mirror of
https://github.com/kwsch/PKHeX
synced 2024-12-24 11:23:11 +00:00
441 lines
16 KiB
C#
441 lines
16 KiB
C#
using System;
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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using static System.Buffers.Binary.BinaryPrimitives;
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namespace PKHeX.Core
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{
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/// <summary>
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/// Logic related to Encrypting and Decrypting Pokémon entity data.
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/// </summary>
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public static class PokeCrypto
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{
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internal const int SIZE_1ULIST = 69;
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internal const int SIZE_1JLIST = 59;
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internal const int SIZE_1PARTY = 44;
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internal const int SIZE_1STORED = 33;
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internal const int SIZE_2ULIST = 73;
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internal const int SIZE_2JLIST = 63;
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internal const int SIZE_2PARTY = 48;
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internal const int SIZE_2STORED = 32;
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internal const int SIZE_2STADIUM = 60;
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internal const int SIZE_3CSTORED = 312;
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internal const int SIZE_3XSTORED = 196;
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internal const int SIZE_3PARTY = 100;
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internal const int SIZE_3STORED = 80;
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internal const int SIZE_3BLOCK = 12;
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internal const int SIZE_4PARTY = 236;
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internal const int SIZE_4STORED = 136;
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internal const int SIZE_4BLOCK = 32;
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internal const int SIZE_5PARTY = 220;
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internal const int SIZE_5STORED = 136;
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internal const int SIZE_5BLOCK = 32;
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internal const int SIZE_6PARTY = 0x104;
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internal const int SIZE_6STORED = 0xE8;
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internal const int SIZE_6BLOCK = 56;
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// Gen7 Format is the same size as Gen6.
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internal const int SIZE_8STORED = 8 + (4 * SIZE_8BLOCK); // 0x148
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internal const int SIZE_8PARTY = SIZE_8STORED + 0x10; // 0x158
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internal const int SIZE_8BLOCK = 80; // 0x50
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internal const int SIZE_8ASTORED = 8 + (4 * SIZE_8ABLOCK); // 0x168
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internal const int SIZE_8APARTY = SIZE_8ASTORED + 0x10; // 0x178
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internal const int SIZE_8ABLOCK = 88; // 0x58
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/// <summary>
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/// Positions for shuffling.
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/// </summary>
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private static readonly byte[] BlockPosition =
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{
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0, 1, 2, 3,
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0, 1, 3, 2,
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0, 2, 1, 3,
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0, 3, 1, 2,
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0, 2, 3, 1,
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0, 3, 2, 1,
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1, 0, 2, 3,
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1, 0, 3, 2,
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2, 0, 1, 3,
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3, 0, 1, 2,
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2, 0, 3, 1,
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3, 0, 2, 1,
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1, 2, 0, 3,
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1, 3, 0, 2,
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2, 1, 0, 3,
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3, 1, 0, 2,
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2, 3, 0, 1,
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3, 2, 0, 1,
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1, 2, 3, 0,
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1, 3, 2, 0,
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2, 1, 3, 0,
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3, 1, 2, 0,
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2, 3, 1, 0,
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3, 2, 1, 0,
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// duplicates of 0-7 to eliminate modulus
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0, 1, 2, 3,
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0, 1, 3, 2,
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0, 2, 1, 3,
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0, 3, 1, 2,
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0, 2, 3, 1,
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0, 3, 2, 1,
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1, 0, 2, 3,
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1, 0, 3, 2,
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};
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/// <summary>
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/// Positions for unshuffling.
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/// </summary>
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internal static readonly byte[] blockPositionInvert =
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{
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0, 1, 2, 4, 3, 5, 6, 7, 12, 18, 13, 19, 8, 10, 14, 20, 16, 22, 9, 11, 15, 21, 17, 23,
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0, 1, 2, 4, 3, 5, 6, 7, // duplicates of 0-7 to eliminate modulus
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};
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/// <summary>
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/// Shuffles a 232 byte array containing Pokémon data.
