add strong naming support for netstandard

Mono.Cecil/ModuleDefinition.cs

@@ -13,6 +13,11 @@
 using System.IO;
 using System.Threading;
 using SR = System.Reflection;
+#if (NETSTANDARD)
+using StrongNameKeyPair=Mono.Security.Cryptography.StrongNameKeyPair;
+#else
+using StrongNameKeyPair=System.Reflection.StrongNameKeyPair;
+#endif
 
 using Mono.Cecil.Cil;
 using Mono.Cecil.Metadata;
@@ -185,7 +190,7 @@ public sealed class WriterParameters {
 		bool write_symbols;
 		byte [] key_blob;
 		string key_container;
-		SR.StrongNameKeyPair key_pair;
+		StrongNameKeyPair key_pair;
 
 		public uint? Timestamp {
 			get { return timestamp; }
@@ -221,7 +226,7 @@ public string StrongNameKeyContainer {
 			set { key_container = value; }
 		}
 
-		public SR.StrongNameKeyPair StrongNameKeyPair {
+		public StrongNameKeyPair StrongNameKeyPair {
 			get { return key_pair; }
 			set { key_pair = value; }
 		}

Mono.Cecil/StrongNameKeyPair.cs

@@ -0,0 +1,132 @@
+#if (NETSTANDARD)
+using System;
+using System.IO;
+using System.Runtime.Serialization;
+using System.Security;
+using System.Security.Cryptography;
+
+namespace Mono.Security.Cryptography {
+	[Serializable]
+	public class StrongNameKeyPair : ISerializable {
+		bool _keyPairExported;
+		byte [] _keyPairArray;
+		string _keyPairContainer;
+		byte [] _publicKey;
+
+		public byte [] PublicKey {
+			[SecuritySafeCritical]
+			get {
+				if (_publicKey == null) {
+					_publicKey = ComputePublicKey ();
+				}
+
+				byte [] array = new byte[_publicKey.Length];
+				Array.Copy (_publicKey, array, _publicKey.Length);
+				return array;
+			}
+		}
+
+		public StrongNameKeyPair (FileStream keyPairFile)
+		{
+			if (keyPairFile == null) {
+				throw new ArgumentNullException ("keyPairFile");
+			}
+
+			var num = (int) keyPairFile.Length;
+			_keyPairArray = new byte[num];
+			keyPairFile.Read (_keyPairArray, 0, num);
+			_keyPairExported = true;
+		}
+
+		public StrongNameKeyPair (byte [] keyPairArray)
+		{
+			if (keyPairArray == null) {
+				throw new ArgumentNullException ("keyPairArray");
+			}
+
+			_keyPairArray = new byte[keyPairArray.Length];
+			Array.Copy (keyPairArray, _keyPairArray, keyPairArray.Length);
+			_keyPairExported = true;
+		}
+
+		public StrongNameKeyPair (string keyPairContainer)
+		{
+			if (keyPairContainer == null) {
+				throw new ArgumentNullException ("keyPairContainer");
+			}
+
+			_keyPairContainer = keyPairContainer;
+			_keyPairExported = false;
+		}
+
+		protected StrongNameKeyPair (SerializationInfo info, StreamingContext context)
+		{
+			_keyPairExported = (bool) info.GetValue ("_keyPairExported", typeof(bool));
+			_keyPairArray = (byte []) info.GetValue ("_keyPairArray", typeof(byte []));
+			_keyPairContainer = (string) info.GetValue ("_keyPairContainer", typeof(string));
+			_publicKey = (byte []) info.GetValue ("_publicKey", typeof(byte []));
+		}
+
+		byte [] ComputePublicKey ()
+		{
+			using (var rsa = Mixin.CreateRSA (this)) {
+				var cspBlob = ToCapiPublicKeyBlob (rsa);
+				var publicKey = new byte[12 + cspBlob.Length];
+				Buffer.BlockCopy (cspBlob, 0, publicKey, 12, cspBlob.Length);
+				// The first 12 bytes are documented at:
+				// http://msdn.microsoft.com/library/en-us/cprefadd/html/grfungethashfromfile.asp
+				// ALG_ID - Signature
+				publicKey [1] = 36;
+				// ALG_ID - Hash
+				publicKey [4] = 4;
+				publicKey [5] = 128;
+				// Length of Public Key (in bytes)
+				publicKey [8] = (byte) (cspBlob.Length >> 0);
+				publicKey [9] = (byte) (cspBlob.Length >> 8);
+				publicKey [10] = (byte) (cspBlob.Length >> 16);
+				publicKey [11] = (byte) (cspBlob.Length >> 24);
+				return publicKey;
+			}
+		}
+
+		void ISerializable.GetObjectData (SerializationInfo info, StreamingContext context)
+		{
+			info.AddValue ("_keyPairExported", _keyPairExported);
+			info.AddValue ("_keyPairArray", _keyPairArray);
+			info.AddValue ("_keyPairContainer", _keyPairContainer);
+			info.AddValue ("_publicKey", _publicKey);
+		}
+
+		static byte [] ToCapiPublicKeyBlob (RSA rsa)
+		{
+			var rsap = rsa.ExportParameters (false);
+			var blob = new byte[rsap.Modulus.Length + 20];
+			blob [0] = 0x06; // PUBLICKEYBLOB (0x06)
+			blob [1] = 0x02; // Version (0x02)
+			blob [2] = 0x00; // Reserved (word)
+			blob [3] = 0x00;
+			blob [5] = 0x24; // ALGID
+			WriteUInt32LE (blob, 8, 0x31415352); // DWORD magic = RSA1
+			WriteUInt32LE (blob, 12, (uint) rsap.Modulus.Length << 3); // DWORD bitlen
+
+			// DWORD public exponent
+			blob [18] = rsap.Exponent [0];
+			blob [17] = rsap.Exponent [1];
+			blob [16] = rsap.Exponent [2];
+
+			// BYTE modulus[rsapubkey.bitlen/8];
+			Array.Reverse (rsap.Modulus);
+			Buffer.BlockCopy (rsap.Modulus, 0, blob, 20, rsap.Modulus.Length);
+			return blob;
+		}
+
+		static void WriteUInt32LE (byte [] bytes, int offset, uint value)
+		{
+			bytes [offset + 3] = (byte) (value >> 24);
+			bytes [offset + 2] = (byte) (value >> 16);
+			bytes [offset + 1] = (byte) (value >> 8);
+			bytes [offset] = (byte) value;
+		}
+	}
+}
+#endif

