Nero's MMD World VIP and 18+ Code

[RedCob]

I'm suspecting that they're using a nonstandard SHA256-UTF8 implementation. @Lucian Is there a way for you to obtain the Udon implementation of the hashing algorithm?

[Worcestershire]

@RedCob If my reading of the code @Lucian pasted here is correct they're using the vrchat-udon-hashlib. Both call the lib using "_hashLibrary".

Here's the code of the hashing it uses if it's of any help:

// -*- coding: utf-8 -*-
/*
MIT License

Copyright (c) 2021-present Devon (Gorialis) R

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

*/

using System;
using System.Linq;
using UnityEngine;
using UdonSharp;

#if !COMPILER_UDONSHARP && UNITY_EDITOR
using UnityEditor;
using UdonSharpEditor;
#endif


public class UdonHashLib : UdonSharpBehaviour
{
    // Udon does not support UTF-8 or expose System.Text.Encoding so we must implement this ourselves
    private byte[] ToUTF8(char[] characters)
    {
        byte[] buffer = new byte[characters.Length * 4];

        int writeIndex = 0;
        for (int i = 0; i < characters.Length; i++)
        {
            uint character = characters[i];

            if (character < 0x80)
            {
                buffer[writeIndex++] = (byte)character;
            } else if (character < 0x800)
            {
                buffer[writeIndex++] = (byte)(0b11000000 | ((character >> 6) & 0b11111));
                buffer[writeIndex++] = (byte)(0b10000000 | (character & 0b111111));
            } else if (character < 0x10000)
            {
                buffer[writeIndex++] = (byte)(0b11100000 | ((character >> 12) & 0b1111));
                buffer[writeIndex++] = (byte)(0b10000000 | ((character >> 6) & 0b111111));
                buffer[writeIndex++] = (byte)(0b10000000 | (character & 0b111111));
            } else
            {
                buffer[writeIndex++] = (byte)(0b11110000 | ((character >> 18) & 0b111));
                buffer[writeIndex++] = (byte)(0b10000000 | ((character >> 12) & 0b111111));
                buffer[writeIndex++] = (byte)(0b10000000 | ((character >> 6) & 0b111111));
                buffer[writeIndex++] = (byte)(0b10000000 | (character & 0b111111));
            }
        }

        // We do this to truncate off the end of the array
        // This would be a lot easier with Array.Resize, but Udon once again does not allow access to it.
        byte[] output = new byte[writeIndex];

        for (int i = 0; i < writeIndex; i++)
            output[i] = buffer[i];

        return output;
    }

    /*  MD5  */

    private readonly ulong[] md5_init =
    {
        0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476,
    };

    private readonly ulong[] md5_constants = {
        0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
        0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
        0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
        0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
        0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
        0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
        0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
        0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
    };

    private readonly int[] md5_shifts =
    {
        7, 12, 17, 22,  7, 12, 17, 22,  7, 12, 17, 22,  7, 12, 17, 22,
        5,  9, 14, 20,  5,  9, 14, 20,  5,  9, 14, 20,  5,  9, 14, 20,
        4, 11, 16, 23,  4, 11, 16, 23,  4, 11, 16, 23,  4, 11, 16, 23,
        6, 10, 15, 21,  6, 10, 15, 21,  6, 10, 15, 21,  6, 10, 15, 21,
    };

    private string MD5_Core(byte[] payload_bytes, ulong[] init, ulong[] constants, int[] shifts, ulong size_mask, int word_size, int chunk_modulo, int appended_length, int round_count, string output_format, int output_segments)
    {
        int word_bytes = word_size / 8;

        // Working variables a0->d0
        ulong[] working_variables = new ulong[4];
        init.CopyTo(working_variables, 0);

        byte[] input = new byte[chunk_modulo];
        ulong[] message_schedule = new ulong[16];

        // Each 64-byte/512-bit chunk
        // 64 bits/8 bytes are required at the end for the bit size
        for (int chunk_index = 0; chunk_index < payload_bytes.Length + appended_length + 1; chunk_index += chunk_modulo)
        {
            int chunk_size = Mathf.Min(chunk_modulo, payload_bytes.Length - chunk_index);
            int schedule_index = 0;

