相关疑难解决方法(0)

我通常会在这里找到大部分问题的答案,但这次我需要问:-).

我们在Android 8.0(API级别26)上运行的某个应用程序中遇到了RSA加密/解密问题.

我们一直在使用带有"RSA/ECB/OAEPWithSHA-256AndMGF1Padding"的RSA,它适用于Android 7.1以上的所有版本.在调用Cipher.doFinal()时,在Android 8.0上运行的相同代码会抛出IllegalBlocksizeException.

以下是重现问题的代码:

private KeyStore mKeyStore;

private static final String KEY_ALIAS = "MyKey";
void testEncryption() throws NoSuchProviderException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, KeyStoreException, IOException, CertificateException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException, UnrecoverableEntryException, NoSuchPaddingException {

    mKeyStore = KeyStore.getInstance("AndroidKeyStore");
    mKeyStore.load(null);

    // Generate Key Pair -------------------------------------
    KeyPairGenerator kpg = KeyPairGenerator.getInstance(KeyProperties.KEY_ALGORITHM_RSA, "AndroidKeyStore");
    kpg.initialize(new KeyGenParameterSpec.Builder(
            KEY_ALIAS,
            KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)
            .setDigests(KeyProperties.DIGEST_SHA256, KeyProperties.DIGEST_SHA512)
            .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP)
            .setKeySize(2048)
            .build());
    KeyPair kp = kpg.generateKeyPair();

    // Encrypt -----------------------------------------------
    KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry)mKeyStore.getEntry(KEY_ALIAS, null);
    PublicKey publicKey = (PublicKey) privateKeyEntry.getCertificate().getPublicKey();
    Cipher cipher = Cipher.getInstance("RSA/ECB/OAEPWithSHA-256AndMGF1Padding");
    cipher.init(Cipher.ENCRYPT_MODE, publicKey); …