SubjectPublicKeyInfo/RSA translation from java to c#-CodePudding

How to translate the following java into C# for .Net Framework 4.8?

private static String getBearerToken(String publicKeyBase64, String apiKey)
{
    KeyFactory keyFactory = KeyFactory.getInstance("RSA");
    Cipher cipher = Cipher.getInstance("RSA");
    byte[] encodedPublicKey = Base64.decodeBase64(publicKeyBase64);
    X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(encodedPublicKey);
    PublicKey pk = keyFactory.generatePublic(publicKeySpec);

    cipher.init(Cipher.ENCRYPT_MODE, pk);

    byte[] encryptedApiKey = Base64.encodeBase64(cipher.doFinal(apiKey.getBytes("UTF-8")));

    return new String(encryptedApiKey, "UTF-8");
}

I'm fiddling with the following (with BouncyCastle package):

public static string GetBearerToken(string publicKeyBase64, string apiKey)
{
    var key = Convert.FromBase64String(publicKeyBase64);
    var info = SubjectPublicKeyInfo.GetInstance(key);
    var pk = PublicKeyFactory.CreateKey(info);
    var x = ???(pk);

    using (var rsa = new RSACryptoServiceProvider(???))
    {
        var parameters = new RSAParameters()
        {
            Modulus = x.???,
            Exponent = x.???
        };

        rsa.ImportParameters(parameters);

        var data = Encoding.UTF8.GetBytes(apiKey);
        var encryptedBytes = rsa.Encrypt(data, true);

        return Convert.ToBase64String(encryptedBytes);
    }
}

And here is the unit test I'm trying to get passing:

[TestMethod]
public void Utils_GetBearerToken()
{
    var publicKey = "MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAszE xAKVB9HRarr6/uHYYAX/RdD6KGVIGlHv98QKDIH26ldYJQ7zOuo9qEscO0M1psSPe/67AWYLEXh13fbtcSKGP6WFjT9OY6uV5ykw9508x1sW8UQ4ZhTRNrlNsKizE/glkBfcF2lwDXJGQennwgickWz7VN AP/1c4DnMDfcl8iVIDlsbudFoXQh5aLCYl XOMt/vls5a479PLMkPcZPOgMTCYTCE6ReX3KD2aGQ62uiu2T4mK 7Z6yvKvhPRF2fTKI zOFWly//IYlyB sde42cIU/588msUmgr3G9FYyN2vKPVy/MhIZpiFyVc3vuAAJ/mzue5p/G329wzgcz0ztyluMNAGUL9A4ZiFcKOebT6y6IgIMBeEkTwyhsxRHMFXlQRgTAufaO5hiR/usBMkoazJ6XrGJB8UadjH2m2 kdJIieI4FbjzCiDWKmuM58rllNWdBZK0XVHNsxmBy7yhYw3aAIhFS0fNEuSmKTfFpJFMBzIQYbdTgI28rZPAxVEDdRaypUqBMCq4OstCxgGvR3Dy1eJDjlkuiWK9Y9RGKF8HOI5a4ruHyLheddZxsUihziPF9jKTknsTZtF99eKTIjhV7qfTzxXq 8GGoCEABIyu26LZuL8X12bFqtwLAcjfjoB7HlRHtPszv6PJ0482ofWmeH0BE8om7VrSGxsCAwEAAQ==";
    var apiKey = "aaaab09uz9f3asdcjyk7els777ihmwv8";
    var expectedToken = "rfNjFso4uJbzhwl8E9vizqmHEuD7XDmPqfsRx1L62UoTmURGGLAGgJSl9lCPbgy03Q7NwozFYD4r9BFQY5QpvErHximBDU8HE25urVahm0HnB8VyCIobs684XGSN4GjdequePDrG6xUAxxpvmhqZRlGt1tUjUBeBg6kYqp4EnKHsiaBtvd0THGLZbefpT6UaShASQWYNiEPwEon5wtUMaDwnyQEazDu1H2ieN3r8cCVM3hsak59J/1MP07FQjdFbxdCLfA0DuxgpeKpvLs7WrA767WJSB1QZy7hcP1igSGRfd7Zrp6E7gIukdpC0DApqPKa4XsNTo2AMpG4AwiET2WeKvHn539gbwREXf79kZlYdFDCgTc0Zs7OfDx5ZXMCBKHOS/H3tVFJqXTfEfIF5LOzrFU5pPE0HeNBV0Q2vm8qRwQX0RijnvMOGpdcmXb0qoph4oy8Mj vjRfFRboMAafttDozBhRmWEmeBB3EjYASm1fToQp5ey6ltCiEt8rjL5PlexxB0u3u2LVJQcDzMVNiiq10t1xyw8qtc6BMOyrKVlIANWglRYOKr9saVBVvDFUcCfsghMjUTDeAwHom4A3cSDWmVlNF9Vs/WqCoUzjQCV0BFPDzeAUbQqt7h7OgFno/ D9n5j1eMro0aXbbHNx71u8YmgPJhdixzFhxM1Pw=";

    var token = Utils.GetBearerToken(publicKey, apiKey);

    Assert.AreEqual(expectedToken, token, "GetBearerToken");
}

CodePudding user response：

this project in github is a example of this usage https://github.com/RomuloSantanaFadami/fadamipay-autorizador-exemplo-rsa if you have a problem with a public key formating, try use StringBuilder to make her.

CodePudding user response：

I use like this

internal partial class Criptografia{ private string ChavePublica = String.Empty;

    public Criptografia()
    {
        //if (String.IsNullOrEmpty(PertoBus.Program.PublicKeyQrCode))
        //{
        StringBuilder chavePublica = new StringBuilder();
        chavePublica.AppendLine("-----BEGIN RSA PUBLIC KEY-----");
        chavePublica.AppendLine("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
        chavePublica.AppendLine("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
        chavePublica.AppendLine("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=");
        chavePublica.AppendLine("-----END RSA PUBLIC KEY-----");
        ChavePublica = chavePublica.ToString();
        //}
        //else
        //    ChavePublica = PertoBus.Program.PublicKeyQrCode;
    }

    public string RsaCriptografarComChavePublica(string pTexto)
    {
        var bytesToEncrypt = Encoding.UTF8.GetBytes(pTexto);

        var encryptEngine = new Pkcs1Encoding(new RsaEngine());

        using (var txtreader = new StringReader(ChavePublica.ToString()))
        {
            var keyParameter = (AsymmetricKeyParameter)new PemReader(txtreader).ReadObject();

            encryptEngine.Init(true, keyParameter);
        }

        var encrypted = Convert.ToBase64String(encryptEngine.ProcessBlock(bytesToEncrypt, 0, bytesToEncrypt.Length));
        return encrypted;
    }
}