1 files changed, 0 insertions, 66 deletions
diff --git a/src/pkg/crypto/cipher/ofb.go b/src/pkg/crypto/cipher/ofb.go
deleted file mode 100644
index e86ebcb23..000000000
--- a/src/pkg/crypto/cipher/ofb.go
+++ /dev/null
@@ -1,66 +0,0 @@
-// 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.
-
-// OFB (Output Feedback) Mode.
-
-package cipher
-
-type ofb struct {
-	b       Block
-	cipher  []byte
-	out     []byte
-	outUsed int
-}
-
-// NewOFB returns a Stream that encrypts or decrypts using the block cipher b
-// in output feedback mode. The initialization vector iv's length must be equal
-// to b's block size.
-func NewOFB(b Block, iv []byte) Stream {
-	blockSize := b.BlockSize()
-	if len(iv) != blockSize {
-		return nil
-	}
-	bufSize := streamBufferSize
-	if bufSize < blockSize {
-		bufSize = blockSize
-	}
-	x := &ofb{
-		b:       b,
-		cipher:  make([]byte, blockSize),
-		out:     make([]byte, 0, bufSize),
-		outUsed: 0,
-	}
-
-	copy(x.cipher, iv)
-	return x
-}
-
-func (x *ofb) refill() {
-	bs := x.b.BlockSize()
-	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)]
-	for remain < len(x.out)-bs {
-		x.b.Encrypt(x.cipher, x.cipher)
-		copy(x.out[remain:], x.cipher)
-		remain += bs
-	}
-	x.out = x.out[:remain]
-	x.outUsed = 0
-}
-
-func (x *ofb) 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
-	}
-}