SHA-224 Cryptographic Hash Function

// SHA-224 implementation in JavaScript
function sha224(input) {
  // Initial hash values (SHA-224 specific)
  const H = [
    0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939,
    0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4
  ];
  
  // SHA-256 round constants
  const K = [
    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
  ];
  
  // Convert string to UTF-8 bytes
  function stringToBytes(str) {
    const encoder = new TextEncoder();
    return encoder.encode(str);
  }
  
  // Right rotate a 32-bit number
  function rightRotate(value, amount) {
    return ((value >>> amount) | (value << (32 - amount))) >>> 0;
  }
  
  // Process the message
  function process() {
    // Convert input to bytes and add padding
    let bytes = (typeof input === 'string') ? stringToBytes(input) : input;
    const originalLength = bytes.length * 8;
    
    // Append the bit '1' to the message
    bytes = [...bytes, 0x80];
    
    // Append padding zeros
    while ((bytes.length % 64) !== 56) {
      bytes.push(0);
    }
    
    // Append the length as a 64-bit big-endian integer
    const lengthBytes = new Array(8);
    for (let i = 7; i >= 0; i--) {
      lengthBytes[7 - i] = (originalLength >>> (i * 8)) & 0xff;
    }
    bytes.push(...lengthBytes);
    
    // Process each 64-byte chunk
    for (let i = 0; i < bytes.length; i += 64) {
      // Create message schedule array
      const W = new Array(64);
      
      // Copy chunk into first 16 words of W
      for (let j = 0; j < 16; j++) {
        W[j] = (bytes[i + j * 4] << 24) | 
               (bytes[i + j * 4 + 1] << 16) | 
               (bytes[i + j * 4 + 2] << 8) | 
               (bytes[i + j * 4 + 3]);
      }
      
      // Extend the first 16 words into remaining 48 words
      for (let j = 16; j < 64; j++) {
        const s0 = rightRotate(W[j - 15], 7) ^ 
                   rightRotate(W[j - 15], 18) ^ 
                   (W[j - 15] >>> 3);
                   
        const s1 = rightRotate(W[j - 2], 17) ^ 
                   rightRotate(W[j - 2], 19) ^ 
                   (W[j - 2] >>> 10);
                   
        W[j] = (W[j - 16] + s0 + W[j - 7] + s1) >>> 0;
      }
      
      // Initialize working variables
      let [a, b, c, d, e, f, g, h] = H;
      
      // Main loop
      for (let j = 0; j < 64; j++) {
        const S1 = rightRotate(e, 6) ^ 
                   rightRotate(e, 11) ^ 
                   rightRotate(e, 25);
                   
        const ch = (e & f) ^ (~e & g);
        const temp1 = (h + S1 + ch + K[j] + W[j]) >>> 0;
        
        const S0 = rightRotate(a, 2) ^ 
                   rightRotate(a, 13) ^ 
                   rightRotate(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;
      }
      
      // Add to hash values
      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;
    }
    
    // Produce the final hash (for SHA-224, only use first 7 words)
    let result = '';
    for (let i = 0; i < 7; i++) {
      result += H[i].toString(16).padStart(8, '0');
    }
    
    return result;
  }
  
  return process();
}