            // Buffer message
            for (; schedule_index < chunk_size; ++schedule_index)
                input[schedule_index] = payload_bytes[chunk_index + schedule_index];
            // Append a 1-bit if not an even chunk
            if (schedule_index < chunk_modulo && chunk_size >= 0)
                input[schedule_index++] = 0b10000000;
            // Pad with zeros until the end
            for (; schedule_index < chunk_modulo; ++schedule_index)
                input[schedule_index] = 0x00;
            // If the chunk is less than 56 bytes, this will be the final chunk containing the data size in bits
            if (chunk_size < chunk_modulo - appended_length)
            {
                ulong bit_size = (ulong)payload_bytes.Length * 8ul;
                input[chunk_modulo - 8] = Convert.ToByte((bit_size >> 0x00) & 0xFFul);
                input[chunk_modulo - 7] = Convert.ToByte((bit_size >> 0x08) & 0xFFul);
                input[chunk_modulo - 6] = Convert.ToByte((bit_size >> 0x10) & 0xFFul);
                input[chunk_modulo - 5] = Convert.ToByte((bit_size >> 0x18) & 0xFFul);
                input[chunk_modulo - 4] = Convert.ToByte((bit_size >> 0x20) & 0xFFul);
                input[chunk_modulo - 3] = Convert.ToByte((bit_size >> 0x28) & 0xFFul);
                input[chunk_modulo - 2] = Convert.ToByte((bit_size >> 0x30) & 0xFFul);
                input[chunk_modulo - 1] = Convert.ToByte((bit_size >> 0x38) & 0xFFul);
            }

            // Copy into w[0..15]
            int copy_index = 0;
            for (; copy_index < 16; copy_index++)
            {
                message_schedule[copy_index] = 0ul;
                for (int i = 0; i < word_bytes; i++)
                {
                    message_schedule[copy_index] = message_schedule[copy_index] | ((ulong)input[(copy_index * word_bytes) + i] << (i * 8));
                }

                message_schedule[copy_index] = message_schedule[copy_index] & size_mask;
            }

            // temp vars
            ulong f, g;
            // work is equivalent to A, B, C, D
            // This copies work from a0, b0, c0, d0
            ulong[] work = new ulong[4];
            working_variables.CopyTo(work, 0);

            // Compression function main loop
            for (copy_index = 0; copy_index < round_count; copy_index++)
            {
                if (copy_index < 16)
                {
                    f = ((work[1] & work[2]) | ((size_mask ^ work[1]) & work[3])) & size_mask;
                    g = (ulong)copy_index;
                } else if (copy_index < 32)
                {
                    f = ((work[3] & work[1]) | ((size_mask ^ work[3]) & work[2])) & size_mask;
                    g = (ulong)(((5 * copy_index) + 1) % 16);
                } else if (copy_index < 48)
                {
                    f = work[1] ^ work[2] ^ work[3];
                    g = (ulong)(((3 * copy_index) + 5) % 16);
                } else
                {
                    f = (work[2] ^ (work[1] | (size_mask ^ work[3]))) & size_mask;
                    g = (ulong)(7 * copy_index % 16);
                }

                f = (f + work[0] + constants[copy_index] + message_schedule[g]) & size_mask;
                work[0] = work[3];
                work[3] = work[2];
                work[2] = work[1];
                work[1] = (work[1] + ((f << shifts[copy_index]) | (f >> word_size - shifts[copy_index]))) & size_mask;
            }

            for (copy_index = 0; copy_index < 4; copy_index++)
                working_variables[copy_index] = (working_variables[copy_index] + work[copy_index]) & size_mask;
        }

        // Finalization
        string output = "";

        for (int character_index = 0; character_index < output_segments; character_index++)
        {
            ulong value = working_variables[character_index];
            output += string.Format(output_format,
                ((value & 0x000000FFul) << 0x18) |
                ((value & 0x0000FF00ul) << 0x08) |
                ((value & 0x00FF0000ul) >> 0x08) |
                ((value & 0xFF000000ul) >> 0x18)
            );
        }

        return output;
    }

    public string MD5_Bytes(byte[] data)
    {
        return MD5_Core(data, md5_init, md5_constants, md5_shifts, 0xFFFFFFFFul, 32, 64, 8, 64, "{0:x8}", 4);
    }

    public string MD5_UTF8(string text)
    {
        return MD5_Core(ToUTF8(text.ToCharArray()), md5_init, md5_constants, md5_shifts, 0xFFFFFFFFul, 32, 64, 8, 64, "{0:x8}", 4);
    }

    /*  SHA1  */

    private readonly ulong[] sha1_init = {
        0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0,
    };

    private string SHA1_Core(byte[] payload_bytes, ulong[] init, ulong size_mask, int word_size, int chunk_modulo, int appended_length, int left_rotations, int round_count, string output_format, int output_segments)
    {
        int word_bytes = word_size / 8;

        // Working variables h0->h4
        ulong[] working_variables = new ulong[5];
        init.CopyTo(working_variables, 0);

        byte[] input = new byte[chunk_modulo];
        ulong[] message_schedule = new ulong[round_count];

