ECDSA Android使用公钥验证始终返回false

Question

我有一些令牌，我需要首先与SHA256和ECDSA基于私钥和公钥从KeyStore签名。

每次我尝试验证值时，结果都是false。我不知道为什么。

有人知道怎么解决这个问题吗？

下面是我生成和加载密钥的函数：

private void generateKeys(){

    try {

        keyStore = KeyStore.getInstance(KEYSTORE_NAME);
        keyStore.load(null);

        if(!keyStore.containsAlias(KEY_NAME)) {
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(KeyProperties.KEY_ALGORITHM_EC, KEYSTORE_NAME);
            keyPairGenerator.initialize(
                    new KeyGenParameterSpec.Builder(KEY_NAME,
                            KeyProperties.PURPOSE_SIGN | KeyProperties.PURPOSE_VERIFY)
                            .setDigests(KeyProperties.DIGEST_SHA256,
                                    KeyProperties.DIGEST_SHA512)
                            .setAlgorithmParameterSpec(new ECGenParameterSpec("secp256r1"))
                            .setUserAuthenticationRequired(false)
                            .build());
            keyPairGenerator.generateKeyPair();

            setRegistred(true);
        }
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (NoSuchProviderException e) {
        e.printStackTrace();
    } catch (InvalidAlgorithmParameterException e) {
        e.printStackTrace();
    } catch (CertificateException e) {
        e.printStackTrace();
    } catch (KeyStoreException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}



private void loadKeys(){
    try {
        keyStore = KeyStore.getInstance(KEYSTORE_NAME);
        keyStore.load(null);
        if(keyStore.containsAlias(KEY_NAME)) {
            publicKey = keyStore.getCertificate(KEY_NAME).getPublicKey();
            privateKey = (PrivateKey) keyStore.getKey(KEY_NAME, null);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (CertificateException e) {
        e.printStackTrace();
    } catch (KeyStoreException e) {
        e.printStackTrace();
    } catch (UnrecoverableKeyException e) {
        e.printStackTrace();
    }
}

这就是符号值的含义：

 public String sign(String inputStr, FingerprintManager.CryptoObject cryptoObject){
    try {
        Signature signature = Signature.getInstance(SecurityConstants.SIGNATURE);
        signature.initSign(privateKey);
        signature.update(inputStr.getBytes());
        byte[] signedBytes = signature.sign();
        String result = Base64.encodeToString(signedBytes, Base64.DEFAULT);
        Log.d("TAG", result);
        return result;
    } catch (SignatureException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    return null;
}

以下是我尝试使用公钥进行验证的步骤：

public boolean verifyWithPublicKey(String input, FingerprintManager.CryptoObject cryptoObject){
    try {
        Signature signature = Signature.getInstance(SecurityConstants.SIGNATURE);
        keyStore = KeyStore.getInstance(KEYSTORE_NAME);
        keyStore.load(null);
        PublicKey pk  = getPublicKeyForVerification();
        signature.initVerify(pk);
        signature.update(input.getBytes());
        boolean isVerifed = signature.verify(input.getBytes());
        Log.d("TAG", String.valueOf(isVerifed));
        return isVerifed;
    } catch (SignatureException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    } catch (CertificateException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (KeyStoreException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return false;
}

Answer 1

当您编写以下代码来验证签名时，错误在此处：

signature.update(input.getBytes());
boolean isVerifed = signature.verify(input.getBytes());

使用此代码，您可以尝试验证签名是否已与自身签名！

你应该有：

signature.update(MY_BYTES_ARRAY_OF_DATA);
boolean isVerifed = signature.verify(MY_SIGNATURE);

不要忘记，默认情况下，签名不会封装已签名的数据。

如果您想要包含签名数据和相关签名的格式，请使用S/MIME、OpenPGP等。