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.gitignore vendored Normal file
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# ignore hidden .vs directory created by visual studio
.vs/
# ignore bin and obj directories completely
[Bb]in/
[Oo]bj/

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EamuseCardConvert.sln Normal file
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 16
VisualStudioVersion = 16.0.29503.13
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EamuseCardConvert", "EamuseCardConvert\EamuseCardConvert.csproj", "{C23961F2-74D9-4EC3-BBC1-7A8996F6BBD6}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{C23961F2-74D9-4EC3-BBC1-7A8996F6BBD6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{C23961F2-74D9-4EC3-BBC1-7A8996F6BBD6}.Debug|Any CPU.Build.0 = Debug|Any CPU
{C23961F2-74D9-4EC3-BBC1-7A8996F6BBD6}.Release|Any CPU.ActiveCfg = Release|Any CPU
{C23961F2-74D9-4EC3-BBC1-7A8996F6BBD6}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {144459AF-2119-4BE9-9D35-6EBC2C34F467}
EndGlobalSection
EndGlobal

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EamuseCardConvert/CardCipher.cs Normal file
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/*
* Converted from python to C# based on source provided by
* DragonMinded
* https://github.com/DragonMinded/bemaniutils/blob/master/bemani/common/card.py
*/
using System;
namespace EamuseCardConvert
{
/// <summary>
/// Algorithm for converting between the Card ID as stored in an
/// eAmusement card and the 16 character card string as shown on
/// the back of a card and in-game.
/// </summary>
public static class CardCipher
{
private static readonly uint[] _key = new uint[]
{
0x20d0d03c, 0x868ecb41, 0xbcd89c84, 0x4c0e0d0d,
0x84fc30ac, 0x4cc1890e, 0xfc5418a4, 0x02c50f44,
0x68acb4e0, 0x06cd4a4e, 0xcc28906c, 0x4f0c8ac0,
0xb03ca468, 0x884ac7c4, 0x389490d8, 0xcf80c6c2,
0x58d87404, 0xc48ec444, 0xb4e83c50, 0x498d0147,
0x64f454c0, 0x4c4701c8, 0xec302cc4, 0xc6c949c1,
0xc84c00f0, 0xcdcc49cc, 0x883c5cf4, 0x8b0fcb80,
0x703cc0b0, 0xcb820a8d, 0x78804c8c, 0x4fca830e,
0x80d0f03c, 0x8ec84f8c, 0x98c89c4c, 0xc80d878f,
0x54bc949c, 0xc801c5ce, 0x749078dc, 0xc3c80d46,
0x2c8070f0, 0x0cce4dcf, 0x8c3874e4, 0x8d448ac3,
0x987cac70, 0xc0c20ac5, 0x288cfc78, 0xc28543c8,
0x4c8c7434, 0xc50e4f8d, 0x8468f4b4, 0xcb4a0307,
0x2854dc98, 0x48430b45, 0x6858fce8, 0x4681cd49,
0xd04808ec, 0x458d0fcb, 0xe0a48ce4, 0x880f8fce,
0x7434b8fc, 0xce080a8e, 0x5860fc6c, 0x46c886cc,
0xd01098a4, 0xce090b8c, 0x1044cc2c, 0x86898e0f,
0xd0809c3c, 0x4a05860f, 0x54b4f80c, 0x4008870e,
0x1480b88c, 0x0ac8854f, 0x1c9034cc, 0x08444c4e,
0x0cb83c64, 0x41c08cc6, 0x1c083460, 0xc0c603ce,
0x2ca0645c, 0x818246cb, 0x0408e454, 0xc5464487,
