github.com/varialus/godfly@v0.0.0-20130904042352-1934f9f095ab/src/pkg/crypto/rc4/rc4_ref.go (about)

     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 += c.s[i]
    16  		c.s[i], c.s[j] = c.s[j], c.s[i]
    17  		dst[k] = v ^ c.s[c.s[i]+c.s[j]]
    18  	}
    19  	c.i, c.j = i, j
    20  }