Below is an example of how you can use the AWS Payment Cryptography Data Plane API in Java to decrypt data from a POS terminal. In this example, we assume that your POS terminal data was encrypted using a symmetric key (for example, using TDES with CBC mode). You’ll need to adjust the attributes (for example, algorithm, mode, and key length) to match your specific encryption settings.
Prerequisites
AWS Account & Payment Cryptography key: Ensure you have created or imported a decryption key in AWS Payment Cryptography. The key must have its KeyModesOfUse set to allow decryption.
AWS SDK for Java v2: The Payment Cryptography Data Plane client is available in the AWS SDK for Java v2.
POS Terminal Data: Your encrypted POS terminal data (ciphertext) is provided as a hex string.
Example Code
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Sample Output Log
When you run this program with the test data above, you might see console output similar to:
Explanation
Client Creation
The code creates a PaymentCryptographyDataClient using the default configuration. (Make sure your AWS credentials and region are set up correctly.)Decryption Attributes
The example builds a set of decryption attributes specifying that the data was encrypted with a symmetric algorithm (e.g. TDES in CBC mode). Adjust the mode (or use other attribute types such as Dukpt or EMV if needed) to match your use case.Building the Request
A DecryptDataRequest is built by supplying the key identifier (ARN of the decryption key), the ciphertext, and the decryption attributes.Handling the Response
The response contains the decrypted plaintext (returned as a hex string). An optional utility method converts this hex string into a regular string if your original plaintext was text-based.Exception Handling
Errors during the API call are caught and printed to aid in troubleshooting.
Additional Considerations
Encryption Attributes:
If your POS terminal uses a derived key such as DUKPT, you will need to use the appropriate decryption attributes (for example, by setting Dukpt attributes instead of symmetric ones).Data Format:
Ensure that the ciphertext provided is in the format expected by the API (typically as a hex string).AWS SDK Configuration:
Customize your client (e.g., region, endpoint, credentials) as needed for your environment.
This sample provides a starting point for integrating AWS Payment Cryptography into your Java application to decrypt POS terminal data securely. For full details on the API parameters and supported algorithms, refer to the AWS Payment Cryptography Data Plane API Reference.
