[dev.power64] code review 160200044: build: merge default into dev.power64

src/pkg/crypto/crypto.go

 // Copyright 2011 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // Package crypto collects common cryptographic constants.
 package crypto
 
 import (
         "hash"
         "io"
@@ skipping 106 matching lines @@
         Sign(rand io.Reader, msg []byte, opts SignerOpts) (signature []byte, err error)
 }
 
 // SignerOpts contains options for signing with a Signer.
 type SignerOpts interface {
         // HashFunc returns an identifier for the hash function used to produce
         // the message passed to Signer.Sign, or else zero to indicate that no
         // hashing was done.
         HashFunc() Hash
 }