1 files changed, 40 insertions, 0 deletions
diff --git a/crypto/src/bcpg/sig/RegularExpression.cs b/crypto/src/bcpg/sig/RegularExpression.cs
new file mode 100644
index 000000000..c4b48ea2a
--- /dev/null
+++ b/crypto/src/bcpg/sig/RegularExpression.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Text.RegularExpressions;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Bcpg.Sig
+{
+    /**
+     * Regexp Packet - RFC 4880 5.2.3.14. Note: the RFC says the byte encoding is to be null terminated.
+     */
+    public class RegularExpression
+        : SignatureSubpacket
+    {
+        public RegularExpression(bool critical, bool isLongLength, byte[] data)
+            : base(SignatureSubpacketTag.RegExp, critical, isLongLength, data)
+        {
+            if (data[data.Length - 1] != 0)
+                throw new ArgumentException("data in regex missing null termination");
+        }
+
+        public RegularExpression(bool critical, string regex)
+            : base(SignatureSubpacketTag.RegExp, critical, false, ToNullTerminatedUtf8ByteArray(regex))
+        {
+        }
+
+        public string Regex
+        {
+            // last byte is null terminator
+            get { return Strings.FromUtf8ByteArray(data, 0, data.Length - 1); }
+        }
+
+        public byte[] GetRawRegex() => Arrays.Clone(data);
+
+        private static byte[] ToNullTerminatedUtf8ByteArray(string str)
+        {
+            byte[] utf8 = Strings.ToUtf8ByteArray(str);
+            return Arrays.Append(utf8, 0x00);
+        }
+    }
+}