商户统一 API 参数

内容

参数名	是否必填	类型	说明
appId	是	string	商户APP ID，由 Bluepay 提供
sign	是	string	param 的RSA签名
param	是	string	请求参数字符串

示例

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

说明

1. appId 是由 Bluepay 提供的固定值；
2. 根据具体接口文档，构造请求参数，将请求参数格式化为 JSON 格式，作为 param 的值；
3. 使用 RSA 私钥对 param 进行签名，得到的值作为 sign 的值。

附录 RSA 使用示例（Java 语言）

生成RSA密钥对：

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密钥长度设置为 4096

RSA 公钥请提交给 Bluepay，请不要透露给任何第三方。

RSA 私钥由商户保管，请不要透露给任何人。

当商户请求 Bluepay 的 Open API 时，商户使用 RSA 私钥对请求参数进行签名，Bluepay 会使用商户提供的 RSA 公钥对请求中的签名进行验证。如果验证失败，Bluepay 服务器会拒绝处理请求。

示例密钥对

RSA 公钥:

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

RSA 私钥:

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

RSA 签名：

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 = "MIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggkoAgEAAoICAQCcU+CmbOpwpUanUKL9ZQ/M+SEGeiMPA8MEVZsHpEFcqNTw92n6f0rusDRk/oEPX07gwwnBjEb2fvN/v8hugD5sV9b+OwEaLjWDvAFp9snEEpdB5ex0TxpHDsFy+OtNsvoRVSfaQxyLZ30Ew8yw8cLIOa5tUhVU37SvF+3S/DZHmNsP+SDt7Qrj6WznTl5jwpG/aukt0SWHJigD4+kUZn/zgWE7ScIZNBkLPh1wgr1rFnxFcqlVlBSi0F9srPNiYLwVBTgx5Cnm9O23IS53I7T/0+1lQQSDWw3bXthnLAd5LbvjTfUXx0MLtp8PaJVMRLWhsiiq/AScP0IN9JuYXSnAu+F4uF0bJWeHcWYy9B626t/5xNhmi0/uKBOgvUySZMiVInaranM81rPR3IGivEHbxaXEK49Fm5EI3OF3P8fr3jK3KYSnCpdSjlVtx975CBUUp26Gdhqljg22/yhJ2wfYx4pvl2FzWw74jR+qshbbnNQ4fwQJZBuBXnQjtAg86Eq4s6Rlb8QQbZ6nCVjzceo2sqEfpZ34NcSOKbP3NGYI1FugDwyzA3xNG/q8aeY/ysVs+IiX+kEAMVWKIX5M/Tw7ZVZv/1FpeKWzQwl+Ey9Nno+OFJwgq1f2rrBPbyAdgh0EPlR+sos+d0kzEz27cfNZgLCHFrhujG7b7covB3vMUQIDAQABAoICAF6wL5KexiIU+ga+QPtbC4cMH4Tc1f9yN92YPJ8UTsLhQJn0Qq0IDUsmT5Yc0e+NuylI+c/SN+l2W+c1MyI7a5QUYJT9CF3jP2bbqb+VTAEHgbbYnbCVeUUxGtuZCm21yuJUwh7iJ5gIxyDruEA1L9Y3mf99iI4wMjEcPWFeg0I6w/WY4Ok8eywxZ1Vzkpi6ca2QBE1MMX77DaHNmpBQxY+o/kv7ESZS+BhnN02+4xzKMdue6BJ970HvFN2upH0iOspArxkJKphKIvKZlptzdV6/7zs1dpZZwLrvaASWFrC/kt7LiXktqN6fbxjWMBhSRfH7B8cJf4Fkj44Ea3qOc4rmZiUfOxdda2512TG4/NfXM4HB0xsSkySU1nZIWLO9S8/ZzRHllASXG+/o1p58e3fIjGeBb4PZPn8NipYjvyS7BvP8N4/ZIfPiDYuqgDFQXwosmft7gUgPztXsm+gytyZHp4pxYhW+oH+qh3HOdxQp+8UQxlxrqANURyWWS/S2EugPYkZn1UMW57ckvO5sNeut61BmBPUAmi0DP9bpIMQ2dmWEHCiBVdrOjh6dQTkA33zqb3Vb9s0kOnDNtYBE3e1llo/vTCEkisw9nmsul8rwQtk1XDhalvQg2myiEvWg8oVoCp5exzoj+kQoaWVa7uKdSkwDIcfJHsATsETs/O8BAoIBAQDfs+ufFnTPwuL0eHhBm4EZqsfQfyNImWYu/0dkPyyTJtJNnM0RAlfy8spb44nR9hLoYsLGueTd2DOnQ0x5S+8MbYgQ1za6k7naayLuu9rdrazJTbzMqUaxcnMDEG26v2aUCfSyQKiO+ctVL7eZ7lkO2vIUb8U5a0sQjBbFVQJsgSKydb5v5GMFfh+yph+6ObO8qt+kU6+ZUCzQtBNFcEiyZjaUpvkc7gQf4HzVKgQ2qdLGrsX0mhuVgy6WqXsWD4nNmdyLAhsQQFYRFPhvAR+yIG7jr7NaHfJYmyIiiYhgrmWEQVjvo+BsI5qqq3/s7Qp2c109rkAr/CGDAfJP+bvNAoIBAQCy5cOLmkoi28T7lucNbVRv1Pg9eZRTpZASs32SvSVKQdFyiU83P7Z8+qn8mlXgiFOEmXk0ZRRUC9e2H4lNhLQctbZ0IJ4fMkFHqm+iEEMaGTovaRFW6pbH0m6hEqtumqA6orlDkGQ6PkFEr7CAoGSf0zTLStE03/4yL35ZLR8GAVFE6Fi4f4rdYLjJacCRyvqhM9yhS1j7SUPAGdPHZBJS5xhpJ6GQt5Vqc7oxk4ms66LMV0swme+ucvuhspNo44WCqVkeErv8LpF0ix08+hzzDVhnyFPJcNDmcl5VkV+n7ocHkONAB7Wth8Y0ep4ixBSPKPuI4T/zcYiqpqWR1XaVAoIBAQCyPk8A3MjIfnWN66uOQxST2gMKOzNm9mt4CQnec4PV4Dnzg3vWELL5LsFUhDHdbR/VsFOYOqiEp29I2BPIFlvr4B5ppMHD2k9dHL6h0Gbs+SRS5bEItdxRKWtAxsdX5Igcbu5dVa249oowXywA5+xoLMZ0yDYysS4HikfehgS/Zgm6fpz11Nmdl8gz9bAUF0QCkXhPHCsvkrWSudkdHAGgvFbDDWQyy+fXamytAKSI1bnPe5TZeC2AbR0jCPm9MzZO70jOLihYQ5sQU1A8Sn3x1Wvl2aqjpHbkaP/C2ykiN/NFdTgjAcWhBKGJWcs9ggYzKWri6cPSCDy/gT6MwOUFAoIBADN7g6atJCCb9jgg2SU4DVCRjU7DqjfYMXnwRXbxD8Yq4sd/VFil8TJOQJT9JTGUidRjBkpZvFvjfJRgxvaT9fE9KeCJcnev0rF5Dt8opubf06rJJcBJilK+8C9SXBtcTDgTlBUpfG52c/n8RWL+xXZpJYxLX6FDxLdUi5vGLGNiBa064C1YJvJGX2c3E7/hFfdGIXwZXuYR03l49UUwO0W4U4IPcaNf8ZPM8gxKVRh6R0Ne67h01FDzrg5+gYVx1H4hlg/dfFO6YwmS7zsZDzOy53oWYGZcHQH0b8lYKJr/PcSjoYJPtazWoeeAUfnXS8NXG+vsRqccSSQzCPrK33ECggEAbr3OYFNmo9D/Ud3zhTFT4wV2ZybfeVgDdI2drWUNTxdHf2FNYxNMYu3IFmyzqpvr7CSOXzLBGfvQxMa1qZZ4nM4Jd3Ai5HTW3kU9HLqVs8pbBdTNY5MNA+cDSGNZeUjcqjnu/5az6T92ZVigBkOjKIjB0hlrQR/ADZLwbABVK3ISNDbffAm4geyVhk3EkJBs+YIYhoWJ78E1/Y94WEPL5qPJkTG4PhAl+Krjwaq6paEwG8FEHZ5MuqwDXlG2EOMJ9j6s1UwJ0cpyWOtNBSWl+7YnQCJZCQiMmcDorCh/WEM+X7t1VxnxmDsOQ336gLPP/EYEaA8i78TMwvAVt1bN1g==";

    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);
    }
}

sign 的值：

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

RSA 签名验证

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);
    }
}

result 的值： true