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c. Decryption Operation Guide

This guide details how to decrypt encrypted response data obtained from WaaS APIs.

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i. Decryption Process Step-by-Step Explanation

The following are the steps for decryption operations:

  1. Obtain encrypted data from the API response
  2. Perform Base64 decoding of the data
  3. Decrypt using the RSA public key
  4. Parse the decrypted result into the business object

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ii. Decryption Code Examples

class DecryptionExample {
    public static void main(String[] args) {
        try {
            // ===================== 1. Get API response =====================
            // Send API request and get response
            APIResult response = restTemplate.postForObject(
                "https://waas2-out-api.powersafe-rel.cc/api/v1/api/user/getUserAddress",
                httpEntity,
                APIResult.class
            );

            // Extract encrypted data (ensure response format matches API)
            String encryptedData = response.getData();

            // ===================== 2. Base64 decoding =====================
            // Decode using Base64 utility class (implementation reference utility classes)
            byte[] decodedBytes = Base64Util.decodeString(encryptedData);

            // ===================== 3. RSA public key decryption =====================
            // Use the same public key as for requests
            String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQ...";

            // Perform RSA decryption
            byte[] decryptedBytes = RSAUtils.decryptByPublicKey(
                decodedBytes,
                publicKey
            );

            // ===================== 4. Parse business object =====================
            // Convert decrypted JSON data to business object
            AddressVO address = JsonUtils.fromJson(
                new String(decryptedBytes, StandardCharsets.UTF_8),
                AddressVO.class
            );

            // ===================== 5. Use decrypted data =====================
            System.out.println("Parsed address information:");
            System.out.println("Merchant user ID: " + address.getTenantUserId());
            System.out.println("Chain name: " + address.getChainName());
            System.out.println("Wallet address: " + address.getAddress());
            System.out.println("Tag: " + address.getTag());
            System.out.println("State: " + address.getState());
            System.out.println("Risk score: " + address.getRiskScore());

        } catch (Exception e) {
            System.err.println("\nError occurred during decryption: " + e.getMessage());
            e.printStackTrace();
        }
    }
}