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Source file src/crypto/rc4/rc4_asm.go

Documentation: crypto/rc4

     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 amd64p32 arm,!nacl 386
     6  
     7  package rc4
     8  
     9  import "crypto/internal/subtle"
    10  
    11  func xorKeyStream(dst, src *byte, n int, state *[256]uint32, i, j *uint8)
    12  
    13  // XORKeyStream sets dst to the result of XORing src with the key stream.
    14  // Dst and src must overlap entirely or not at all.
    15  func (c *Cipher) XORKeyStream(dst, src []byte) {
    16  	if len(src) == 0 {
    17  		return
    18  	}
    19  	if len(dst) < len(src) {
    20  		panic("crypto/cipher: output smaller than input")
    21  	}
    22  	if subtle.InexactOverlap(dst[:len(src)], src) {
    23  		panic("crypto/cipher: invalid buffer overlap")
    24  	}
    25  	xorKeyStream(&dst[0], &src[0], len(src), &c.s, &c.i, &c.j)
    26  }
    27  

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