com.github.jeroenr.bson.util.Converters.scala Maven / Gradle / Ivy

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package com.github.jeroenr.bson.util

/** Common functions */
object Converters {
  private val HEX_CHARS: Array[Char] = "0123456789abcdef".toCharArray()

  /** Turns an array of Byte into a String representation in hexadecimal. */
  def hex2Str(bytes: Array[Byte]): String = {
    val hex = new Array[Char](2 * bytes.length)
    var i = 0
    while (i < bytes.length) {
      hex(2 * i) = HEX_CHARS((bytes(i) & 0xF0) >>> 4)
      hex(2 * i + 1) = HEX_CHARS(bytes(i) & 0x0F)
      i = i + 1
    }
    new String(hex)
  }

  /** Turns a hexadecimal String into an array of Byte. */
  def str2Hex(str: String): Array[Byte] = {
    val bytes = new Array[Byte](str.length / 2)
    var i = 0
    while (i < bytes.length) {
      bytes(i) = Integer.parseInt(str.substring(2 * i, 2 * i + 2), 16).toByte
      i += 1
    }
    bytes
  }

  /** Computes the MD5 hash of the given String. */
  def md5(s: String): Array[Byte] = java.security.MessageDigest.getInstance("MD5").digest(s.getBytes)

  /** Computes the MD5 hash of the given Array of Bytes. */
  def md5(array: Array[Byte]): Array[Byte] = java.security.MessageDigest.getInstance("MD5").digest(array)

  /** Computes the MD5 hash of the given String and turns it into a hexadecimal String representation. */
  def md5Hex(s: String): String = hex2Str(md5(s))
}