mirror of
https://github.com/jellyfin/jellyfin.git
synced 2024-09-07 11:57:55 +02:00
745 lines
21 KiB
C#
745 lines
21 KiB
C#
//
|
|
// CryptoConvert.cs - Crypto Convertion Routines
|
|
//
|
|
// Author:
|
|
// Sebastien Pouliot <sebastien@ximian.com>
|
|
//
|
|
// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
|
|
// Copyright (C) 2004-2006 Novell Inc. (http://www.novell.com)
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining
|
|
// a copy of this software and associated documentation files (the
|
|
// "Software"), to deal in the Software without restriction, including
|
|
// without limitation the rights to use, copy, modify, merge, publish,
|
|
// distribute, sublicense, and/or sell copies of the Software, and to
|
|
// permit persons to whom the Software is furnished to do so, subject to
|
|
// the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be
|
|
// included in all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
//
|
|
|
|
using System;
|
|
using System.Globalization;
|
|
using System.Security.Cryptography;
|
|
using System.Text;
|
|
|
|
namespace Emby.Server.Core.Cryptography
|
|
{
|
|
|
|
public sealed class CryptoConvert {
|
|
|
|
private CryptoConvert ()
|
|
{
|
|
}
|
|
|
|
static private int ToInt32LE (byte [] bytes, int offset)
|
|
{
|
|
return (bytes [offset+3] << 24) | (bytes [offset+2] << 16) | (bytes [offset+1] << 8) | bytes [offset];
|
|
}
|
|
|
|
static private uint ToUInt32LE (byte [] bytes, int offset)
|
|
{
|
|
return (uint)((bytes [offset+3] << 24) | (bytes [offset+2] << 16) | (bytes [offset+1] << 8) | bytes [offset]);
|
|
}
|
|
|
|
static private byte [] GetBytesLE (int val)
|
|
{
|
|
return new byte [] {
|
|
(byte) (val & 0xff),
|
|
(byte) ((val >> 8) & 0xff),
|
|
(byte) ((val >> 16) & 0xff),
|
|
(byte) ((val >> 24) & 0xff)
|
|
};
|
|
}
|
|
|
|
static private byte[] Trim (byte[] array)
|
|
{
|
|
for (int i=0; i < array.Length; i++) {
|
|
if (array [i] != 0x00) {
|
|
byte[] result = new byte [array.Length - i];
|
|
Buffer.BlockCopy (array, i, result, 0, result.Length);
|
|
return result;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
// convert the key from PRIVATEKEYBLOB to RSA
|
|
// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/Security/private_key_blobs.asp
|
|
// e.g. SNK files, PVK files
|
|
static public RSA FromCapiPrivateKeyBlob (byte[] blob)
|
|
{
|
|
return FromCapiPrivateKeyBlob (blob, 0);
|
|
}
|
|
|
|
static public RSA FromCapiPrivateKeyBlob (byte[] blob, int offset)
|
|
{
|
|
if (blob == null)
|
|
throw new ArgumentNullException ("blob");
|
|
if (offset >= blob.Length)
|
|
throw new ArgumentException ("blob is too small.");
|
|
|
|
RSAParameters rsap = new RSAParameters ();
|
|
try {
|
|
if ((blob [offset] != 0x07) || // PRIVATEKEYBLOB (0x07)
|
|
(blob [offset+1] != 0x02) || // Version (0x02)
|
|
(blob [offset+2] != 0x00) || // Reserved (word)
|
|
(blob [offset+3] != 0x00) ||
|
|
(ToUInt32LE (blob, offset+8) != 0x32415352)) // DWORD magic = RSA2
|
|
throw new CryptographicException ("Invalid blob header");
|
|
|
|
// ALGID (CALG_RSA_SIGN, CALG_RSA_KEYX, ...)