        // Each 64-byte/512-bit chunk
        // 64 bits/8 bytes are required at the end for the bit size
        for (int chunk_index = 0; chunk_index < payload_bytes.Length + appended_length + 1; chunk_index += chunk_modulo)
        {
            int chunk_size = Mathf.Min(chunk_modulo, payload_bytes.Length - chunk_index);
            int schedule_index = 0;

            // Buffer message
            for (; schedule_index < chunk_size; ++schedule_index)
                input[schedule_index] = payload_bytes[chunk_index + schedule_index];
            // Append a 1-bit if not an even chunk
            if (schedule_index < chunk_modulo && chunk_size >= 0)
                input[schedule_index++] = 0b10000000;
            // Pad with zeros until the end
            for (; schedule_index < chunk_modulo; ++schedule_index)
                input[schedule_index] = 0x00;
            // If the chunk is less than 56 bytes, this will be the final chunk containing the data size in bits
            if (chunk_size < chunk_modulo - appended_length)
            {
                ulong bit_size = (ulong)payload_bytes.Length * 8ul;
                input[chunk_modulo - 1] = Convert.ToByte((bit_size >> 0x00) & 0xFFul);
                input[chunk_modulo - 2] = Convert.ToByte((bit_size >> 0x08) & 0xFFul);
                input[chunk_modulo - 3] = Convert.ToByte((bit_size >> 0x10) & 0xFFul);
                input[chunk_modulo - 4] = Convert.ToByte((bit_size >> 0x18) & 0xFFul);
                input[chunk_modulo - 5] = Convert.ToByte((bit_size >> 0x20) & 0xFFul);
                input[chunk_modulo - 6] = Convert.ToByte((bit_size >> 0x28) & 0xFFul);
                input[chunk_modulo - 7] = Convert.ToByte((bit_size >> 0x30) & 0xFFul);
                input[chunk_modulo - 8] = Convert.ToByte((bit_size >> 0x38) & 0xFFul);
            }

            // Copy into w[0..15]
            int copy_index = 0;
            for (; copy_index < 16; copy_index++)
            {
                message_schedule[copy_index] = 0ul;
                for (int i = 0; i < word_bytes; i++)
                {
                    message_schedule[copy_index] = (message_schedule[copy_index] << 8) | input[(copy_index * word_bytes) + i];
                }

                message_schedule[copy_index] = message_schedule[copy_index] & size_mask;
            }
            // Extend
            for (; copy_index < round_count; copy_index++)
            {
                ulong w = message_schedule[copy_index - 3] ^ message_schedule[copy_index - 8] ^ message_schedule[copy_index - 14] ^ message_schedule[copy_index - 16];
                message_schedule[copy_index] = (
                    (w << left_rotations) | (w >> word_size - left_rotations)
                ) & size_mask;
            }

            // temp vars
            ulong temp, k, f;
            // work is equivalent to a, b, c, d, e
            // This copies work from h0, h1, h2, h3, h4
            ulong[] work = new ulong[5];
            working_variables.CopyTo(work, 0);

            // Compression function main loop
            for (copy_index = 0; copy_index < round_count; copy_index++)
            {
                if (copy_index < 20)
                {
                    f = ((work[1] & work[2]) | ((size_mask ^ work[1]) & work[3])) & size_mask;
                    k = 0x5A827999;
                } else if (copy_index < 40)
                {
                    f = work[1] ^ work[2] ^ work[3];
                    k = 0x6ED9EBA1;
                } else if (copy_index < 60)
                {
                    f = (work[1] & work[2]) ^ (work[1] & work[3]) ^ (work[2] & work[3]);
                    k = 0x8F1BBCDC;
                } else
                {
                    f = work[1] ^ work[2] ^ work[3];
                    k = 0xCA62C1D6;
                }

                temp = (((work[0] << 5) | (work[0] >> word_size - 5)) + f + work[4] + k + message_schedule[copy_index]) & size_mask;
                work[4] = work[3];
                work[3] = work[2];
                work[2] = ((work[1] << 30) | (work[1] >> word_size - 30)) & size_mask;
                work[1] = work[0];
                work[0] = temp;
            }

            for (copy_index = 0; copy_index < 5; copy_index++)
                working_variables[copy_index] = (working_variables[copy_index] + work[copy_index]) & size_mask;
        }

