// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;

namespace Microsoft.DotNet.StrongName;

internal static class Constants
{
    // Checksum offset in the PE header.
    internal const int ChecksumOffsetInPEHeader = 0x40;
    internal const int CheckSumSize = sizeof(uint);

    // Internal constants obtained from runtime's
    // src/libraries/System.Reflection.Metadata/src/System/Reflection/PortableExecutable/PEHeader.cs
    internal const int PEHeaderSize32Bit = 224;
    internal const int PEHeaderSize64Bit = 240;
    internal const int PESectionHeaderSize = 40;
    internal const int AuthenticodeDirectorySize = 2 * sizeof(int);
    internal const int SnPublicKeyHeaderSize = 12;

    internal const int BlobHeaderSize = sizeof(byte) + sizeof(byte) + sizeof(ushort) + sizeof(uint);
    internal const int RsaPubKeySize = sizeof(uint) + sizeof(uint) + sizeof(uint);

    internal const UInt32 RSA1 = 0x31415352;
    internal const UInt32 RSA2 = 0x32415352;

    // In wincrypt.h both public and private key blobs start with a
    // PUBLICKEYSTRUC and RSAPUBKEY and then start the key data
    internal const int OffsetToKeyData = BlobHeaderSize + RsaPubKeySize;

    // From wincrypt.h
    internal const byte PublicKeyBlobId = 0x06;
    internal const byte PrivateKeyBlobId = 0x07;

    // from winnt.h
    internal const int FlagsOffsetInCorHeader = sizeof(uint) + // cb
                                               sizeof(ushort) + // MajorRuntimeVersion
                                               sizeof(ushort) + // MinorRuntimeVersion
                                               sizeof(uint) * 2; // MetaData
    internal const int CorFlagsSize = sizeof(uint);

    /// <summary>
    /// Neutral public key indicates that the ECMA key was used to strong name the binary.
    /// </summary>
    internal static readonly byte[] NeutralPublicKey = { 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0 };

    // ECMA key
    internal static readonly byte[] ECMAKey =
    {
        0x00,0x24,0x00,0x00,0x04,0x80,0x00,0x00,0x94,0x00,0x00,0x00,0x06,0x02,0x00,0x00,
        0x00,0x24,0x00,0x00,0x52,0x53,0x41,0x31,0x00,0x04,0x00,0x00,0x01,0x00,0x01,0x00,
        0x07,0xd1,0xfa,0x57,0xc4,0xae,0xd9,0xf0,0xa3,0x2e,0x84,0xaa,0x0f,0xae,0xfd,0x0d,
        0xe9,0xe8,0xfd,0x6a,0xec,0x8f,0x87,0xfb,0x03,0x76,0x6c,0x83,0x4c,0x99,0x92,0x1e,
        0xb2,0x3b,0xe7,0x9a,0xd9,0xd5,0xdc,0xc1,0xdd,0x9a,0xd2,0x36,0x13,0x21,0x02,0x90,
        0x0b,0x72,0x3c,0xf9,0x80,0x95,0x7f,0xc4,0xe1,0x77,0x10,0x8f,0xc6,0x07,0x77,0x4f,
        0x29,0xe8,0x32,0x0e,0x92,0xea,0x05,0xec,0xe4,0xe8,0x21,0xc0,0xa5,0xef,0xe8,0xf1,
        0x64,0x5c,0x4c,0x0c,0x93,0xc1,0xab,0x99,0x28,0x5d,0x62,0x2c,0xaa,0x65,0x2c,0x1d,
        0xfa,0xd6,0x3d,0x74,0x5d,0x6f,0x2d,0xe5,0xf1,0x7e,0x5e,0xaf,0x0f,0xc4,0x96,0x3d,
        0x26,0x1c,0x8a,0x12,0x43,0x65,0x18,0x20,0x6d,0xc0,0x93,0x34,0x4d,0x5a,0xd2,0x93
    };
}