|
|
// int algId = ToInt32LE (blob, offset+4);
|
|
|
|
// DWORD bitlen
|
|
int bitLen = ToInt32LE (blob, offset+12);
|
|
|
|
// DWORD public exponent
|
|
byte[] exp = new byte [4];
|
|
Buffer.BlockCopy (blob, offset+16, exp, 0, 4);
|
|
Array.Reverse (exp);
|
|
rsap.Exponent = Trim (exp);
|
|
|
|
int pos = offset+20;
|
|
// BYTE modulus[rsapubkey.bitlen/8];
|
|
int byteLen = (bitLen >> 3);
|
|
rsap.Modulus = new byte [byteLen];
|
|
Buffer.BlockCopy (blob, pos, rsap.Modulus, 0, byteLen);
|
|
Array.Reverse (rsap.Modulus);
|
|
pos += byteLen;
|
|
|
|
// BYTE prime1[rsapubkey.bitlen/16];
|
|
int byteHalfLen = (byteLen >> 1);
|
|
rsap.P = new byte [byteHalfLen];
|
|
Buffer.BlockCopy (blob, pos, rsap.P, 0, byteHalfLen);
|
|
Array.Reverse (rsap.P);
|
|
pos += byteHalfLen;
|
|
|
|
// BYTE prime2[rsapubkey.bitlen/16];
|
|
rsap.Q = new byte [byteHalfLen];
|
|
Buffer.BlockCopy (blob, pos, rsap.Q, 0, byteHalfLen);
|
|
Array.Reverse (rsap.Q);
|
|
pos += byteHalfLen;
|
|
|
|
// BYTE exponent1[rsapubkey.bitlen/16];
|
|
rsap.DP = new byte [byteHalfLen];
|
|
Buffer.BlockCopy (blob, pos, rsap.DP, 0, byteHalfLen);
|
|
Array.Reverse (rsap.DP);
|
|
pos += byteHalfLen;
|
|
|
|
// BYTE exponent2[rsapubkey.bitlen/16];
|
|
rsap.DQ = new byte [byteHalfLen];
|
|
Buffer.BlockCopy (blob, pos, rsap.DQ, 0, byteHalfLen);
|
|
Array.Reverse (rsap.DQ);
|
|
pos += byteHalfLen;
|
|
|
|
// BYTE coefficient[rsapubkey.bitlen/16];
|
|
rsap.InverseQ = new byte [byteHalfLen];
|
|
Buffer.BlockCopy (blob, pos, rsap.InverseQ, 0, byteHalfLen);
|
|
Array.Reverse (rsap.InverseQ);
|
|
pos += byteHalfLen;
|
|
|
|
// ok, this is hackish but CryptoAPI support it so...
|
|
// note: only works because CRT is used by default
|
|
// http://bugzilla.ximian.com/show_bug.cgi?id=57941
|
|
rsap.D = new byte [byteLen]; // must be allocated
|
|
if (pos + byteLen + offset <= blob.Length) {
|
|
// BYTE privateExponent[rsapubkey.bitlen/8];
|
|
Buffer.BlockCopy (blob, pos, rsap.D, 0, byteLen);
|
|
Array.Reverse (rsap.D);
|
|
}
|
|
}
|
|
catch (Exception e) {
|
|
throw new CryptographicException ("Invalid blob.", e);
|
|
}
|
|
|
|
RSA rsa = null;
|
|
try
|
|
{
|
|
rsa = RSA.Create();
|
|
rsa.ImportParameters(rsap);
|
|
}
|
|
catch (CryptographicException ce)
|
|
{
|
|
// this may cause problem when this code is run under
|
|
// the SYSTEM identity on Windows (e.g. ASP.NET). See
|
|
// http://bugzilla.ximian.com/show_bug.cgi?id=77559
|
|
try
|
|
{
|
|
CspParameters csp = new CspParameters();
|
|
csp.Flags = CspProviderFlags.UseMachineKeyStore;
|
|
rsa = new RSACryptoServiceProvider(csp);
|
|
rsa.ImportParameters(rsap);
|
|