0x88607c18, 0xc1424187, 0x284c7c90, 0xc1030509,
0x40486c94, 0x4603494b, 0xe0404ce4, 0x4109094d,
0x60443ce4, 0x4c0b8b8d, 0xe054e8bc, 0x02008e89
};
private static readonly uint[] _lut_a0 = new uint[]
{
0x02080008, 0x02082000, 0x00002008, 0x00000000,
0x02002000, 0x00080008, 0x02080000, 0x02082008,
0x00000008, 0x02000000, 0x00082000, 0x00002008,
0x00082008, 0x02002008, 0x02000008, 0x02080000,
0x00002000, 0x00082008, 0x00080008, 0x02002000,
0x02082008, 0x02000008, 0x00000000, 0x00082000,
0x02000000, 0x00080000, 0x02002008, 0x02080008,
0x00080000, 0x00002000, 0x02082000, 0x00000008,
0x00080000, 0x00002000, 0x02000008, 0x02082008,
0x00002008, 0x02000000, 0x00000000, 0x00082000,
0x02080008, 0x02002008, 0x02002000, 0x00080008,
0x02082000, 0x00000008, 0x00080008, 0x02002000,
0x02082008, 0x00080000, 0x02080000, 0x02000008,
0x00082000, 0x00002008, 0x02002008, 0x02080000,
0x00000008, 0x02082000, 0x00082008, 0x00000000,
0x02000000, 0x02080008, 0x00002000, 0x00082008
};
private static readonly uint[] _lut_a1 = new uint[] {
0x08000004, 0x00020004, 0x00000000, 0x08020200,
0x00020004, 0x00000200, 0x08000204, 0x00020000,
0x00000204, 0x08020204, 0x00020200, 0x08000000,
0x08000200, 0x08000004, 0x08020000, 0x00020204,
0x00020000, 0x08000204, 0x08020004, 0x00000000,
0x00000200, 0x00000004, 0x08020200, 0x08020004,
0x08020204, 0x08020000, 0x08000000, 0x00000204,
0x00000004, 0x00020200, 0x00020204, 0x08000200,
0x00000204, 0x08000000, 0x08000200, 0x00020204,
0x08020200, 0x00020004, 0x00000000, 0x08000200,
0x08000000, 0x00000200, 0x08020004, 0x00020000,
0x00020004, 0x08020204, 0x00020200, 0x00000004,
0x08020204, 0x00020200, 0x00020000, 0x08000204,
0x08000004, 0x08020000, 0x00020204, 0x00000000,
0x00000200, 0x08000004, 0x08000204, 0x08020200,
0x08020000, 0x00000204, 0x00000004, 0x08020004
};
private static readonly uint[] _lut_a2 = new uint[] {
0x80040100, 0x01000100, 0x80000000, 0x81040100,
0x00000000, 0x01040000, 0x81000100, 0x80040000,
0x01040100, 0x81000000, 0x01000000, 0x80000100,
0x81000000, 0x80040100, 0x00040000, 0x01000000,
0x81040000, 0x00040100, 0x00000100, 0x80000000,
0x00040100, 0x81000100, 0x01040000, 0x00000100,
0x80000100, 0x00000000, 0x80040000, 0x01040100,
0x01000100, 0x81040000, 0x81040100, 0x00040000,
0x81040000, 0x80000100, 0x00040000, 0x81000000,
0x00040100, 0x01000100, 0x80000000, 0x01040000,
0x81000100, 0x00000000, 0x00000100, 0x80040000,
0x00000000, 0x81040000, 0x01040100, 0x00000100,
0x01000000, 0x81040100, 0x80040100, 0x00040000,
0x81040100, 0x80000000, 0x01000100, 0x80040100,
0x80040000, 0x00040100, 0x01040000, 0x81000100,
0x80000100, 0x01000000, 0x81000000, 0x01040100
};
private static readonly uint[] _lut_a3 = new uint[] {
0x04010801, 0x00000000, 0x00010800, 0x04010000,
