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Feature | AE with enclaves - multi-platform and .NET Standard 2.1 sup…
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3 changes: 2 additions & 1 deletion
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src/Microsoft.Data.SqlClient/netcore/ref/Microsoft.Data.SqlClient.csproj
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...nt/netcore/src/Microsoft/Data/SqlClient/AlwaysEncryptedEnclaveProviderUtils.NetCoreApp.cs
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...ata.SqlClient/netcore/src/Microsoft/Data/SqlClient/AlwaysEncryptedEnclaveProviderUtils.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
| // See the LICENSE file in the project root for more information. | ||
|
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| using System; | ||
| using System.Diagnostics; | ||
| using System.Linq; | ||
| using System.Security.Cryptography; | ||
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| namespace Microsoft.Data.SqlClient | ||
| { | ||
| internal class EnclavePublicKey | ||
| { | ||
| public byte[] PublicKey { get; set; } | ||
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| public EnclavePublicKey(byte[] payload) | ||
| { | ||
| PublicKey = payload; | ||
| } | ||
| } | ||
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| internal class EnclaveDiffieHellmanInfo | ||
| { | ||
| public int Size { get; private set; } | ||
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| public byte[] PublicKey { get; private set; } | ||
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| public byte[] PublicKeySignature { get; private set; } | ||
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| public EnclaveDiffieHellmanInfo(byte[] payload) | ||
| { | ||
| Size = payload.Length; | ||
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| int offset = 0; | ||
| int publicKeySize = BitConverter.ToInt32(payload, offset); | ||
| offset += sizeof(int); | ||
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| int publicKeySignatureSize = BitConverter.ToInt32(payload, offset); | ||
| offset += sizeof(int); | ||
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| PublicKey = payload.Skip(offset).Take(publicKeySize).ToArray(); | ||
| offset += publicKeySize; | ||
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| PublicKeySignature = payload.Skip(offset).Take(publicKeySignatureSize).ToArray(); | ||
| offset += publicKeySignatureSize; | ||
| } | ||
| } | ||
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| internal enum EnclaveType | ||
| { | ||
| None = 0, | ||
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| Vbs = 1, | ||
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| Sgx = 2 | ||
| } | ||
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| // Contains methods to convert cryptography keys between different formats. | ||
| internal sealed class KeyConverter | ||
| { | ||
| // The RSA public key blob is structured as follows: | ||
| // BCRYPT_RSAKEY_BLOB header | ||
| // byte[ExponentSize] publicExponent | ||
| // byte[ModulusSize] modulus | ||
| private readonly struct RSAPublicKeyBlob | ||
| { | ||
| // Size of an RSA public key blob | ||
| internal static readonly int Size = 539; | ||
| // Size of the BCRYPT_RSAKEY_BLOB header | ||
| internal static readonly int HeaderSize = 27; | ||
| // Size of the exponent (final 3 bytes of the header) | ||
| internal static readonly int ExponentSize = 3; | ||
| // Size of the modulus (remaining bytes after the header) | ||
| internal static readonly int ModulusSize = Size - HeaderSize; | ||
| internal static readonly int ExponentOffset = HeaderSize - ExponentSize; | ||
| internal static readonly int ModulusOffset = HeaderSize; | ||
| } | ||
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| // Extracts the public key's modulus and exponent from an RSA public key blob | ||