}
|
|
catch
|
|
{
|
|
// rethrow original, not the later, exception if this fails
|
|
throw ce;
|
|
}
|
|
}
|
|
return rsa;
|
|
}
|
|
|
|
static public DSA FromCapiPrivateKeyBlobDSA (byte[] blob)
|
|
{
|
|
return FromCapiPrivateKeyBlobDSA (blob, 0);
|
|
}
|
|
|
|
static public DSA FromCapiPrivateKeyBlobDSA (byte[] blob, int offset)
|
|
{
|
|
if (blob == null)
|
|
throw new ArgumentNullException ("blob");
|
|
if (offset >= blob.Length)
|
|
throw new ArgumentException ("blob is too small.");
|
|
|
|
DSAParameters dsap = new DSAParameters ();
|
|
try {
|
|
if ((blob [offset] != 0x07) || // PRIVATEKEYBLOB (0x07)
|
|
(blob [offset + 1] != 0x02) || // Version (0x02)
|
|
(blob [offset + 2] != 0x00) || // Reserved (word)
|
|
(blob [offset + 3] != 0x00) ||
|
|
(ToUInt32LE (blob, offset + 8) != 0x32535344)) // DWORD magic
|
|
throw new CryptographicException ("Invalid blob header");
|
|
|
|
int bitlen = ToInt32LE (blob, offset + 12);
|
|
int bytelen = bitlen >> 3;
|
|
int pos = offset + 16;
|
|
|
|
dsap.P = new byte [bytelen];
|
|
Buffer.BlockCopy (blob, pos, dsap.P, 0, bytelen);
|
|
Array.Reverse (dsap.P);
|
|
pos += bytelen;
|
|
|
|
dsap.Q = new byte [20];
|
|
Buffer.BlockCopy (blob, pos, dsap.Q, 0, 20);
|
|
Array.Reverse (dsap.Q);
|
|
pos += 20;
|
|
|
|
dsap.G = new byte [bytelen];
|
|
Buffer.BlockCopy (blob, pos, dsap.G, 0, bytelen);
|
|
Array.Reverse (dsap.G);
|
|
pos += bytelen;
|
|
|
|
dsap.X = new byte [20];
|
|
Buffer.BlockCopy (blob, pos, dsap.X, 0, 20);
|
|
Array.Reverse (dsap.X);
|
|
pos += 20;
|
|
|
|
dsap.Counter = ToInt32LE (blob, pos);
|
|
pos += 4;
|
|
|
|
dsap.Seed = new byte [20];
|
|
Buffer.BlockCopy (blob, pos, dsap.Seed, 0, 20);
|
|
Array.Reverse (dsap.Seed);
|
|
pos += 20;
|
|
}
|
|
catch (Exception e) {
|
|
throw new CryptographicException ("Invalid blob.", e);
|
|
}
|
|
|
|
DSA dsa = null;
|
|
try
|
|
{
|
|
dsa = (DSA)DSA.Create();
|
|
dsa.ImportParameters(dsap);
|
|
}
|
|
catch (CryptographicException ce)
|
|
{
|
|
// this may cause problem when this code is run under
|
|
// the SYSTEM identity on Windows (e.g. ASP.NET). See
|
|
// http://bugzilla.ximian.com/show_bug.cgi?id=77559
|
|
try
|
|
{
|
|
CspParameters csp = new CspParameters();
|
|
csp.Flags = CspProviderFlags.UseMachineKeyStore;
|
|
dsa = new DSACryptoServiceProvider(csp);
|
|
dsa.ImportParameters(dsap);
|
|
}
|
|
catch
|
|
{
|
|
// rethrow original, not the later, exception if this fails
|
|
throw ce;
|
|
}
|
|
}
|
|
return dsa;
|
|
}
|
|
|
|
static public byte[] ToCapiPrivateKeyBlob (RSA rsa)
|
|
{
|
|
RSAParameters p = rsa.ExportParameters (true);
|
|
int keyLength = p.Modulus.Length; // in bytes