0x04000001, 0x00000801, 0x04000800, 0x00010800,
0x00000800, 0x04010001, 0x00000001, 0x04000800,
0x00010001, 0x04010800, 0x04010000, 0x00000001,
0x00010000, 0x04000801, 0x04010001, 0x00000800,
0x00010801, 0x04000000, 0x00000000, 0x00010001,
0x04000801, 0x00010801, 0x04010800, 0x04000001,
0x04000000, 0x00010000, 0x00000801, 0x04010801,
0x00010001, 0x04010800, 0x04000800, 0x00010801,
0x04010801, 0x00010001, 0x04000001, 0x00000000,
0x04000000, 0x00000801, 0x00010000, 0x04010001,
0x00000800, 0x04000000, 0x00010801, 0x04000801,
0x04010800, 0x00000800, 0x00000000, 0x04000001,
0x00000001, 0x04010801, 0x00010800, 0x04010000,
0x04010001, 0x00010000, 0x00000801, 0x04000800,
0x04000801, 0x00000001, 0x04010000, 0x00010800
};
private static readonly uint[] _lut_b0 = new uint[] {
0x00000400, 0x00000020, 0x00100020, 0x40100000,
0x40100420, 0x40000400, 0x00000420, 0x00000000,
0x00100000, 0x40100020, 0x40000020, 0x00100400,
0x40000000, 0x00100420, 0x00100400, 0x40000020,
0x40100020, 0x00000400, 0x40000400, 0x40100420,
0x00000000, 0x00100020, 0x40100000, 0x00000420,
0x40100400, 0x40000420, 0x00100420, 0x40000000,
0x40000420, 0x40100400, 0x00000020, 0x00100000,
0x40000420, 0x00100400, 0x40100400, 0x40000020,
0x00000400, 0x00000020, 0x00100000, 0x40100400,
0x40100020, 0x40000420, 0x00000420, 0x00000000,
0x00000020, 0x40100000, 0x40000000, 0x00100020,
0x00000000, 0x40100020, 0x00100020, 0x00000420,
0x40000020, 0x00000400, 0x40100420, 0x00100000,
0x00100420, 0x40000000, 0x40000400, 0x40100420,
0x40100000, 0x00100420, 0x00100400, 0x40000400
};
private static readonly uint[] _lut_b1 = new uint[] {
0x00800000, 0x00001000, 0x00000040, 0x00801042,
0x00801002, 0x00800040, 0x00001042, 0x00801000,
0x00001000, 0x00000002, 0x00800002, 0x00001040,
0x00800042, 0x00801002, 0x00801040, 0x00000000,
0x00001040, 0x00800000, 0x00001002, 0x00000042,
0x00800040, 0x00001042, 0x00000000, 0x00800002,
0x00000002, 0x00800042, 0x00801042, 0x00001002,
0x00801000, 0x00000040, 0x00000042, 0x00801040,
0x00801040, 0x00800042, 0x00001002, 0x00801000,
0x00001000, 0x00000002, 0x00800002, 0x00800040,
0x00800000, 0x00001040, 0x00801042, 0x00000000,
0x00001042, 0x00800000, 0x00000040, 0x00001002,
0x00800042, 0x00000040, 0x00000000, 0x00801042,
0x00801002, 0x00801040, 0x00000042, 0x00001000,
0x00001040, 0x00801002, 0x00800040, 0x00000042,
0x00000002, 0x00001042, 0x00801000, 0x00800002
};
private static readonly uint[] _lut_b2 = new uint[] {
0x10400000, 0x00404010, 0x00000010, 0x10400010,
0x10004000, 0x00400000, 0x10400010, 0x00004010,
0x00400010, 0x00004000, 0x00404000, 0x10000000,
0x10404010, 0x10000010, 0x10000000, 0x10404000,
0x00000000, 0x10004000, 0x00404010, 0x00000010,
