小编wd3*_*dui的帖子

我目前正在开发我的加密软件的 Android 客户端，但我一直收到IllegalBlockSizeException，并且e.getMessage()总是返回null

这是我用来查找问题的代码

try {
    KeyPairGenerator generator = KeyPairGenerator.getInstance(KeyProperties.KEY_ALGORITHM_RSA,"AndroidKeyStore");
    generator.initialize(new KeyGenParameterSpec.Builder(
            "1",
            KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)
            .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_OAEP)
            .setDigests(KeyProperties.DIGEST_SHA256)
            .setKeySize(2048)
            .build());
    KeyPair kp = generator.generateKeyPair();

    KeyStore store = KeyStore.getInstance("AndroidKeyStore");
    store.load(null);
    PublicKey pubKey = store.getCertificate("1").getPublicKey();
    PrivateKey privkey = ((KeyStore.PrivateKeyEntry) store.getEntry("1",null)).getPrivateKey();

    byte[] content = "123456789".getBytes();
    Cipher encrypt = Cipher.getInstance("RSA/ECB/OAEPWithSHA-256AndMGF1Padding");
    encrypt.init(Cipher.ENCRYPT_MODE,pubKey);
    Cipher decrypt = Cipher.getInstance("RSA/ECB/OAEPWithSHA-256AndMGF1Padding");
    decrypt.init(Cipher.DECRYPT_MODE,privkey);

    byte[] A = encrypt.doFinal(content);
    byte[] B = decrypt.doFinal(A);

    String resultA = new String(A);
    String resultB = new String(B);
    Toast.makeText(getApplicationContext(), resultA + "\n" + …