|
|
byte[] blob = new byte [20 + (keyLength << 2) + (keyLength >> 1)];
|
|
|
|
blob [0] = 0x07; // Type - PRIVATEKEYBLOB (0x07)
|
|
blob [1] = 0x02; // Version - Always CUR_BLOB_VERSION (0x02)
|
|
// [2], [3] // RESERVED - Always 0
|
|
blob [5] = 0x24; // ALGID - Always 00 24 00 00 (for CALG_RSA_SIGN)
|
|
blob [8] = 0x52; // Magic - RSA2 (ASCII in hex)
|
|
blob [9] = 0x53;
|
|
blob [10] = 0x41;
|
|
blob [11] = 0x32;
|
|
|
|
byte[] bitlen = GetBytesLE (keyLength << 3);
|
|
blob [12] = bitlen [0]; // bitlen
|
|
blob [13] = bitlen [1];
|
|
blob [14] = bitlen [2];
|
|
blob [15] = bitlen [3];
|
|
|
|
// public exponent (DWORD)
|
|
int pos = 16;
|
|
int n = p.Exponent.Length;
|
|
while (n > 0)
|
|
blob [pos++] = p.Exponent [--n];
|
|
// modulus
|
|
pos = 20;
|
|
byte[] part = p.Modulus;
|
|
int len = part.Length;
|
|
Array.Reverse (part, 0, len);
|
|
Buffer.BlockCopy (part, 0, blob, pos, len);
|
|
pos += len;
|
|
// private key
|
|
part = p.P;
|
|
len = part.Length;
|
|
Array.Reverse (part, 0, len);
|
|
Buffer.BlockCopy (part, 0, blob, pos, len);
|
|
pos += len;
|
|
|
|
part = p.Q;
|
|
len = part.Length;
|
|
Array.Reverse (part, 0, len);
|
|
Buffer.BlockCopy (part, 0, blob, pos, len);
|
|
pos += len;
|
|
|
|
part = p.DP;
|
|
len = part.Length;
|
|
Array.Reverse (part, 0, len);
|
|
Buffer.BlockCopy (part, 0, blob, pos, len);
|
|
pos += len;
|
|
|
|
part = p.DQ;
|
|
len = part.Length;
|
|
Array.Reverse (part, 0, len);
|
|
Buffer.BlockCopy (part, 0, blob, pos, len);
|
|
pos += len;
|
|
|
|
part = p.InverseQ;
|
|
len = part.Length;
|
|
Array.Reverse (part, 0, len);
|
|
Buffer.BlockCopy (part, 0, blob, pos, len);
|
|
pos += len;
|
|
|
|
part = p.D;
|
|
len = part.Length;
|
|
Array.Reverse (part, 0, len);
|
|
Buffer.BlockCopy (part, 0, blob, pos, len);
|
|
|
|
return blob;
|
|
}
|
|
|
|
static public byte[] ToCapiPrivateKeyBlob (DSA dsa)
|
|
{
|
|
DSAParameters p = dsa.ExportParameters (true);
|
|
int keyLength = p.P.Length; // in bytes
|
|
|
|
// header + P + Q + G + X + count + seed
|
|
byte[] blob = new byte [16 + keyLength + 20 + keyLength + 20 + 4 + 20];
|
|
|
|
blob [0] = 0x07; // Type - PRIVATEKEYBLOB (0x07)
|
|
blob [1] = 0x02; // Version - Always CUR_BLOB_VERSION (0x02)
|
|
// [2], [3] // RESERVED - Always 0
|
|
blob [5] = 0x22; // ALGID
|
|
blob [8] = 0x44; // Magic
|
|
blob [9] = 0x53;
|
|
blob [10] = 0x53;
|
|
blob [11] = 0x32;
|
|
|
|
byte[] bitlen = GetBytesLE (keyLength << 3);
|
|
blob [12] = bitlen [0];
|
|
blob [13] = bitlen [1];
|
|
blob [14] = bitlen [2];
|
|
blob [15] = bitlen [3];
|
|
|
|
int pos = 16;
|
|
byte[] part = p.P;
