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POAES ECB mode encrypt in java and decrypt in ruby
 

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  1. POAES ECB mode encrypt in java and decrypt in ruby
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    <p>I have to encryption method which write in java. My encryption java code:</p> <pre><code>public static String encrypt(String content, String sKey) { try { SecretKey secretKey = null; KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG"); secureRandom.setSeed(sKey.getBytes()); kgen.init(128, secureRandom); secretKey = kgen.generateKey(); byte[] enCodeFormat = secretKey.getEncoded(); SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, key); byte[] byteContent = content.getBytes("utf-8"); byte[] result = cipher.doFinal(byteContent); return ByteUtil.parseByte2HexStr(result); } catch (Exception e) { e.printStackTrace(); } return content; } ## ByteUtil.java ... public static String parseByte2HexStr(byte buf[]) { StringBuffer sb = new StringBuffer(); for (int i = 0; i &lt; buf.length; i++) { String hex = Integer.toHexString(buf[i] &amp; 0xFF); if (hex.length() == 1) { hex = '0' + hex; } sb.append(hex.toUpperCase()); } return sb.toString(); } </code></pre> <p><strong>My ruby decryption code (not work):</strong> </p> <pre><code>require "openssl" require 'digest/sha2' require 'base64' def decryption(encrypted, key) decipher = OpenSSL::Cipher::AES.new(128, :ECB) decipher.decrypt decipher.padding = 0 decipher.key = [key].pack('H*') encrypted = [encrypted].pack('H*') plain = decipher.update(encrypted) + decipher.final p plain p plain.unpack('s*') p plain.unpack('m*') p plain.unpack('u*') p plain.unpack('h*') p plain.unpack('a*') end </code></pre> <p>Anyone can help? thanks in advance!!!</p> <p>when I use 'ef3192c8803a47cb829d487dd2f78a3d' as key, and encrypt 'helloworld' with my java code, I get '3CAEF382FB17A045EADDEFC72D3D0362', But when I try use my ruby code to decrypt it, I call</p> <pre><code>decryption('3CAEF382FB17A045EADDEFC72D3D0362', 'ef3192c8803a47cb829d487dd2f78a3d') </code></pre> <p>I can't get 'helloworld', So I think the decryption code is not work.</p> <p><strong>Java decryption code( it's works)</strong></p> <pre><code>public static String decrypt(String content, String sKey) { try { SecretKey secretKey = null; KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG"); secureRandom.setSeed(sKey.getBytes()); kgen.init(128, secureRandom); secretKey = kgen.generateKey(); byte[] data = ByteUtil.parseHexStr2Byte(content); byte[] enCodeFormat = secretKey.getEncoded(); SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, key); byte[] result = cipher.doFinal(data); return new String(result, "UTF-8"); } catch (Exception e) { e.printStackTrace(); } return content; } </code></pre>
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    1. COYou need to be a lot more specific than "not work".
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    2. COIn particular, you need to show the input to your Java code, its output, and what the deciphered output from the Ruby code is. Off the top of my head, I note that you're not setting a mode for the Java code (default is implementation-dependent), and you're disabling padding on the Ruby side when it's enabled on the Java side. Also, you're printing the hex representation of the encrypted bytes on the Java side but haven't shown any Ruby code where you're unpacking the hex string back into a byte array.
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    3. CO@chrylis, thanks for your help, I think java AES default use ECB mode
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