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-rw-r--r--crypto/src/crypto/Check.cs10
1 files changed, 10 insertions, 0 deletions
diff --git a/crypto/src/crypto/Check.cs b/crypto/src/crypto/Check.cs
index 035304db4..42996c920 100644
--- a/crypto/src/crypto/Check.cs
+++ b/crypto/src/crypto/Check.cs
@@ -1,4 +1,7 @@
 using System;
+#if NETCOREAPP3_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+using System.Diagnostics.CodeAnalysis;
+#endif
 
 namespace Org.BouncyCastle.Crypto
 {
@@ -42,7 +45,14 @@ namespace Org.BouncyCastle.Crypto
         }
 #endif
 
+#if NETCOREAPP3_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+        [DoesNotReturn]
+#endif
         internal static void ThrowDataLengthException(string message) => throw new DataLengthException(message);
+
+#if NETCOREAPP3_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+        [DoesNotReturn]
+#endif
         internal static void ThrowOutputLengthException(string message) => throw new OutputLengthException(message);
     }
 }