Update hashes to v1.5, test on nodejs v14, improve h2c checks

.github/workflows/nodejs.yml

@@ -9,6 +9,7 @@ jobs:
     strategy:
       matrix:
         node:
+          - 14
           - 16
           - 18
           - 20

README.md

@@ -12,9 +12,7 @@ Audited & minimal JS implementation of elliptic curve cryptography.
 - 🧜‍♂️ Poseidon ZK-friendly hash
 - 🪶 178KB (87KB gzipped) for everything including bundled hashes, 22KB (10KB gzipped) for single-curve build
 
-For discussions, questions and support, visit
-[GitHub Discussions](https://github.com/paulmillr/noble-curves/discussions)
-section of the repository.
+Take a glance at [GitHub Discussions](https://github.com/paulmillr/noble-curves/discussions) for questions and support.
 
 ### This library belongs to _noble_ cryptography
 
@@ -45,7 +43,7 @@ A standalone file [noble-curves.js](https://github.com/paulmillr/noble-curves/re
 ```js
 // import * from '@noble/curves'; // Error: use sub-imports, to ensure small app size
 import { secp256k1 } from '@noble/curves/secp256k1'; // ESM and Common.js
-// import { secp256k1 } from 'npm:@noble/curves@1.4.0/secp256k1'; // Deno
+// import { secp256k1 } from 'npm:@noble/curves@1.6.0/secp256k1'; // Deno
 ```
 
 - [Implementations](#implementations)

package.json

@@ -28,7 +28,7 @@
   },
   "license": "MIT",
   "dependencies": {
-    "@noble/hashes": "1.4.0"
+    "@noble/hashes": "1.5.0"
   },
   "devDependencies": {
     "@paulmillr/jsbt": "0.2.1",

src/abstract/hash-to-curve.ts

@@ -67,8 +67,7 @@ export function expand_message_xmd(
   if (DST.length > 255) DST = H(concatBytes(utf8ToBytes('H2C-OVERSIZE-DST-'), DST));
   const { outputLen: b_in_bytes, blockLen: r_in_bytes } = H;
   const ell = Math.ceil(lenInBytes / b_in_bytes);
-  if (lenInBytes > 65535 || ell > 255)
-    throw new Error('expand_message_xmd: invalid lenInBytes');
+  if (lenInBytes > 65535 || ell > 255) throw new Error('expand_message_xmd: invalid lenInBytes');
   const DST_prime = concatBytes(DST, i2osp(DST.length, 1));
   const Z_pad = i2osp(0, r_in_bytes);
   const l_i_b_str = i2osp(lenInBytes, 2); // len_in_bytes_str