless 'GCM' mode is used.";
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+ this.inputType = "string";
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+ this.outputType = "string";
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+ this.args = [
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+ {
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+ "name": "Key",
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+ "type": "toggleString",
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+ "value": "",
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+ "toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
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+ },
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+ {
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+ "name": "IV",
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+ "type": "toggleString",
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+ "value": "",
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+ "toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
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+ },
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+ {
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+ "name": "Mode",
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+ "type": "option",
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+ "value": ["CBC", "CFB", "OFB", "CTR", "GCM", "ECB"]
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+ },
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+ {
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+ "name": "Input",
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+ "type": "option",
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+ "value": ["Hex", "Raw"]
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+ },
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+ {
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+ "name": "Output",
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+ "type": "option",
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+ "value": ["Raw", "Hex"]
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+ },
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+ {
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+ "name": "GCM Tag",
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+ "type": "toggleString",
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+ "value": "",
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+ "toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
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+ }
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+ ];
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+ }
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+
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+ /**
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+ * @param {string} input
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+ * @param {Object[]} args
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+ * @returns {string}
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+ */
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+ run(input, args) {
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+ const key = Utils.convertToByteArray(args[0].string, args[0].option),
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+ iv = Utils.convertToByteArray(args[1].string, args[1].option),
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+ mode = args[2],
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+ inputType = args[3],
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+ outputType = args[4],
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+ gcmTag = Utils.convertToByteString(args[5].string, args[5].option);
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+
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+ if ([16, 24, 32].indexOf(key.length) < 0) {
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+ return `Invalid key length: ${key.length} bytes
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+
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+The following algorithms will be used based on the size of the key:
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+ 16 bytes = AES-128
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+ 24 bytes = AES-192
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+ 32 bytes = AES-256`;
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+ }
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+
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+ input = Utils.convertToByteString(input, inputType);
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+
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+ const decipher = forge.cipher.createDecipher("AES-" + mode, key);
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+ decipher.start({
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+ iv: iv,
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+ tag: gcmTag
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+ });
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+ decipher.update(forge.util.createBuffer(input));
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+ const result = decipher.finish();
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+
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+ if (result) {
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+ return outputType === "Hex" ? decipher.output.toHex() : decipher.output.getBytes();
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+ } else {
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+ return "Unable to decrypt input with these parameters.";
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+ }
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+ }
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+
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+}
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+
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+export default AESDecrypt;
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