add sodium-plus js crypto library

1 files changed, 80 insertions, 0 deletions

diff --git a/library/sodium-plus/lib/cryptography-key.js b/library/sodium-plus/lib/cryptography-key.js
new file mode 100644
index 000000000..8aed3a786
--- /dev/null
+++ b/library/sodium-plus/lib/cryptography-key.js
@@ -0,0 +1,80 @@
+"use strict";
+
+/* istanbul ignore if */
+if (typeof (Buffer) === 'undefined') {
+    let Buffer = require('buffer/').Buffer;
+}
+module.exports = class CryptographyKey {
+    /**
+     * Note: We use Object.defineProperty() to hide the buffer inside of the
+     * CryptographyKey object to prevent accidental leaks.
+     *
+     * @param {Buffer} buf
+     */
+    constructor(buf) {
+        if (!Buffer.isBuffer(buf)) {
+            throw new TypeError('Argument 1 must be an instance of Buffer.');
+        }
+        Object.defineProperty(this, 'buffer', {
+            enumerable: false,
+            value: buf.slice()
+        });
+    }
+
+    /**
+     * @return {CryptographyKey}
+     */
+    static from() {
+        return new CryptographyKey(Buffer.from(...arguments));
+    }
+
+    /**
+     * @return {boolean}
+     */
+    isEd25519Key() {
+        return false;
+    }
+
+    /**
+     * @return {boolean}
+     */
+    isX25519Key() {
+        return false;
+    }
+
+    /**
+     * @return {boolean}
+     */
+    isPublicKey() {
+        return false;
+    }
+
+    /**
+     * @return {Number}
+     */
+    getLength() {
+        return this.buffer.length;
+    }
+
+    /**
+     * @return {Buffer}
+     */
+    getBuffer() {
+        return this.buffer;
+    }
+
+    /**
+     * @param {string} encoding
+     */
+    toString(encoding = 'utf-8') {
+        /* istanbul ignore if */
+        return this.getBuffer().toString(encoding);
+    }
+
+    /**
+     * @return {Buffer}
+     */
+    slice() {
+        return this.buffer.slice(...arguments);
+    }
+};