1 files changed, 32 insertions, 0 deletions
diff --git a/crypto/src/operators/utilities/IDigestAlgorithmFinder.cs b/crypto/src/operators/utilities/IDigestAlgorithmFinder.cs
new file mode 100644
index 000000000..867829dba
--- /dev/null
+++ b/crypto/src/operators/utilities/IDigestAlgorithmFinder.cs
@@ -0,0 +1,32 @@
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Operators.Utilities
+{
+    /// <summary>
+    /// Base interface for a finder of digest algorithm identifiers used with signatures.
+    /// </summary>
+    public interface IDigestAlgorithmFinder
+    {
+        /// <summary>
+        /// Find the digest algorithm identifier that matches with the passed in signature algorithm identifier.
+        /// </summary>
+        /// <param name="signatureAlgorithm">the signature algorithm of interest.</param>
+        /// <returns>an algorithm identifier for the corresponding digest.</returns>
+        AlgorithmIdentifier Find(AlgorithmIdentifier signatureAlgorithm);
+
+        /// <summary>
+        /// Find the digest algorithm identifier that matches with the passed in digest name.
+        /// </summary>
+        /// <param name="digestOid">the OID of the digest algorithm of interest.</param>
+        /// <returns>an algorithm identifier for the digest signature.</returns>
+        AlgorithmIdentifier Find(DerObjectIdentifier digestOid);
+
+        /// <summary>
+        /// Find the digest algorithm identifier that matches with the passed in digest name.
+        /// </summary>
+        /// <param name="digestName">the name of the digest algorithm of interest.</param>
+        /// <returns>an algorithm identifier for the digest signature.</returns>
+        AlgorithmIdentifier Find(string digestName);
+    }
+}