Merchant Unified API Param

Content

parameter name	required	type	description
appId	Yes	string	merchant APP ID, provided by BluePay
sign	Yes	string	RSA sign of param
param	Yes	string	request param content string

Example

{
    "appId": "123456",
    "sign": "abcdef",
    "param": "{}"
}

Descrption

1. appId is a fixed string, provided by BluePay;
2. According to the specific API document, construct the request param, format the request param into JSON, used as the value of param;
3. Use merchant RSA private key to sign param , the sign result used as the value of sign .

Appendix RSA using case(in Java)

Generate RSA key pair:

import java.security.*;
import java.util.Base64;

public class RsaGenerateKeyPair {
    public static void main(String[] args) throws NoSuchAlgorithmException {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(4096);
        KeyPair keyPair = keyPairGenerator.genKeyPair();

        PublicKey publicKey = keyPair.getPublic();
        byte[] publicKeyBytes = publicKey.getEncoded();
        String publicKeyBase64 = Base64.getEncoder().encodeToString(publicKeyBytes);
        System.out.println(publicKeyBase64);

        PrivateKey privateKey = keyPair.getPrivate();
        byte[] privateKeyBytes = privateKey.getEncoded();
        String privateKeyBase64 = Base64.getEncoder().encodeToString(privateKeyBytes);
        System.out.println(privateKeyBase64);
    }
}

RSA key length should be 4096

RSA public key should be provided to BluePay, and do not disclose to any other.

RSA private key is kept by merchant, and do not disclose to any other.

When the merchant calls the BluePay Open API, it uses the RSA private key to sign the request param, and the BluePay server uses the RSA public key provided by the merchant to verify the signature. If the verification fails, it will refuse to process the request.

key pair example

RSA public key:

MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAnFPgpmzqcKVGp1Ci/WUPzPkhBnojDwPDBFWbB6RBXKjU8Pdp+n9K7rA0ZP6BD19O4MMJwYxG9n7zf7/IboA+bFfW/jsBGi41g7wBafbJxBKXQeXsdE8aRw7BcvjrTbL6EVUn2kMci2d9BMPMsPHCyDmubVIVVN+0rxft0vw2R5jbD/kg7e0K4+ls505eY8KRv2rpLdElhyYoA+PpFGZ/84FhO0nCGTQZCz4dcIK9axZ8RXKpVZQUotBfbKzzYmC8FQU4MeQp5vTttyEudyO0/9PtZUEEg1sN217YZywHeS274031F8dDC7afD2iVTES1obIoqvwEnD9CDfSbmF0pwLvheLhdGyVnh3FmMvQeturf+cTYZotP7igToL1MkmTIlSJ2q2pzPNaz0dyBorxB28WlxCuPRZuRCNzhdz/H694ytymEpwqXUo5Vbcfe+QgVFKduhnYapY4Ntv8oSdsH2MeKb5dhc1sO+I0fqrIW25zUOH8ECWQbgV50I7QIPOhKuLOkZW/EEG2epwlY83HqNrKhH6Wd+DXEjimz9zRmCNRboA8MswN8TRv6vGnmP8rFbPiIl/pBADFViiF+TP08O2VWb/9RaXils0MJfhMvTZ6PjhScIKtX9q6wT28gHYIdBD5UfrKLPndJMxM9u3HzWYCwhxa4boxu2+3KLwd7zFECAwEAAQ==

RSA private key:

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

RSA sign

import java.security.KeyFactory;
import java.security.Signature;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Base64;

public class RsaSign {

    public static final String PRIVATE_KEY = "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";

    public static void main(String[] args) throws Exception {
        String param = "{\"appId\":\"str1\",\"appName\":\"str2\",\"channelCode\":\"str3\",\"mchOrderId\":\"str4\",\"amunt\":200,\"notifyUrl\":\"str5\",\"customerName\":\"str6\",\"email\":\"str7\",\"mobile\":\"str8\",\"remark\":\"str\"}";

        Signature signature = Signature.getInstance("SHA256withRSA");
        signature.initSign(KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(Base64.getDecoder().decode(PRIVATE_KEY))));
        signature.update(param.getBytes());
        byte[] bytes = signature.sign();
        String sign = Base64.getEncoder().encodeToString(bytes);
        System.out.println(sign);
    }
}

the value of sign should be:

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

RSA verification

import java.security.KeyFactory;
import java.security.Signature;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;

public class RsaVerifySign {

    public static final String PUBLIC_KEY = "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";

    public static void main(String[] args) throws Exception {
        String param = "{\"appId\":\"str1\",\"appName\":\"str2\",\"channelCode\":\"str3\",\"mchOrderId\":\"str4\",\"amunt\":200,\"notifyUrl\":\"str5\",\"customerName\":\"str6\",\"email\":\"str7\",\"mobile\":\"str8\",\"remark\":\"str\"}";

        String sign = "TRFUJBoPDGaxXGCPp6BdMtRX4KjsfcPLQNkB95WCbO47LCU6NEohiNcIj1G7RG9OfbeYC3VrMXj7NnRrsvVnZQNUq1F5FIOb0C52qYjYimzY5MXpTBEgZ/Fxg75b9g5/tQAN48tQX3/gPTaJudeyT3POwsHx2jNBiJoV59nPEXFT56X3BzsXjLejEVlB2CuVBAOo8zQ0smq9eqrplWY+nTgwS3LY5tdrbHlMbxIj4Jfn+GTZBqrlC80GgFlaAR3iU8p4Jyjmb2HBjUUO6cs/F6JRwPrZdVjlmL+4dFd+GCL8QEAWs+7epVjIE5rIF7XoLSvenryW3IR0H3OPAtj3ETEekCkttC7sDynPDOkjhSE5uwc0HtYyUFVxXQJAYPNSNWXYxVQFSXzaVdEzgdqSaRzLuSrYzpT38ua/ZtzhvpWAyeWvUSONP6q4ZJEWcDsafDhy4/LLKjdOisiLgaBHiiaOYZQYqo6p7pPE9Rv8/MIZgm5qXqVEC5OI+tYeMssSMZIrnd1jDkjW+h1RpuuvD0pmYQjrhk9/+hH6empXLnCfSA5kzGw6shi8c/XbiKWOaqgSTLsHXxmjATDdSKjuQk4VJ4aNxcve1G8Tx7FqWxBCVESkJPRODMnp6S//dZmCO9+xNVPCwhFOArMH/AB+YwbFPsMVku2J12Kk96sy/mo=";

        Signature signature = Signature.getInstance("SHA256withRSA");
        signature.initVerify(KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(Base64.getDecoder().decode(PUBLIC_KEY))));
        signature.update(param.getBytes());
        boolean result = signature.verify(Base64.getDecoder().decode(sign));
        System.out.println(result);
    }
}

the value of result should be true