init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Signers/IsoTrailers.cs

@@ -0,0 +1,58 @@
+using System.Collections;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.Crypto.Signers;
+
+public class IsoTrailers
+{
+	public const int TRAILER_IMPLICIT = 188;
+
+	public const int TRAILER_RIPEMD160 = 12748;
+
+	public const int TRAILER_RIPEMD128 = 13004;
+
+	public const int TRAILER_SHA1 = 13260;
+
+	public const int TRAILER_SHA256 = 13516;
+
+	public const int TRAILER_SHA512 = 13772;
+
+	public const int TRAILER_SHA384 = 14028;
+
+	public const int TRAILER_WHIRLPOOL = 14284;
+
+	public const int TRAILER_SHA224 = 14540;
+
+	public const int TRAILER_SHA512_224 = 14796;
+
+	public const int TRAILER_SHA512_256 = 16588;
+
+	private static readonly IDictionary trailerMap = CreateTrailerMap();
+
+	private static IDictionary CreateTrailerMap()
+	{
+		IDictionary dictionary = Platform.CreateHashtable();
+		dictionary.Add("RIPEMD128", 13004);
+		dictionary.Add("RIPEMD160", 12748);
+		dictionary.Add("SHA-1", 13260);
+		dictionary.Add("SHA-224", 14540);
+		dictionary.Add("SHA-256", 13516);
+		dictionary.Add("SHA-384", 14028);
+		dictionary.Add("SHA-512", 13772);
+		dictionary.Add("SHA-512/224", 14796);
+		dictionary.Add("SHA-512/256", 16588);
+		dictionary.Add("Whirlpool", 14284);
+		return CollectionUtilities.ReadOnly(dictionary);
+	}
+
+	public static int GetTrailer(IDigest digest)
+	{
+		return (int)trailerMap[digest.AlgorithmName];
+	}
+
+	public static bool NoTrailerAvailable(IDigest digest)
+	{
+		return !trailerMap.Contains(digest.AlgorithmName);
+	}
+}