        // Finalization
        string output = "";

        for (int character_index = 0; character_index < output_segments; character_index++)
        {
            output += string.Format(output_format, working_variables[character_index]);
        }

        return output;
    }

    /* SHA0 */
    /* This algorithm has had documented vulnerabilites since before its formal release. */
    /* Near to nothing uses it, and it should not be trusted for real applications under any circumstances */
    /* It is only here for completeness, and there may be bugs with it due to the difficulty of finding RFC-complying implementations to test against. */
    /*
    public string SHA0_Bytes(byte[] data)
    {
        return SHA1_Core(data, sha1_init, 0xFFFFFFFFul, 32, 64, 8, 0, 80, "{0:x8}", 5);
    }

    public string SHA0_UTF8(string text)
    {
        return SHA1_Core(ToUTF8(text.ToCharArray()), sha1_init, 0xFFFFFFFFul, 32, 64, 8, 0, 80, "{0:x8}", 5);
    }
    */

    /* SHA1 */
    public string SHA1_Bytes(byte[] data)
    {
        return SHA1_Core(data, sha1_init, 0xFFFFFFFFul, 32, 64, 8, 1, 80, "{0:x8}", 5);
    }

    public string SHA1_UTF8(string text)
    {
        return SHA1_Core(ToUTF8(text.ToCharArray()), sha1_init, 0xFFFFFFFFul, 32, 64, 8, 1, 80, "{0:x8}", 5);
    }

    /*  SHA2  */

    private readonly ulong[] sha224_init = {
        0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939, 0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4,
    };

    private readonly ulong[] sha256_init = {
        0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19,
    };

    private readonly ulong[] sha256_constants = {
        0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
        0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
        0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
        0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
        0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
        0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
        0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
        0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
    };

    private readonly int[] sha256_sums =
    {
        7, 18, 3,  // s0
        17, 19, 10,  // s1
    };

    private readonly int[] sha256_sigmas =
    {
        2, 13, 22,  // S0
        6, 11, 25,  // S1
    };

    private readonly ulong[] sha384_init = {
        0xcbbb9d5dc1059ed8, 0x629a292a367cd507, 0x9159015a3070dd17, 0x152fecd8f70e5939, 0x67332667ffc00b31,
        0x8eb44a8768581511, 0xdb0c2e0d64f98fa7, 0x47b5481dbefa4fa4,
    };

    private readonly ulong[] sha512_init = {
        0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1, 0x510e527fade682d1,
        0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179,
    };

    private readonly ulong[] sha512_constants = {
        0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc, 0x3956c25bf348b538,
        0x59f111f1b605d019, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118, 0xd807aa98a3030242, 0x12835b0145706fbe,
        0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2, 0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235,
        0xc19bf174cf692694, 0xe49b69c19ef14ad2, 0xefbe4786384f25e3, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65,
        0x2de92c6f592b0275, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5, 0x983e5152ee66dfab,
        0xa831c66d2db43210, 0xb00327c898fb213f, 0xbf597fc7beef0ee4, 0xc6e00bf33da88fc2, 0xd5a79147930aa725,
        0x06ca6351e003826f, 0x142929670a0e6e70, 0x27b70a8546d22ffc, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed,
        0x53380d139d95b3df, 0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6, 0x92722c851482353b,
        0xa2bfe8a14cf10364, 0xa81a664bbc423001, 0xc24b8b70d0f89791, 0xc76c51a30654be30, 0xd192e819d6ef5218,
        0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8, 0x19a4c116b8d2d0c8, 0x1e376c085141ab53,
        0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8, 0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb, 0x5b9cca4f7763e373,
        0x682e6ff3d6b2b8a3, 0x748f82ee5defb2fc, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec,
        0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915, 0xc67178f2e372532b, 0xca273eceea26619c,
        0xd186b8c721c0c207, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178, 0x06f067aa72176fba, 0x0a637dc5a2c898a6,
        0x113f9804bef90dae, 0x1b710b35131c471b, 0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc,
        0x431d67c49c100d4c, 0x4cc5d4becb3e42b6, 0x597f299cfc657e2a, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817,
    };

    private readonly int[] sha512_sums =
    {
        1, 8, 7,  // s0
        19, 61, 6,  // s1
    };

    private readonly int[] sha512_sigmas =
    {
        28, 34, 39,  // S0
        14, 18, 41,  // S1
    };

    private string SHA2_Core(byte[] payload_bytes, ulong[] init, ulong[] constants, int[] sums, int[] sigmas, ulong size_mask, int word_size, int chunk_modulo, int appended_length, int round_count, string output_format, int output_segments)
    {
        int word_bytes = word_size / 8;

        // Working variables h0->h7
        ulong[] working_variables = new ulong[8];
        init.CopyTo(working_variables, 0);

        byte[] input = new byte[chunk_modulo];
        ulong[] message_schedule = new ulong[round_count];

