1 files changed, 0 insertions, 64 deletions
diff --git a/src/pkg/crypto/cipher/cfb.go b/src/pkg/crypto/cipher/cfb.go
deleted file mode 100644
index d14165a86..000000000
--- a/src/pkg/crypto/cipher/cfb.go
+++ /dev/null
@@ -1,64 +0,0 @@
-// Copyright 2010 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.
-
-// CFB (Cipher Feedback) Mode.
-
-package cipher
-
-type cfb struct {
-	b       Block
-	out     []byte
-	outUsed int
-	decrypt bool
-}
-
-// NewCFBEncrypter returns a Stream which encrypts with cipher feedback mode,
-// using the given Block. The iv must be the same length as the Block's block
-// size.
-func NewCFBEncrypter(block Block, iv []byte) Stream {
-	return newCFB(block, iv, false)
-}
-
-// NewCFBDecrypter returns a Stream which decrypts with cipher feedback mode,
-// using the given Block. The iv must be the same length as the Block's block
-// size.
-func NewCFBDecrypter(block Block, iv []byte) Stream {
-	return newCFB(block, iv, true)
-}
-
-func newCFB(block Block, iv []byte, decrypt bool) Stream {
-	blockSize := block.BlockSize()
-	if len(iv) != blockSize {
-		return nil
-	}
-
-	x := &cfb{
-		b:       block,
-		out:     make([]byte, blockSize),
-		outUsed: 0,
-		decrypt: decrypt,
-	}
-	block.Encrypt(x.out, iv)
-
-	return x
-}
-
-func (x *cfb) XORKeyStream(dst, src []byte) {
-	for i := 0; i < len(src); i++ {
-		if x.outUsed == len(x.out) {
-			x.b.Encrypt(x.out, x.out)
-			x.outUsed = 0
-		}
-
-		if x.decrypt {
-			t := src[i]
-			dst[i] = src[i] ^ x.out[x.outUsed]
-			x.out[x.outUsed] = t
-		} else {
-			x.out[x.outUsed] ^= src[i]
-			dst[i] = x.out[x.outUsed]
-		}
-		x.outUsed++
-	}
-}