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POCan you figure out why this program is triggering a IllegalStateException?
 

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  1. POCan you figure out why this program is triggering a IllegalStateException?
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    <p>all files in ~/Cipher/nsdl/crypto can be found <a href="http://nsdeleon.wikispaces.com/file/detail/crypto.zip" rel="nofollow noreferrer">here</a> java files compiled with gcj, see compile.sh</p> <pre><code>nmint@nqmk-mint ~/Cipher/nsdl/crypto $ echo test | ./cryptTest encrypt deadbeefdeadbeefdeadbeefdeadbeef deadbeef Blowfish CBC &gt; test null Exception in thread "main" java.lang.IllegalStateException: cipher is not for encrypting or decrypting at javax.crypto.Cipher.update(libgcj.so.81) at javax.crypto.CipherOutputStream.write(libgcj.so.81) at nsdl.crypto.BlockCrypt.encrypt(cryptTest) at nsdl.crypto.cryptTest.main(cryptTest) </code></pre> <p>BlockCrypt.java: </p> <pre><code>package nsdl.crypto; import java.io.*; import java.security.spec.*; import javax.crypto.*; import javax.crypto.spec.*; public class BlockCrypt { Cipher ecipher; Cipher dcipher; byte[] keyBytes; byte[] ivBytes; SecretKey key; AlgorithmParameterSpec iv; byte[] buf = new byte[1024]; BlockCrypt(String keyStr, String ivStr, String algorithm, String mode) { try { ecipher = Cipher.getInstance(algorithm + "/" + mode + "/PKCS5Padding"); dcipher = Cipher.getInstance(algorithm + "/" + mode + "/PKCS5Padding"); keyBytes = hexStringToByteArray(keyStr); ivBytes = hexStringToByteArray(ivStr); key = new SecretKeySpec(keyBytes, algorithm); iv = new IvParameterSpec(ivBytes); ecipher.init(Cipher.ENCRYPT_MODE, key, iv); dcipher.init(Cipher.DECRYPT_MODE, key, iv); } catch (Exception e) { System.err.println(e.getMessage()); } } public void encrypt(InputStream in, OutputStream out) { try { // out: where the plaintext goes to become encrypted out = new CipherOutputStream(out, ecipher); // in: where the plaintext comes from int numRead = 0; while ((numRead = in.read(buf)) &gt;= 0) { out.write(buf, 0, numRead); } out.close(); } catch (IOException e) { System.err.println(e.getMessage()); } } public void decrypt(InputStream in, OutputStream out) { try { // in: where the plaintext come from, decrypted on-the-fly in = new CipherInputStream(in, dcipher); // out: where the plaintext goes int numRead = 0; while ((numRead = in.read(buf)) &gt;= 0) { out.write(buf, 0, numRead); } out.flush(); out.close(); } catch (IOException e) { System.err.println(e.getMessage()); } } public static byte[] hexStringToByteArray(String s) { int len = s.length(); byte[] data = new byte[len / 2]; for (int i = 0; i &lt; len; i += 2) { data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) &lt;&lt; 4) + Character.digit(s.charAt(i+1), 16)); } return data; } } </code></pre> <p>cryptTest.java: </p> <pre><code>package nsdl.crypto; import nsdl.crypto.BlockCrypt; public class cryptTest { public static void main (String args[]) { if (args.length != 5) { System.err.println("Usage: cryptTest (encrypt|decrypt) key iv algorithm mode"); System.err.println("Takes input from STDIN. Output goes to STDOUT."); } else { String operation = args[0]; String key = args[1]; String iv = args[2]; String algorithm = args[3]; String mode = args[4]; BlockCrypt blockCrypt = new BlockCrypt(key, iv, algorithm, mode); if (operation.equalsIgnoreCase("encrypt")) { blockCrypt.encrypt(System.in, System.out); } else if (operation.equalsIgnoreCase("decrypt")) { blockCrypt.decrypt(System.in, System.out); } else { System.err.println("Invalid operation. Use (encrypt|decrypt)."); } } } } </code></pre>
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      1. POCan you figure out why this program is triggering a IllegalStateException?
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      1. POCan you figure out why this program is triggering a IllegalStateException?
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    1. COIt might help to know where the exception is thrown.
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      1. POCan you figure out why this program is triggering a IllegalStateException?
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    2. COIt says where it's thrown: at nsdl.crypto.BlockCrypt.encrypt(cryptTest)
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      1. POCan you figure out why this program is triggering a IllegalStateException?
      1. USRay
 

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