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#if MYSQL_6_10
// Copyright © 2017, 2018, Oracle and/or its affiliates. All rights reserved.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
// MySQL Connectors. There are special exceptions to the terms and
// conditions of the GPLv2 as it is applied to this software, see the
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
#if NETSTANDARD1_3
using AliasText = Externals.MySql.Data.MySqlClient.Framework.NetStandard1_3;
#else
using AliasText = System.Text;
#endif
namespace Externals.MySql.Data.MySqlClient.Authentication
{
internal class MySqlPemReader
{
#if NETSTANDARD1_3
public static RSA ConvertPemToRSAProvider(byte[] rawPublicKey)
#else
public static RSACryptoServiceProvider ConvertPemToRSAProvider(byte[] rawPublicKey)
#endif
{
byte[] decodedKey = DecodeOpenSslKey(rawPublicKey);
return DecodeX509Key(decodedKey);
}
#if NETSTANDARD1_3
static RSA DecodeX509Key(byte[] key)
#else
static RSACryptoServiceProvider DecodeX509Key(byte[] key)
#endif
{
if (key == null) return null;
byte[] oidSequence = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 };
using (var memoryStream = new MemoryStream(key))
{
using (var reader = new BinaryReader(memoryStream))
{
try
{
var bytes = reader.ReadUInt16();
switch (bytes)
{
case 0x8130:
reader.ReadByte();
break;
case 0x8230:
reader.ReadInt16();
break;
default:
return null;
}
var sequence = reader.ReadBytes(15);
// Compare arrays.
bool arraysAreEqual = true;
if (sequence.Length == oidSequence.Length)
{
for (int i = 0; i < oidSequence.Length; i++)
if (sequence[i] != oidSequence[i])
{
arraysAreEqual = false;
}
}
if (!arraysAreEqual) return null;
bytes = reader.ReadUInt16();
if (bytes == 0x8103) reader.ReadByte();
else if (bytes == 0x8203) reader.ReadInt16();
else return null;
if (reader.ReadByte() != 0x00) return null;
bytes = reader.ReadUInt16();
if (bytes == 0x8130) reader.ReadByte();
else if (bytes == 0x8230) reader.ReadInt16();
else return null;
bytes = reader.ReadUInt16();
byte lowByte = 0x00;
byte highByte = 0x00;
if (bytes == 0x8102) lowByte = reader.ReadByte();
else if (bytes == 0x8202)
{
highByte = reader.ReadByte();
lowByte = reader.ReadByte();
}
else return null;
int modulusSize = BitConverter.ToInt32(new byte[] { lowByte, highByte, 0x00, 0x00 }, 0);
byte firstByte = reader.ReadByte();
reader.BaseStream.Seek(-1, SeekOrigin.Current);
if (firstByte == 0x00)
{
reader.ReadByte();
modulusSize -= 1;
}
// Read modulus.
byte[] modulus = reader.ReadBytes(modulusSize);
if (reader.ReadByte() != 0x02) return null;
// Read exponent.
byte[] exponent = reader.ReadBytes(reader.ReadByte());
#if NETSTANDARD1_3
RSA rsa = RSA.Create();
#else
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
#endif
RSAParameters rsaKeyInfo = new RSAParameters
{
Modulus = modulus,
Exponent = exponent
};
rsa.ImportParameters(rsaKeyInfo);
return rsa;
}
catch (Exception)
{
return null;
}
}
}
}
static byte[] DecodeOpenSslKey(byte[] rawPublicKey)
{
if (rawPublicKey == null) return null;
// Remove line breaks and carriage returns.
rawPublicKey = rawPublicKey.Where(b => b != 0x0D).ToArray();
rawPublicKey = rawPublicKey.Where(b => b != 0x0A).ToArray();
// Trim.
rawPublicKey = TrimByteArray(rawPublicKey);
// Remove header and footer
byte[] headerSequence = { 0x2D, 0x2D, 0x2D, 0x2D, 0x2D, 0x42, 0x45, 0x47, 0x49, 0x4E, 0x20, 0x50, 0x55, 0x42, 0x4C, 0x49, 0x43, 0x20, 0x4B, 0x45, 0x59, 0x2D, 0x2D, 0x2D, 0x2D, 0x2D };
byte[] footerSequence = { 0x2D, 0x2D, 0x2D, 0x2D, 0x2D, 0x45, 0x4E, 0x44, 0x20, 0x50, 0x55, 0x42, 0x4C, 0x49, 0x43, 0x20, 0x4B, 0x45, 0x59, 0x2D, 0x2D, 0x2D, 0x2D, 0x2D };
if (!StartsWith(rawPublicKey, headerSequence) || !EndsWith(rawPublicKey, footerSequence)) return null;
byte[] formattedRawPublicKey = new byte[rawPublicKey.Length - headerSequence.Length - footerSequence.Length];
Array.Copy(rawPublicKey, headerSequence.Length, formattedRawPublicKey, 0, formattedRawPublicKey.Length);
byte[] binaryKey;
try
{
binaryKey = Convert.FromBase64String(AliasText.Encoding.Default.GetString(formattedRawPublicKey));
}
catch (FormatException)
{
return null;
}
return binaryKey;
}
static byte[] DecodeOpenSslKey2(byte[] rawPublicKey)
{
if (rawPublicKey == null) return null;
var pem = AliasText.Encoding.Default.GetString(rawPublicKey);
pem = pem.Replace(Environment.NewLine, "");
const string header = "-----BEGIN PUBLIC KEY-----";
const string footer = "-----END PUBLIC KEY-----";
pem = pem.Trim();
byte[] binaryKey;
if (!pem.StartsWith(header) || !pem.EndsWith(footer))
return null;
StringBuilder builder = new StringBuilder(pem);
builder.Replace(header, "");
builder.Replace(footer, "");
string formattedPem = builder.ToString().Trim();
try
{
binaryKey = Convert.FromBase64String(formattedPem);
}
catch (FormatException)
{
return null;
}
return binaryKey;
}
private static byte[] TrimByteArray(byte[] array)
{
List<byte> trimmedArray = new List<byte>();
bool startCopying = false;
foreach (var item in array)
{
if (!startCopying)
{
if (item == 0x20) continue;
else startCopying = true;
}
trimmedArray.Add(item);
}
array = trimmedArray.ToArray();
trimmedArray = new List<byte>();
for (int i = array.Length - 1; i >= 0; i--)
{
if (!startCopying)
{
if (array[i] == 0x20) continue;
else startCopying = true;
}
trimmedArray.Add(array[i]);
}
return trimmedArray.ToArray().Reverse().ToArray();
}
private static bool StartsWith(byte[] array, byte[] containedArray)
{
for (int i = 0; i < array.Length; i++)
{
if (i == containedArray.Length) break;
if (array[i] != containedArray[i]) return false;
}
return true;
}
private static bool EndsWith(byte[] array, byte[] containedArray)
{
for (int i = array.Length - 1, j = 0; i >= 0; i--, j++)
{
if (j == containedArray.Length) break;
if (array[i] != containedArray[containedArray.Length - j - 1]) return false;
}
return true;
}
}
}
#endif