Add BouncyCastle PCL files

1 files changed, 124 insertions, 0 deletions

diff --git a/crypto/src/cms/DefaultSignedAttributeTableGenerator.cs b/crypto/src/cms/DefaultSignedAttributeTableGenerator.cs
new file mode 100644
index 000000000..0e93392d9
--- /dev/null
+++ b/crypto/src/cms/DefaultSignedAttributeTableGenerator.cs
@@ -0,0 +1,124 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.Cms;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Cms
+{
+	/**
+	 * Default signed attributes generator.
+	 */
+	public class DefaultSignedAttributeTableGenerator
+		: CmsAttributeTableGenerator
+	{
+		private readonly IDictionary table;
+
+		/**
+		 * Initialise to use all defaults
+		 */
+		public DefaultSignedAttributeTableGenerator()
+		{
+			table = Platform.CreateHashtable();
+		}
+
+		/**
+		 * Initialise with some extra attributes or overrides.
+		 *
+		 * @param attributeTable initial attribute table to use.
+		 */
+		public DefaultSignedAttributeTableGenerator(
+			AttributeTable attributeTable)
+		{
+			if (attributeTable != null)
+			{
+				table = attributeTable.ToDictionary();
+			}
+			else
+			{
+				table = Platform.CreateHashtable();
+			}
+		}
+
+#if (SILVERLIGHT || PORTABLE)
+        /**
+		 * Create a standard attribute table from the passed in parameters - this will
+		 * normally include contentType, signingTime, and messageDigest. If the constructor
+		 * using an AttributeTable was used, entries in it for contentType, signingTime, and
+		 * messageDigest will override the generated ones.
+		 *
+		 * @param parameters source parameters for table generation.
+		 *
+		 * @return a filled in Hashtable of attributes.
+		 */
+		protected virtual IDictionary createStandardAttributeTable(
+			IDictionary parameters)
+		{
+            IDictionary std = Platform.CreateHashtable(table);
+            DoCreateStandardAttributeTable(parameters, std);
+            return std;
+		}
+#else
+        /**
+		 * Create a standard attribute table from the passed in parameters - this will
+		 * normally include contentType, signingTime, and messageDigest. If the constructor
+		 * using an AttributeTable was used, entries in it for contentType, signingTime, and
+		 * messageDigest will override the generated ones.
+		 *
+		 * @param parameters source parameters for table generation.
+		 *
+		 * @return a filled in Hashtable of attributes.
+		 */
+		protected virtual Hashtable createStandardAttributeTable(
+			IDictionary parameters)
+		{
+            Hashtable std = new Hashtable(table);
+            DoCreateStandardAttributeTable(parameters, std);
+			return std;
+		}
+#endif
+
+        private void DoCreateStandardAttributeTable(IDictionary parameters, IDictionary std)
+        {
+            // contentType will be absent if we're trying to generate a counter signature.
+            if (parameters.Contains(CmsAttributeTableParameter.ContentType))
+            {
+                if (!std.Contains(CmsAttributes.ContentType))
+                {
+                    DerObjectIdentifier contentType = (DerObjectIdentifier)
+                        parameters[CmsAttributeTableParameter.ContentType];
+                    Asn1.Cms.Attribute attr = new Asn1.Cms.Attribute(CmsAttributes.ContentType,
+                        new DerSet(contentType));
+                    std[attr.AttrType] = attr;
+                }
+            }
+
+            if (!std.Contains(CmsAttributes.SigningTime))
+            {
+                Asn1.Cms.Attribute attr = new Asn1.Cms.Attribute(CmsAttributes.SigningTime,
+                    new DerSet(new Time(DateTime.UtcNow)));
+                std[attr.AttrType] = attr;
+            }
+
+            if (!std.Contains(CmsAttributes.MessageDigest))
+            {
+                byte[] messageDigest = (byte[])parameters[CmsAttributeTableParameter.Digest];
+                Asn1.Cms.Attribute attr = new Asn1.Cms.Attribute(CmsAttributes.MessageDigest,
+                    new DerSet(new DerOctetString(messageDigest)));
+                std[attr.AttrType] = attr;
+            }
+        }
+
+        /**
+		 * @param parameters source parameters
+		 * @return the populated attribute table
+		 */
+		public virtual AttributeTable GetAttributes(
+			IDictionary parameters)
+		{
+            IDictionary table = createStandardAttributeTable(parameters);
+			return new AttributeTable(table);
+		}
+	}
+}