Cryptography Tutorials - Herong's Tutorial Examples - v5.42, by Herong Yang
JCE DES Stream Ciphers Testing Program
This section provides a tutorial example on how to use DES stream ciphers provided in the JDK JCE package.
To test out JCE DES stream cipher mode implementation, I wrote the following testing program:
/* JceSunDesStreamCipherTest.java * Copyright (c) HerongYang.com. All Rights Reserved. */ import java.security.spec.*; import javax.crypto.*; import javax.crypto.spec.*; class JceSunDesStreamCipherTest { public static void main(String[] a) { if (a.length<1) { System.out.println("Usage:"); System.out.println( "java JceSunDesStreamCipherTest 1/2/3/4"); return; } String test = a[0]; try { byte[] theKey = null; byte[] theIVp = null; byte[] theMsg = null; byte[] theExp = null; String algorithm = null; if (test.equals("1")) { algorithm = "DES/CFB8/NoPadding"; theKey = hexToBytes("0123456789ABCDEF"); theIVp = hexToBytes("1234567890ABCDEF"); theMsg = hexToBytes("4E6F7720697320746865"); // "Now is the" theExp = hexToBytes("F31FDA07011462EE187F"); } else if (test.equals("2")) { algorithm = "DES/CFB64/NoPadding"; theKey = hexToBytes("0123456789ABCDEF"); theIVp = hexToBytes("1234567890ABCDEF"); theMsg = hexToBytes( "4E6F77206973207468652074696D6520666F7220616C6C20"); // "Now is the time for all " theExp = hexToBytes( "F3096249C7F46E51A69E839B1A92F78403467133898EA622"); } else if (test.equals("3")) { algorithm = "DES/OFB8/NoPadding"; theKey = hexToBytes("0123456789ABCDEF"); theIVp = hexToBytes("1234567890ABCDEF"); theMsg = hexToBytes("4E6F7720697320746865"); // "Now is the" theExp = hexToBytes("F34A2850C9C64985D684"); } else if (test.equals("4")) { algorithm = "DES/OFB64/NoPadding"; theKey = hexToBytes("0123456789ABCDEF"); theIVp = hexToBytes("1234567890ABCDEF"); theMsg = hexToBytes( "4E6F77206973207468652074696D6520666F7220616C6C20"); // "Now is the time for all " theExp = hexToBytes( "F3096249C7F46E5135F24A242EEB3D3F3D6D5BE3255AF8C3"); } else { System.out.println("Wrong option. For help enter:"); System.out.println("java JceSunDesStreamCipherTest"); return; } KeySpec ks = new DESKeySpec(theKey); SecretKeyFactory kf = SecretKeyFactory.getInstance("DES"); SecretKey ky = kf.generateSecret(ks); Cipher cf = Cipher.getInstance(algorithm); if (theIVp == null) { cf.init(Cipher.ENCRYPT_MODE, ky); } else { AlgorithmParameterSpec aps = new IvParameterSpec(theIVp); cf.init(Cipher.ENCRYPT_MODE, ky, aps); } byte[] theCph = cf.doFinal(theMsg); System.out.println("Key : "+bytesToHex(theKey)); if (theIVp != null) { System.out.println("IV : "+bytesToHex(theIVp)); } System.out.println("Message : "+bytesToHex(theMsg)); System.out.println("Cipher : "+bytesToHex(theCph)); System.out.println("Expected: "+bytesToHex(theExp)); } catch (Exception e) { e.printStackTrace(); return; } }
public static byte[] hexToBytes(String str) { if (str==null) { return null; } else if (str.length() < 2) { return null; } else { int len = str.length() / 2; byte[] buffer = new byte[len]; for (int i=0; i<len; i++) { buffer[i] = (byte) Integer.parseInt( str.substring(i*2,i*2+2),16); } return buffer; } } public static String bytesToHex(byte[] data) { if (data==null) { return null; } else { int len = data.length; String str = ""; for (int i=0; i<len; i++) { if ((data[i]&0xFF)<16) str = str + "0" + java.lang.Integer.toHexString(data[i]&0xFF); else str = str + java.lang.Integer.toHexString(data[i]&0xFF); } return str.toUpperCase(); } } }
This program provides 4 tests: CFB8, CFB64, OFB8 and OFB64 with testing plaintext messages, keys and initial vectors used in FIPS81.
Table of Contents
Introduction to AES (Advanced Encryption Standard)
DES Algorithm - Illustrated with Java Programs
DES Algorithm Java Implementation
DES Algorithm - Java Implementation in JDK JCE
DES Encryption Operation Modes
Introducting DES Stream Cipher Modes
CFB (Cipher FeedBack) as a Stream Cipher
OFB (Output FeedBack) as a Stream Cipher
CFB and OFB Stream Ciphers Implemented in JCE
►JCE DES Stream Ciphers Testing Program
JCE DES Stream Ciphers Testing Program Result
PHP Implementation of DES - mcrypt
Blowfish - 8-Byte Block Cipher
Secret Key Generation and Management
Cipher - Secret Key Encryption and Decryption
RSA Implementation using java.math.BigInteger Class
Introduction of DSA (Digital Signature Algorithm)
Java Default Implementation of DSA
Private key and Public Key Pair Generation
PKCS#8/X.509 Private/Public Encoding Standards
Cipher - Public Key Encryption and Decryption
OpenSSL Introduction and Installation
OpenSSL Generating and Managing RSA Keys
OpenSSL Generating and Signing CSR
OpenSSL Validating Certificate Path
"keytool" and "keystore" from JDK
"OpenSSL" Signing CSR Generated by "keytool"
Migrating Keys from "keystore" to "OpenSSL" Key Files
Certificate X.509 Standard and DER/PEM Formats
Migrating Keys from "OpenSSL" Key Files to "keystore"