oh dear

mscorlib/System/Security/Cryptography/MaskGenerationMethod.cs

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+using System;
+using System.Runtime.InteropServices;
+using Cpp2IlInjected;
+
+namespace System.Security.Cryptography
+{
+	/// <summary>Represents the abstract class from which all mask generator algorithms must derive.</summary>
+	// Token: 0x020003F5 RID: 1013
+	[Token(Token = "0x20003F5")]
+	[ComVisible(true)]
+	public abstract class MaskGenerationMethod
+	{
+		/// <summary>When overridden in a derived class, generates a mask with the specified length using the specified random seed.</summary>
+		/// <param name="rgbSeed">The random seed to use to compute the mask.</param>
+		/// <param name="cbReturn">The length of the generated mask in bytes.</param>
+		/// <returns>A randomly generated mask whose length is equal to the <paramref name="cbReturn" /> parameter.</returns>
+		// Token: 0x06002203 RID: 8707
+		[Token(Token = "0x6002203")]
+		[Address(Slot = "4")]
+		[ComVisible(true)]
+		public abstract byte[] GenerateMask(byte[] rgbSeed, int cbReturn);
+
+		/// <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.MaskGenerationMethod" /> class.</summary>
+		// Token: 0x06002204 RID: 8708 RVA: 0x00002050 File Offset: 0x00000250
+		[Token(Token = "0x6002204")]
+		[Address(RVA = "0x3F5100", Offset = "0x3F3F00", VA = "0x1803F5100")]
+		protected MaskGenerationMethod()
+		{
+		}
+	}
+}