|
|
Array.Reverse (part);
|
|
Buffer.BlockCopy (part, 0, blob, pos, keyLength);
|
|
pos += keyLength;
|
|
|
|
part = p.Q;
|
|
Array.Reverse (part);
|
|
Buffer.BlockCopy (part, 0, blob, pos, 20);
|
|
pos += 20;
|
|
|
|
part = p.G;
|
|
Array.Reverse (part);
|
|
Buffer.BlockCopy (part, 0, blob, pos, keyLength);
|
|
pos += keyLength;
|
|
|
|
part = p.X;
|
|
Array.Reverse (part);
|
|
Buffer.BlockCopy (part, 0, blob, pos, 20);
|
|
pos += 20;
|
|
|
|
Buffer.BlockCopy (GetBytesLE (p.Counter), 0, blob, pos, 4);
|
|
pos += 4;
|
|
|
|
part = p.Seed;
|
|
Array.Reverse (part);
|
|
Buffer.BlockCopy (part, 0, blob, pos, 20);
|
|
|
|
return blob;
|
|
}
|
|
|
|
static public RSA FromCapiPublicKeyBlob (byte[] blob)
|
|
{
|
|
return FromCapiPublicKeyBlob (blob, 0);
|
|
}
|
|
|
|
static public RSA FromCapiPublicKeyBlob (byte[] blob, int offset)
|
|
{
|
|
if (blob == null)
|
|
throw new ArgumentNullException ("blob");
|
|
if (offset >= blob.Length)
|
|
throw new ArgumentException ("blob is too small.");
|
|
|
|
try {
|
|
if ((blob [offset] != 0x06) || // PUBLICKEYBLOB (0x06)
|
|
(blob [offset+1] != 0x02) || // Version (0x02)
|
|
(blob [offset+2] != 0x00) || // Reserved (word)
|
|
(blob [offset+3] != 0x00) ||
|
|
(ToUInt32LE (blob, offset+8) != 0x31415352)) // DWORD magic = RSA1
|
|
throw new CryptographicException ("Invalid blob header");
|
|
|
|
// ALGID (CALG_RSA_SIGN, CALG_RSA_KEYX, ...)
|
|
// int algId = ToInt32LE (blob, offset+4);
|
|
|
|
// DWORD bitlen
|
|
int bitLen = ToInt32LE (blob, offset+12);
|
|
|
|
// DWORD public exponent
|
|
RSAParameters rsap = new RSAParameters ();
|
|
rsap.Exponent = new byte [3];
|
|
rsap.Exponent [0] = blob [offset+18];
|
|
rsap.Exponent [1] = blob [offset+17];
|
|
rsap.Exponent [2] = blob [offset+16];
|
|
|
|
int pos = offset+20;
|
|
// BYTE modulus[rsapubkey.bitlen/8];
|
|
int byteLen = (bitLen >> 3);
|
|
rsap.Modulus = new byte [byteLen];
|
|
Buffer.BlockCopy (blob, pos, rsap.Modulus, 0, byteLen);
|
|
Array.Reverse (rsap.Modulus);
|
|
RSA rsa = null;
|
|
try
|
|
{
|
|
rsa = RSA.Create();
|
|
rsa.ImportParameters(rsap);
|
|
}
|
|
catch (CryptographicException)
|
|
{
|
|
// this may cause problem when this code is run under
|
|
// the SYSTEM identity on Windows (e.g. ASP.NET). See
|
|
// http://bugzilla.ximian.com/show_bug.cgi?id=77559
|
|
CspParameters csp = new CspParameters();
|
|
csp.Flags = CspProviderFlags.UseMachineKeyStore;
|
|
rsa = new RSACryptoServiceProvider(csp);
|
|
rsa.ImportParameters(rsap);
|
|
}
|
|
return rsa;
|
|
}
|
|
catch (Exception e) {
|
|
throw new CryptographicException ("Invalid blob.", e);
|
|
}
|
|
}
|
|
|
