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Imported Upstream version 6.4.0.137

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Former-commit-id: 943baa9f16a098c33e129777827f3a9d20da00d6
This commit is contained in:
Xamarin Public Jenkins (auto-signing)
2019-07-26 19:53:28 +00:00
parent e9207cf623
commit ef583813eb
2712 changed files with 74169 additions and 40587 deletions
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37
mcs/class/corlib/System/Guid.cs
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@ -38,44 +38,13 @@ namespace System
{
partial struct Guid
{
private static object _rngAccess = new object ();
private static RandomNumberGenerator _rng;
private static RandomNumberGenerator _fastRng;
public static Guid NewGuid ()
{
byte[] b = new byte [16];
// thread-safe access to the prng
lock (_rngAccess) {
if (_rng == null)
_rng = RandomNumberGenerator.Create ();
_rng.GetBytes (b);
}
Guid res = new Guid (b);
// Mask in Variant 1-0 in Bit[7..6]
res._d = (byte) ((res._d & 0x3fu) | 0x80u);
// Mask in Version 4 (random based Guid) in Bits[15..13]
res._c = (short) ((res._c & 0x0fffu) | 0x4000u);
return res;
}
// used in ModuleBuilder so mcs doesn't need to invoke
// CryptoConfig for simple assemblies.
internal static byte[] FastNewGuidArray ()
internal static unsafe byte[] FastNewGuidArray ()
{
byte[] guid = new byte [16];
// thread-safe access to the prng
lock (_rngAccess) {
// if known, use preferred RNG
if (_rng != null)
_fastRng = _rng;
// else use hardcoded default RNG (bypassing CryptoConfig)
if (_fastRng == null)
_fastRng = new RNGCryptoServiceProvider ();
_fastRng.GetBytes (guid);
fixed (byte *ptr = guid) {
Interop.GetRandomBytes(ptr, 16);
}
// Mask in Variant 1-0 in Bit[7..6]