1 // Copyright 2010 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.
5 // Windows cryptographically secure pseudorandom number
16 // Implemented by using Windows CryptoAPI 2.0.
18 func init() { Reader = &rngReader{} }
20 // A rngReader satisfies reads by reading from the Windows CryptGenRandom API.
21 type rngReader struct {
26 func (r *rngReader) Read(b []byte) (n int, err error) {
29 const provType = syscall.PROV_RSA_FULL
30 const flags = syscall.CRYPT_VERIFYCONTEXT | syscall.CRYPT_SILENT
31 errno := syscall.CryptAcquireContext(&r.prov, nil, nil, provType, flags)
34 return 0, os.NewSyscallError("CryptAcquireContext", errno)
38 errno := syscall.CryptGenRandom(r.prov, uint32(len(b)), &b[0])
40 return 0, os.NewSyscallError("CryptGenRandom", errno)