Question

我试图将RSA公钥从PHP发送到Java（Android）。我的PHP代码看起来像这样：

function __construct() {
        $rsa = new Crypt_RSA();
        $rsa->setHash('sha1');
        $rsa->setMGFHash('sha1');
        $rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_OAEP);
        $rsa->setPrivateKeyFormat(CRYPT_RSA_PRIVATE_FORMAT_PKCS1);
        $rsa->setPublicKeyFormat(CRYPT_RSA_PUBLIC_FORMAT_PKCS1);

        // Code to Generate the public key and private key

        $keys = $rsa->createKey(1024);

        extract($keys);

        // Base 64 encode Public and Private key
        $this->rsa = $rsa;
        $this->keys = $keys;
        $this->publicKeyBase = base64_encode($publickey);
        $this->privateKeyBase = base64_encode($privatekey);
}

我将$this->publicKeyBase发送到我的Android应用。在Java中，我得到了这样的编码字符串：

LS0tLS1CRUdJTiBSU0EgUFVCTElDIEtFWS0tLS0tDQpNSUdKQW9HQkFMQzluUkdhVGsybzlJTW5YVW0vWWRVMHMrTFplc09GUi9VYkU2K21hWDlwbGIwRW11RzZacHBMDQpoV2dRbUNBYmV6aW9ScHZNL0lVZHZWczZ6ZmFKaDRGTnFaRXo0cWd0V0ovaFpUU2RudlFIMlI3cWF0TEY0c0ZSDQpDbWNNVDZBdnYvdDJnR1liMW4vY1lhb01ralNOd1RFdTJBSU45djg0Skk2ZWhmOGNST0RMQWdNQkFBRT0NCi0tLS0tRU5EIFJTQSBQVUJMSUMgS0VZLS0tLS0=

解码后，它看起来像这样：

如何将其转换为可在Android App中使用的公钥。在网上看过很多例子，但它们不起作用，我的java代码（下面）似乎也不起作用。任何可能的解决方案？

private static PublicKey getPublicKeyFromPemFormat(String PEMString, boolean isFilePath) throws IOException, NoSuchAlgorithmException,
            InvalidKeySpecException {

        BufferedReader pemReader = null;
        if (isFilePath) {
            pemReader = new BufferedReader(new InputStreamReader(
                    new FileInputStream(PEMString)));
        } else {
            pemReader = new BufferedReader(new InputStreamReader(
                    new ByteArrayInputStream(PEMString.getBytes("UTF-8"))));
        }
        StringBuffer content = new StringBuffer();
        String line = null;

        while ((line = pemReader.readLine()) != null) {
            if (line.indexOf("-----BEGIN RSA PUBLIC KEY-----") != -1) {
                while ((line = pemReader.readLine()) != null) {
                    if (line.indexOf("-----END RSA PUBLIC KEY-----") != -1) {
                        break;
                    }
                    content.append(line.trim());
                }
                break;
            }
        }
        if (line == null) {
            throw new IOException("PUBLIC KEY" + " not found");
        }
        Log.i("PUBLIC KEY: ", "PEM content = : " + content.toString());

        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        return keyFactory.generatePublic(new X509EncodedKeySpec(Base64.decode(content.toString(), Base64.DEFAULT)));

    }

new X509EncodedKeySpec(Base64.decode(content.toString(), Base64.DEFAULT)) throws an Invalid KeySpec Exception.

Answer 1

文档有点令人困惑，但从第950行开始查看source code方法_convertPublicKey($n, $e)，看来如果$publicKeyFormat == PUBLIC_FORMAT_PKCS8那么输出格式应该是兼容的格式使用Java的X509EncodedKeySpec类。

在PHP中将CRYPT_RSA_PUBLIC_FORMAT_PKCS1从php转换为RSA公钥

1 个答案: