1 files changed, 0 insertions, 57 deletions
diff --git a/src/pkg/crypto/subtle/constant_time.go b/src/pkg/crypto/subtle/constant_time.go
deleted file mode 100644
index 57dbe9db5..000000000
--- a/src/pkg/crypto/subtle/constant_time.go
+++ /dev/null
@@ -1,57 +0,0 @@
-// Copyright 2009 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 subtle implements functions that are often useful in cryptographic
-// code but require careful thought to use correctly.
-package subtle
-
-// ConstantTimeCompare returns 1 iff the two equal length slices, x
-// and y, have equal contents. The time taken is a function of the length of
-// the slices and is independent of the contents.
-func ConstantTimeCompare(x, y []byte) int {
-	var v byte
-
-	for i := 0; i < len(x); i++ {
-		v |= x[i] ^ y[i]
-	}
-
-	return ConstantTimeByteEq(v, 0)
-}
-
-// ConstantTimeSelect returns x if v is 1 and y if v is 0.
-// Its behavior is undefined if v takes any other value.
-func ConstantTimeSelect(v, x, y int) int { return ^(v-1)&x | (v-1)&y }
-
-// ConstantTimeByteEq returns 1 if x == y and 0 otherwise.
-func ConstantTimeByteEq(x, y uint8) int {
-	z := ^(x ^ y)
-	z &= z >> 4
-	z &= z >> 2
-	z &= z >> 1
-
-	return int(z)
-}
-
-// ConstantTimeEq returns 1 if x == y and 0 otherwise.
-func ConstantTimeEq(x, y int32) int {
-	z := ^(x ^ y)
-	z &= z >> 16
-	z &= z >> 8
-	z &= z >> 4
-	z &= z >> 2
-	z &= z >> 1
-
-	return int(z & 1)
-}
-
-// ConstantTimeCopy copies the contents of y into x iff v == 1. If v == 0, x is left unchanged.
-// Its behavior is undefined if v takes any other value.
-func ConstantTimeCopy(v int, x, y []byte) {
-	xmask := byte(v - 1)
-	ymask := byte(^(v - 1))
-	for i := 0; i < len(x); i++ {
-		x[i] = x[i]&xmask | y[i]&ymask
-	}
-	return
-}