libgo/go/crypto/rc4/rc4_ref.go

   1 // Copyright 2013 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // +build !amd64,!arm,!386
   6
   7 package rc4
   8
   9 // XORKeyStream sets dst to the result of XORing src with the key stream.
  10 // Dst and src may be the same slice but otherwise should not overlap.
  11 func (c *Cipher) XORKeyStream(dst, src []byte) {
  12         i, j := c.i, c.j
  13         for k, v := range src {
  14                 i += 1
  15                 j += uint8(c.s[i])
  16                 c.s[i], c.s[j] = c.s[j], c.s[i]
  17                 dst[k] = v ^ uint8(c.s[uint8(c.s[i]+c.s[j])])
  18         }
  19         c.i, c.j = i, j
  20 }