I receive from a web service(made by myself) an RSA PrivateKey PKCS#8 encoded in a base 64 String.
My Android app must save this key somewhere into the phone securely.
From the 4.3 version of Android, it's possible saving keys using the new KeyStore API.
I've found an article with code axample that shows how to generate a KeyPair with the Specification needed to store the keys. And after to recover the keys.
// generate a key pair
Context ctx = getContext();
Calendar notBefore = Calendar.getInstance()
Calendar notAfter = Calendar.getInstance();
notAfter.add(1, Calendar.YEAR);
KeyPairGeneratorSpec spec = new KeyPairGeneratorSpec.Builder(ctx)
.setAlias("key1")
.setSubject(
new X500Principal(String.format("CN=%s, OU=%s", alais,
ctx.getPackageName())))
.setSerialNumber(BigInteger.ONE).setStartDate(notBefore.getTime())
.setEndDate(notAfter.getTime()).build();
KeyPairGenerator kpGenerator = KeyPairGenerator.getInstance("RSA", "AndroidKeyStore");
kpGenerator.initialize(spec);
KeyPair kp = kpGenerator.generateKeyPair();
// in another part of the app, access the keys
KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
keyStore.load(null);
KeyStore.PrivateKeyEntry keyEntry = (KeyStore.PrivateKeyEntry)keyStore.getEntry("key1", null);
RSAPublicKey pubKey = (RSAPublicKey)keyEntry.getCertificate().getPublicKey();
RSAPrivateKey privKey = (RSAPrivateKey) keyEntry.getPrivateKey();
But i don't understand how can i save an existing key to it. Can anybody help me?
Thanks in advance
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