        // Each 64-byte/512-bit chunk
        // 64 bits/8 bytes are required at the end for the bit size
        for (int chunk_index = 0; chunk_index < payload_bytes.Length + appended_length + 1; chunk_index += chunk_modulo) {
            int chunk_size = Mathf.Min(chunk_modulo, payload_bytes.Length - chunk_index);
            int schedule_index = 0;

            // Buffer message
            for (; schedule_index < chunk_size; ++schedule_index)
                input[schedule_index] = payload_bytes[chunk_index + schedule_index];
            // Append a 1-bit if not an even chunk
            if (schedule_index < chunk_modulo && chunk_size >= 0)
                input[schedule_index++] = 0b10000000;
            // Pad with zeros until the end
            for (; schedule_index < chunk_modulo; ++schedule_index)
                input[schedule_index] = 0x00;
            // If the chunk is less than 56 bytes, this will be the final chunk containing the data size in bits
            if (chunk_size < chunk_modulo - appended_length) {
                ulong bit_size = (ulong)payload_bytes.Length * 8ul;
                input[chunk_modulo - 1] = Convert.ToByte((bit_size >> 0x00) & 0xFFul);
                input[chunk_modulo - 2] = Convert.ToByte((bit_size >> 0x08) & 0xFFul);
                input[chunk_modulo - 3] = Convert.ToByte((bit_size >> 0x10) & 0xFFul);
                input[chunk_modulo - 4] = Convert.ToByte((bit_size >> 0x18) & 0xFFul);
                input[chunk_modulo - 5] = Convert.ToByte((bit_size >> 0x20) & 0xFFul);
                input[chunk_modulo - 6] = Convert.ToByte((bit_size >> 0x28) & 0xFFul);
                input[chunk_modulo - 7] = Convert.ToByte((bit_size >> 0x30) & 0xFFul);
                input[chunk_modulo - 8] = Convert.ToByte((bit_size >> 0x38) & 0xFFul);
            }

            // Copy into w[0..15]
            int copy_index = 0;
            for (; copy_index < 16; copy_index++)
            {
                message_schedule[copy_index] = 0ul;
                for (int i = 0; i < word_bytes; i++)
                {
                    message_schedule[copy_index] = (message_schedule[copy_index] << 8) | input[(copy_index * word_bytes) + i];
                }

                message_schedule[copy_index] = message_schedule[copy_index] & size_mask;
            }
            // Extend
            for(; copy_index < round_count; copy_index++) {
                ulong s0_read = message_schedule[copy_index - 15];
                ulong s1_read = message_schedule[copy_index - 2];

                message_schedule[copy_index] = (
                    message_schedule[copy_index - 16] +
                    (((s0_read >> sums[0]) | (s0_read << word_size - sums[0])) ^ ((s0_read >> sums[1]) | (s0_read << word_size - sums[1])) ^ (s0_read >> sums[2])) + // s0
                    message_schedule[copy_index - 7] +
                    (((s1_read >> sums[3]) | (s1_read << word_size - sums[3])) ^ ((s1_read >> sums[4]) | (s1_read << word_size - sums[4])) ^ (s1_read >> sums[5])) // s1
                ) & size_mask;
            }

            // temp vars
            ulong temp1, temp2;
            // work is equivalent to a, b, c, d, e, f, g, h
            // This copies work from h0, h1, h2, h3, h4, h5, h6, h7
            ulong[] work = new ulong[8];
            working_variables.CopyTo(work, 0);

            // Compression function main loop
            for (copy_index = 0; copy_index < round_count; copy_index++)
            {
                ulong ep1 = ((work[4] >> sigmas[3]) | (work[4] << word_size - sigmas[3])) ^ ((work[4] >> sigmas[4]) | (work[4] << word_size - sigmas[4])) ^ ((work[4] >> sigmas[5]) | (work[4] << word_size - sigmas[5]));
                ulong ch = (work[4] & work[5]) ^ ((size_mask ^ work[4]) & work[6]);
                ulong ep0 = ((work[0] >> sigmas[0]) | (work[0] << word_size - sigmas[0])) ^ ((work[0] >> sigmas[1]) | (work[0] << word_size - sigmas[1])) ^ ((work[0] >> sigmas[2]) | (work[0] << word_size - sigmas[2]));
                ulong maj = (work[0] & work[1]) ^ (work[0] & work[2]) ^ (work[1] & work[2]);
                temp1 = work[7] + ep1 + ch + constants[copy_index] + message_schedule[copy_index];
                temp2 = ep0 + maj;
                work[7] = work[6];
                work[6] = work[5];
                work[5] = work[4];
                work[4] = (work[3] + temp1) & size_mask;
                work[3] = work[2];
                work[2] = work[1];
                work[1] = work[0];
                work[0] = (temp1 + temp2) & size_mask;
            }

            for (copy_index = 0; copy_index < 8; copy_index++)
                working_variables[copy_index] = (working_variables[copy_index] + work[copy_index]) & size_mask;
        }

