Android Decryption Error

Question

I am trying to encrypt and decrypt Strings in my Android application but I keep getting an InvalidKeyException error.

Here is my code:

//Generate Keys method

Answer 1

Removing the provider worked for me:

Cipher.getInstance("RSA/ECB/PKCS1Padding")

From Java docs: "This method traverses the list of registered security Providers, starting with the most preferred Provider. A new Cipher object encapsulating the CipherSpi implementation from the first Provider that supports the specified algorithm is returned."

Answer 2

Try using a different provider, like this:

Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidKeyStoreBCWorkaround");

Answer 3

this worked for me:

private Cipher getCipher() {
    try {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) { // below android m
            return Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidOpenSSL"); // error in android 6: InvalidKeyException: Need RSA private or public key
        }
        else { // android m and above
            return Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidKeyStoreBCWorkaround"); // error in android 5: NoSuchProviderException: Provider not available: AndroidKeyStoreBCWorkaround
        }
    } catch(Exception exception) {
        throw new RuntimeException("getCipher: Failed to get an instance of Cipher", exception);
    }
}