|
static public DSA FromCapiPublicKeyBlobDSA (byte[] blob)
|
|
{
|
|
return FromCapiPublicKeyBlobDSA (blob, 0);
|
|
}
|
|
|
|
static public DSA FromCapiPublicKeyBlobDSA (byte[] blob, int offset)
|
|
{
|
|
if (blob == null)
|
|
throw new ArgumentNullException ("blob");
|
|
if (offset >= blob.Length)
|
|
throw new ArgumentException ("blob is too small.");
|
|
|
|
try {
|
|
if ((blob [offset] != 0x06) || // PUBLICKEYBLOB (0x06)
|
|
(blob [offset + 1] != 0x02) || // Version (0x02)
|
|
(blob [offset + 2] != 0x00) || // Reserved (word)
|
|
(blob [offset + 3] != 0x00) ||
|
|
(ToUInt32LE (blob, offset + 8) != 0x31535344)) // DWORD magic
|
|
throw new CryptographicException ("Invalid blob header");
|
|
|
|
int bitlen = ToInt32LE (blob, offset + 12);
|
|
DSAParameters dsap = new DSAParameters ();
|
|
int bytelen = bitlen >> 3;
|
|
int pos = offset + 16;
|
|
|
|
dsap.P = new byte [bytelen];
|
|
Buffer.BlockCopy (blob, pos, dsap.P, 0, bytelen);
|
|
Array.Reverse (dsap.P);
|
|
pos += bytelen;
|
|
|
|
dsap.Q = new byte [20];
|
|
Buffer.BlockCopy (blob, pos, dsap.Q, 0, 20);
|
|
Array.Reverse (dsap.Q);
|
|
pos += 20;
|
|
|
|
dsap.G = new byte [bytelen];
|
|
Buffer.BlockCopy (blob, pos, dsap.G, 0, bytelen);
|
|
Array.Reverse (dsap.G);
|
|
pos += bytelen;
|
|
|
|
dsap.Y = new byte [bytelen];
|
|
Buffer.BlockCopy (blob, pos, dsap.Y, 0, bytelen);
|
|
Array.Reverse (dsap.Y);
|
|
pos += bytelen;
|
|
|
|
dsap.Counter = ToInt32LE (blob, pos);
|
|
pos += 4;
|
|
|
|
dsap.Seed = new byte [20];
|
|
Buffer.BlockCopy (blob, pos, dsap.Seed, 0, 20);
|
|
Array.Reverse (dsap.Seed);
|
|
pos += 20;
|
|
|
|
DSA dsa = (DSA)DSA.Create ();
|
|
dsa.ImportParameters (dsap);
|
|
return dsa;
|
|
}
|
|
catch (Exception e) {
|
|
throw new CryptographicException ("Invalid blob.", e);
|
|
}
|
|
}
|
|
|
|
static public byte[] ToCapiPublicKeyBlob (RSA rsa)
|
|
{
|
|
RSAParameters p = rsa.ExportParameters (false);
|
|
int keyLength = p.Modulus.Length; // in bytes
|
|
byte[] blob = new byte [20 + keyLength];
|
|
|
|
blob [0] = 0x06; // Type - PUBLICKEYBLOB (0x06)
|
|
blob [1] = 0x02; // Version - Always CUR_BLOB_VERSION (0x02)
|
|
// [2], [3] // RESERVED - Always 0
|
|
blob [5] = 0x24; // ALGID - Always 00 24 00 00 (for CALG_RSA_SIGN)
|
|
blob [8] = 0x52; // Magic - RSA1 (ASCII in hex)
|
|
blob [9] = 0x53;
|
|
blob [10] = 0x41;
|
|
blob [11] = 0x31;
|
|
|
|
byte[] bitlen = GetBytesLE (keyLength << 3);
|
|
blob [12] = bitlen [0]; // bitlen
|
|
blob [13] = bitlen [1];
|
|
blob [14] = bitlen [2];
|
|
blob [15] = bitlen [3];
|
|
|
|
// public exponent (DWORD)
|
|
int pos = 16;
|
|
int n = p.Exponent.Length;
|
