private static byte[] CreateSnPublicKeyBlob(BlobHeader header, RsaPubKey rsa, byte[] pubKeyData)
{
var snPubKey = new SnPublicKeyBlob()
{
SigAlgId = AlgorithmId.RsaSign,
HashAlgId = AlgorithmId.Sha,
PublicKeySize = (UInt32)(s_offsetToKeyData + pubKeyData.Length)
};
using (var ms = new MemoryStream(160))
using (var binaryWriter = new BinaryWriter(ms))
{
binaryWriter.Write(snPubKey.SigAlgId);
binaryWriter.Write(snPubKey.HashAlgId);
binaryWriter.Write(snPubKey.PublicKeySize);
binaryWriter.Write(header.Type);
binaryWriter.Write(header.Version);
binaryWriter.Write(header.Reserved);
binaryWriter.Write(header.AlgId);
binaryWriter.Write(rsa.Magic);
binaryWriter.Write(rsa.BitLen);
binaryWriter.Write(rsa.PubExp);
binaryWriter.Write(pubKeyData);
return(ms.ToArray());
}
}
public SolverParameters(RsaPubKey serverKey) : this()
{
if (serverKey == null)
{
throw new ArgumentNullException(nameof(serverKey));
}
ServerKey = serverKey;
}
public SolverClientSession(RsaPubKey serverKey)
{
if (serverKey == null)
{
throw new ArgumentNullException(nameof(serverKey));
}
_Parameters = new SolverParameters(serverKey);
InternalState = new State();
}
private unsafe static bool TryGetPublicKeyFromPublicKeyBlob(byte *blob, int blobLen, out ImmutableArray <byte> publicKey)
{
BlobHeader header = Marshal.PtrToStructure <BlobHeader>((IntPtr)blob);
RsaPubKey rsaPubKey = Marshal.PtrToStructure <RsaPubKey>((IntPtr)(blob + sizeof(BlobHeader)));
byte[] modulus = new byte[rsaPubKey.BitLen >> 3];
// The key blob data just contains the modulus
if (blobLen - s_offsetToKeyData != modulus.Length)
{
publicKey = ImmutableArray <byte> .Empty;
return(false);
}
Marshal.Copy((IntPtr)(blob + s_offsetToKeyData), modulus, 0, modulus.Length);
publicKey = CreateSnPublicKeyBlob(header, rsaPubKey, modulus);
return(true);
}
internal unsafe static bool TryGetPublicKeyFromPrivateKeyBlob(byte[] blob, out byte[] publicKey)
{
fixed(byte *blobPtr = blob)
{
var header = (BlobHeader *)blobPtr;
var rsa = (RsaPubKey *)(blobPtr + sizeof(BlobHeader));
var version = header->Version;
var modulusBitLength = rsa->BitLen;
var exponent = rsa->PubExp;
var modulus = new byte[modulusBitLength >> 3];
if (blob.Length - s_offsetToKeyData < modulus.Length)
{
publicKey = null;
return(false);
}
Marshal.Copy((IntPtr)(blobPtr + s_offsetToKeyData), modulus, 0, modulus.Length);
var newHeader = new BlobHeader()
{
Type = PublicKeyBlobId,
Version = version,
Reserved = 0,
AlgId = AlgorithmId.RsaSign
};
var newRsaKey = new RsaPubKey()
{
Magic = RSA1, // Public key
BitLen = modulusBitLength,
PubExp = exponent
};
publicKey = CreateSnPublicKeyBlob(newHeader, newRsaKey, modulus);
return(true);
}
}
private unsafe static bool TryGetPublicKeyFromPrivateKeyBlob(byte *blob, int blobLen, out ImmutableArray <byte> publicKey)
{
BlobHeader *header = (BlobHeader *)blob;
RsaPubKey * rsa = (RsaPubKey *)(blob + sizeof(BlobHeader));
byte version = header->Version;
uint modulusBitLength = rsa->BitLen;
uint exponent = rsa->PubExp;
byte[] modulus = new byte[modulusBitLength >> 3];
if (blobLen - s_offsetToKeyData < modulus.Length)
{
publicKey = ImmutableArray <byte> .Empty;
return(false);
}
Marshal.Copy((IntPtr)(blob + s_offsetToKeyData), modulus, 0, modulus.Length);
BlobHeader newHeader = new BlobHeader()
{
Type = PublicKeyBlobId,
Version = version,
Reserved = 0,
AlgId = AlgorithmId.RsaSign
};
RsaPubKey newRsaKey = new RsaPubKey()
{
Magic = RSA1, // Public key
BitLen = modulusBitLength,
PubExp = exponent
};
publicKey = CreateSnPublicKeyBlob(newHeader, newRsaKey, modulus);
return(true);
}
private unsafe static bool TryGetPublicKeyFromPrivateKeyBlob(byte* blob, int blobLen, out ImmutableArray<byte> publicKey)
{
var header = (BlobHeader*)blob;
var rsa = (RsaPubKey*)(blob + sizeof(BlobHeader));
var version = header->Version;
var modulusBitLength = rsa->BitLen;
var exponent = rsa->PubExp;
var modulus = new byte[modulusBitLength >> 3];
if (blobLen - s_offsetToKeyData < modulus.Length)
{
publicKey = ImmutableArray<byte>.Empty;
return false;
}
Marshal.Copy((IntPtr)(blob + s_offsetToKeyData), modulus, 0, modulus.Length);
var newHeader = new BlobHeader()
{
Type = PublicKeyBlobId,
Version = version,
Reserved = 0,
AlgId = AlgorithmId.RsaSign
};
var newRsaKey = new RsaPubKey()
{
Magic = RSA1, // Public key
BitLen = modulusBitLength,
PubExp = exponent
};
publicKey = CreateSnPublicKeyBlob(newHeader, newRsaKey, modulus);
return true;
}
private static ImmutableArray<byte> CreateSnPublicKeyBlob(BlobHeader header, RsaPubKey rsa, byte[] pubKeyData)
{
var snPubKey = new SnPublicKeyBlob()
{
SigAlgId = AlgorithmId.RsaSign,
HashAlgId = AlgorithmId.Sha,
PublicKeySize = (UInt32)(s_offsetToKeyData + pubKeyData.Length)
};
using (var ms = new MemoryStream(160))
using (var binaryWriter = new BinaryWriter(ms))
{
binaryWriter.Write(snPubKey.SigAlgId);
binaryWriter.Write(snPubKey.HashAlgId);
binaryWriter.Write(snPubKey.PublicKeySize);
binaryWriter.Write(header.Type);
binaryWriter.Write(header.Version);
binaryWriter.Write(header.Reserved);
binaryWriter.Write(header.AlgId);
binaryWriter.Write(rsa.Magic);
binaryWriter.Write(rsa.BitLen);
binaryWriter.Write(rsa.PubExp);
binaryWriter.Write(pubKeyData);
return ms.ToImmutable();
}
}
public PromiseParameters(RsaPubKey serverKey) : this()
{
ServerKey = serverKey ?? throw new ArgumentNullException(nameof(serverKey));
}
public XORKey(RsaPubKey pubKey) : this(Utils.GenerateEncryptableInteger(pubKey._Key))
{
}