diff options
Diffstat (limited to 'gcc-4.8.1/libgo/go/crypto/rc4/rc4.go')
-rw-r--r-- | gcc-4.8.1/libgo/go/crypto/rc4/rc4.go | 63 |
1 files changed, 0 insertions, 63 deletions
diff --git a/gcc-4.8.1/libgo/go/crypto/rc4/rc4.go b/gcc-4.8.1/libgo/go/crypto/rc4/rc4.go deleted file mode 100644 index 1bb278f74..000000000 --- a/gcc-4.8.1/libgo/go/crypto/rc4/rc4.go +++ /dev/null @@ -1,63 +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. - -// Package rc4 implements RC4 encryption, as defined in Bruce Schneier's -// Applied Cryptography. -package rc4 - -// BUG(agl): RC4 is in common use but has design weaknesses that make -// it a poor choice for new protocols. - -import "strconv" - -// A Cipher is an instance of RC4 using a particular key. -type Cipher struct { - s [256]byte - i, j uint8 -} - -type KeySizeError int - -func (k KeySizeError) Error() string { - return "crypto/rc4: invalid key size " + strconv.Itoa(int(k)) -} - -// NewCipher creates and returns a new Cipher. The key argument should be the -// RC4 key, at least 1 byte and at most 256 bytes. -func NewCipher(key []byte) (*Cipher, error) { - k := len(key) - if k < 1 || k > 256 { - return nil, KeySizeError(k) - } - var c Cipher - for i := 0; i < 256; i++ { - c.s[i] = uint8(i) - } - var j uint8 = 0 - for i := 0; i < 256; i++ { - j += c.s[i] + key[i%k] - c.s[i], c.s[j] = c.s[j], c.s[i] - } - return &c, nil -} - -// XORKeyStream sets dst to the result of XORing src with the key stream. -// Dst and src may be the same slice but otherwise should not overlap. -func (c *Cipher) XORKeyStream(dst, src []byte) { - for i := range src { - c.i += 1 - c.j += c.s[c.i] - c.s[c.i], c.s[c.j] = c.s[c.j], c.s[c.i] - dst[i] = src[i] ^ c.s[c.s[c.i]+c.s[c.j]] - } -} - -// Reset zeros the key data so that it will no longer appear in the -// process's memory. -func (c *Cipher) Reset() { - for i := range c.s { - c.s[i] = 0 - } - c.i, c.j = 0, 0 -} |