|
while (n > 0)
|
|
blob [pos++] = p.Exponent [--n];
|
|
// modulus
|
|
pos = 20;
|
|
byte[] part = p.Modulus;
|
|
int len = part.Length;
|
|
Array.Reverse (part, 0, len);
|
|
Buffer.BlockCopy (part, 0, blob, pos, len);
|
|
pos += len;
|
|
return blob;
|
|
}
|
|
|
|
static public byte[] ToCapiPublicKeyBlob (DSA dsa)
|
|
{
|
|
DSAParameters p = dsa.ExportParameters (false);
|
|
int keyLength = p.P.Length; // in bytes
|
|
|
|
// header + P + Q + G + Y + count + seed
|
|
byte[] blob = new byte [16 + keyLength + 20 + keyLength + keyLength + 4 + 20];
|
|
|
|
blob [0] = 0x06; // Type - PUBLICKEYBLOB (0x06)
|
|
blob [1] = 0x02; // Version - Always CUR_BLOB_VERSION (0x02)
|
|
// [2], [3] // RESERVED - Always 0
|
|
blob [5] = 0x22; // ALGID
|
|
blob [8] = 0x44; // Magic
|
|
blob [9] = 0x53;
|
|
blob [10] = 0x53;
|
|
blob [11] = 0x31;
|
|
|
|
byte[] bitlen = GetBytesLE (keyLength << 3);
|
|
blob [12] = bitlen [0];
|
|
blob [13] = bitlen [1];
|
|
blob [14] = bitlen [2];
|
|
blob [15] = bitlen [3];
|
|
|
|
int pos = 16;
|
|
byte[] part;
|
|
|
|
part = p.P;
|
|
Array.Reverse (part);
|
|
Buffer.BlockCopy (part, 0, blob, pos, keyLength);
|
|
pos += keyLength;
|
|
|
|
part = p.Q;
|
|
Array.Reverse (part);
|
|
Buffer.BlockCopy (part, 0, blob, pos, 20);
|
|
pos += 20;
|
|
|
|
part = p.G;
|
|
Array.Reverse (part);
|
|
Buffer.BlockCopy (part, 0, blob, pos, keyLength);
|
|
pos += keyLength;
|
|
|
|
part = p.Y;
|
|
Array.Reverse (part);
|
|
Buffer.BlockCopy (part, 0, blob, pos, keyLength);
|
|
pos += keyLength;
|
|
|
|
Buffer.BlockCopy (GetBytesLE (p.Counter), 0, blob, pos, 4);
|
|
pos += 4;
|
|
|
|
part = p.Seed;
|
|
Array.Reverse (part);
|
|
Buffer.BlockCopy (part, 0, blob, pos, 20);
|
|
|
|
return blob;
|
|
}
|
|
|
|
// PRIVATEKEYBLOB
|
|
// PUBLICKEYBLOB
|
|
static public RSA FromCapiKeyBlob (byte[] blob)
|
|
{
|
|
return FromCapiKeyBlob (blob, 0);
|
|
}
|
|
|
|
static public RSA FromCapiKeyBlob (byte[] blob, int offset)
|
|
{
|
|
if (blob == null)
|
|
throw new ArgumentNullException ("blob");
|
|
if (offset >= blob.Length)
|
|
throw new ArgumentException ("blob is too small.");
|
|
|
|
switch (blob [offset]) {
|
|
case 0x00:
|
|
// this could be a public key inside an header
|
|
// like "sn -e" would produce
|
|
if (blob [offset + 12] == 0x06) {
|
|
return FromCapiPublicKeyBlob (blob, offset + 12);
|
|
}
|
|
break;
|
|
case 0x06:
|
|
return FromCapiPublicKeyBlob (blob, offset);
|
|
case 0x07:
|
|
return FromCapiPrivateKeyBlob (blob, offset);
|
|
}
|
|
throw new CryptographicException ("Unknown blob format.");
|
|
}
|
|
|
|
static public DSA FromCapiKeyBlobDSA (byte[] blob)
