Digest.scala

import java.security.MessageDigest

abstract class Digest(algorithm: String) {
  val digest = MessageDigest.getInstance(algorithm)

  def hexdigest(value: String) : String = hexdigest(value.getBytes())
  def hexdigest(value: Array[Byte]) : String = {
    byte2hexstring(digest.digest())
  }

  private def byte2hexstring(value: Array[Byte]) : String = {
    var hex = ""
    value.foreach { b =>
      hex += Integer.toHexString((b >> 4) & 0x0f)
      hex += Integer.toHexString(b & 0x0f)
    }
    hex
  }
}

object MD5 extends Digest("MD5")
object SHA1 extends Digest("SHA1")
object SHA256 extends Digest("SHA-256")
object SHA384 extends Digest("SHA-384")
object SHA512 extends Digest("SHA-512")