Open API Reference for BluePay

# Unified API Param

# Content

parameter name required type description
sign Yes string RSA sign of param
param Yes string request param content string

# Example

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

# Descrption

  1. BluePay will construct the request parameters according to the specific interface documents, and format the request parameters into JSON format as the value of param;
  2. BluePay uses BluePay' RSA private key to sign param, and the obtained value is used as the value of sign;
  3. When the merchant receives the request from BluePay, it uses the RSA public key of BluePay to verify and sign param. If the signature is consistent with sign, it proves that the request is requested by BluePay;
  4. Please ask the BluePay administrator for the RSA public key of BluePay.

# 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:

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

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 = "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";

        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

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