crypto/sha3: update from golang.org/x/crypto/sha3 a 80b25ed4

This pulls in the assembly implementation of keccakf1600 for amd64.

crypto/sha3/keccakf.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//  +build !amd64 appengine gccgo
+
 package sha3
 
 // rc stores the round constants for use in the ι step.

crypto/sha3/keccakf_amd64.go

+// Copyright 2015 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.
+
+// +build amd64,!appengine,!gccgo
+
+package sha3
+
+// This function is implemented in keccakf_amd64.s.
+
+//go:noescape
+
+func keccakF1600(state *[25]uint64)

crypto/sha3/sha3.go

@@ -42,7 +42,7 @@ type state struct {
 	storage [maxRate]byte
 
 	// Specific to SHA-3 and SHAKE.
-	fixedOutput bool            // whether this is a fixed-ouput-length instance
+	fixedOutput bool            // whether this is a fixed-output-length instance
 	outputLen   int             // the default output size in bytes
 	state       spongeDirection // whether the sponge is absorbing or squeezing
 }

crypto/sha3/xor.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !amd64,!386 appengine
+// +build !amd64,!386,!ppc64le appengine
 
 package sha3
 

crypto/sha3/xor_unaligned.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64 386
+// +build amd64 386 ppc64le
 // +build !appengine
 
 package sha3