Mono.Security.Cryptography/CryptoService.cs

@@ -10,7 +10,11 @@
 
 using System;
 using System.IO;
-using System.Reflection;
+#if (NETSTANDARD)
+using StrongNameKeyPair=Mono.Security.Cryptography.StrongNameKeyPair;
+#else
+using StrongNameKeyPair=System.Reflection.StrongNameKeyPair;
+#endif
 using System.Security.Cryptography;
 using System.Runtime.Serialization;
 
@@ -191,6 +195,20 @@ public static RSA CreateRSA (this WriterParameters writer_parameters)
 			return new RSACryptoServiceProvider (parameters);
 		}
 
+		public static RSA CreateRSA (this StrongNameKeyPair key_pair)
+		{
+			if (!TryGetKeyContainer (key_pair, out var key, out var key_container))
+				return CryptoConvert.FromCapiKeyBlob (key);
+
+			var parameters = new CspParameters {
+				Flags = CspProviderFlags.UseMachineKeyStore,
+				KeyContainerName = key_container,
+				KeyNumber = 2,
+			};
+
+			return new RSACryptoServiceProvider (parameters);
+		}
+
 		static bool TryGetKeyContainer (ISerializable key_pair, out byte [] key, out string key_container)
 		{
 			var info = new SerializationInfo (typeof (StrongNameKeyPair), new FormatterConverter ());