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Month: May 2009
Decrypt Using Blowflish And Java
In my previous post (Encrypt Using Blowflish And Java), I talked about a way to encrypt using Blowfish in Java. To decrypt it back to its original string, use this method below. Again, part of this method’s code uses a secondary method that converts hexadecimal to binary. You can find it here.
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public static String decrypt(String key, String cipher) { Security.insertProviderAt(new org.bouncycastle.jce.provider.BouncyCastleProvider(), 3); String plain = null; byte[] cipherText = convertHexadecimal2Binary(cipher.getBytes()); try { SecretKeySpec blowfishKey = new SecretKeySpec(key.getBytes(), "Blowfish"); Cipher blowfishCipher = Cipher.getInstance("Blowfish", "BC"); blowfishCipher.init(Cipher.DECRYPT_MODE, (Key)blowfishKey); byte[] plainText = blowfishCipher.doFinal(cipherText); plain = new String(plainText); } catch (Exception e) { e.printStackTrace(); } return plain; } |
Encrypt Using Blowflish And Java
Blowfish is a symmetric block cipher that can be used as a drop-in replacement for DES or IDEA. It takes a variable-length key, from 32 bits to 448 bits, making it an ideal way for encryption purposes. Java supports Blowflish encryption in its API. Here is a method that will encrypt using Blowfish. Part of the code converts the string to be encrypted to byte[] array so this method uses a secondary method called convertBinary2Hexadecimal() which you can find here.
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public static String encrypt(String key, String plain) { Security.insertProviderAt(new org.bouncycastle.jce.provider.BouncyCastleProvider(), 3); byte[] plainText = plain.getBytes(); String cipher = null; try { SecretKeySpec blowfishKey = new SecretKeySpec(key.getBytes(), "Blowfish"); Cipher blowfishCipher = Cipher.getInstance("Blowfish", "BC"); blowfishCipher.init(Cipher.ENCRYPT_MODE, (Key)blowfishKey); byte[] cipherText = blowfishCipher.doFinal(plainText); cipher = convertBinary2Hexadecimal(cipherText); } catch (Exception e) { e.printStackTrace(); } return cipher; } |