        // Finalization
        string output = "";

        for (int character_index = 0; character_index < output_segments; character_index++) {
            output += string.Format(output_format, working_variables[character_index]);
        }

        return output;
    }

    /* SHA224 */
    public string SHA224_Bytes(byte[] data)
    {
        return SHA2_Core(data, sha224_init, sha256_constants, sha256_sums, sha256_sigmas, 0xFFFFFFFFul, 32, 64, 8, 64, "{0:x8}", 7);
    }

    public string SHA224_UTF8(string text)
    {
        return SHA2_Core(ToUTF8(text.ToCharArray()), sha224_init, sha256_constants, sha256_sums, sha256_sigmas, 0xFFFFFFFFul, 32, 64, 8, 64, "{0:x8}", 7);
    }

    /* SHA256 */
    public string SHA256_Bytes(byte[] data)
    {
        return SHA2_Core(data, sha256_init, sha256_constants, sha256_sums, sha256_sigmas, 0xFFFFFFFFul, 32, 64, 8, 64, "{0:x8}", 8);
    }

    public string SHA256_UTF8(string text)
    {
        return SHA2_Core(ToUTF8(text.ToCharArray()), sha256_init, sha256_constants, sha256_sums, sha256_sigmas, 0xFFFFFFFFul, 32, 64, 8, 64, "{0:x8}", 8);
    }

    /* SHA384 */
    public string SHA384_Bytes(byte[] data)
    {
        return SHA2_Core(data, sha384_init, sha512_constants, sha512_sums, sha512_sigmas, 0xFFFFFFFFFFFFFFFFul, 64, 128, 16, 80, "{0:x16}", 6);
    }

    public string SHA384_UTF8(string text)
    {
        return SHA2_Core(ToUTF8(text.ToCharArray()), sha384_init, sha512_constants, sha512_sums, sha512_sigmas, 0xFFFFFFFFFFFFFFFFul, 64, 128, 16, 80, "{0:x16}", 6);
    }

    /* SHA512 */
    public string SHA512_Bytes(byte[] data)
    {
        return SHA2_Core(data, sha512_init, sha512_constants, sha512_sums, sha512_sigmas, 0xFFFFFFFFFFFFFFFFul, 64, 128, 16, 80, "{0:x16}", 8);
    }

    public string SHA512_UTF8(string text)
    {
        return SHA2_Core(ToUTF8(text.ToCharArray()), sha512_init, sha512_constants, sha512_sums, sha512_sigmas, 0xFFFFFFFFFFFFFFFFul, 64, 128, 16, 80, "{0:x16}", 8);
    }
}


#if !COMPILER_UDONSHARP && UNITY_EDITOR

[CustomEditor(typeof(UdonHashLib))]
public class UdonHashLibEditor : Editor
{
    private string inputString = "";

    public override void OnInspectorGUI()
    {
        // Draws the default convert to UdonBehaviour button, program asset field, sync settings, etc.
        if (UdonSharpGUI.DrawDefaultUdonSharpBehaviourHeader(target)) return;

        UdonHashLib inspectorBehaviour = (UdonHashLib)target;

        if (!EditorApplication.isPlaying)
            EditorGUILayout.HelpBox("Enter play mode to run tests", MessageType.Info);

        EditorGUI.BeginDisabledGroup(!EditorApplication.isPlaying);

        // A simple string field modification with Undo handling
        EditorGUILayout.LabelField("Input for hash");
        inputString = EditorGUILayout.TextArea(inputString);

        if (GUILayout.Button("Calculate hashes"))
        {

            CheckHash(inputString, true);
        }

        if (GUILayout.Button("Run test suite"))
        {
            int testBatch = 4096;
            int testCount = 0, succeeded = 0;

            System.Random random = new System.Random();
            string chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!\"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~\n";
            string buffer = new string(Enumerable.Repeat(chars, testBatch).Select(s => s[random.Next(s.Length)]).ToArray());

            Debug.Log($"Buffer generated for ASCII testing: {buffer}");

            for (int i = 0; i < testBatch; i++)
            {
                string test = buffer.Substring(random.Next(buffer.Length - i), i);

                testCount++;
                if (CheckHash(test))
                    succeeded++;
            }

