Hi,
I'm trying to implement the hmac sha256 example from the documentation in Salesforce Apex, but I am not able to reproduce the base64 value.
This is the example HTTP request from the documentation:
POST /v1/cases HTTP/1.1 Host: rms-world-check-one-api.thomsonreuters.com Date: Tue, 07 Jun 2016 20:51:35 GMT Content-Type: application/json Content-Length: 88 { "caseId": "my customer ID", "name": "John Doe", "providerTypes": ["WATCHLIST"] }
According to the example, the following input should be used for the hmac function:
(request-target): post /v1/cases host: rms-world-check-one-api.thomsonreuters.com date: Tue, 07 Jun 2016 20:51:35 GMT content-type: application/json content-length: 88 { "caseId": "my customer ID", "name": "John Doe", "providerTypes": ["WATCHLIST"] }
I implemented the function (as shown below), but keep getting different values. I even tried to alter the spaces and the line endings, but never matched the value, which is shown in the example:
"Given the above signing text, if a secret key of “1234” is used, the computed HMAC-SHA256 value would beDA26D7F5BFF89A100D1A597AA015099FC55DD3130F023E952BFBE3A6949F322A
when printed using hex encoding, or2ibX9b/4mhANGll6oBUJn8Vd0xMPAj6VK/vjppSfMio=
when printed using base64 encoding."
[...]
String testString = '(request-target): post /v1/cases\n' +'host: rms-world-check-one-api.thomsonreuters.com\n' +'date: Tue, 07 Jun 2016 20:51:35 GMT\n' +'content-type: application/json\n' +'content-length: 88\n' +'{\n' +'"caseId": "my customer ID",\n' +'"name": "John Doe",\n' +'"providerTypes": ["WATCHLIST"]\n' +'}'; String testKey = '1234'; String algorithmName = 'HmacSHA256'; Blob hmacData = Crypto.generateMac(algorithmName, Blob.valueOf(testString), Blob.valueOf(testKey)); return EncodingUtil.base64Encode(hmacData);
[...]
In this case, the base64 value was "V9d9dkg2aS1J0P/7GVPdC34ddLMdrRixtt6mf9xsJ+Q="
Line endings should be fine, according to the Salesforce Apex Language Reference. \n should be a LF Line ending.
Source: https://resources.docs.salesforce.com/sfdc/pdf/salesforce_apex_language_reference.pdf - Page 29
Salesforce docs show, the used method is fine: Crypto.generateMac
Source: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_restful_crypto.htm
Do you have any idea what is wrong here? Do I have an error in my spacing or something like that? I just want to implement the example in Salesforce Apex Code.
Thanks in advance.