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Use System.Security.Cryptography for TripleDesCipher (#1546)
* Use System.Security.Cryptography in DesCipher and TripleDesCipher; Fall back to use BouncyCastle if BCL doesn't support * Drop DesCipher; Replace PKCS7Padding with BouncyCastle's implementation. * Restore `CbcCipherMode` * Restore AesCipherMode; Use BlockImpl instead of BouncyCastleImpl for 3DES-CFB on lower targets. * Restore the xml doc comment
1 parent 29997ae commit 14c652c

26 files changed

+751
-988
lines changed

‎README.md‎

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@@ -121,7 +121,6 @@ The main types provided by this library are:
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Private keys in OpenSSL traditional PEM format can be encrypted using one of the following cipher methods:
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* DES-EDE3-CBC
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* DES-EDE3-CFB
124-
* DES-CBC
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* AES-128-CBC
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* AES-192-CBC
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* AES-256-CBC

‎src/Renci.SshNet/ConnectionInfo.cs‎

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@@ -12,7 +12,8 @@
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using Renci.SshNet.Security;
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using Renci.SshNet.Security.Cryptography;
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using Renci.SshNet.Security.Cryptography.Ciphers;
15-
using Renci.SshNet.Security.Cryptography.Ciphers.Modes;
15+
16+
using CipherMode = System.Security.Cryptography.CipherMode;
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namespace Renci.SshNet
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{
@@ -372,7 +373,7 @@ public ConnectionInfo(string host, int port, string username, ProxyTypes proxyTy
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{ "aes128-cbc", new CipherInfo(128, (key, iv) => new AesCipher(key, iv, AesCipherMode.CBC, pkcs7Padding: false)) },
373374
{ "aes192-cbc", new CipherInfo(192, (key, iv) => new AesCipher(key, iv, AesCipherMode.CBC, pkcs7Padding: false)) },
374375
{ "aes256-cbc", new CipherInfo(256, (key, iv) => new AesCipher(key, iv, AesCipherMode.CBC, pkcs7Padding: false)) },
375-
{ "3des-cbc", new CipherInfo(192, (key, iv) => new TripleDesCipher(key, new CbcCipherMode(iv), padding: null)) },
376+
{ "3des-cbc", new CipherInfo(192, (key, iv) => new TripleDesCipher(key, iv, CipherMode.CBC, pkcs7Padding: false)) },
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};
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378379
HmacAlgorithms = new Dictionary<string, HashInfo>

‎src/Renci.SshNet/PrivateKeyFile.OpenSSH.cs‎

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@@ -8,7 +8,8 @@
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using Renci.SshNet.Security;
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using Renci.SshNet.Security.Cryptography;
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using Renci.SshNet.Security.Cryptography.Ciphers;
11-
using Renci.SshNet.Security.Cryptography.Ciphers.Modes;
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using CipherMode = System.Security.Cryptography.CipherMode;
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namespace Renci.SshNet
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{
@@ -91,7 +92,7 @@ public Key Parse()
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{
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case "3des-cbc":
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ivLength = 8;
94-
cipherInfo = new CipherInfo(192, (key, iv) => new TripleDesCipher(key, new CbcCipherMode(iv), padding: null));
95+
cipherInfo = new CipherInfo(192, (key, iv) => new TripleDesCipher(key, iv, CipherMode.CBC, pkcs7Padding: false));
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break;
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case "aes128-cbc":
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cipherInfo = new CipherInfo(128, (key, iv) => new AesCipher(key, iv, AesCipherMode.CBC, pkcs7Padding: false));

‎src/Renci.SshNet/PrivateKeyFile.PKCS1.cs‎

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Original file line numberDiff line numberDiff line change
@@ -9,8 +9,8 @@
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using Renci.SshNet.Common;
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using Renci.SshNet.Security;
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using Renci.SshNet.Security.Cryptography.Ciphers;
12-
using Renci.SshNet.Security.Cryptography.Ciphers.Modes;
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using Renci.SshNet.Security.Cryptography.Ciphers.Paddings;
12+
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using CipherMode = System.Security.Cryptography.CipherMode;
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namespace Renci.SshNet
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{
@@ -51,13 +51,10 @@ public Key Parse()
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switch (_cipherName)
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{
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case "DES-EDE3-CBC":
54-
cipher = new CipherInfo(192, (key, iv) => new TripleDesCipher(key, new CbcCipherMode(iv), new PKCS7Padding()));
54+
cipher = new CipherInfo(192, (key, iv) => new TripleDesCipher(key, iv, CipherMode.CBC, pkcs7Padding: true));
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break;
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case "DES-EDE3-CFB":
57-
cipher = new CipherInfo(192, (key, iv) => new TripleDesCipher(key, new CfbCipherMode(iv), padding: null));
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break;
59-
case "DES-CBC":
60-
cipher = new CipherInfo(64, (key, iv) => new DesCipher(key, new CbcCipherMode(iv), new PKCS7Padding()));
57+
cipher = new CipherInfo(192, (key, iv) => new TripleDesCipher(key, iv, CipherMode.CFB, pkcs7Padding: false));
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break;
6259
case "AES-128-CBC":
6360
cipher = new CipherInfo(128, (key, iv) => new AesCipher(key, iv, AesCipherMode.CBC, pkcs7Padding: true));

