From 2ab456c7ddadf9acb54c41ec49b6e535b3970363 Mon Sep 17 00:00:00 2001
From: cantor <cantor@de75baf8-a10c-0410-a50a-987c0e22f00f>
Date: Tue, 31 Aug 2010 17:48:11 +0000
Subject: [PATCH] Add method to test for algorithm support.

git-svn-id: https://svn.middleware.georgetown.edu/cpp-xmltooling/branches/REL_1@778 de75baf8-a10c-0410-a50a-987c0e22f00f
---
 xmltooling/XMLToolingConfig.cpp | 14 ++++++++++++++
 xmltooling/XMLToolingConfig.h   |  7 +++++++
 xmltooling/internal.h           |  1 +
 3 files changed, 22 insertions(+)

diff --git a/xmltooling/XMLToolingConfig.cpp b/xmltooling/XMLToolingConfig.cpp
index c9821ee..5dcfaaf 100644
--- a/xmltooling/XMLToolingConfig.cpp
+++ b/xmltooling/XMLToolingConfig.cpp
@@ -61,6 +61,7 @@
 #ifndef XMLTOOLING_NO_XMLSEC
 # include <curl/curl.h>
 # include <openssl/err.h>
+# include <xsec/framework/XSECAlgorithmMapper.hpp>
 # include <xsec/framework/XSECException.hpp>
 # include <xsec/framework/XSECProvider.hpp>
 # include <xsec/transformers/TXFMBase.hpp>
@@ -605,6 +606,7 @@ bool XMLToolingInternalConfig::load_library(const char* path, void* context)
 }
 
 #ifndef XMLTOOLING_NO_XMLSEC
+
 void xmltooling::log_openssl()
 {
     const char* file;
@@ -626,6 +628,17 @@ XSECCryptoX509CRL* XMLToolingInternalConfig::X509CRL() const
     return new OpenSSLCryptoX509CRL();
 }
 
+bool XMLToolingInternalConfig::isXMLAlgorithmSupported(const XMLCh* xmlAlgorithm)
+{
+    try {
+        if (XSECPlatformUtils::g_algorithmMapper->mapURIToHandler(xmlAlgorithm))
+            return true;
+    }
+    catch (XSECException&) {
+    }
+    return false;
+}
+
 void XMLToolingInternalConfig::registerXMLAlgorithms()
 {
     registerXMLAlgorithm(DSIGConstants::s_unicodeStrURIRSA_MD5, "RSA", 0);
@@ -663,6 +676,7 @@ void XMLToolingInternalConfig::registerXMLAlgorithms()
     registerXMLAlgorithm(DSIGConstants::s_unicodeStrURIAES256_CBC, "AES", 256);
     registerXMLAlgorithm(DSIGConstants::s_unicodeStrURIKW_AES256, "AES", 256);
 }
+
 #endif
 
 #ifdef WIN32
diff --git a/xmltooling/XMLToolingConfig.h b/xmltooling/XMLToolingConfig.h
index f23f62c..56beaf0 100644
--- a/xmltooling/XMLToolingConfig.h
+++ b/xmltooling/XMLToolingConfig.h
@@ -294,6 +294,13 @@ namespace xmltooling {
          * @param size          a key size (or 0 if the size is irrelevant)
          */
         virtual void registerXMLAlgorithm(const XMLCh* xmlAlgorithm, const char* keyAlgorithm, unsigned int size=0)=0;
+
+        /**
+         * Checks for implementation support of a particular XML security algorithm.
+         *
+         * @return  true iff the algorithm is supported by the underlying libraries
+         */
+        virtual bool isXMLAlgorithmSupported(const XMLCh* xmlAlgorithm)=0;
 #endif
 
         /**
diff --git a/xmltooling/internal.h b/xmltooling/internal.h
index 189617e..f4f8bea 100644
--- a/xmltooling/internal.h
+++ b/xmltooling/internal.h
@@ -131,6 +131,7 @@ namespace xmltooling {
 # endif
         }
 
+        bool isXMLAlgorithmSupported(const XMLCh* xmlAlgorithm);
         void registerXMLAlgorithms();
 
         XSECProvider* m_xsecProvider;
-- 
2.1.4