feat: Now, it's possible to fetch playlists from NetEase Cloud Music and download lyrics.

src/ZonyLrcTools.Common/Infrastructure/Encryption/NetEaseMusicEncryptionHelper.cs

@@ -0,0 +1,93 @@
+using System.Numerics;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace ZonyLrcTools.Common.Infrastructure.Encryption;
+
+/// <summary>
+/// 提供网易云音乐 API 的相关加密方法。
+/// </summary>
+/// <remarks>
+/// 加密方法参考以下开源项目:
+/// 1. https://github.com/jitwxs/163MusicLyrics/blob/master/MusicLyricApp/Api/Music/NetEaseMusicNativeApi.cs
+/// 2. https://github.com/mos9527/pyncm/blob/ad0a84b2ed5f1affa9890d5f54f6170c2cf99bbb/pyncm/utils/crypto.py#L53
+/// </remarks>
+public static class NetEaseMusicEncryptionHelper
+{
+    public const string Modulus =
+        "00e0b509f6259df8642dbc35662901477df22677ec152b5ff68ace615bb7b725152b3ab17a876aea8a5aa76d2e417629ec4ee341f56135fccf695280104e0312ecbda92557c93870114af6c9d05c4f7f0c3685b7a46bee255932575cce10b424d813cfe4875d3e82047b97ddef52741d546b8e289dc6935b3ece0462db0a22b8e7";
+
+    public const string Nonce = "0CoJUm6Qyw8W8jud";
+    public const string PubKey = "010001";
+    public const string Vi = "0102030405060708";
+
+    public static string RsaEncode(string text)
+    {
+        var srText = new string(text.Reverse().ToArray());
+        var a = BCHexDec(BitConverter.ToString(Encoding.Default.GetBytes(srText)).Replace("-", string.Empty));
+        var b = BCHexDec(PubKey);
+        var c = BCHexDec(Modulus);
+        var key = BigInteger.ModPow(a, b, c).ToString("x");
+        key = key.PadLeft(256, '0');
+
+        return key.Length > 256 ? key.Substring(key.Length - 256, 256) : key;
+    }
+
+    public static BigInteger BCHexDec(string hex)
+    {
+        var dec = new BigInteger(0);
+        var len = hex.Length;
+
+        for (var i = 0; i < len; i++)
+        {
+            dec += BigInteger.Multiply(new BigInteger(Convert.ToInt32(hex[i].ToString(), 16)),
+                BigInteger.Pow(new BigInteger(16), len - i - 1));
+        }
+
+        return dec;
+    }
+
+    public static string AesEncode(string secretData, string secret = "TA3YiYCfY2dDJQgg")
+    {
+        byte[] encrypted;
+        var iv = Encoding.UTF8.GetBytes(Vi);
+
+        using (var aes = Aes.Create())
+        {
+            aes.Key = Encoding.UTF8.GetBytes(secret);
+            aes.IV = iv;
+            aes.Mode = CipherMode.CBC;
+            using (var encryptor = aes.CreateEncryptor())
+            {
+                using (var stream = new MemoryStream())
+                {
+                    using (var cryptoStream = new CryptoStream(stream, encryptor, CryptoStreamMode.Write))
+                    {
+                        using (var sw = new StreamWriter(cryptoStream))
+                        {
+                            sw.Write(secretData);
+                        }
+
+                        encrypted = stream.ToArray();
+                    }
+                }
+            }
+        }
+
+        return Convert.ToBase64String(encrypted);
+    }
+
+    public static string CreateSecretKey(int length)
+    {
+        const string str = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+        var sb = new StringBuilder(length);
+        var rnd = new Random();
+
+        for (var i = 0; i < length; ++i)
+        {
+            sb.Append(str[rnd.Next(0, str.Length)]);
+        }
+
+        return sb.ToString();
+    }
+}

src/ZonyLrcTools.Common/Infrastructure/Exceptions/ErrorCodes.cs

@@ -31,6 +31,11 @@ namespace ZonyLrcTools.Common.Infrastructure.Exceptions
         /// 文本: 指定的编码不受支持，请检查配置，所有受支持的编码名称。
         /// </summary>
         public const int NotSupportedFileEncoding = 10005;
+        
+        /// <summary>
+        /// 文本: 无法从网易云音乐获取歌曲列表。
+        /// </summary>
+        public const int UnableGetSongListFromNetEaseCloudMusic = 10006;
 
         #endregion