First Cryptochef branch commit.

src/core/operations/ExtractSeedPhrases.mjs

@@ -0,0 +1,87 @@
+/**
+ * Extracts seedphrases. Right now, extracts BIP39 and Electrum2 seedphrases.
+ *
+ * @author dgoldenberg [virtualcurrency@mitre.org]
+ * @copyright  MITRE 2023 Wei Lu <luwei.here@gmail.com> and Daniel Cousens <email@dcousens.com> 2014
+ * @license ISC
+ */
+import Operation from "../Operation.mjs";
+import { search} from "../lib/Extract.mjs";
+import {bip39, electrum2} from "../lib/Seedphrase.mjs";
+import OperationError from "../errors/OperationError.mjs";
+
+/**
+ * Extract Cryptocurrency addresses that are Base58 Encoded, with Double SHA256 Checksum.
+ */
+class ExtractSeedPhrases extends Operation {
+
+    /**
+     * Extract Seedphrases Constructor.
+     */
+    constructor() {
+        super();
+
+        this.name = "Extract Seedphrases";
+        this.module = "Regex";
+        this.description = "Attempts to extract seedphrases from text. Right now, only BIP39 and Electrum2 standards and the English language supported.";
+        this.infoURL = "https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [{
+            "name": "Seedphrase Type",
+            "type": "option",
+            "value": ["bip39", "electrum2"]
+        }];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+
+        const regex = /[a-z]{3,20}/g;
+
+        const type = args[0];
+        let seedphraseInfo = {};
+        if (type === "bip39") {
+            seedphraseInfo = bip39;
+        } else if (type === "electrum2") {
+            seedphraseInfo = electrum2;
+        } else {
+            throw new OperationError("Unknown seedphrase type value: " + type);
+        }
+
+        let output = "";
+        const wordArray = search(input, regex, null, false);
+
+        // Start scanning through the list
+        for (let i = 0; i < wordArray.length; i++) {
+            // If we find a starting element in the wordlist, we expand.
+            if (seedphraseInfo.english.includes(wordArray[i])) {
+                for (let j = 0; j < seedphraseInfo.acceptable_lengths.length; j++) {
+                    // For each possible length, we scan through the list.
+                    const curPhraseLength = seedphraseInfo.acceptable_lengths[j];
+                    let correctPhrase = true;
+                    for (let w =0; w < curPhraseLength; w++) {
+                        if (!seedphraseInfo.english.includes(wordArray[i + w])) {
+                            correctPhrase = false;
+                        }
+                    }
+                    // If all words in that slice belong in the word list, and the checksum holds we assume the phrase is a valid one.
+                    if (correctPhrase) {
+                        if (seedphraseInfo.checksum(wordArray.slice(i, i + curPhraseLength).join(" "), seedphraseInfo.english)) {
+                            output += wordArray.slice(i, i + curPhraseLength).join(" ") + "\n";
+                        }
+                    }
+                }
+
+            }
+        }
+        return output;
+    }
+
+}
+
+export default ExtractSeedPhrases;