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hash.scala
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hash.scala
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/*
* Copyright (c) 2013 Functional Streams for Scala
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package fs2
import org.typelevel.scalaccompat.annotation._
import scala.scalajs.js
import scala.scalajs.js.annotation.JSImport
import scala.scalajs.js.typedarray.Uint8Array
/** Provides various cryptographic hashes as pipes. Supported only on Node.js. */
object hash {
/** Computes an MD2 digest. */
def md2[F[_]]: Pipe[F, Byte, Byte] = digest(createHash("md2"))
/** Computes an MD5 digest. */
def md5[F[_]]: Pipe[F, Byte, Byte] = digest(createHash("md5"))
/** Computes a SHA-1 digest. */
def sha1[F[_]]: Pipe[F, Byte, Byte] =
digest(createHash("sha1"))
/** Computes a SHA-256 digest. */
def sha256[F[_]]: Pipe[F, Byte, Byte] =
digest(createHash("sha256"))
/** Computes a SHA-384 digest. */
def sha384[F[_]]: Pipe[F, Byte, Byte] =
digest(createHash("sha384"))
/** Computes a SHA-512 digest. */
def sha512[F[_]]: Pipe[F, Byte, Byte] =
digest(createHash("sha512"))
/** Computes the digest of the source stream, emitting the digest as a chunk
* after completion of the source stream.
*/
private[this] def digest[F[_]](hash: => Hash): Pipe[F, Byte, Byte] =
in =>
Stream.suspend {
in.chunks
.fold(hash) { (d, c) =>
val bytes = c.toUint8Array
d.update(bytes)
d
}
.flatMap(d => Stream.chunk(Chunk.uint8Array(d.digest())))
}
@js.native
@JSImport("crypto", "createHash")
@nowarn212("cat=unused")
private[fs2] def createHash(algorithm: String): Hash = js.native
@js.native
@nowarn212("cat=unused")
private[fs2] trait Hash extends js.Object {
def update(data: Uint8Array): Unit = js.native
def digest(): Uint8Array = js.native
}
}