feat(browser): Implement fallback SHA256 for non-HTTPS environments and enhance browser tests for consistent hashing

ts_web/00_commitinfo_data.ts

@@ -0,0 +1,8 @@
+/**
+ * autocreated commitinfo by @push.rocks/commitinfo
+ */
+export const commitinfo = {
+  name: '@push.rocks/smarthash',
+  version: '3.1.0',
+  description: 'Cross-environment hash functions (SHA256 and MD5) for Node.js and browsers, with support for strings, streams, and files.'
+}

ts_web/index.ts

@@ -1,4 +1,5 @@
 import * as plugins from './plugins.js';
+import { sha256Fallback } from './sha256.fallback.js';
 
 /**
  * Convert ArrayBuffer to hex string
@@ -21,15 +22,28 @@ const hex = (buffer: ArrayBuffer): string => {
   return hexCodes.join("");
 };
 
+/**
+ * Check if crypto.subtle is available
+ */
+const isCryptoSubtleAvailable = (): boolean => {
+  return typeof crypto !== 'undefined' && crypto.subtle !== undefined;
+};
+
 /**
  * Computes sha256 Hash from String
  */
 export const sha256FromString = async (stringArg: string): Promise<string> => {
   // Get the string as arraybuffer.
   const buffer = (new TextEncoder()).encode(stringArg);
-  const hash = await crypto.subtle.digest("SHA-256", buffer);
-  const result = hex(hash);
-  return result;
+  
+  if (isCryptoSubtleAvailable()) {
+    const hash = await crypto.subtle.digest("SHA-256", buffer);
+    const result = hex(hash);
+    return result;
+  } else {
+    // Use fallback for non-HTTPS environments
+    return sha256Fallback(buffer);
+  }
 };
 
 /**
@@ -45,9 +59,15 @@ export const sha256FromStringSync = (stringArg: string): string => {
  * Computes sha256 Hash from ArrayBuffer
  */
 export const sha256FromBuffer = async (bufferArg: ArrayBuffer | Uint8Array): Promise<string> => {
-  const hash = await crypto.subtle.digest("SHA-256", bufferArg);
-  const result = hex(hash);
-  return result;
+  if (isCryptoSubtleAvailable()) {
+    const hash = await crypto.subtle.digest("SHA-256", bufferArg);
+    const result = hex(hash);
+    return result;
+  } else {
+    // Use fallback for non-HTTPS environments
+    const uint8Array = bufferArg instanceof Uint8Array ? bufferArg : new Uint8Array(bufferArg);
+    return sha256Fallback(uint8Array);
+  }
 };
 
 /**

ts_web/sha256.fallback.ts

@@ -0,0 +1,121 @@
+/**
+ * Pure JavaScript SHA256 implementation
+ * Used as fallback when crypto.subtle is not available (non-HTTPS contexts)
+ */
+
+/**
+ * SHA256 constants
+ */
+const K: number[] = [
+  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+  0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+  0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+  0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+  0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+  0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+  0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+];
+
+/**
+ * Initial hash values
+ */
+const H: number[] = [
+  0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
+  0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
+];
+
+/**
+ * Rotate right
+ */
+function rotr(n: number, b: number): number {
+  return (n >>> b) | (n << (32 - b));
+}
+
+/**
+ * SHA256 compression function
+ */
+function sha256Transform(W: number[], H: number[]): void {
+  let a = H[0];
+  let b = H[1];
+  let c = H[2];
+  let d = H[3];
+  let e = H[4];
+  let f = H[5];
+  let g = H[6];
+  let h = H[7];
+  
+  for (let j = 0; j < 64; j++) {
+    if (j >= 16) {
+      const s0 = rotr(W[j - 15], 7) ^ rotr(W[j - 15], 18) ^ (W[j - 15] >>> 3);
+      const s1 = rotr(W[j - 2], 17) ^ rotr(W[j - 2], 19) ^ (W[j - 2] >>> 10);
+      W[j] = (W[j - 16] + s0 + W[j - 7] + s1) >>> 0;
+    }
+    
+    const S1 = rotr(e, 6) ^ rotr(e, 11) ^ rotr(e, 25);
+    const ch = (e & f) ^ ((~e) & g);
+    const temp1 = (h + S1 + ch + K[j] + W[j]) >>> 0;
+    
+    const S0 = rotr(a, 2) ^ rotr(a, 13) ^ rotr(a, 22);
+    const maj = (a & b) ^ (a & c) ^ (b & c);
+    const temp2 = (S0 + maj) >>> 0;
+    
+    h = g;
+    g = f;
+    f = e;
+    e = (d + temp1) >>> 0;
+    d = c;
+    c = b;
+    b = a;
+    a = (temp1 + temp2) >>> 0;
+  }
+  
+  H[0] = (H[0] + a) >>> 0;
+  H[1] = (H[1] + b) >>> 0;
+  H[2] = (H[2] + c) >>> 0;
+  H[3] = (H[3] + d) >>> 0;
+  H[4] = (H[4] + e) >>> 0;
+  H[5] = (H[5] + f) >>> 0;
+  H[6] = (H[6] + g) >>> 0;
+  H[7] = (H[7] + h) >>> 0;
+}
+
+/**
+ * Calculate SHA256 hash from bytes
+ */
+export function sha256Fallback(bytes: Uint8Array): string {
+  const H_copy = [...H];
+  const msgLen = bytes.length;
+  const msgBitLen = msgLen * 8;
+  
+  // Padding
+  const padLen = (msgLen % 64 < 56) ? 56 - (msgLen % 64) : 120 - (msgLen % 64);
+  const padded = new Uint8Array(msgLen + padLen + 8);
+  padded.set(bytes);
+  padded[msgLen] = 0x80;
+  
+  // Append length (64-bit big-endian)
+  const dataView = new DataView(padded.buffer);
+  dataView.setUint32(padded.length - 8, 0, false); // high 32 bits
+  dataView.setUint32(padded.length - 4, msgBitLen >>> 0, false); // low 32 bits
+  
+  // Process blocks
+  for (let offset = 0; offset < padded.length; offset += 64) {
+    const W = new Array(64);
+    
+    // Copy block into W[0..15]
+    for (let i = 0; i < 16; i++) {
+      W[i] = dataView.getUint32(offset + i * 4, false);
+    }
+    
+    sha256Transform(W, H_copy);
+  }
+  
+  // Convert to hex string
+  let hex = '';
+  for (let i = 0; i < 8; i++) {
+    hex += H_copy[i].toString(16).padStart(8, '0');
+  }
+  
+  return hex;
+}