Imported Upstream version 1.4upstream/1.4

1 files changed, 0 insertions, 72 deletions

diff --git a/src/pkg/crypto/cipher/cfb.go b/src/pkg/crypto/cipher/cfb.go
deleted file mode 100644
index 9b4eebf5b..000000000
--- a/src/pkg/crypto/cipher/cfb.go
+++ /dev/null
@@ -1,72 +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
-	next    []byte
-	out     []byte
-	outUsed int
-
-	decrypt bool
-}
-
-func (x *cfb) XORKeyStream(dst, src []byte) {
-	for len(src) > 0 {
-		if x.outUsed == len(x.out) {
-			x.b.Encrypt(x.out, x.next)
-			x.outUsed = 0
-		}
-
-		if x.decrypt {
-			// We can precompute a larger segment of the
-			// keystream on decryption. This will allow
-			// larger batches for xor, and we should be
-			// able to match CTR/OFB performance.
-			copy(x.next[x.outUsed:], src)
-		}
-		n := xorBytes(dst, src, x.out[x.outUsed:])
-		if !x.decrypt {
-			copy(x.next[x.outUsed:], dst)
-		}
-		dst = dst[n:]
-		src = src[n:]
-		x.outUsed += n
-	}
-}
-
-// 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 {
-		// stack trace will indicate whether it was de or encryption
-		panic("cipher.newCFB: IV length must equal block size")
-	}
-	x := &cfb{
-		b:       block,
-		out:     make([]byte, blockSize),
-		next:    make([]byte, blockSize),
-		outUsed: blockSize,
-		decrypt: decrypt,
-	}
-	copy(x.next, iv)
-
-	return x
-}