            // Japanese character (UTF-8) test
            chars = "\u3042\u3044\u3046\u3048\u304a\u304b\u304d\u304f\u3051\u3053\u3055\u3057\u3059\u305b\u305d\u305f\u3061\u3064\u3066\u3068\u306a\u306b\u306c\u306d\u306e\u306f\u3072\u3075\u3078\u307b\u307e\u307f\u3080\u3081\u3082\u3084\u3086\u3088\u3089\u308a\u308b\u308c\u308d\u308f\u3090\u3091\u3092\u3093\u30a2\u30a4\u30a6\u30a8\u30aa\u30ab\u30ad\u30af\u30b1\u30b3\u30b5\u30b7\u30b9\u30bb\u30bd\u30bf\u30c1\u30c4\u30c6\u30c8\u30ca\u30cb\u30cc\u30cd\u30ce\u30cf\u30d2\u30d5\u30d8\u30db\u30de\u30df\u30e0\u30e1\u30e2\u30e4\u30e6\u30e8\u30e9\u30ea\u30eb\u30ec\u30ed\u30ef\u30f0\u30f1\u30f2\u30f3";
            buffer = new string(Enumerable.Repeat(chars, testBatch).Select(s => s[random.Next(s.Length)]).ToArray());

            Debug.Log($"Buffer generated for JPN/UTF-8 testing: {buffer}");

            for (int i = 0; i < testBatch; i++)
            {
                string test = buffer.Substring(random.Next(buffer.Length - i), i);

                testCount++;
                if (CheckHash(test))
                    succeeded++;
            }

            EditorUtility.DisplayDialog("Results", $"{testCount} tests ran, {succeeded} succeeded in all hashes", "OK");
        }

        EditorGUI.EndDisabledGroup();
    }

    private bool CheckHash(string input, bool showDialog = false, bool showDialogWhenFailed = true)
    {
        UdonHashLib inspectorBehaviour = (UdonHashLib)target;

        string md5_udon = inspectorBehaviour.MD5_UTF8(input);
        string sha1_udon = inspectorBehaviour.SHA1_UTF8(input);
        string sha224_udon = inspectorBehaviour.SHA224_UTF8(input);
        string sha256_udon = inspectorBehaviour.SHA256_UTF8(input);
        string sha384_udon = inspectorBehaviour.SHA384_UTF8(input);
        string sha512_udon = inspectorBehaviour.SHA512_UTF8(input);

        string md5_csharp = GenerateNonUdon(input, System.Security.Cryptography.MD5.Create());
        string sha1_csharp = GenerateNonUdon(input, System.Security.Cryptography.SHA1.Create());
        string sha256_csharp = GenerateNonUdon(input, System.Security.Cryptography.SHA256.Create());
        string sha384_csharp = GenerateNonUdon(input, System.Security.Cryptography.SHA384.Create());
        string sha512_csharp = GenerateNonUdon(input, System.Security.Cryptography.SHA512.Create());

        bool allPass = (
            md5_udon == md5_csharp &&
            sha1_udon == sha1_csharp &&
            sha256_udon == sha256_csharp &&
            sha384_udon == sha384_csharp &&
            sha512_udon == sha512_csharp
        );

        if (showDialog || (!allPass && showDialogWhenFailed))
            EditorUtility.DisplayDialog("Hashes", string.Join("\n", new string[] {
                input,
                "",
                $"md5 [{(md5_udon == md5_csharp ? "PASS" : "FAIL")}]: {md5_udon}",
                $"sha1 [{(sha1_udon == sha1_csharp ? "PASS" : "FAIL")}]: {sha1_udon}",
                $"sha224: {sha224_udon}", // No system impl for this
                $"sha256 [{(sha256_udon == sha256_csharp ? "PASS" : "FAIL")}]: {sha256_udon}",
                $"sha384 [{(sha384_udon == sha384_csharp ? "PASS" : "FAIL")}]: {sha384_udon}",
                $"sha512 [{(sha512_udon == sha512_csharp ? "PASS" : "FAIL")}]: {sha512_udon}",
            }), "OK");

        return allPass;
    }

    private string GenerateNonUdon(string input, System.Security.Cryptography.HashAlgorithm algorithm)
    {
        using (var hash = algorithm)
        {
            var bytes = hash.ComputeHash(System.Text.Encoding.UTF8.GetBytes(input));

            string output = "";

            foreach (byte x in bytes)
            {
                output += string.Format("{0:x2}", x);
            }

            return output;
        }
    }
}
#endif

[RoseVelvette]

@Worcestershire im sorry but what kind of coding is that??

is there a simple number code to put in the key pad in nero VIP mmd world??

