--- com/itextpdf/text/pdf/security/PdfPKCS7.java.orig	2016-07-21 13:39:36.202510000 +0700
+++ com/itextpdf/text/pdf/security/PdfPKCS7.java	2016-07-21 14:25:30.854422000 +0700
@@ -660,6 +660,12 @@ public class PdfPKCS7 {
             else if (digestEncryptionAlgorithm.equals("ECDSA")) {
                 this.digestEncryptionAlgorithmOid = SecurityIDs.ID_ECDSA;
             }
+            else if (digestEncryptionAlgorithm.equals("GOST3410")) {
+                this.digestEncryptionAlgorithmOid = SecurityIDs.ID_GOST3410;
+            }
+            else if (digestEncryptionAlgorithm.equals("ECGOST3410")) {
+                this.digestEncryptionAlgorithmOid = SecurityIDs.ID_ECGOST3410;
+            }
             else
                 throw new ExceptionConverter(new NoSuchAlgorithmException(MessageLocalization.getComposedMessage("unknown.key.algorithm.1", digestEncryptionAlgorithm)));
         }