0x10000010, 0x10404010, 0x00004000, 0x10400000,
0x10404000, 0x00400010, 0x10004010, 0x00404000,
0x00004010, 0x00000000, 0x00400000, 0x10004010,
0x00404010, 0x00000010, 0x10000000, 0x00004000,
0x10000010, 0x10004000, 0x00404000, 0x10400010,
0x00000000, 0x00404010, 0x00004010, 0x10404000,
0x10004000, 0x00400000, 0x10404010, 0x10000000,
0x10004010, 0x10400000, 0x00400000, 0x10404010,
0x00004000, 0x00400010, 0x10400010, 0x00004010,
0x00400010, 0x00000000, 0x10404000, 0x10000010,
0x10400000, 0x10004010, 0x00000010, 0x00404000
};
private static readonly uint[] _lut_b3 = new uint[] {
0x00208080, 0x00008000, 0x20200000, 0x20208080,
0x00200000, 0x20008080, 0x20008000, 0x20200000,
0x20008080, 0x00208080, 0x00208000, 0x20000080,
0x20200080, 0x00200000, 0x00000000, 0x20008000,
0x00008000, 0x20000000, 0x00200080, 0x00008080,
0x20208080, 0x00208000, 0x20000080, 0x00200080,
0x20000000, 0x00000080, 0x00008080, 0x20208000,
0x00000080, 0x20200080, 0x20208000, 0x00000000,
0x00000000, 0x20208080, 0x00200080, 0x20008000,
0x00208080, 0x00008000, 0x20000080, 0x00200080,
0x20208000, 0x00000080, 0x00008080, 0x20200000,
0x20008080, 0x20000000, 0x20200000, 0x00208000,
0x20208080, 0x00008080, 0x00208000, 0x20200080,
0x00200000, 0x20000080, 0x20008000, 0x00000000,
0x00008000, 0x00200000, 0x20200080, 0x00208080,
0x20000000, 0x20208000, 0x00000080, 0x20008080
};
private static readonly string _valid_chars = "0123456789ABCDEFGHJKLMNPRSTUWXYZ";
/// <summary>
/// Given a card id, returns a value indicating the type
/// of eamusement card. (1 = old-style, 2 = FeliCa)
/// </summary>
/// <param name="cardID">
/// 16 digit card ID
/// </param>
/// <returns>
/// An integer value of 1 is returned if the card ID is of an old-style
/// eAmusement card, 2 if the card ID is of the newer FeliCa style
/// eAmusement card; otherwise an exception is thrown.
/// </returns>
/// <exception cref="CardTypeException">
/// Thrown if the card type cannot be deteremined.
/// </exception>
public static int TypeFromCardID(string cardID)
{
// We can determine the card type based on the first two values of the
// card ID.
int cardType = cardID[..2].ToUpper() switch
{
"E0" => 1,
"01" => 2,
_ => throw new Exception("Unknown card type")
};
return cardType;
}
/// <summary>
/// Given a card ID as stored on a card (Usually starting with E004), convert it to the
/// card string as shown on the back of the card.
/// </summary>
/// <param name="cardID">
/// 16 digit card ID (hex values stored as string)
/// </param>
/// <returns>
/// String representation of the card string printed on the back of the
/// eAmusement card.
/// </returns>
public static string Encode(string cardID)
{
// The card ID must be exactly 16 characters to continue.
