1 files changed, 0 insertions, 96 deletions
diff --git a/libgo/go/crypto/block/cfb.go b/libgo/go/crypto/block/cfb.go
deleted file mode 100644
index f20c0a04f66..00000000000
--- a/libgo/go/crypto/block/cfb.go
+++ /dev/null
@@ -1,96 +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.
-
-// Cipher feedback (CFB) mode.
-
-// CFB provides confidentiality by feeding a fraction of
-// the previous ciphertext in as the plaintext for the next
-// block operation.
-
-// See NIST SP 800-38A, pp 11-13
-
-package block
-
-import (
-	"io"
-)
-
-type cfbCipher struct {
-	c          Cipher
-	blockSize  int // our block size (s/8)
-	cipherSize int // underlying cipher block size
-	iv         []byte
-	tmp        []byte
-}
-
-func newCFB(c Cipher, s int, iv []byte) *cfbCipher {
-	if s == 0 || s%8 != 0 {
-		panic("crypto/block: invalid CFB mode")
-	}
-	b := c.BlockSize()
-	x := new(cfbCipher)
-	x.c = c
-	x.blockSize = s / 8
-	x.cipherSize = b
-	x.iv = dup(iv)
-	x.tmp = make([]byte, b)
-	return x
-}
-
-func (x *cfbCipher) BlockSize() int { return x.blockSize }
-
-func (x *cfbCipher) Encrypt(dst, src []byte) {
-	// Encrypt old IV and xor prefix with src to make dst.
-	x.c.Encrypt(x.tmp, x.iv)
-	for i := 0; i < x.blockSize; i++ {
-		dst[i] = src[i] ^ x.tmp[i]
-	}
-
-	// Slide unused IV pieces down and insert dst at end.
-	for i := 0; i < x.cipherSize-x.blockSize; i++ {
-		x.iv[i] = x.iv[i+x.blockSize]
-	}
-	off := x.cipherSize - x.blockSize
-	for i := off; i < x.cipherSize; i++ {
-		x.iv[i] = dst[i-off]
-	}
-}
-
-func (x *cfbCipher) Decrypt(dst, src []byte) {
-	// Encrypt [sic] old IV and xor prefix with src to make dst.
-	x.c.Encrypt(x.tmp, x.iv)
-	for i := 0; i < x.blockSize; i++ {
-		dst[i] = src[i] ^ x.tmp[i]
-	}
-
-	// Slide unused IV pieces down and insert src at top.
-	for i := 0; i < x.cipherSize-x.blockSize; i++ {
-		x.iv[i] = x.iv[i+x.blockSize]
-	}
-	off := x.cipherSize - x.blockSize
-	for i := off; i < x.cipherSize; i++ {
-		// Reconstruct src = dst ^ x.tmp
-		// in case we overwrote src (src == dst).
-		x.iv[i] = dst[i-off] ^ x.tmp[i-off]
-	}
-}
-
-// NewCFBDecrypter returns a reader that reads data from r and decrypts it using c
-// in s-bit cipher feedback (CFB) mode with the initialization vector iv.
-// The returned Reader does not buffer or read ahead except
-// as required by the cipher's block size.
-// Modes for s not a multiple of 8 are unimplemented.
-func NewCFBDecrypter(c Cipher, s int, iv []byte, r io.Reader) io.Reader {
-	return NewECBDecrypter(newCFB(c, s, iv), r)
-}
-
-// NewCFBEncrypter returns a writer that encrypts data using c
-// in s-bit cipher feedback (CFB) mode with the initialization vector iv
-// and writes the encrypted data to w.
-// The returned Writer does no buffering except as required
-// by the cipher's block size, so there is no need for a Flush method.
-// Modes for s not a multiple of 8 are unimplemented.
-func NewCFBEncrypter(c Cipher, s int, iv []byte, w io.Writer) io.Writer {
-	return NewECBEncrypter(newCFB(c, s, iv), w)
-}