Solved: I used the signum for specify that the number is positive, and now
it works.
new RSAPublicKeySpec(new BigInteger(1, modulusBytes), new BigInteger(1,
exponentBytes));
Il giorno giovedì 28 maggio 2015 15:34:57 UTC+2, Fabio Scubla ha scritto:
>
> I have an error with decryption with RSA.
> The code works on android 4.4 kit kat, but the same app doesn't work on
> android 5.0 lollipop.
>
> KeyFactory keyFactory = KeyFactory.getInstance("RSA");
> RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger(
> modulusBytes), new BigInteger(exponentBytes));
> RSAPublicKey publicKey = (RSAPublicKey) keyFactory.generatePublic(
> pubKeySpec);
>
> byte[] decrypted = null;
> try {
> // get an RSA cipher object and print the provider
> final Cipher cipher = Cipher.getInstance("RSA/None/NoPadding");
>
> // decrypt the text using the public key
> cipher.init(Cipher.DECRYPT_MODE, publicKey);
> decrypted = cipher.doFinal(area_fissa_byte);
>
> } catch (Exception ex) {
> ex.printStackTrace();
> Log.d("error","error");
> }
>
> The error is: *java.security.SignatureException: error:04067084:rsa
> routines:RSA_EAY_PUBLIC_DECRYPT:data too large for modulus*.
>
> My sdk target is:
> `<uses-sdk
> android:minSdkVersion="14"
> android:targetSdkVersion="19" />` for android 4.4
>
> Do you know what is the problem?
>
> i notice that i have 2 different public keys with different lengths!!!
>
> - Android 5: i have 382/383 bit (too small)
>
>
> - Android 4.4: i have 384 bit (ok)
>
>
> i found that there are differences with android 5.0 for TLS/SSL:
> https://developer.android.com/about/versions/android-5.0-changes.html
> But i don't know how to fix the problem.
>
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