if (cardID.Length != 16)
{
throw new Exception($"Expected 16-character card length, got {cardID.Length}");
}
byte[] cardint = new byte[8];
int charIndex = 0;
for (int i = 0; i < 8; i++)
{
cardint[i] = (byte)Convert.ToInt32(cardID[(charIndex)..(charIndex + 2)], 16);
charIndex += 2;
}
// Reverse bytes
byte[] reverse = new byte[8];
for (int i = 0; i < 8; i++)
{
reverse[7 - i] = cardint[i];
}
// Encipher
var ciphered = Encode(reverse);
// Convert 8x8 bit bytes into 13 x 5 bit groups (sort of)
int[] bits = new int[65];
for (int i = 0; i < 64; i++)
{
bits[i] = (ciphered[i >> 3] >> (~i & 7)) & 1;
}
int[] groups = new int[16];
for (int i = 0; i < 13; i++)
{
groups[i] = (bits[i * 5 + 0] << 4) |
(bits[i * 5 + 1] << 3) |
(bits[i * 5 + 2] << 2) |
(bits[i * 5 + 3] << 1) |
(bits[i * 5 + 4] << 0);
}
// Smear 13 groups out into 14 groups
groups[13] = 1;
groups[0] ^= TypeFromCardID(cardID);
for (int i = 0; i < 14; i++)
{
int index = i - 1;
index = index < 0 ? groups.Length - 1 : index;
groups[i] ^= groups[index];
}
// Scheme field is 1 for old-style, 2 for felica cards
groups[14] = TypeFromCardID(cardID);
groups[15] = Checksum(groups);
// Convert to chars and return
string result = string.Empty;
for (int i = 0; i < groups.Length; i++)
{
result += _valid_chars[groups[i]];
}
return result;
}
/// <summary>
/// Given a card string as shown on the back of the card, return the card ID
/// as stored on the card itself. Does some sanitization to remove dashes,
/// spaces, and convert confusing characters (1, L and 0, O) before converting.
/// </summary>
/// <param name="cardID">
/// String representation of the card string printed on the back of the
/// eAmusement card.
/// </param>
/// <returns>
/// 16 digit card ID (hex values stored as string)
/// </returns>
public static string Decode(string cardID)
{
// Ensure all characters are uppercase so we can santaize properly.
cardID.ToUpper();
// Remove all spaces from the card id
cardID = cardID.Replace(" ", string.Empty);
// Remve all hyphens from the card id
cardID = cardID.Replace("-", string.Empty);
// Convert all 'I' characters to '1'
cardID = cardID.Replace('I', '1');
// Convert all 'O' characters to '0'
cardID = cardID.Replace('O', '0');
// Card ID must be exactly 16-characters
if (cardID.Length != 16)
{
throw new Exception($"Expected 16-character card ID length, got {cardID.Length}");
}
// Ensure Card ID only contains valid characters
for (int i = 0; i < cardID.Length; i++)
{
if (!_valid_chars.Contains(cardID[i]))
{
throw new Exception($"Got unexpected character {cardID[i]} in card ID");
}
}
// Convert chars to groups
int[] groups = new int[16];
for (int i = 0; i < 16; i++)
{
for (int j = 0; j < 32; j++)
{
if (cardID[i] == _valid_chars[j])
{
groups[i] = j;
break;
}
}
}
// Verify that the card type is 1 (old-style) or 2 (new FeliCa)
if (groups[14] != 1 && groups[14] != 2)
{
throw new Exception($"Unrecognized card type. Expected card type of 1 or 2, got {groups[14]}.");
}
// Verify the checksum
if (groups[15] != Checksum(groups))
{
throw new Exception("Bad card number");
}
// Un-smear 14 fields back into 13
for (int i = 13; i > 0; i--)
{
groups[i] ^= groups[i - 1];
}
groups[0] ^= groups[14];
// Explode groups into bits
int[] bits = new int[64];
for (int i = 0; i < 64; i++)
{
bits[i] = (groups[(i / 5)] >> (4 - (i % 5))) & 1;
}
// Re-pack bits into eight bytes
byte[] ciphered = new byte[8];
for (int i = 0; i < 64; i++)
{
ciphered[(i / 8)] |= Convert.ToByte(bits[i] << (~i & 7));
}
// Decipher and reverse
byte[] deciphered = Decode(ciphered);
byte[] reverse = new byte[8];
for (int i = 0; i < 8; i++)
{
reverse[i] = deciphered[7 - i];
}
// Build the card id by concating the hex value of each byte
// as a string.
string finalValue = string.Empty;
for (int i = 0; i < reverse.Length; i++)
{
finalValue += reverse[i].ToString("X2");
}
// Ensure that the now decoded value has the same matching card type
// as what we had beore.
