Enterprise Library Test Guide - Willy .Net

Introduction
Performing Code Reviews
Code reviews happen periodically throughout the development cycle. The process is
similar to that of the design reviews. Each test case must be satisfied by a specific part
of the implementation. The Microsoft test team used checklists for the code review
that were similar to the ones used for the design review. Table 4 is an example of the
code checklist for the Cryptography Application Block.
Table 4: Cryptography Application Block Code Verification
Code Test Case
Verify that the Cryptographer
facade exposes
all public members as
static and supports
methods for encryption,
decryption, and hashing.
Implemented?
Yes
Feature That is Implemented
The Cryptographer class is a facade that exposes the
CreateHash method to compute the hash value of plain
text, the CompareHash method to compare plain text
with a hash value, the EncryptSymmetric method to
encrypt plain text, and the DecryptSymmetric method
to decrypt a symmetrically encrypted secret. These
methods are shown in the following code.
public static byte[] CreateHash(string
hashInstance, byte[] plaintext) {}
public static bool CompareHash(string
hashInstance, string plaintext, string
hashedText) {}
public static string EncryptSymmetric(string
symmetricInstance, string plaintext) {}
Verify that the Cryptographer
facade uses the
SymmetricCryptoProviderFactory
class and
the HashProviderFactory
class to create the cryptography
providers.
Yes
public static string DecryptSymmetric(string
symmetricInstance, string ciphertextBase64) {}
The client code calls static methods on the Cryptographer
class to create hashes, compare hashes, encrypt
data, and decrypt data. Each static method instantiates a
factory class and passes the configuration source to the
factory class’s constructor. The factory uses the configuration
data to determine the type of provider to create.
The following code demonstrates how the Cryptographer.
EncryptSymmetric method calls the SymmetricCrypto-
ProviderFactory class to create a symmetric provider. The
process is similar for hash providers.
public static byte[] EncryptSymmetric(string
symmetricInstance, byte[] plaintext)
{
…
SymmetricCryptoProviderFactory factory = new
SymmetricCryptoProviderFactory(ConfigurationSou
rceFactory.Create());
…
}