Add the SM4 block cipher, also a no-padding option for block ciphers.

This adds an implementation of the SM4 block cipher, and operations to encrypt and decrypt using it with CBC,ECB,CFB,OFB,CTR modes. Also, a "no padding" option is added for AES,DES,3DES and SM4 decryption in ECB/CBC modes. This variant does not attempt to validate the last block as being PKCS#7 padded. This is useful, both since other padding schemes exist, and also for decrypting data where the final block is missing.
2025-04-21 15:26:16 -04:00 · 2021-03-24 00:58:54 +01:00 · 2021-03-24 00:58:54 +01:00 · 6155634d3b
commit 6155634d3b
parent 5029356514
9 changed files with 821 additions and 7 deletions
--- a/src/core/operations/SM4Encrypt.mjs
+++ b/src/core/operations/SM4Encrypt.mjs
@ -0,0 +1,88 @@
+/**
+ * @author swesven
+ * @copyright 2021
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import Utils from "../Utils.mjs";
+import OperationError from "../errors/OperationError.mjs";
+import { toHex } from "../lib/Hex.mjs";
+import { encryptSM4 } from "../lib/SM4.mjs";
+
+/**
+ * SM4 Encrypt operation
+ */
+class SM4Encrypt extends Operation {
+
+    /**
+     * SM4Encrypt constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "SM4 Encrypt";
+        this.module = "Ciphers";
+        this.description = "SM4 is a 128-bit block cipher, currently established as a national standard (GB/T 32907-2016) of China. Multiple block cipher modes are supported. When using CBC or ECB mode, the PKCS#7 padding scheme is used.";
+        this.infoURL = "https://en.wikipedia.org/wiki/SM4_(cipher)";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Key",
+                "type": "toggleString",
+                "value": "",
+                "toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
+            },
+            {
+                "name": "IV",
+                "type": "toggleString",
+                "value": "",
+                "toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
+            },
+            {
+                "name": "Mode",
+                "type": "option",
+                "value": ["CBC", "CFB", "OFB", "CTR", "ECB"]
+            },
+            {
+                "name": "Input",
+                "type": "option",
+                "value": ["Raw", "Hex"]
+            },
+            {
+                "name": "Output",
+                "type": "option",
+                "value": ["Hex", "Raw"]
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const key = Utils.convertToByteArray(args[0].string, args[0].option),
+            iv = Utils.convertToByteArray(args[1].string, args[1].option),
+            [,, mode, inputType, outputType] = args;
+
+        if (key.length !== 16)
+            throw new OperationError(`Invalid key length: ${key.length} bytes
+
+SM4 uses a key length of 16 bytes (128 bits).`);
+        if (iv.length !== 16 && !mode.startsWith("ECB"))
+            throw new OperationError(`Invalid IV length: ${iv.length} bytes
+
+SM4 uses an IV length of 16 bytes (128 bits).
+Make sure you have specified the type correctly (e.g. Hex vs UTF8).`);
+
+        input = Utils.convertToByteArray(input, inputType);
+        const output = encryptSM4(input, key, iv, mode.substring(0, 3), mode.endsWith("NoPadding"));
+        return outputType === "Hex" ? toHex(output) : Utils.byteArrayToUtf8(output);
+    }
+
+}
+
+export default SM4Encrypt;