[Worcestershire]

@VelvetteCakeYT not unless someone programs a code generator ¯\_(ツ)_/¯
The code is generated based on your VRChat user, so there won't be a simple code to put in the keypad.

[RoseVelvette]

@Worcestershire if people sub to nero patreon will they get the simple number code to put on key pad?

[Gamerfart9000]

@VelvetteCakeYT yea

[RoseVelvette]

@Gamerfart9000 do you need to pay to sub to nero patreon to get simple number code?

can someone with patreon account just give us the number code instead

[Snaggletooth]

There is no simple code. Each person has a different code. It is based on your name. When you sub to the patreon, you can be given your specific code.

That is why people are trying to figure out how it is generated. There have not been simple codes for 12 days, it is unlikely there will be simple codes again. If I were to give you my code, it would not work for you. If you were to give me yours, it would not work for me.

[C0rd3d]

So how would we be even able to crack the code then, I'm assuming they can see what codes are coming in or have a certain whitelist of the codes from patreon? Surely they wouldn't leave a loop hole like that for people to generate codes for their own names?

[Worcestershire]

@C4s3y If the code @Lucian posted is correct. They generate a code at runtime based on your VRChat name and check if the code you input matches. So unless there's more to that the only thing stopping us from getting the code seems to be the mystery of why replicating the code doesn't work.

[Worcestershire]

I've uploaded an executable that so far worked for me and my friends. [register or login to view this hidden content] It'll show you the codes and create a text file with them. The codes are generated based on the month so you'll have to generate a new one every month. Type your username EXACTLY as it appears in your VRChat profile.

If someone knows javascript they can turn this into a site to make it more accessible.

In case you don't trust the exe and want to run/compile the code yourself I'll post it bellow. You'll need python installed and the hashlib package to run it yourself.

import datetime, calendar, hashlib
PRE_SEED = '7oXtAXHz'

def get_date():
    now = datetime.datetime.now()
    last_day = calendar.monthrange(now.year, now.month)[1]  
    date = datetime.date(now.year, now.month, last_day)
    return date

def generate_code(name : bytes, date : datetime.datetime, is_spicy : bool, is_retry : bool):
    hash_key = "bundabunda" if is_retry and is_spicy else \
    "mikumiku"   if is_retry and not is_spicy else \
    "bunda"      if not is_retry and is_spicy else \
    "miku"
        
    formatted_date = date.strftime('%d/%m/%Y')

    code_key = f'{hash_key}{name}#{formatted_date}{PRE_SEED}'.encode()
        
    hash64 = hashlib.sha256(code_key).hexdigest()
    final_code = ''
    for ch in hash64:
        if ch.isdigit():
            final_code = final_code+ch

    if len(final_code) == 5: 
         final_code = f'{final_code}{date.strftime("%m")}'
    if not is_retry and len(final_code) <= 4:
        return generate_code(name * 2,date,is_spicy,True)

    return final_code[:6]


def main():
    player_name = input('VRChat Username: ')
    date = get_date()
    premium_code = generate_code(name=player_name,date=date,is_spicy=False,is_retry=False)
    spicy_code = generate_code(name=player_name,date=date,is_spicy=True,is_retry=False)
    print(f'Premium:\t{premium_code}\nSpicy:\t\t{spicy_code}')
    with open('codes.txt', 'w') as f:
        f.write(f'Premium:\t{premium_code}\nSpicy:\t\t{spicy_code}')
    print('\nCodes saved to "codes.txt"')
    input('Press enter to continue...')

if __name__ == '__main__':
    main()

[macrats]

worked

[TriTachyon]

@Worcestershire Welp, it works!

[Gamerfart9000]

gonna get on and test it out

[Gamerfart9000]

it workss

[Tailendo]

I guess nobody is gonna mention where the keypad is to enter the codes.

[Worcestershire]

@Tailendo On the wall to the left of where you select the songs, there should be a VIP button, click it and the keypad appears.

[ilovegiyuunsabi]

@TriTachyon I dont understand what i'm supposed to put in there- if I put in the numbers in the chatbox it just says incorrect

[Worcestershire]

@ilovegiyuunsabi Download the executable I've linked or run the code I posted. put your VRChat username EXACTLY as it's written in your profile. It will then give you two 6 numbers code. one for premium songs and one for spicy songs. You put that in the keypad to the left of the song selection wall. to access the keypad, click the "VIP" button.

[wwry]

@Worcestershire You’re a genius! Your code solved a huge problem.