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PODecrypting Java 3DES ECB NoPadding encrypted value in PHP
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  1. PODecrypting Java 3DES ECB NoPadding encrypted value in PHP
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    copied!<p>I have a 3des encrypted hex string which I get from a server. When I decrypt it with Java ECB/NoPadding, I get the expected value, but when I try to decrypt it with PHP I am getting a different value. This is the PHP code:</p> <pre><code>&lt;?php $key = "428982f4658cfeb679bae2bf85ebcde9"; $input = "9CB39217A434F6339EF27C503B561342"; $encrypted_data = bin2hex( mcrypt_ecb(MCRYPT_3DES, pack("H*", $key), pack("H*", $input), MCRYPT_DECRYPT) ); ?&gt; </code></pre> <p>and part of the java code starting with main:</p> <pre><code>String input = "F414E86894D996F8658F9327C8EC786404192012174729"; String key = "05aa58f38a0883d1439750a2495d36ad"; byte2hex(doCryto("F414E86894D996F8658F9327C8EC7864", "05aa58f38a0883d1439750a2495d36ad", Cipher.DECRYPT_MODE)); public static byte[] doCryto(String data, String key, int CipherMode) throws Exception { byte result[]; try { byte data1[] = hex2byte(data); Key key1 = formDESKey(key); transformation = key1.getAlgorithm() + "/ECB/NoPadding"; Cipher c1 = Cipher.getInstance(transformation); c1.init(CipherMode, key1); result = c1.doFinal(data1); } catch (Exception e) { throw new Exception(e); } return result; } public static Key formDESKey(String key) throws Exception { short len = (short) ((key.length() / 2) * 8); return formDESKey(len, hex2byte(key)); } public static Key formDESKey(short keyLength, byte clearKeyBytes[]) throws Exception { Key key = null; switch (keyLength) { case 64: // '@' key = new SecretKeySpec(clearKeyBytes, "DES"); break; case 128: clearKeyBytes = concat(clearKeyBytes, 0, 128/8, clearKeyBytes, 0, getBytesLength((short) 64)); // fall through case 192: key = new SecretKeySpec(clearKeyBytes, "DESede"); break; } if (key == null) { throw new Exception("Unsupported DES key length: " + keyLength + " bits"); } else { return key; } } private static byte[] concat(byte array1[], int beginIndex1, int length1, byte array2[], int beginIndex2, int length2) { byte concatArray[] = new byte[length1 + length2]; System.arraycopy(array1, beginIndex1, concatArray, 0, length1); System.arraycopy(array2, beginIndex2, concatArray, length1, length2); return concatArray; } </code></pre> <p>Java results in: 31303031464646464646464646464646 <br/> While PHP results in: 411C689D687F2F118EA05BF234F4E582</p> <p>I don't know why PHP is getting a different value. Any help would be appreciated.<br/> Thanks.</p>
 

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