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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 156 | jmachado | 1 | package jomm.utils; |
| 2 | |||
| 3 | import javax.crypto.Cipher; |
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| 1827 | jmachado | 4 | import javax.crypto.IllegalBlockSizeException; |
| 156 | jmachado | 5 | import javax.crypto.SecretKey; |
| 6 | import javax.crypto.spec.SecretKeySpec; |
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| 7 | import java.io.UnsupportedEncodingException; |
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| 8 | |||
| 9 | /** |
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| 10 | * @author Jorge Machado |
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| 11 | * @date 20/Mai/2008 |
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| 12 | * @see jomm.utils |
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| 13 | */ |
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| 14 | public class DesUtils |
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| 15 | { |
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| 16 | static 1.5.0/docs/api/javax/crypto/Cipher.html">Cipher ecipher; |
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| 17 | static 1.5.0/docs/api/javax/crypto/Cipher.html">Cipher dcipher; |
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| 18 | |||
| 19 | static 1.5.0/docs/api/javax/crypto/SecretKey.html">SecretKey key; |
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| 20 | |||
| 21 | |||
| 22 | public static byte[] addParity(byte[] in) { |
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| 23 | byte[] result = new byte[8]; |
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| 24 | |||
| 25 | // Keeps track of the bit position in the result |
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| 26 | int resultIx = 1; |
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| 27 | |||
| 28 | // Used to keep track of the number of 1 bits in each 7-bit chunk |
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| 29 | int bitCount = 0; |
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| 30 | |||
| 31 | // Process each of the 56 bits |
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| 32 | for (int i=0; i<56; i++) { |
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| 33 | // Get the bit at bit position i |
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| 34 | boolean bit = (in[6-i/8]&(1<<(i%8))) > 0; |
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| 35 | |||
| 36 | // If set, set the corresponding bit in the result |
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| 37 | if (bit) { |
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| 38 | result[7-resultIx/8] |= (1<<(resultIx%8))&0xFF; |
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| 39 | bitCount++; |
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| 40 | } |
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| 41 | |||
| 42 | // Set the parity bit after every 7 bits |
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| 43 | if ((i+1) % 7 == 0) { |
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| 44 | if (bitCount % 2 == 0) { |
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| 45 | // Set low-order bit (parity bit) if bit count is even |
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| 46 | result[7-resultIx/8] |= 1; |
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| 47 | } |
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| 48 | resultIx++; |
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| 49 | bitCount = 0; |
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| 50 | } |
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| 51 | resultIx++; |
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| 52 | } |
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| 53 | return result; |
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| 54 | } |
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| 55 | |||
| 56 | // Get the 56-bit value |
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| 57 | |||
| 58 | |||
| 59 | private static DesUtils desUtils; |
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| 60 | |||
| 61 | private DesUtils() |
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| 62 | { |
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| 63 | try { |
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| 64 | byte[] raw = new byte[]{0x01, 0x72, 0x43, 0x3E, 0x1C, 0x7A, 0x55}; |
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| 65 | byte[] keyBytes = addParity(raw); |
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| 66 | key = new 1.5.0/docs/api/javax/crypto/spec/SecretKeySpec.html">SecretKeySpec(keyBytes, "DES"); |
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| 67 | ecipher = 1.5.0/docs/api/javax/crypto/Cipher.html">Cipher.getInstance("DES"); |
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| 68 | dcipher = 1.5.0/docs/api/javax/crypto/Cipher.html">Cipher.getInstance("DES"); |
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| 69 | ecipher.init(1.5.0/docs/api/javax/crypto/Cipher.html">Cipher.ENCRYPT_MODE, key); |
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| 70 | dcipher.init(1.5.0/docs/api/javax/crypto/Cipher.html">Cipher.DECRYPT_MODE, key); |
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| 71 | |||
| 72 | } catch (javax.crypto.1.5.0/docs/api/javax/crypto/NoSuchPaddingException.html">NoSuchPaddingException e) { |
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| 73 | e.printStackTrace(); |
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| 74 | } catch (java.security.1.5.0/docs/api/java/security/NoSuchAlgorithmException.html">NoSuchAlgorithmException e) { |
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| 75 | e.printStackTrace(); |
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| 76 | } catch (java.security.5+0%2Fdocs%2Fapi+InvalidKeyException">InvalidKeyException e) { |
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| 77 | e.printStackTrace(); |
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| 78 | } |
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| 79 | } |
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| 80 | |||
| 81 | public static DesUtils getInstance() |
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| 82 | { |
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| 83 | if(desUtils == null) |
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| 84 | desUtils = new DesUtils(); |
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| 85 | return desUtils; |
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| 86 | } |
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| 87 | |||
| 1827 | jmachado | 88 | |
| 89 | /*public String encrypt(String str) { |
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| 156 | jmachado | 90 | try { |
| 91 | // Encode the string into bytes using utf-8 |
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| 92 | byte[] utf8 = str.getBytes("UTF8"); |
