1 files changed, 91 insertions, 0 deletions
diff --git a/mcs/class/referencesource/System.Core/System/Security/Cryptography/ECDsa.cs b/mcs/class/referencesource/System.Core/System/Security/Cryptography/ECDsa.cs
index a161a6a186f..22fb8b50528 100644
--- a/mcs/class/referencesource/System.Core/System/Security/Cryptography/ECDsa.cs
+++ b/mcs/class/referencesource/System.Core/System/Security/Cryptography/ECDsa.cs
@@ -5,6 +5,7 @@
 // ==--==
 
 using System;
+using System.IO;
 
 namespace System.Security.Cryptography {
     /// <summary>
@@ -44,7 +45,97 @@ namespace System.Security.Cryptography {
         // Signature operations
         //
 
+        // ECDsa does not encode the algorithm identifier into the signature blob, therefore SignHash and VerifyHash
+        // do not need the HashAlgorithmName value, only SignData and VerifyData do.
         public abstract byte[] SignHash(byte[] hash);
         public abstract bool VerifyHash(byte[] hash, byte[] signature);
+
+        protected virtual byte[] HashData(byte[] data, int offset, int count, HashAlgorithmName hashAlgorithm) {
+            throw DerivedClassMustOverride();
+        }
+
+        protected virtual byte[] HashData(Stream data, HashAlgorithmName hashAlgorithm) {
+            throw DerivedClassMustOverride();
+        }
+
+        public virtual byte[] SignData(byte[] data, HashAlgorithmName hashAlgorithm) {
+            if (data == null) {
+                throw new ArgumentNullException("data");
+            }
+            return SignData(data, 0, data.Length, hashAlgorithm);
+        }
+
+        public virtual byte[] SignData(byte[] data, int offset, int count, HashAlgorithmName hashAlgorithm) {
+            if (data == null) { throw new ArgumentNullException("data"); }
+            if (offset < 0 || offset > data.Length) { throw new ArgumentOutOfRangeException("offset"); }
+            if (count < 0 || count > data.Length - offset) { throw new ArgumentOutOfRangeException("count"); }
+            if (String.IsNullOrEmpty(hashAlgorithm.Name)) { throw HashAlgorithmNameNullOrEmpty(); }
+
+            byte[] hash = HashData(data, offset, count, hashAlgorithm);
+            return SignHash(hash);
+        }
+
+        public virtual byte[] SignData(Stream data, HashAlgorithmName hashAlgorithm) {
+            if (data == null) {
+                throw new ArgumentNullException("data");
+            }
+            if (String.IsNullOrEmpty(hashAlgorithm.Name)) {
+                throw HashAlgorithmNameNullOrEmpty();
+            }
+
+            byte[] hash = HashData(data, hashAlgorithm);
+            return SignHash(hash);
+        }
+
+        public bool VerifyData(byte[] data, byte[] signature, HashAlgorithmName hashAlgorithm) {
+            if (data == null) {
+                throw new ArgumentNullException("data");
+            }
+            return VerifyData(data, 0, data.Length, signature, hashAlgorithm);
+        }
+
+        public virtual bool VerifyData(byte[] data, int offset, int count, byte[] signature, HashAlgorithmName hashAlgorithm) {
+            if (data == null) {
+                throw new ArgumentNullException("data");
+            }
+            if (offset < 0 || offset > data.Length) {
+                throw new ArgumentOutOfRangeException("offset");
+            }
+            if (count < 0 || count > data.Length - offset) {
+                throw new ArgumentOutOfRangeException("count");
+            }
+            if (signature == null) {
+                throw new ArgumentNullException("signature");
+            }
+            if (String.IsNullOrEmpty(hashAlgorithm.Name)) {
+                throw HashAlgorithmNameNullOrEmpty();
+            }
+
+            byte[] hash = HashData(data, offset, count, hashAlgorithm);
+            return VerifyHash(hash, signature);
+        }
+
+        public bool VerifyData(Stream data, byte[] signature, HashAlgorithmName hashAlgorithm) {
+            if (data == null) {
+                throw new ArgumentNullException("data");
+            }
+            if (signature == null) {
+                throw new ArgumentNullException("signature");
+            }
+            if (String.IsNullOrEmpty(hashAlgorithm.Name)) {
+                throw HashAlgorithmNameNullOrEmpty();
+            }
+
+            byte[] hash = HashData(data, hashAlgorithm);
+            return VerifyHash(hash, signature);
+        }
+
+        private static Exception DerivedClassMustOverride() {
+            return new NotImplementedException(SR.GetString(SR.NotSupported_SubclassOverride));
+        }
+
+        internal static Exception HashAlgorithmNameNullOrEmpty() {
+            return new ArgumentException(SR.GetString(SR.Cryptography_HashAlgorithmNameNullOrEmpty), "hashAlgorithm");
+        }
     }
 }