int cardType = TypeFromCardID(finalValue);
if (groups[14] != cardType)
{
throw new Exception("Mismatched card type after decoding.");
}
return finalValue;
}
private static int Checksum(int[] data)
{
int checksum = 0;
for (int i = 0; i < 15; i++)
{
checksum += (i % 3 + 1) * data[i];
}
while (checksum >= 0x20)
{
checksum = (checksum & 0x1F) + (checksum >> 5);
}
return checksum;
}
private static byte[] Encode(byte[] input)
{
if (input.Length != 8)
{
throw new Exception($"Expected 8-byte input, got {input.Length}");
}
//// Make a copy of the input data and work with the copy to ensure
//// no values are changed from the input byte array.
//byte[] input = new byte[inBytes.Length];
//Buffer.BlockCopy(inBytes, 0, input, 0, inBytes.Length);
byte[] output = new byte[8];
FromInt(output, OperatorA(0x00, ToInt(input)));
FromInt(output, OperatorB(0x20, ToInt(output)));
FromInt(output, OperatorA(0x40, ToInt(output)));
return output;
}
private static byte[] Decode(byte[] input)
{
if (input.Length != 8)
{
throw new Exception($"Expected 8-byte input, got {input.Length}");
}
//byte[] inp = new byte[input.Length];
//Buffer.BlockCopy(input, 0, inp, 0, input.Length);
byte[] output = new byte[8];
FromInt(output, OperatorB(0x40, ToInt(input)));
FromInt(output, OperatorA(0x20, ToInt(output)));
FromInt(output, OperatorB(0x00, ToInt(output)));
return output;
}
private static long ToInt(byte[] data)
{
var inX = (data[0] & 0xFF) |
((data[1] & 0xFF) << 8) |
((data[2] & 0xFF) << 16) |
((data[3] & 0xFF) << 24);
var inY = (data[4] & 0xFF) |
((data[5] & 0xFF) << 8) |
((data[6] & 0xFF) << 16) |
((data[7] & 0xFF) << 24);
var v7 = ((((inX ^ (inY >> 4)) & 0xF0F0F0F) << 4) ^ inY) & 0xFFFFFFFF;
var v8 = (((inX ^ (inY >> 4)) & 0xF0F0F0F) ^ inX) & 0xFFFFFFFF;
var v9 = ((v7 ^ (v8 >> 16))) & 0x0000FFFF;
var v10 = (((v7 ^ (v8 >> 16)) << 16) ^ v8) & 0xFFFFFFFF;
var v11 = (v9 ^ v7) & 0xFFFFFFFF;
var v12 = (v10 ^ (v11 >> 2)) & 0x33333333;
var v13 = (v11 ^ (v12 << 2)) & 0xFFFFFFFF;
var v14 = (v12 ^ v10) & 0xFFFFFFFF;
var v15 = (v13 ^ (v14 >> 8)) & 0x00FF00FF;
var v16 = (v14 ^ (v15 << 8)) & 0xFFFFFFFF;
var v17 = ROR(v15 ^ v13, 1);
var v18 = (v16 ^ v17) & 0x55555555;
var v3 = ROR(v18 ^ v16, 1);
var v4 = (v18 ^ v17) & 0xFFFFFFFF;
var result = ((v3 & 0xFFFFFFFF) << 32) | (v4 & 0xFFFFFFFF);
return result;
}
private static void FromInt(byte[] data, long state)
{
long v3 = (state >> 32) & 0xFFFFFFFF;
long v4 = state & 0xFFFFFFFF;
long v22 = ROR(v4, 31);
long v23 = (v3 ^ v22) & 0x55555555;
long v24 = (v23 ^ v22) & 0xFFFFFFFF;
long v25 = ROR(v23 ^ v3, 31);
long v26 = (v25 ^ (v24 >> 8)) & 0x00FF00FF;
long v27 = (v24 ^ (v26 << 8)) & 0xFFFFFFFF;
long v28 = (v26 ^ v25) & 0xFFFFFFFF;
long v29 = ((v28 >> 2) ^ v27) & 0x33333333;
