made secret_t non-constant size and added params_t::query_string function

1. removed checking that secret_t is exactly 20 bytes, because its size is not
   so constant anymore.
2. added a query_string function that produces a query string suitable for use
   in GET and POST requests. I'm making use of it when performing direct
   request when establishing associations.

Signed-off-by: Michael Krelin <hacker@klever.net>

3 files changed, 30 insertions, 13 deletions

diff --git a/include/opkele/types.h b/include/opkele/types.h
index 520618d..ca07df5 100644
--- a/include/opkele/types.h
+++ b/include/opkele/types.h
@@ -41,14 +41,14 @@ namespace opkele {
 	    /**
 	     * xor the secret and hmac together and encode, using base64
-	     * @param key_sha1 pointer to the sha1 digest
+	     * @param key_d pointer to the message digest
 	     * @param rv reference to the return value
 	     */
-	    void enxor_to_base64(const unsigned char *key_sha1,string& rv) const;
+	    void enxor_to_base64(const unsigned char *key_d,string& rv) const;
 	    /**
-	     * decode base64-encoded secret and xor it with the sha1 digest
-	     * @param key_sha1 pointer to the message digest
+	     * decode base64-encoded secret and xor it with the message digest
+	     * @param key_d pointer to the message digest
 	     * @param b64 base64-encoded secret value
 	     */
-	    void enxor_from_base64(const unsigned char *key_sha1,const string& b64);
+	    void enxor_from_base64(const unsigned char *key_d,const string& b64);
 	    /**
 	     * plainly encode to base64 representation
@@ -162,4 +162,12 @@ namespace opkele {
 	     */
 	    string append_query(const string& url,const char *prefix = "openid.") const;
+
+	    /**
+	     * make up a query string suitable for use in GET and POST
+	     * requests.
+	     * @param prefix string to prened to parameter names
+	     * @return query string
+	     */
+	    string query_string(const char *prefix = "openid.") const;
     };
 
diff --git a/lib/params.cc b/lib/params.cc
index ea86d3a..7a572c1 100644
--- a/lib/params.cc
+++ b/lib/params.cc
@@ -100,4 +100,17 @@ namespace opkele {
     }
 
+    string params_t::query_string(const char *prefix) const {
+	string rv;
+	for(const_iterator i=begin();i!=end();++i) {
+	    if(!rv.empty())
+		rv += '&';
+	    rv += prefix;
+	    rv += i->first;
+	    rv += '=';
+	    rv += util::url_encode(i->second);
+	}
+	return rv;
+    }
+
     ostream& operator << (ostream& o,const params_t& p) {
 	for(params_t::const_iterator i=p.begin();i!=p.end();++i)
diff --git a/lib/secret.cc b/lib/secret.cc
index 632a2ca..d538890 100644
--- a/lib/secret.cc
+++ b/lib/secret.cc
@@ -15,11 +15,9 @@ namespace opkele {
 	};
 
-    void secret_t::enxor_to_base64(const unsigned char *key_sha1,string& rv) const {
-	if(size()!=20)
-	    throw bad_input(OPKELE_CP_ "wrong secret size");
+    void secret_t::enxor_to_base64(const unsigned char *key_d,string& rv) const {
 	vector<unsigned char> tmp;
 	transform(
 		begin(), end(),
-		key_sha1,
+		key_d,
 		back_insert_iterator<vector<unsigned char> >(tmp),
 		bitwise_xor<unsigned char,unsigned char,unsigned char>() );
@@ -27,10 +25,10 @@ namespace opkele {
     }
 
-    void secret_t::enxor_from_base64(const unsigned char *key_sha1,const string& b64) {
+    void secret_t::enxor_from_base64(const unsigned char *key_d,const string& b64) {
 	clear();
 	util::decode_base64(b64,*this);
 	transform(
 		begin(), end(),
-		key_sha1,
+		key_d,
 		begin(),
 		bitwise_xor<unsigned char,unsigned char,unsigned char>() );
@@ -38,6 +36,4 @@ namespace opkele {
 
     void secret_t::to_base64(string& rv) const {
-	if(size()!=20)
-	    throw bad_input(OPKELE_CP_ "wrong secret size");
 	rv = util::encode_base64(&(front()),size());
     }