Merge "Fixing engineGetCertificateChain exception"

package android.security.keystore;

import libcore.util.EmptyArray;

import android.security.Credentials;

import android.security.GateKeeper;

import android.security.KeyStore;

import android.security.keystore.WrappedKeyEntry;

import android.util.Log;

import libcore.util.EmptyArray;

import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.io.InputStream;

        final Certificate[] caList;

        final byte[] caBytes = mKeyStore.get(Credentials.CA_CERTIFICATE + alias, mUid);

        // Suppress the key not found warning for this call. It seems that this error is exclusively

        // being thrown when there is a self signed certificate chain, so when the keystore service

        // attempts to query for the CA details, it obviously fails to find them and returns a

        // key not found exception. This is WAI, and throwing a stack trace here can be very

        // misleading since the trace is not clear.

        final byte[] caBytes = mKeyStore.get(Credentials.CA_CERTIFICATE + alias,

                                             mUid,

                                             true /* suppressKeyNotFoundWarning */);

        if (caBytes != null) {

            final Collection<X509Certificate> caChain = toCertificates(caBytes);