.

qwen/nodejs/node_modules/pg/lib/crypto/utils-legacy.js

@@ -0,0 +1,43 @@
+'use strict'
+// This file contains crypto utility functions for versions of Node.js < 15.0.0,
+// which does not support the WebCrypto.subtle API.
+
+const nodeCrypto = require('crypto')
+
+function md5(string) {
+  return nodeCrypto.createHash('md5').update(string, 'utf-8').digest('hex')
+}
+
+// See AuthenticationMD5Password at https://www.postgresql.org/docs/current/static/protocol-flow.html
+function postgresMd5PasswordHash(user, password, salt) {
+  const inner = md5(password + user)
+  const outer = md5(Buffer.concat([Buffer.from(inner), salt]))
+  return 'md5' + outer
+}
+
+function sha256(text) {
+  return nodeCrypto.createHash('sha256').update(text).digest()
+}
+
+function hashByName(hashName, text) {
+  hashName = hashName.replace(/(\D)-/, '$1') // e.g. SHA-256 -> SHA256
+  return nodeCrypto.createHash(hashName).update(text).digest()
+}
+
+function hmacSha256(key, msg) {
+  return nodeCrypto.createHmac('sha256', key).update(msg).digest()
+}
+
+async function deriveKey(password, salt, iterations) {
+  return nodeCrypto.pbkdf2Sync(password, salt, iterations, 32, 'sha256')
+}
+
+module.exports = {
+  postgresMd5PasswordHash,
+  randomBytes: nodeCrypto.randomBytes,
+  deriveKey,
+  sha256,
+  hashByName,
+  hmacSha256,
+  md5,
+}