Function MD5

Hashes/MD5.js:153–202

* Hashes message using MD5 Cryptographic Hash Function * * @see * For more info: https://en.wikipedia.org/wiki/MD5 * * @param {Uint8Array} message - message to hash * @return {Uint8Array} - message digest (hash value)

(message)

 * @return {Uint8Array} - message digest (hash value)
 */
function MD5(message) {
  // Initialize variables:
  let [a0, b0, c0, d0] = [
    0x67452301 >>> 0,
    0xefcdab89 >>> 0,
    0x98badcfe >>> 0,
    0x10325476 >>> 0
  ]

  // pre-process message and split into 512 bit chunks
  const words = Array.from(preProcess(message))
  const chunks = chunkify(words, 16)

  chunks.forEach(function (chunk, _) {
    // initialize variables for this chunk
    let [A, B, C, D] = [a0, b0, c0, d0]

    for (let i = 0; i < 64; i++) {
      let [F, g] = [0, 0]

      if (i <= 15) {
        F = (B & C) | (~B & D)
        g = i
      } else if (i <= 31) {
        F = (D & B) | (~D & C)
        g = (5 * i + 1) % 16
      } else if (i <= 47) {
        F = B ^ C ^ D
        g = (3 * i + 5) % 16
      } else {
        F = C ^ (B | ~D)
        g = (7 * i) % 16
      }

      F = (F + A + K[i] + chunk[g]) >>> 0
      A = D
      D = C
      C = B
      B = ((B + rotateLeft(F, S[i])) & 0xffffffff) >>> 0
    }

    // add values for this chunk to main hash variables (unsigned)
    a0 = (a0 + A) >>> 0
    b0 = (b0 + B) >>> 0
    c0 = (c0 + C) >>> 0
    d0 = (d0 + D) >>> 0
  })

  return u32ToU8([a0, b0, c0, d0])
}

// export MD5 function
export { MD5 }