‎src/Renci.SshNet/PrivateKeyFile.SSHCOM.cs‎

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@@ -7,7 +7,8 @@
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using Renci.SshNet.Common;
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using Renci.SshNet.Security;
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using Renci.SshNet.Security.Cryptography.Ciphers;
10-
using Renci.SshNet.Security.Cryptography.Ciphers.Modes;
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using CipherMode = System.Security.Cryptography.CipherMode;
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namespace Renci.SshNet
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{
@@ -51,7 +52,7 @@ public Key Parse()
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}
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var key = GetCipherKey(_passPhrase, 192 / 8);
54-
var ssh2Сipher = new TripleDesCipher(key, new CbcCipherMode(new byte[8]), padding: null);
55+
var ssh2Сipher = new TripleDesCipher(key, new byte[8], CipherMode.CBC, pkcs7Padding: false);
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keyData = ssh2Сipher.Decrypt(reader.ReadBytes(blobSize));
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}
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else

‎src/Renci.SshNet/PrivateKeyFile.cs‎

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@@ -48,9 +48,6 @@ namespace Renci.SshNet
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/// <description>DES-EDE3-CFB</description>
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/// </item>
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/// <item>
51-
/// <description>DES-CBC</description>
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/// </item>
53-
/// <item>
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/// <description>AES-128-CBC</description>
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/// </item>
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/// <item>

‎src/Renci.SshNet/Security/Cryptography/BlockCipher.cs‎

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@@ -1,5 +1,7 @@
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using System;
22

3+
using Org.BouncyCastle.Crypto.Paddings;
4+
35
using Renci.SshNet.Common;
46
using Renci.SshNet.Security.Cryptography.Ciphers;
57
using Renci.SshNet.Security.Cryptography.Ciphers.Modes;
@@ -13,7 +15,7 @@ public abstract class BlockCipher : SymmetricCipher
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{
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private readonly CipherMode _mode;
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16-
private readonly CipherPadding _padding;
18+
private readonly IBlockCipherPadding _padding;
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/// <summary>
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/// Gets the size of the block in bytes.
@@ -56,7 +58,7 @@ public byte BlockSize
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/// <param name="mode">Cipher mode.</param>
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/// <param name="padding">Cipher padding.</param>
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/// <exception cref="ArgumentNullException"><paramref name="key"/> is <see langword="null"/>.</exception>
59-
protected BlockCipher(byte[] key, byte blockSize, CipherMode mode, CipherPadding padding)
61+
protected BlockCipher(byte[] key, byte blockSize, CipherMode mode, IBlockCipherPadding padding)
6062
: base(key)
6163
{
6264
_blockSize = blockSize;
@@ -81,7 +83,9 @@ public override byte[] Encrypt(byte[] input, int offset, int length)
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if (_padding is not null)
8284
{
8385
paddingLength = _blockSize - (length % _blockSize);
84-
input = _padding.Pad(input, offset, length, paddingLength);
86+
input = input.Take(offset, length);
87+
Array.Resize(ref input, length + paddingLength);
88+
_ = _padding.AddPadding(input, length);
8589
length += paddingLength;
8690
offset = 0;
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}

‎src/Renci.SshNet/Security/Cryptography/Ciphers/AesCipher.BclImpl.cs‎

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@@ -52,6 +52,8 @@ public override byte[] Encrypt(byte[] input, int offset, int length)
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{
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if (_aes.Mode is System.Security.Cryptography.CipherMode.CFB or System.Security.Cryptography.CipherMode.OFB)
5454
{
55+
// Manually pad the input for cfb and ofb cipher mode as BCL doesn't support partial block.
56+
// See https://github.com/dotnet/runtime/blob/e7d837da5b1aacd9325a8b8f2214cfaf4d3f0ff6/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/SymmetricPadding.cs#L20-L21
5557
paddingLength = BlockSize - (length % BlockSize);
5658
input = input.Take(offset, length);
5759
length += paddingLength;
@@ -69,6 +71,7 @@ public override byte[] Encrypt(byte[] input, int offset, int length)
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7072
if (paddingLength > 0)
7173
{
74+
// Manually unpad the output.
7275
Array.Resize(ref output, output.Length - paddingLength);
7376
}
7477

