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The imports at the top of the program simply declare that our program uses the Java security and cryptography support packages, in addition to the I/O library The IV_SIZE and KEY_SIZE for our AESEncrypter class are defined to be 16 bytes, or 128 bits BUFFER_SIZE specifies the size of the buffer that will be used to read in chunks of the input and write chunks of output AESEncrypter uses a cipher object, defined in the Java cryptography library, that will be used to actually do the encryption or decryption, as specified by the program s command-line arguments The secretKey object will store the secret, symmetric key that will be used The ivSpec object will specify the IV to be used to initialize the CBC The ivSpec object is initialized using bytes from ivBytes.

servers, and even an application server. Automating a deployment to multiple machines can become complex quickly. To reduce the complexity, Web Deploy can be used to sync files to multiple machines and execute the deployment script on each server. It can also run remotely so that deployments execute the same way that they would in the development environment. Listing 17.4 shows the command-line arguments used to copy deployment files from a build server to a web server and then run the deployment.

0, 1, 2, 3,

msdeploy.exe -verb:sync -source:dirPath=deploymentFiles -dest:dirPath='c:\installs',computername=192.168.1.34 msdeploy.exe -verb:sync -source:runCommand='c:\installs\dev.bat' -dest:auto,computername=192.168.1.34

1); 2); 3); 4);

The first line of the constructor for the AESEncrypter class initializes the cipher object to use AES in CBC mode: public AESEncrypter(SecretKey key) throws Exception { cipher = CiphergetInstance("AES/CBC/PKCS5Padding"); secretKey = key; } It also specifies that PKCS #5 padding should be used If the input to encrypt is not, say, a multiple of 128 bits, it will be padded extra data will be added to the input to force the input to be a multiple of 128 bits While we do not go into the details of PKCS #5 (or other padding schemes), you can read more about the topic in PKCS #5: Password-Based Cryptography Standard, by RSA Laboratories The remaining line in the constructor simply caches the secret key in a data member of the AESEncrypter object We describe the encrypt() and decrypt() methods next Both of them take input and output streams as parameters.

First, msdeploy.exe is called with the sync verb specifying a source directory on the local machine B. This command copies all the files inside the deploymentFiles directory (C:\installs) to the remote server (in this case, the computer with the IP address 192.168.1.34). Next, msdeploy.exe is called with the sync verb, but this time the runCommand argument is specified C. This means that Web Deploy will execute the batch file at c:\installs\dev.bat on the remote server in the same way you d run it if you logged in via remote desktop. Using a technology like Web Deploy can greatly simplify a complex deployment. By running each command locally on each server in the deployment, scripts will run consistently from the development environment through the production environment. The real advantage is that the calls to msdeploy.exe can be scripted, which means that a multiserver deployment can be totally automated and repeatable. Scripting this type of deployment also means that from a single machine you can monitor a deployment and see the results of each script consolidated on your desktop.

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17.5 Summary

The input stream allows the method to read input from a file (or from wherever the input stream originates), and the output stream allows the method to output data In the case of encrypt(), as you might expect, the input stream is plaintext and the output stream is ciphertext, while in the case of decrypt(), it is vice versa The encrypt() method is as follows: public void encrypt(InputStream in, OutputStream out) throws Exception { // create IV and write to output ivBytes = createRandBytes(IV_SIZE); outwrite(ivBytes); ivSpec = new IvParameterSpec(ivBytes); cipherinit(CipherENCRYPT_MODE, secretKey, ivSpec); // Bytes written to cipherOut will be encrypted CipherOutputStream cipherOut = new CipherOutputStream(out, cipher); // Read in the plaintext bytes and write to cipherOut to encrypt int numRead = 0; while ((numRead = inread(buf)) >= 0) cipherOutwrite(buf, 0, numRead); cipherOutclose(); }.

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