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PODecryption result using RSA differs in plain Java and Android
 

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  1. PODecryption result using RSA differs in plain Java and Android
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    <p>I encrypt/decrypt a message like the following: Encrypt string -> base64 encode bytes -> serialize string -> deserialize string -> decode b64 -> decrypt bytes.</p> <p>The encryption looks like this:</p> <pre><code>PublicKey pubKey = readPublicKey(); Cipher cipher; cipher = Cipher.getInstance(CRYPTO_ALG); cipher.init(Cipher.ENCRYPT_MODE, pubKey); byte[] cipherData; cipherData = cipher.doFinal(message.getBytes()); return cipherData; </code></pre> <p>Decryption is done like so:</p> <pre><code>PrivateKey pk = readPrivateKey(); Cipher cipher = Cipher.getInstance(CRYPTO_ALG); cipher.init(Cipher.DECRYPT_MODE, pk); return new String(cipher.doFinal(data)); </code></pre> <p>The keys are read like this:</p> <pre><code>ObjectInputStream oin = new ObjectInputStream(new BufferedInputStream(is)); BigInteger m = (BigInteger) oin.readObject(); BigInteger e = (BigInteger) oin.readObject(); RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(m, e); KeyFactory fact = KeyFactory.getInstance("RSA"); PrivateKey privKey = fact.generatePrivate(keySpec); return privKey; </code></pre> <p>I have omitted the b64 stuff here, but I have verified that the problem does not affect that code.</p> <p>What happens now is that I actually get the correct answer, but it is prepended with binary gibberish. If I encrypt "TESTDATA", I will get TESTDATA. The code works fine in plain Java, but fails in Android. Does anyone know how to fix this? </p> <p>EDIT: Encrypting/decrypting using RSA/NONE/NoPadding does not seem to help. I also use org.bouncycastle in the plain JRE.</p>
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    1. USnavlelo
    1. USnavlelo
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    1. COCan this help? http://stackoverflow.com/questions/10306560/android-jvm-difference-in-rsa-decryption
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    2. COhttp://stackoverflow.com/questions/7787328/rsa-encrypt-and-decrypt-strings-on-android
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      1. USAli Imran
    3. CO@Milos: That seems very plausible, however when I encrypt/decrypt using "RSA/NONE/NoPadding" it does not work. The output is all gibberish. Am I missing something? Do I have to change something when generating the keys?
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      1. USnavlelo
 

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