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With the general wrappers out of the way, we move on to wrap the code necessary to perform the PKI signature and verification processes. The first of these, key_sign_data(), performs the signing process on the given data with the provided key and returns the result in the provided buffer that is passed by reference. The unsigned integer that is returned indicates the number of bytes in the signature itself.

You ve done quite a lot of coding in this chapter. You implemented a number of componentized templates, along with their middle-tier methods and methods for the data tier. You learned how to implement a simple authentication scheme so only administrators are allowed to access the catalog administration page. At the conclusion of the chapter, you learned how to upload files from the client to the server using PHP . In the next chapter, you enter the second stage of development by implementing a custom shopping basket into your web site.

unsigned int key_sign_data(RSA *this_key,const char *original, unsigned int orig_size,char *signd,unsigned int signd_length) { EVP_MD_CTX my_evp; EVP_PKEY * pkey; unsigned int signed_length = 0; if(this_key == NULL) return 0; pkey = EVP_PKEY_new(); EVP_PKEY_set1_RSA(pkey,this_key); signed_length = signd_length; EVP_SignInit(&my_evp, EVP_md5()); EVP_SignUpdate (&my_evp,original, orig_size); EVP_SignFinal (&my_evp,signd, &signed_length,pkey); EVP_PKEY_free(pkey); return signed_length; }

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Aggregation is when an object consists of a composite of other objects that work together. For example, your lawn mower object is a composite of the wheel objects, the engine object, the blade object, and so on. In fact, the engine object is a composite of many other objects. There are many examples of aggregation in the world around us. The ability to use aggregation in OOP is a powerful feature that enables you to accurately model and implement business processes in your programs.

elcome to the second stage of development! At this stage, you start improving and adding new features to the already existing, fully functional e-commerce site So, what exactly can you improve Well, the answer to this question isn t hard to find if you take a quick look at the popular e-commerce sites on the web They personalize the experience for the user, provide product recommendations, remember customers preferences, and boast many other features that make the site easy to remember and hard to leave without first purchasing something In the first stage of development, you extensively relied on a third-party payment processor (PayPal) that supplied an integrated shopping cart, so you didn t record any shopping cart or order info in the database.

The signature verification process is encapsulated in the function,

arguments. If the signature is verified with the passed key, then the function returns 0; otherwise, it returns 1.

Right now, your site isn t capable of displaying a list of most wanted products or any other information about the products that have been sold through the web site because, at this stage, you aren t tracking the products sold This makes it impossible to implement any of these improvements Obviously, saving order information in the database is your first priority In fact, most of the features you ll want to implement next rely on having a record of the products sold To achieve this functionality, in this chapter, you ll implement a custom shopping cart, which will store data in the local hatshop database This will provide you with more flexibility than the PayPal shopping cart over which you have no control and which cannot be easily saved into your database for further processing and analysis.

int key_verify_signature(RSA *this_key, char *signd,unsigned int s_length,char * u_signed,unsigned int u_length) { EVP_MD_CTX my_evp; EVP_PKEY * pkey; int retval = 0; if(this_key == NULL) return -1; pkey = EVP_PKEY_new(); EVP_PKEY_set1_RSA(pkey,this_key); EVP_VerifyInit(&my_evp,EVP_md5()); EVP_VerifyUpdate(&my_evp,u_signed,u_length); retval = EVP_VerifyFinal (&my_evp,signd,s_length,pkey); EVP_PKEY_free(pkey); if(retval) return 0;

With the custom shopping cart, when the visitor clicks the Add to Cart button for a product, the product is added to the visitor s shopping cart When the visitor clicks the View Cart button, a page like the one shown in Figure 8-1 appears..

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Figure 8-1. The HatShop shopping cart Our shopping cart will have a Save for Later feature, which allows the visitor to move a shopping cart product to a separate list, in case he or she wants to buy only a part of the items (see Figure 8-2).

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