rand.mx raw

   1  // Copyright 2017 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  //go:build boringcrypto && linux && (amd64 || arm64) && !android && !msan
   6  
   7  package boring
   8  
   9  // #include "goboringcrypto.h"
  10  import "C"
  11  import "unsafe"
  12  
  13  type randReader int
  14  
  15  func (randReader) Read(b []byte) (int, error) {
  16  	// Note: RAND_bytes should never fail; the return value exists only for historical reasons.
  17  	// We check it even so.
  18  	if len(b) > 0 && C._goboringcrypto_RAND_bytes((*C.uint8_t)(unsafe.Pointer(&b[0])), C.size_t(len(b))) == 0 {
  19  		return 0, fail("RAND_bytes")
  20  	}
  21  	return len(b), nil
  22  }
  23  
  24  const RandReader = randReader(0)
  25