如何在Go中向函数发送切片？

问题描述：

I'm rewriting some C code in Go. And in my C code I have stuff like this:

static void sharedb(unsigned char *sharedkey, unsigned char *send,
                    const unsigned char *received) {
    unsigned char krq[96]; 
    unsigned char buf[64];
    // rest removed for brevity

    indcpa_enc(send, buf, received, krq + 32);
}

Where indcpa_enc function is defined like this:

static void indcpa_enc(unsigned char *c,
                       const unsigned char *m,
                       const unsigned char *pk,
                       const unsigned char *coins)

So, in my Go code instead of using char arrays I used byte arrays. Where I have something like this:

func SharedB(sharedKey, send, received []byte) {
    var krq [96]byte
    var buf [64]byte

    // rest removed for brevity

    INDCPAEnc(send[:], buf[:SharedKeyBytes], received[:], krq[32:32+CoinBytes])
}

Where INDCPAEnc function is defined like this:

func INDCPAEnc(c []byte, m [SharedKeyBytes]byte, pk []byte, coins [CoinBytes]byte)

Though, this function call in Go gives me an array, regarding type mismatch. How can I convert a C code like above to a proper Go code? Also, should I use the pointer notation * for my Go function parameters as in C?

我正在用Go重写一些C代码。在我的C代码中，我有这样的东西： p>

  static void sharedb（unsigned char * sharedkey，unsigned char * send，
 const unsigned char * received）{
  unsigned char krq [96];  
 unsigned char buf [64]; 
 //为简洁起见，删除其余部分
 
 indcpa_enc（发送，buf，已接收，krq + 32）; 
} 
  code>  pre> 
 \  n 其中 indcpa_enc  code>函数的定义如下： p> 
 
 
  static void indcpa_enc（unsigned char * c，
 const unsigned char * m，  
 const unsigned char * pk，
 const unsigned char * coins）
  code>  pre> 
 
 因此，在我的Go代码中，而不是使用 char  code> 数组我使用了 byte  code>数组。 我有这样的地方： p> 
 
 
  func SharedB（sharedKey，发送，接收[] byte）{
 var krq [96] byte 
 var buf [64] byte  
 
 //为了简洁起见，删除其余部分
 
 INDCPAEnc（发送[：]，buf [：SharedKeyBytes]，接收[：]，krq [32：32 + CoinBytes]）
} 
  code>   pre> 
 
 函数 INDCPAEnc  code>的定义如下： p> 
 
 
  func INDCPAEnc（c [] byte，m [  SharedKeyBytes] byte，pk [] byte，硬币[CoinBytes] byte）
  code>  pre> 
 
 尽管如此，Go中的此函数调用为我提供了一个有关类型不匹配的数组。 如何将上述C代码转换为正确的Go代码？ 另外，我是否应该像在C中那样将指针符号 *  code>用于Go函数参数？ p> 
  div>

答

The parameters that specify a length (e.g. [SharedKeyBytes]byte) are arrays, not slices; therefor, you cannot pass a slice, hence the type mismatch error. You can either:

Change the parameter type to slice ([]byte)
Copy the slice to an appropriately-sized array prior to calling the function, then pass the array to the function instead of the slice (playground example)

如何在Go中向函数发送切片？

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