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aws/lambda-nodejs18.x/UpdateZulipStreams/node_modules/aws-sdk/lib/browserHmac.js

@@ -0,0 +1,65 @@
+var hashUtils = require('./browserHashUtils');
+
+/**
+ * @api private
+ */
+function Hmac(hashCtor, secret) {
+    this.hash = new hashCtor();
+    this.outer = new hashCtor();
+
+    var inner = bufferFromSecret(hashCtor, secret);
+    var outer = new Uint8Array(hashCtor.BLOCK_SIZE);
+    outer.set(inner);
+
+    for (var i = 0; i < hashCtor.BLOCK_SIZE; i++) {
+        inner[i] ^= 0x36;
+        outer[i] ^= 0x5c;
+    }
+
+    this.hash.update(inner);
+    this.outer.update(outer);
+
+    // Zero out the copied key buffer.
+    for (var i = 0; i < inner.byteLength; i++) {
+        inner[i] = 0;
+    }
+}
+
+/**
+ * @api private
+ */
+module.exports = exports = Hmac;
+
+Hmac.prototype.update = function (toHash) {
+    if (hashUtils.isEmptyData(toHash) || this.error) {
+        return this;
+    }
+
+    try {
+        this.hash.update(hashUtils.convertToBuffer(toHash));
+    } catch (e) {
+        this.error = e;
+    }
+
+    return this;
+};
+
+Hmac.prototype.digest = function (encoding) {
+    if (!this.outer.finished) {
+        this.outer.update(this.hash.digest());
+    }
+
+    return this.outer.digest(encoding);
+};
+
+function bufferFromSecret(hashCtor, secret) {
+    var input = hashUtils.convertToBuffer(secret);
+    if (input.byteLength > hashCtor.BLOCK_SIZE) {
+        var bufferHash = new hashCtor;
+        bufferHash.update(input);
+        input = bufferHash.digest();
+    }
+    var buffer = new Uint8Array(hashCtor.BLOCK_SIZE);
+    buffer.set(input);
+    return buffer;
+}