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/// </summary>
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/// <param name="data">Data to shuffle</param>
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/// <param name="sv">Block Shuffle order</param>
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/// <param name="blockSize">Size of shuffling chunks</param>
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/// <returns>Shuffled byte array</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static byte[] ShuffleArray(ReadOnlySpan<byte> data, uint sv, int blockSize)
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{
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byte[] sdata = data.ToArray();
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uint index = sv * 4;
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const int start = 8;
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for (int block = 0; block < 4; block++)
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{
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int ofs = BlockPosition[index + block];
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var src = data.Slice(start + (blockSize * ofs), blockSize);
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var dest = sdata.AsSpan(start + (blockSize * block), blockSize);
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src.CopyTo(dest);
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}
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return sdata;
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}
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/// <summary>
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/// Decrypts a Gen8 pkm byte array.
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/// </summary>
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/// <param name="ekm">Encrypted Pokémon data.</param>
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/// <returns>Decrypted Pokémon data.</returns>
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/// <returns>Encrypted Pokémon data.</returns>
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public static byte[] DecryptArray8(Span<byte> ekm)
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{
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uint pv = ReadUInt32LittleEndian(ekm);
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uint sv = pv >> 13 & 31;
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CryptPKM(ekm, pv, SIZE_8BLOCK);
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return ShuffleArray(ekm, sv, SIZE_8BLOCK);
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}
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/// <summary>
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/// Decrypts a Gen8 pkm byte array.
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/// </summary>
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/// <param name="ekm">Encrypted Pokémon data.</param>
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/// <returns>Decrypted Pokémon data.</returns>
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/// <returns>Encrypted Pokémon data.</returns>
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public static byte[] DecryptArray8A(Span<byte> ekm)
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{
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uint pv = ReadUInt32LittleEndian(ekm);
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uint sv = pv >> 13 & 31;
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CryptPKM(ekm, pv, SIZE_8ABLOCK);
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return ShuffleArray(ekm, sv, SIZE_8ABLOCK);
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}
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/// <summary>
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/// Encrypts a Gen8 pkm byte array.
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/// </summary>
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/// <param name="pkm">Decrypted Pokémon data.</param>
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public static byte[] EncryptArray8(Span<byte> pkm)
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{
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uint pv = ReadUInt32LittleEndian(pkm);
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uint sv = pv >> 13 & 31;
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byte[] ekm = ShuffleArray(pkm, blockPositionInvert[sv], SIZE_8BLOCK);
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CryptPKM(ekm, pv, SIZE_8BLOCK);
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return ekm;
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}
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/// <summary>
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/// Encrypts a Gen8 pkm byte array.
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/// </summary>
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/// <param name="pkm">Decrypted Pokémon data.</param>
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public static byte[] EncryptArray8A(Span<byte> pkm)
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{
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uint pv = ReadUInt32LittleEndian(pkm);
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uint sv = pv >> 13 & 31;
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byte[] ekm = ShuffleArray(pkm, blockPositionInvert[sv], SIZE_8ABLOCK);
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CryptPKM(ekm, pv, SIZE_8ABLOCK);
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return ekm;
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}
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/// <summary>
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/// Decrypts a 232 byte + party stat byte array.
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/// </summary>
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/// <param name="ekm">Encrypted Pokémon data.</param>
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/// <returns>Decrypted Pokémon data.</returns>
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/// <returns>Encrypted Pokémon data.</returns>
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public static byte[] DecryptArray6(Span<byte> ekm)
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{
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uint pv = ReadUInt32LittleEndian(ekm);
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uint sv = pv >> 13 & 31;
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CryptPKM(ekm, pv, SIZE_6BLOCK);
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return ShuffleArray(ekm, sv, SIZE_6BLOCK);
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}
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/// <summary>
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/// Encrypts a 232 byte + party stat byte array.
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/// </summary>
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/// <param name="pkm">Decrypted Pokémon data.</param>
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public static byte[] EncryptArray6(Span<byte> pkm)
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{
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uint pv = ReadUInt32LittleEndian(pkm);
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uint sv = pv >> 13 & 31;
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byte[] ekm = ShuffleArray(pkm, blockPositionInvert[sv], SIZE_6BLOCK);
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CryptPKM(ekm, pv, SIZE_6BLOCK);
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return ekm;
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}
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/// <summary>
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/// Decrypts a 136 byte + party stat byte array.
