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CHAPTER 5: Cryptography
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Table 5-4. Crypto Resources in net_rim_crypto_3
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CAST-128(CAST5) RC2 Skipjack ECIES ElGamal RSA-PSS RSA ANSI X9.31
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In practice, unless you know that your users are likely to be on limited devices, it is reasonable to write your app assuming all these algorithms are available, and to instruct users to acquire them if they happen to not be installed.
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Encryption with the RIM Crypto Classes
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While the general process of encryption proceeds similarly whether you are using Bouncy Castle or the RIM libraries, the actual details vary. You start by creating the secret key for the operation. Next, create either a stream encryptor or a block encryptor engine. If using a block cipher and your messages are not already padded, create a formatter engine. The RIM BlockEncryptor class plays a similar role to the Bouncy Castle Cipher classes: it manages the details of passing around the input plaintext, running the engine appropriately, and generating the output ciphertext. Unlike Bouncy Castle, which outputs directly to a byte array, RIM will write the ciphertext into an OutputStream. This can be convenient if you wish to direct the encoded message to a file or network connection, without managing the actual bytes. The code that follows shows how to encrypt a message using the RIM RC5 classes.
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String messageString = "The falcon cannot hear the falconer."; byte[] messageBytes = messageString.getBytes(); String keyString = "beast"; byte[] keyBytes = keyString.getBytes(); RC5Key key = new RC5Key(keyBytes); RC5EncryptorEngine engine = new RC5EncryptorEngine(key); PKCS5FormatterEngine padder = new PKCS5FormatterEngine(engine); ByteArrayOutputStream output = new ByteArrayOutputStream(); BlockEncryptor encryptor = new BlockEncryptor(padder, output); encryptor.write(messageBytes); encryptor.close(); output.flush(); byte[] cipherBytes = output.toByteArray(); String cipherString = new String(cipherBytes);
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CHAPTER 5: Cryptography
System.out.println("Encoded message is [" + cipherString + "]");
You can adapt this example for any other type of block cipher. For stream encryption, you will provide the OutputStream directly to the StreamEncryptor subclass s constructor and omit the padder. Several exceptions may occur during encryption and decryption operations. CryptoUnsupportedOperationException indicates that this particular algorithm is not supported. CryptoTokenException occurs when the operation is associated with a physical token, such as a smart card, that is not present or has a problem. Finally, a generic IOException may occur due to problems writing to the requested OutputStream.
Decryption with the RIM Crypto Classes
As mentioned before, the RIM libraries include separate classes to handle the decryption step. For example, the RC5DecryptorEngine is the counterpart of RC5EncryptorEngine, and a BlockUnformatterEngine matches a BlockFormatterEngine. The most significant difference between encryption and decryption is that decryption writes its output into a provided byte array, not an OutputStream. If you do not know in advance how large a message will be, you will need to progressively build up the decrypted message yourself. The example below illustrates how to do this, decrypting the ciphertext that was generated above. You ll notice the loop that repeatedly reads data in small chunks. This is a common pattern that is used in many I/O operations other than crypto.
byte[] cipherBytes; String keyString = "beast"; byte[] keyBytes = keyString.getBytes(); RC5Key key = new RC5Key(keyBytes); RC5DecryptorEngine engine = new RC5DecryptorEngine(key); PKCS5UnformatterEngine unpadder = new PKCS5UnformatterEngine(engine); ByteArrayInputStream input = new ByteArrayInputStream(cipherBytes); BlockDecryptor decryptor = new BlockDecryptor(unpadder, input); ByteArrayOutputStream decryptedStream = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int bytesRead = 0; do { bytesRead = decryptor.read(buffer); if (bytesRead != -1) {
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decryptedStream.write(buffer, 0, bytesRead); } } while (bytesRead != -1); byte[] decryptedBytes = decryptedStream.toByteArray(); String decodedMessage = new String(decryptedBytes); System.out.println("Original message was [" + decodedMessage + "]");
Using RIM Crypto with Digests
The RIM crypto packages include several popular hash algorithms, including multiple versions of SHA and MD. As when creating digests for Bouncy Castle, you may run a digest over an entire message and obtain a hash. For this section s examples, we ll create unsigned digests to simply verify message integrity, but you can apply the exact same principles as before to cryptographically sign your messages. RIM does add some convenient classes to use in digest operations. Unlike Bouncy Castle digests, which are more focused on byte arrays for operations, RIM digests can work with streams. You may choose to wrap several streams together to obtain a desired result. The following code example demonstrates how to use two useful utility stream, Base64OutputStream and DigestOutputStream, to automatically Base64 encode the digest value. Data flows from the input bytes, through the digest algorithm, out to the digest stream, then through Base64 encoding, and finally to the destination bytes.
String message = "Not all who wander are lost."; byte[] messageBytes = message.getBytes(); MD5Digest digest = new MD5Digest(); ByteArrayOutputStream bytesOut = new ByteArrayOutputStream(); Base64OutputStream base64 = new Base64OutputStream(bytesOut); DigestOutputStream digestOut = new DigestOutputStream(digest, base64); digest.update(messageBytes); digestOut.flush(); byte[] base64Checksum = bytesOut.toByteArray(); String base64String = new String(base64Checksum);
If you wish to verify the checksum for data you have received, follow the exact same code as before, comparing the calculated base64Checksum with the version you received. If they are identical, the message was not corrupted since it was sent. You may also use a cryptographic signing strategy if you wish to verify the authenticity of the sender.
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