long v30 = ((v29 << 2) ^ v28) & 0xFFFFFFFF;
long v31 = (v29 ^ v27) & 0xFFFFFFFF;
long v32 = (v30 ^ (v31 >> 16)) & 0x0000FFFF;
long v33 = (v31 ^ (v32 << 16)) & 0xFFFFFFFF;
long v34 = (v32 ^ v30) & 0xFFFFFFFF;
long v35 = (v33 ^ (v34 >> 4)) & 0xF0F0F0F;
long outY = ((v35 << 4) ^ v34) & 0xFFFFFFFF;
long outX = (v35 ^ v33) & 0xFFFFFFFF;
data[0] = Convert.ToByte(outX & 0xFF);
data[1] = Convert.ToByte((outX >> 8) & 0xFF);
data[2] = Convert.ToByte((outX >> 16) & 0xFF);
data[3] = Convert.ToByte((outX >> 24) & 0xFF);
data[4] = Convert.ToByte(outY & 0xFF);
data[5] = Convert.ToByte((outY >> 8) & 0xFF);
data[6] = Convert.ToByte((outY >> 16) & 0xFF);
data[7] = Convert.ToByte((outY >> 24) & 0xFF);
}
private static long OperatorA(int off, long state)
{
var v3 = (state >> 32) & 0xFFFFFFFF;
var v4 = state & 0xFFFFFFFF;
for (int i = 0; i < 32; i += 4)
{
var v20 = ROR(v3 ^ _key[off + i + 1], 28);
v4 ^= _lut_b0[(v20 >> 26) & 0x3F] ^
_lut_b1[(v20 >> 18) & 0x3F] ^
_lut_b2[(v20 >> 10) & 0x3F] ^
_lut_b3[(v20 >> 2) & 0x3F] ^
_lut_a0[((v3 ^ _key[off + i]) >> 26) & 0x3F] ^
_lut_a1[((v3 ^ _key[off + i]) >> 18) & 0x3F] ^
_lut_a2[((v3 ^ _key[off + i]) >> 10) & 0x3F] ^
_lut_a3[((v3 ^ _key[off + i]) >> 2) & 0x3F];
var v21 = ROR(v4 ^ _key[off + i + 3], 28);
v3 ^= _lut_b0[(v21 >> 26) & 0x3F] ^
_lut_b1[(v21 >> 18) & 0x3F] ^
_lut_b2[(v21 >> 10) & 0x3F] ^
_lut_b3[(v21 >> 2) & 0x3F] ^
_lut_a0[((v4 ^ _key[off + i + 2]) >> 26) & 0x3F] ^
_lut_a1[((v4 ^ _key[off + i + 2]) >> 18) & 0x3F] ^
_lut_a2[((v4 ^ _key[off + i + 2]) >> 10) & 0x3F] ^
_lut_a3[((v4 ^ _key[off + i + 2]) >> 2) & 0x3F];
}
var result = ((v3 & 0xFFFFFFFF) << 32) | (v4 & 0xFFFFFFFF);
return result;
}
private static long OperatorB(int off, long state)
{
var v3 = (state >> 32) & 0xFFFFFFFF;
var v4 = state & 0xFFFFFFFF;
for (int i = 0; i < 32; i += 4)
{
var v20 = ROR(v3 ^ _key[off + 31 - i], 28);
v4 ^= _lut_a0[((v3 ^ _key[off + 30 - i]) >> 26) & 0x3F] ^
_lut_a1[((v3 ^ _key[off + 30 - i]) >> 18) & 0x3F] ^
_lut_a2[((v3 ^ _key[off + 30 - i]) >> 10) & 0x3F] ^
_lut_a3[((v3 ^ _key[off + 30 - i]) >> 2) & 0x3F] ^
_lut_b0[(v20 >> 26) & 0x3F] ^
_lut_b1[(v20 >> 18) & 0x3F] ^
_lut_b2[(v20 >> 10) & 0x3F] ^
_lut_b3[(v20 >> 2) & 0x3F];
var v21 = ROR(v4 ^ _key[off + 29 - i], 28);
v3 ^= _lut_a0[((v4 ^ _key[off + 28 - i]) >> 26) & 0x3F] ^
_lut_a1[((v4 ^ _key[off + 28 - i]) >> 18) & 0x3F] ^
_lut_a2[((v4 ^ _key[off + 28 - i]) >> 10) & 0x3F] ^
_lut_a3[((v4 ^ _key[off + 28 - i]) >> 2) & 0x3F] ^
_lut_b0[(v21 >> 26) & 0x3F] ^
_lut_b1[(v21 >> 18) & 0x3F] ^
_lut_b2[(v21 >> 10) & 0x3F] ^
_lut_b3[(v21 >> 2) & 0x3F];
}
return ((v3 & 0xFFFFFFFF) << 32) | (v4 & 0xFFFFFFFF);
}
private static long ROR(long val, int amount)
{
return ((val << (32 - amount)) & 0xFFFFFFFF) | ((val >> amount) & 0xFFFFFFFF);