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/// </summary>
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/// <param name="ekm">Encrypted Pokémon data.</param>
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/// <returns>Decrypted Pokémon data.</returns>
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public static byte[] DecryptArray45(Span<byte> ekm)
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{
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uint pv = ReadUInt32LittleEndian(ekm);
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uint chk = ReadUInt16LittleEndian(ekm[6..]);
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uint sv = pv >> 13 & 31;
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CryptPKM45(ekm, pv, chk, SIZE_4BLOCK);
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return ShuffleArray(ekm, sv, SIZE_4BLOCK);
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}
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/// <summary>
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/// Encrypts a 136 byte + party stat byte array.
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/// </summary>
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/// <param name="pkm">Decrypted Pokémon data.</param>
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/// <returns>Encrypted Pokémon data.</returns>
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public static byte[] EncryptArray45(Span<byte> pkm)
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{
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uint pv = ReadUInt32LittleEndian(pkm);
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uint chk = ReadUInt16LittleEndian(pkm[6..]);
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uint sv = pv >> 13 & 31;
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byte[] ekm = ShuffleArray(pkm, blockPositionInvert[sv], SIZE_4BLOCK);
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CryptPKM45(ekm, pv, chk, SIZE_4BLOCK);
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return ekm;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static void CryptPKM(Span<byte> data, uint pv, int blockSize)
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{
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const int start = 8;
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int end = (4 * blockSize) + start;
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CryptArray(data, pv, start, end); // Blocks
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if (data.Length > end)
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CryptArray(data, pv, end, data.Length); // Party Stats
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static void CryptPKM45(Span<byte> data, uint pv, uint chk, int blockSize)
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{
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const int start = 8;
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int end = (4 * blockSize) + start;
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CryptArray(data, chk, start, end); // Blocks
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if (data.Length > end)
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CryptArray(data, pv, end, data.Length); // Party Stats
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void CryptArray(Span<byte> data, uint seed, int start, int end)
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{
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int i = start;
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do // all block sizes are multiples of 4
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{
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Crypt(data[i..], ref seed); i += 2;
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Crypt(data[i..], ref seed); i += 2;
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}
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while (i < end);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void CryptArray(Span<byte> data, uint seed) => CryptArray(data, seed, 0, data.Length);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static void Crypt(Span<byte> data, ref uint seed)
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{
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seed = (0x41C64E6D * seed) + 0x00006073;
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var current = ReadUInt16LittleEndian(data);
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current ^= (ushort)(seed >> 16);
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WriteUInt16LittleEndian(data, current);
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}
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/// <summary>
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/// Decrypts an 80 byte format Generation 3 Pokémon byte array.
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/// </summary>
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/// <param name="ekm">Encrypted data.</param>
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/// <returns>Decrypted data.</returns>
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public static byte[] DecryptArray3(Span<byte> ekm)
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{
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Debug.Assert(ekm.Length is SIZE_3PARTY or SIZE_3STORED);
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uint PID = ReadUInt32LittleEndian(ekm);
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uint OID = ReadUInt32LittleEndian(ekm[4..]);
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uint seed = PID ^ OID;
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var toEncrypt = ekm[32..SIZE_3STORED];
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for (int i = 0; i < toEncrypt.Length; i += 4)
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{
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var span = toEncrypt.Slice(i, 4);
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var chunk = ReadUInt32LittleEndian(span);
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var update = chunk ^ seed;
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WriteUInt32LittleEndian(span, update);
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}
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return ShuffleArray3(ekm, PID % 24);
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}
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/// <summary>
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/// Shuffles an 80 byte format Generation 3 Pokémon byte array.
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/// </summary>
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/// <param name="data">Un-shuffled data.</param>
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/// <param name="sv">Block order shuffle value</param>
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/// <returns>Un-shuffled data.</returns>
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private static byte[] ShuffleArray3(Span<byte> data, uint sv)
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{
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byte[] sdata = data.ToArray();
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uint index = sv * 4;
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for (int block = 0; block < 4; block++)
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{
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int ofs = BlockPosition[index + block];
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var src = data.Slice(32 + (12 * ofs), 12);
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var dest = sdata.AsSpan(32 + (12 * block), 12);
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src.CopyTo(dest);
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}
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return sdata;
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}
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/// <summary>
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/// Encrypts an 80 byte format Generation 3 Pokémon byte array.
