From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001
From: upstream source tree <ports@midipix.org>
Date: Sun, 15 Mar 2015 20:14:05 -0400
Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified
 gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream
 tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.
---
 libgo/go/crypto/cipher/cfb.go | 64 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 libgo/go/crypto/cipher/cfb.go

(limited to 'libgo/go/crypto/cipher/cfb.go')

diff --git a/libgo/go/crypto/cipher/cfb.go b/libgo/go/crypto/cipher/cfb.go
new file mode 100644
index 000000000..d14165a86
--- /dev/null
+++ b/libgo/go/crypto/cipher/cfb.go
@@ -0,0 +1,64 @@
+// 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++
+	}
+}
-- 
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