mirror of
https://github.com/kwsch/PKHeX
synced 2024-11-23 12:33:06 +00:00
363 lines
12 KiB
C#
363 lines
12 KiB
C#
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using System;
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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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_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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/// <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(byte[] data, uint sv, int blockSize)
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{
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byte[] sdata = (byte[])data.Clone();
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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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Array.Copy(data, 8 + (blockSize * ofs), sdata, 8 + (blockSize * block), blockSize);
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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(byte[] ekm)
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{
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uint pv = BitConverter.ToUInt32(ekm, 0);
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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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/// 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(byte[] pkm)
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{
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uint pv = BitConverter.ToUInt32(pkm, 0);
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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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/// 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(byte[] ekm)
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{
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uint pv = BitConverter.ToUInt32(ekm, 0);
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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(byte[] pkm)
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{
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uint pv = BitConverter.ToUInt32(pkm, 0);
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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(byte[] ekm)
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{
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uint pv = BitConverter.ToUInt32(ekm, 0);
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uint chk = BitConverter.ToUInt16(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(byte[] pkm)
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{
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uint pv = BitConverter.ToUInt32(pkm, 0);
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uint chk = BitConverter.ToUInt16(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(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, 8, 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(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(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, ref seed, i); i += 2;
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Crypt(data, ref seed, i); 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(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(in byte[] data, ref uint seed, in int i)
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{
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seed = (0x41C64E6D * seed) + 0x00006073;
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data[i] ^= (byte)(seed >> 16);
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data[i + 1] ^= (byte)(seed >> 24);
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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(byte[] ekm)
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{
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Debug.Assert(ekm.Length == SIZE_3PARTY || ekm.Length == SIZE_3STORED);
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uint PID = BitConverter.ToUInt32(ekm, 0);
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uint OID = BitConverter.ToUInt32(ekm, 4);
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uint seed = PID ^ OID;
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byte[] xorkey = BitConverter.GetBytes(seed);
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for (int i = 32; i < 80; i++)
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ekm[i] ^= xorkey[i & 3];
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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">Unshuffled data.</param>
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/// <param name="sv">Block order shuffle value</param>
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/// <returns>Unshuffled data.</returns>
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private static byte[] ShuffleArray3(byte[] data, uint sv)
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{
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byte[] sdata = (byte[])data.Clone();
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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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Array.Copy(data, 32 + (12 * ofs), sdata, 32 + (12 * block), 12);
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}
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// Fill the Battle Stats back
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if (data.Length > SIZE_3STORED)
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Array.Copy(data, SIZE_3STORED, sdata, SIZE_3STORED, data.Length - SIZE_3STORED);
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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(byte[] pkm)
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{
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Debug.Assert(pkm.Length == SIZE_3PARTY || pkm.Length == SIZE_3STORED);
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uint PID = BitConverter.ToUInt32(pkm, 0);
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uint OID = BitConverter.ToUInt32(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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byte[] xorkey = BitConverter.GetBytes(seed);
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for (int i = 32; i < SIZE_3STORED; i++)
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ekm[i] ^= xorkey[i & 3];
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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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public static ushort GetCHK(byte[] data)
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{
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ushort chk = 0;
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for (int i = 8; i < SIZE_6STORED; i += 2)
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chk += BitConverter.ToUInt16(data, 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(byte[] data)
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{
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ushort chk = 0;
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for (int i = 0x20; i < SIZE_3STORED; i += 2)
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chk += BitConverter.ToUInt16(data, i);
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return chk;
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}
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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 != BitConverter.ToUInt16(pkm, 0x1C))
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pkm = DecryptArray3(pkm);
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}
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public static void DecryptIfEncrypted45(ref byte[] pkm)
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{
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if (BitConverter.ToUInt16(pkm, 4) != 0) // BK4
|
|||
|
|
return;
|
|||
|
|
if (BitConverter.ToUInt32(pkm, 0x64) != 0)
|
|||
|
|
pkm = DecryptArray45(pkm);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static void DecryptIfEncrypted67(ref byte[] pkm)
|
|||
|
|
{
|
|||
|
|
if (BitConverter.ToUInt16(pkm, 0xC8) != 0 && BitConverter.ToUInt16(pkm, 0x58) != 0)
|
|||
|
|
pkm = DecryptArray6(pkm);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public static void DecryptIfEncrypted8(ref byte[] pkm)
|
|||
|
|
{
|
|||
|
|
if (BitConverter.ToUInt16(pkm, 0x70) != 0 && BitConverter.ToUInt16(pkm, 0xC0) != 0)
|
|||
|
|
pkm = DecryptArray8(pkm);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|