GenToken has three steps: Initialize the HVE, Populate the HVE, and run QED_GenToken.
An example is presented at the end.

1. Initialize HVE:
   
   To initialize an HVE for the token function, simply call HVE_Init_Token with the Private Key. This can be done only after the Setup has been ran, and a Private Key has been generated;

   int HVE_Init_Token(
   		HVE_t *HVE, 
   		QEDPrivateKey_t *PrivKey);
   



2. Populate HVE:
   
   Please refer to the subsection on Populating the HVE.



3. Run QED_GenToken:
   
   QED_GenToken will take in the Private Key, the HVE and the context, and populate a QED_Token_t.

   int QED_GenToken(
   	        QEDToken_t *Token,
        	   	QEDPrivateKey_t *PrivKey,
         	  	HVE_t *HVE,
          		QED_CTX *c);
   

Example

This example builds on top of the example started in the setup section.

First, declare a context, a token, a private key and an HVE variable.

	QED_CTX c;
	QEDToken_t Token;
	QEDPrivateKey_t PrivKey;
	HVE_t HVE;

Second, initialize the context variable to use TYPE1 algorithm.

        QED_Init(&c, TYPE1);

Third, obtain the private key.

A file containing a serialized private key should have been created at setup time. Read the contents of this file into an unsigned char buffer, and use Import/Export functions to deserialize the variable PrivKey.

Fourth, initialize the HVE with the Private Key.

	HVE_Init_Token(&HVE, &PrivKey);

Fifth, populate the HVE with appropriate data.

From setup know the HVE is expecting:
• an integer for a comparison query on the first sector
• a string for an equality query on the second sector
• three strings for a subset query on the third sector
• an integer for a raw query

Populate the first sector of the HVE

	HVE_COMPARISON_t comp = {2, 0};
	HVE_Insert_Comparison(&HVE, &comp);

Populate the second sector of the HVE

	HVE_EQUALITY_t equal = {"foo", 3, 1};
	HVE_Insert_Equality(&HVE, &equal);

Populate the third sector of the HVE

	HVE_SUBSET_DATA_t  data[4] = { {"hello", 5}, {"world", 5},
				       {"beautiful", 9}, {END, END} };
	HVE_SUBSET subset = {data, 4, 2};
	HVE_Insert_Subset(&HVE, &subset);

Populate the fourth sector of the HVE

	HVE_RAW_t raw = {18, 3};
	HVE_Insert_Raw(&HVE, &raw);

Finally, generate the token for the above HVE.

	QED_GenToken(&Token, &PrivKey, &HVE, &c);