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Last active November 5, 2018 09:46
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[Java] How to calculate and encode an element digest.
/*
* The following snippet calculates the SHA512 digest hash of the received element and return it as a BASE64
* encode String. It is used to calculate the digest of the content of the request and it is an important
* element of the signature. The expected parameter is the plain text representation of the request's body
* being sent. For SOAP, it is the XML node being signed. For RESTful is the JSON document being sent.
*
* Gists provided for illustrative purposes only. Developers can use these as a support tool
* but the Office of the Revenue Commissioners (Revenue) does not provide any warranty with
* these gists.
*/
public static String calculateAndEncodeElementDigest(InputStream element) throws IOException, NoSuchAlgorithmException {
MessageDigest sha512Digest = MessageDigest.getInstance("SHA-512");
ByteArrayOutputStream elementOutputStream = new ByteArrayOutputStream();
byte[] elementData = new byte[1];
while(element.read(elementData) != -1) {
elementOutputStream.write(elementData);
}
elementOutputStream.flush();
byte[] digest = sha512Digest.digest(elementOutputStream.toByteArray());
return Base64.getEncoder().encodeToString(
digest
);
}
@neilm-fourjs
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This does NOT use sha512 on the input value!!! it is just returning the base64 encode version of the input string!!!!

@RevenueGitHubAdmin
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Hi neilm-fourjs, apologies for the delayed response. We have updated this gist.

Thanks for your input. Please don't hesitate to highlight other issues.

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