| // and returns an RSAParameters object | ||
| internal static RSAParameters RSAPublicKeyBlobToParams(byte[] keyBlob) | ||
| { | ||
| Debug.Assert(keyBlob.Length == RSAPublicKeyBlob.Size, | ||
| $"RSA public key blob was not the expected length. Actual: {keyBlob.Length}. Expected: {RSAPublicKeyBlob.Size}"); | ||
| return new RSAParameters() | ||
| { | ||
| Exponent = keyBlob.Skip(RSAPublicKeyBlob.ExponentOffset).Take(RSAPublicKeyBlob.ExponentSize).ToArray(), | ||
| Modulus = keyBlob.Skip(RSAPublicKeyBlob.ModulusOffset).Take(RSAPublicKeyBlob.ModulusSize).ToArray() | ||
| }; | ||
| } | ||
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| // The ECC public key blob is structured as follows: | ||
| // BCRYPT_ECCKEY_BLOB header | ||
| // byte[KeySize] X | ||
| // byte[KeySize] Y | ||
| private readonly struct ECCPublicKeyBlob | ||
| { | ||
| // Size of an ECC public key blob | ||
| internal static readonly int Size = 104; | ||
| // Size of the BCRYPT_ECCKEY_BLOB header | ||
| internal static readonly int HeaderSize = 8; | ||
| // Size of each coordinate | ||
| internal static readonly int KeySize = (Size - HeaderSize) / 2; | ||
| } | ||
|
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| // Magic numbers identifying blob types | ||
| // https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-wcce/cba27df5-4880-4f95-a879-783f8657e53b | ||
| private readonly struct KeyBlobMagicNumber | ||
| { | ||
| internal static readonly byte[] ECDHPublicP384 = new byte[] { 0x45, 0x43, 0x4b, 0x33 }; | ||
| } | ||
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| // Extracts the public key's X and Y coordinates from an ECC public key blob | ||
| // and returns an ECParameters object | ||
| internal static ECParameters ECCPublicKeyBlobToParams(byte[] keyBlob) | ||
| { | ||
| Debug.Assert(keyBlob.Length == ECCPublicKeyBlob.Size, | ||
| $"ECC public key blob was not the expected length. Actual: {keyBlob.Length}. Expected: {ECCPublicKeyBlob.Size}"); | ||
| return new ECParameters | ||
| { | ||
| Curve = ECCurve.NamedCurves.nistP384, | ||
| Q = new ECPoint | ||
| { | ||
| X = keyBlob.Skip(ECCPublicKeyBlob.HeaderSize).Take(ECCPublicKeyBlob.KeySize).ToArray(), | ||
| Y = keyBlob.Skip(ECCPublicKeyBlob.HeaderSize + ECCPublicKeyBlob.KeySize).Take(ECCPublicKeyBlob.KeySize).ToArray() | ||
| }, | ||
| }; | ||
| } | ||
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| // Serializes an ECDiffieHellmanPublicKey to an ECC public key blob | ||
| // "ECDiffieHellmanPublicKey.ToByteArray() doesn't have a (standards-)defined export | ||
| // format. The version used by ECDiffieHellmanPublicKeyCng is Windows-specific" | ||
| // from https://github.com/dotnet/runtime/issues/27276 | ||
| // => ECDiffieHellmanPublicKey.ToByteArray() is not supported in Unix | ||
| internal static byte[] ECDHPublicKeyToECCKeyBlob(ECDiffieHellmanPublicKey publicKey) | ||
| { | ||
| byte[] keyBlob = new byte[ECCPublicKeyBlob.Size]; | ||
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| // Set magic number | ||
| Array.Copy(KeyBlobMagicNumber.ECDHPublicP384, 0, keyBlob, 0, 4); | ||
| // Set key size | ||
| keyBlob[4] = (byte)ECCPublicKeyBlob.KeySize; | ||
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| ECPoint ecPoint = publicKey.ExportParameters().Q; | ||
| Debug.Assert(ecPoint.X.Length == ECCPublicKeyBlob.KeySize && ecPoint.Y.Length == ECCPublicKeyBlob.KeySize, | ||
| $"ECDH public key was not the expected length. Actual (X): {ecPoint.X.Length}. Actual (Y): {ecPoint.Y.Length} Expected: {ECCPublicKeyBlob.Size}"); | ||
| // Copy x and y coordinates to key blob | ||
| Array.Copy(ecPoint.X, 0, keyBlob, ECCPublicKeyBlob.HeaderSize, ECCPublicKeyBlob.KeySize); | ||
| Array.Copy(ecPoint.Y, 0, keyBlob, ECCPublicKeyBlob.HeaderSize + ECCPublicKeyBlob.KeySize, ECCPublicKeyBlob.KeySize); | ||
| return keyBlob; | ||
| } | ||
| } | ||
| } |
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