在AndroidKeystore中保存和检索KeyPair

我需要生成一个RSA 2018密钥对,然后将其保存并恢复(如果存在).

此刻,我有：

SecureRandom random = new SecureRandom();
RSAKeyGenParameterSpec spec = new RSAKeyGenParameterSpec(keySize, RSAKeyGenParameterSpec.F4);
KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "SC");
generator.initialize(spec, random);
return generator.generateKeyPair();

效果很好,但是现在我尝试保存并从Android Keystore中获取它,但是我没有实现.我尝试过：

String alias = "TESTINGKEY";
        KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
        keyStore.load(null);
        if (!keyStore.containsAlias(alias)) {
            SecureRandom random = new SecureRandom();
            RSAKeyGenParameterSpec spec = new RSAKeyGenParameterSpec(keySize, RSAKeyGenParameterSpec.F4);
            KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "SC");
            generator.initialize(spec, random);
            return generator.generateKeyPair();
        } else {
            Key key = keyStore.getKey(alias, null);
            if (key instanceof PrivateKey) {
                Certificate cert = keyStore.getCertificate(alias);
                return new KeyPair(cert.getPublicKey(), (PrivateKey) key);
            } else {
                return null;
            }
        }

但是工作不正常,因为在应用程序的第二次运行中,密钥库不包含密钥对.

在https://developer.android.com/training/articles/keystore.html?hl=es中,我看到了KeyGenParameterSpec,该构建器具有“别名”值,但int RSAKeyGenParameterSpec没有.

我该如何保存？

解决方法:

使用AndroidKeyStore需要使用KeyGenParameterSpec.Builder生成密钥.还要使用AndroidKeyStore而不是SC.您可以使用以下代码

生成密钥(Android> = 23)

KeyPairGenerator kpg = KeyPairGenerator.getInstance(
                KeyProperties.KEY_ALGORITHM_RSA, "AndroidKeyStore");

kpg.initialize(new KeyGenParameterSpec.Builder(
                alias,
                KeyProperties.PURPOSE_SIGN | KeyProperties.PURPOSE_VERIFY)
                .setDigests(KeyProperties.DIGEST_SHA256, KeyProperties.DIGEST_SHA512)
                .setKeySize(keySize)
                .build());

KeyPair keyPair = kpg.generateKeyPair();

加载按键

KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
keyStore.load(null);
KeyStore.Entry entry = keyStore.getEntry(alias, null);
PrivateKey privateKey = ((KeyStore.PrivateKeyEntry) entry).getPrivateKey();
PublicKey publicKey = keyStore.getCertificate(alias).getPublicKey();

标签：rsa,android-keystore,android
来源： https://codeday.me/bug/20191111/2022026.html