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| 93 | |||
| 94 | // Encrypt |
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| 95 | byte[] enc = ecipher.doFinal(utf8); |
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| 96 | |||
| 97 | // Encode bytes to base64 to get a string |
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| 98 | return new sun.misc.BASE64Encoder().encode(enc); |
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| 99 | } catch (javax.crypto.BadPaddingException e) { |
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| 100 | } catch (IllegalBlockSizeException e) { |
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| 101 | } catch (UnsupportedEncodingException e) { |
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| 102 | } catch (java.io.IOException e) { |
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| 103 | } |
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| 104 | return null; |
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| 1827 | jmachado | 105 | }*/ |
| 106 | |||
| 107 | /** |
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| 108 | * only for JAVA8 |
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| 109 | * @param str |
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| 110 | * @return |
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| 111 | */ |
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| 112 | public 1.5.0/docs/api/java/lang/String.html">String encrypt(1.5.0/docs/api/java/lang/String.html">String str) { |
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| 113 | try { |
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| 114 | // Encode the string into bytes using utf-8 |
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| 115 | byte[] utf8 = str.getBytes("UTF8"); |
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| 116 | |||
| 117 | // Encrypt |
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| 118 | byte[] enc = ecipher.doFinal(utf8); |
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| 119 | |||
| 120 | // Encode bytes to base64 to get a string |
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| 121 | return java.util.Base64.getEncoder().encodeToString(enc); |
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| 122 | } catch (javax.crypto.1.5.0/docs/api/javax/crypto/BadPaddingException.html">BadPaddingException e) { |
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| 123 | } catch (1.5.0/docs/api/javax/crypto/IllegalBlockSizeException.html">IllegalBlockSizeException e) { |
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| 124 | } catch (1.5.0/docs/api/java/io/UnsupportedEncodingException.html">UnsupportedEncodingException e) { |
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| 125 | } catch (java.io.1.5.0/docs/api/java/io/IOException.html">IOException e) { |
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| 126 | } |
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| 127 | return null; |
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| 156 | jmachado | 128 | } |
| 129 | |||
| 1827 | jmachado | 130 | /* public String decrypt(String str) { |
| 156 | jmachado | 131 | try { |
| 132 | // Decode base64 to get bytes |
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| 133 | byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str); |
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| 134 | |||
| 135 | // Decrypt |
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| 136 | byte[] utf8 = dcipher.doFinal(dec); |
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| 137 | |||
| 138 | // Decode using utf-8 |
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| 139 | return new String(utf8, "UTF8"); |
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| 140 | } catch (javax.crypto.BadPaddingException e) { |
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| 141 | } catch (IllegalBlockSizeException e) { |
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| 142 | } catch (UnsupportedEncodingException e) { |
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| 143 | } catch (java.io.IOException e) { |
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| 144 | } |
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| 145 | return null; |
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| 1827 | jmachado | 146 | }*/ |
| 147 | |||
| 148 | /** |
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| 149 | * only JAVA 8 |
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| 150 | * @param str |
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| 151 | * @return |
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| 152 | */ |
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| 153 | public 1.5.0/docs/api/java/lang/String.html">String decrypt(1.5.0/docs/api/java/lang/String.html">String str) { |
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| 154 | try { |
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| 155 | // Decode base64 to get bytes |
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| 156 | byte[] dec = java.util.Base64.getDecoder().decode(str); |
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| 157 | |||
| 158 | // Decrypt |
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| 159 | byte[] utf8 = dcipher.doFinal(dec); |
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| 160 | |||
| 161 | // Decode using utf-8 |
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| 162 | return new 1.5.0/docs/api/java/lang/String.html">String(utf8, "UTF8"); |
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| 163 | } catch (javax.crypto.1.5.0/docs/api/javax/crypto/BadPaddingException.html">BadPaddingException e) { |
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| 164 | } catch (1.5.0/docs/api/javax/crypto/IllegalBlockSizeException.html">IllegalBlockSizeException e) { |
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| 165 | } catch (1.5.0/docs/api/java/io/UnsupportedEncodingException.html">UnsupportedEncodingException e) { |
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| 166 | } catch (java.io.1.5.0/docs/api/java/io/IOException.html">IOException e) { |
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| 167 | } |
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| 168 | return null; |
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| 156 | jmachado | 169 | } |
| 170 | |||
| 171 | public static void main(1.5.0/docs/api/java/lang/String.html">String[] args) |
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| 172 | { |
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| 173 | 1.5.0/docs/api/java/lang/String.html">String code = DesUtils.getInstance().encrypt("jorge machado"); |
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| 174 | 1.5.0/docs/api/java/lang/System.html">System.out.println(code); |
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| 175 | 1.5.0/docs/api/java/lang/System.html">System.out.println(DesUtils.getInstance().decrypt(code)); |
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| 176 | } |
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| 177 | } |