1 files changed, 0 insertions, 76 deletions
diff --git a/src/pkg/crypto/cipher/ctr.go b/src/pkg/crypto/cipher/ctr.go
deleted file mode 100644
index 70ac40f6a..000000000
--- a/src/pkg/crypto/cipher/ctr.go
+++ /dev/null
@@ -1,76 +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.
-
-// Counter (CTR) mode.
-
-// CTR converts a block cipher into a stream cipher by
-// repeatedly encrypting an incrementing counter and
-// xoring the resulting stream of data with the input.
-
-// See NIST SP 800-38A, pp 13-15
-
-package cipher
-
-type ctr struct {
-	b       Block
-	ctr     []byte
-	out     []byte
-	outUsed int
-}
-
-const streamBufferSize = 512
-
-// NewCTR returns a Stream which encrypts/decrypts using the given Block in
-// counter mode. The length of iv must be the same as the Block's block size.
-func NewCTR(block Block, iv []byte) Stream {
-	if len(iv) != block.BlockSize() {
-		panic("cipher.NewCTR: IV length must equal block size")
-	}
-	bufSize := streamBufferSize
-	if bufSize < block.BlockSize() {
-		bufSize = block.BlockSize()
-	}
-	return &ctr{
-		b:       block,
-		ctr:     dup(iv),
-		out:     make([]byte, 0, bufSize),
-		outUsed: 0,
-	}
-}
-
-func (x *ctr) refill() {
-	remain := len(x.out) - x.outUsed
-	if remain > x.outUsed {
-		return
-	}
-	copy(x.out, x.out[x.outUsed:])
-	x.out = x.out[:cap(x.out)]
-	bs := x.b.BlockSize()
-	for remain < len(x.out)-bs {
-		x.b.Encrypt(x.out[remain:], x.ctr)
-		remain += bs
-
-		// Increment counter
-		for i := len(x.ctr) - 1; i >= 0; i-- {
-			x.ctr[i]++
-			if x.ctr[i] != 0 {
-				break
-			}
-		}
-	}
-	x.out = x.out[:remain]
-	x.outUsed = 0
-}
-
-func (x *ctr) XORKeyStream(dst, src []byte) {
-	for len(src) > 0 {
-		if x.outUsed >= len(x.out)-x.b.BlockSize() {
-			x.refill()
-		}
-		n := xorBytes(dst, src, x.out[x.outUsed:])
-		dst = dst[n:]
-		src = src[n:]
-		x.outUsed += n
-	}
-}