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/// </summary>
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/// <param name="pkm">Decrypted data.</param>
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/// <returns>Encrypted data.</returns>
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public static byte[] EncryptArray3(Span<byte> pkm)
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{
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Debug.Assert(pkm.Length is SIZE_3PARTY or SIZE_3STORED);
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uint PID = ReadUInt32LittleEndian(pkm);
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uint OID = ReadUInt32LittleEndian(pkm[4..]);
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uint seed = PID ^ OID;
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byte[] ekm = ShuffleArray3(pkm, blockPositionInvert[PID % 24]);
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var toEncrypt = ekm.AsSpan()[32..SIZE_3STORED];
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for (int i = 0; i < toEncrypt.Length; i += 4)
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{
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var span = toEncrypt.Slice(i, 4);
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var chunk = ReadUInt32LittleEndian(span);
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var update = chunk ^ seed;
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WriteUInt32LittleEndian(span, update);
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}
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return ekm;
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}
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/// <summary>
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/// Gets the checksum of a 232 byte array.
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/// </summary>
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/// <param name="data">Decrypted Pokémon data.</param>
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/// <param name="partyStart">Offset at which the Stored data ends and the Party data starts.</param>
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public static ushort GetCHK(ReadOnlySpan<byte> data, int partyStart)
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{
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ushort chk = 0;
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var span = data[0x08..partyStart];
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for (int i = 0; i < span.Length; i += 2)
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chk += ReadUInt16LittleEndian(span[i..]);
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return chk;
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}
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/// <summary>
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/// Gets the checksum of a Generation 3 byte array.
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/// </summary>
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/// <param name="data">Decrypted Pokémon data.</param>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static ushort GetCHK3(ReadOnlySpan<byte> data)
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{
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ushort chk = 0;
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var span = data[0x20..SIZE_3STORED];
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for (int i = 0; i < span.Length; i += 2)
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chk += ReadUInt16LittleEndian(span[i..]);
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return chk;
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}
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/// <summary>
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/// Decrypts the input <see cref="pkm"/> data into a new array if it is encrypted, and updates the reference.
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/// </summary>
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/// <remarks>Generation 3 Format encryption check which verifies the checksum</remarks>
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public static void DecryptIfEncrypted3(ref byte[] pkm)
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{
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ushort chk = GetCHK3(pkm);
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if (chk != ReadUInt16LittleEndian(pkm.AsSpan(0x1C)))
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pkm = DecryptArray3(pkm);
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}
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/// <summary>
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/// Decrypts the input <see cref="pkm"/> data into a new array if it is encrypted, and updates the reference.
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/// </summary>
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/// <remarks>Generation 4 & 5 Format encryption check which checks for the unused bytes</remarks>
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public static void DecryptIfEncrypted45(ref byte[] pkm)
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{
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var span = pkm.AsSpan();
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if (ReadUInt32LittleEndian(span[0x64..]) != 0)
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pkm = DecryptArray45(span);
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}
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/// <summary>
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/// Decrypts the input <see cref="pkm"/> data into a new array if it is encrypted, and updates the reference.
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/// </summary>
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/// <remarks>Generation 6 & 7 Format encryption check</remarks>
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public static void DecryptIfEncrypted67(ref byte[] pkm)
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{
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var span = pkm.AsSpan();
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if (ReadUInt16LittleEndian(span[0xC8..]) != 0 || ReadUInt16LittleEndian(span[0x58..]) != 0)
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pkm = DecryptArray6(span);
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}
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/// <summary>
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/// Decrypts the input <see cref="pkm"/> data into a new array if it is encrypted, and updates the reference.
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/// </summary>
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/// <remarks>Generation 8 Format encryption check</remarks>
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public static void DecryptIfEncrypted8(ref byte[] pkm)
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{
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var span = pkm.AsSpan();
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if (ReadUInt16LittleEndian(span[0x70..]) != 0 || ReadUInt16LittleEndian(span[0x110..]) != 0)
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pkm = DecryptArray8(span);
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}
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/// <summary>
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/// Decrypts the input <see cref="pkm"/> data into a new array if it is encrypted, and updates the reference.
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/// </summary>
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/// <remarks>Generation 8 Format encryption check</remarks>
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public static void DecryptIfEncrypted8A(ref byte[] pkm)
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{
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var span = pkm.AsSpan();
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if (ReadUInt16LittleEndian(span[0x78..]) != 0 || ReadUInt16LittleEndian(span[0x128..]) != 0)
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pkm = DecryptArray8A(span);
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}
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}
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}
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