68 lines
2.4 KiB
Java
68 lines
2.4 KiB
Java
package tools;
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import javax.crypto.Cipher;
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import javax.crypto.SecretKey;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.spec.PBEKeySpec;
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import javax.crypto.spec.PBEParameterSpec;
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import java.security.spec.KeySpec;
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import java.security.spec.AlgorithmParameterSpec;
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import java.io.UnsupportedEncodingException;
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public class Decrypter {
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Cipher ecipher;
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Cipher dcipher;
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// 8-byte Salt
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byte[] salt = {
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(byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
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(byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
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};
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// Iteration count
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int iterationCount = 19;
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public Decrypter() {
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try {
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// Create the key
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String passPhrase = "generate a key!";
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KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
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SecretKey key = SecretKeyFactory.getInstance(
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"PBEWithMD5AndDES").generateSecret(keySpec);
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ecipher = Cipher.getInstance(key.getAlgorithm());
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dcipher = Cipher.getInstance(key.getAlgorithm());
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// Prepare the parameter to the ciphers
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AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
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// Create the ciphers
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ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
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dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
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} catch (java.security.InvalidAlgorithmParameterException e) {
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} catch (java.security.spec.InvalidKeySpecException e) {
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} catch (javax.crypto.NoSuchPaddingException e) {
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} catch (java.security.NoSuchAlgorithmException e) {
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} catch (java.security.InvalidKeyException e) {
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}
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}
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public String decrypt(String str) {
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try {
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// Decode base64 to get bytes
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byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
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// Decrypt
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byte[] utf8 = dcipher.doFinal(dec);
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// Decode using utf-8
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return new String(utf8, "UTF8");
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} catch (javax.crypto.BadPaddingException e) {
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} catch (IllegalBlockSizeException e) {
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} catch (UnsupportedEncodingException e) {
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} catch (java.io.IOException e) {
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}
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return null;
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}
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}
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