@@ -89,11 +92,12 @@ public override byte[] Decrypt(byte[] input, int offset, int length)
8992
{
9093
if (_aes.Mode is System.Security.Cryptography.CipherMode.CFB or System.Security.Cryptography.CipherMode.OFB)
9194
{
95+
// Manually pad the input for cfb and ofb cipher mode as BCL doesn't support partial block.
96+
// See https://github.com/dotnet/runtime/blob/e7d837da5b1aacd9325a8b8f2214cfaf4d3f0ff6/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/SymmetricPadding.cs#L20-L21
9297
paddingLength = BlockSize - (length % BlockSize);
93-
var newInput = new byte[input.Length + paddingLength];
94-
Buffer.BlockCopy(input, offset, newInput, 0, length);
95-
input = newInput;
96-
length = input.Length;
98+
input = input.Take(offset, length);
99+
length += paddingLength;
100+
Array.Resize(ref input, length);
97101
offset = 0;
98102
}
99103
}
@@ -107,6 +111,7 @@ public override byte[] Decrypt(byte[] input, int offset, int length)
107111

108112
if (paddingLength > 0)
109113
{
114+
// Manually unpad the output.
110115
Array.Resize(ref output, output.Length - paddingLength);
111116
}
112117

@@ -123,21 +128,11 @@ public override int DecryptBlock(byte[] inputBuffer, int inputOffset, int inputC
123128
throw new NotImplementedException($"Invalid usage of {nameof(DecryptBlock)}.");
124129
}
125130

126-
private void Dispose(bool disposing)
127-
{
128-
if (disposing)
129-
{
130-
_aes.Dispose();
131-
_encryptor.Dispose();
132-
_decryptor.Dispose();
133-
}
134-
}
135-
136131
public void Dispose()
137132
{
138-
// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
139-
Dispose(disposing: true);
140-
GC.SuppressFinalize(this);
133+
_aes.Dispose();
134+
_encryptor.Dispose();
135+
_decryptor.Dispose();
141136
}
142137
}
143138
}

‎src/Renci.SshNet/Security/Cryptography/Ciphers/AesCipher.BlockImpl.cs‎

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@@ -1,6 +1,8 @@
11
using System;
22
using System.Security.Cryptography;
33

4+
using Org.BouncyCastle.Crypto.Paddings;
5+
46
namespace Renci.SshNet.Security.Cryptography.Ciphers
57
{
68
public partial class AesCipher
@@ -11,7 +13,7 @@ private sealed class BlockImpl : BlockCipher, IDisposable
1113
private readonly ICryptoTransform _encryptor;
1214
private readonly ICryptoTransform _decryptor;
1315

14-
public BlockImpl(byte[] key, CipherMode mode, CipherPadding padding)
16+
public BlockImpl(byte[] key, CipherMode mode, IBlockCipherPadding padding)
1517
: base(key, 16, mode, padding)
1618
{
1719
var aes = Aes.Create();
@@ -33,21 +35,11 @@ public override int DecryptBlock(byte[] inputBuffer, int inputOffset, int inputC
3335
return _decryptor.TransformBlock(inputBuffer, inputOffset, inputCount, outputBuffer, outputOffset);
3436
}
3537

36-
private void Dispose(bool disposing)
37-
{
38-
if (disposing)
39-
{
40-
_aes.Dispose();
41-
_encryptor.Dispose();
42-
_decryptor.Dispose();
43-
}
44-
}
45-
4638
public void Dispose()
4739
{
48-
// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
49-
Dispose(disposing: true);
50-
GC.SuppressFinalize(this);
40+
_aes.Dispose();
41+
_encryptor.Dispose();
42+
_decryptor.Dispose();
5143
}
5244
}
5345
}

‎src/Renci.SshNet/Security/Cryptography/Ciphers/AesCipher.CtrImpl.cs‎

Lines changed: 2 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -105,20 +105,10 @@ private static void ArrayXOR(byte[] buffer, byte[] data, int offset, int length)
105105
}
106106
}
107107

108-
private void Dispose(bool disposing)
109-
{
110-
if (disposing)
111-
{
112-
_aes.Dispose();
113-
_encryptor.Dispose();
114-
}
115-
}
116-
117108
public void Dispose()
118109
{
119-
// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
120-
Dispose(disposing: true);
121-
GC.SuppressFinalize(this);
110+
_aes.Dispose();
111+
_encryptor.Dispose();
122112
}
123113
}
124114
}

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