}
}
}

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EamuseCardConvert/EamuseCardConvert.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>netcoreapp3</TargetFramework>
</PropertyGroup>
</Project>

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using System;
namespace EamuseCardConvert
{
class Program
{
static void Main(string[] args)
{
if (args.Length == 0)
{
Console.WriteLine("Eamusement Card Convert");
Console.WriteLine("A utility to convert between card IDs and back-of-card characters.");
Console.WriteLine();
Console.WriteLine("Usage: eamusecardconvert <card-id> ");
Console.WriteLine();
Console.WriteLine("Options: ");
Console.WriteLine(" <card-id>: 16-character card ID as stored in an eAmusement card, or");
Console.WriteLine(" the 16-character card number as shown on the back of the");
Console.WriteLine(" e-Amusement card. Whichever value is supplied, the result");
Console.WriteLine(" given is the conversion to the other.");
}
else
{
// Get the number that we'll be converting.
string number = args[0];
// If the user supplied the number with spaces between the characters
// and did not surround the entire thing in quotes, then we'll have more
// than one arg. In this case, just join it all together into one string.
if (args.Length > 1)
{
number = string.Join("", args);
}
try
{
Console.WriteLine(CardCipher.Decode(number));
}
catch
{
try
{
string back = CardCipher.Encode(number);
for (int i = 4; i < back.Length; i += 4)
{
back = back.Insert(i, " ");
i++;
}
Console.WriteLine(back);
}
catch
{
Console.WriteLine("Bad card ID or back-of-card characters");
}
}
}
}
}
}

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README.md Normal file
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# e-Amusement Card Convert
A command-line utility for converting between card numbers written on the back of an e-Amusement card and the card ID stored in the RFID on the card.
This utility is a port of the [card convert](https://github.com/DragonMinded/bemaniutils/blob/master/bemani/common/card.py) utility originally written in python by [@DragonMinded](https://github.com/DragonMinded).
# Usage
Run it like `./eamusecardconvert <card-id>`. `<card-id>` can be either the 16-character card ID stored in the RFID on the e-Amusement card, or the 16-character card number as shown on the back of the e-Amusement card. Whichever value is supplied, the resulting output will be the conversion to the other. Inputs will be sanitized, so you can feed card ID and back-of-card numbers with or without spaces, with or without hyphens, and you can also mix up `1` and `I` as well as `O` and `0`. Both old-style and newer FeliCa style e-Amusement cards are supported.