|
|
{
|
|
return FromCapiKeyBlobDSA (blob, 0);
|
|
}
|
|
|
|
static public DSA FromCapiKeyBlobDSA (byte[] blob, int offset)
|
|
{
|
|
if (blob == null)
|
|
throw new ArgumentNullException ("blob");
|
|
if (offset >= blob.Length)
|
|
throw new ArgumentException ("blob is too small.");
|
|
|
|
switch (blob [offset]) {
|
|
case 0x06:
|
|
return FromCapiPublicKeyBlobDSA (blob, offset);
|
|
case 0x07:
|
|
return FromCapiPrivateKeyBlobDSA (blob, offset);
|
|
}
|
|
throw new CryptographicException ("Unknown blob format.");
|
|
}
|
|
|
|
static public byte[] ToCapiKeyBlob (AsymmetricAlgorithm keypair, bool includePrivateKey)
|
|
{
|
|
if (keypair == null)
|
|
throw new ArgumentNullException ("keypair");
|
|
|
|
// check between RSA and DSA (and potentially others like DH)
|
|
if (keypair is RSA)
|
|
return ToCapiKeyBlob ((RSA)keypair, includePrivateKey);
|
|
else if (keypair is DSA)
|
|
return ToCapiKeyBlob ((DSA)keypair, includePrivateKey);
|
|
else
|
|
return null; // TODO
|
|
}
|
|
|
|
static public byte[] ToCapiKeyBlob (RSA rsa, bool includePrivateKey)
|
|
{
|
|
if (rsa == null)
|
|
throw new ArgumentNullException ("rsa");
|
|
|
|
if (includePrivateKey)
|
|
return ToCapiPrivateKeyBlob (rsa);
|
|
else
|
|
return ToCapiPublicKeyBlob (rsa);
|
|
}
|
|
|
|
static public byte[] ToCapiKeyBlob (DSA dsa, bool includePrivateKey)
|
|
{
|
|
if (dsa == null)
|
|
throw new ArgumentNullException ("dsa");
|
|
|
|
if (includePrivateKey)
|
|
return ToCapiPrivateKeyBlob (dsa);
|
|
else
|
|
return ToCapiPublicKeyBlob (dsa);
|
|
}
|
|
|
|
static public string ToHex (byte[] input)
|
|
{
|
|
if (input == null)
|
|
return null;
|
|
|
|
StringBuilder sb = new StringBuilder (input.Length * 2);
|
|
foreach (byte b in input) {
|
|
sb.Append (b.ToString ("X2", CultureInfo.InvariantCulture));
|
|
}
|
|
return sb.ToString ();
|
|
}
|
|
|
|
static private byte FromHexChar (char c)
|
|
{
|
|
if ((c >= 'a') && (c <= 'f'))
|
|
return (byte) (c - 'a' + 10);
|
|
if ((c >= 'A') && (c <= 'F'))
|
|
return (byte) (c - 'A' + 10);
|
|
if ((c >= '0') && (c <= '9'))
|
|
return (byte) (c - '0');
|
|
throw new ArgumentException ("invalid hex char");
|
|
}
|
|
|
|
static public byte[] FromHex (string hex)
|
|
{
|
|
if (hex == null)
|
|
return null;
|
|
if ((hex.Length & 0x1) == 0x1)
|
|
throw new ArgumentException ("Length must be a multiple of 2");
|
|
|
|
byte[] result = new byte [hex.Length >> 1];
|
|
int n = 0;
|
|
int i = 0;
|
|
while (n < result.Length) {
|
|
result [n] = (byte) (FromHexChar (hex [i++]) << 4);
|
|
result [n++] += FromHexChar (hex [i++]);
|
|
}
|
|
return result;
|
|
}
|
|
}
|
|
}
|