Port of new TLS API from bc-java

1 files changed, 94 insertions, 0 deletions

diff --git a/crypto/src/tls/HashAlgorithm.cs b/crypto/src/tls/HashAlgorithm.cs
new file mode 100644
index 000000000..2c8ba4fff
--- /dev/null
+++ b/crypto/src/tls/HashAlgorithm.cs
@@ -0,0 +1,94 @@
+using System;
+
+namespace Org.BouncyCastle.Tls
+{
+    /// <summary>RFC 5246 7.4.1.4.1</summary>
+    public abstract class HashAlgorithm
+    {
+        public const short none = 0;
+        public const short md5 = 1;
+        public const short sha1 = 2;
+        public const short sha224 = 3;
+        public const short sha256 = 4;
+        public const short sha384 = 5;
+        public const short sha512 = 6;
+
+        /*
+         * RFC 8422
+         */
+        public const short Intrinsic = 8;
+
+        public static string GetName(short hashAlgorithm)
+        {
+            switch (hashAlgorithm)
+            {
+            case none:
+                return "none";
+            case md5:
+                return "md5";
+            case sha1:
+                return "sha1";
+            case sha224:
+                return "sha224";
+            case sha256:
+                return "sha256";
+            case sha384:
+                return "sha384";
+            case sha512:
+                return "sha512";
+            case Intrinsic:
+                return "Intrinsic";
+            default:
+                return "UNKNOWN";
+            }
+        }
+
+        public static int GetOutputSize(short hashAlgorithm)
+        {
+            switch (hashAlgorithm)
+            {
+            case md5:
+                return 16;
+            case sha1:
+                return 20;
+            case sha224:
+                return 28;
+            case sha256:
+                return 32;
+            case sha384:
+                return 48;
+            case sha512:
+                return 64;
+            default:
+                return -1;
+            }
+        }
+
+        public static string GetText(short hashAlgorithm)
+        {
+            return GetName(hashAlgorithm) + "(" + hashAlgorithm + ")";
+        }
+
+        public static bool IsPrivate(short hashAlgorithm)
+        {
+            return 224 <= hashAlgorithm && hashAlgorithm <= 255;
+        }
+
+        public static bool IsRecognized(short hashAlgorithm)
+        {
+            switch (hashAlgorithm)
+            {
+                case md5:
+                case sha1:
+                case sha224:
+                case sha256:
+                case sha384:
+                case sha512:
+                case Intrinsic:
+                    return true;
+                default:
+                    return false;
+            }
+        }
+    }
+}