Add c# sample to compute signature

[taconaut]

I had to figure out how to generate the signature using c# code and hope to save future developers some time by providing this example. This code has been successfully used for tests and has been reformatted/renamed slightly to provide a concise example.

[golayp]

Hello @taconaut Did you test with spaces in values ? I'm facing an issue: Integrity check failed, the body hash does not match the hash in the header when I try for example with "familyName": "Roger Martin".

[delixfe]

@taconaut: Thanks for providing the sample. @golayp: The regex new Regex("[\\n\\r\\t ]" should handle the spaces.

[golayp]

thanks @taconaut @delixfe but as explained in this bug I already use this regex for signing my calls, but the validation fails on the test server of OFIT.

[taconaut]

@golayp I just did a quick test with your example and the generation worked fine:

[golayp]

It's seems we're all doing the same stuff lol... my code looks like yours. Unfortunately it's probably elsewhere in the process. I'm using Newtonsoft.Json.JsonConvert.SerializeObject to serialize the payload before using regex... do you think it could end up in an error ?

[taconaut]

It's seems we're all doing the same stuff lol... my code looks like yours.

That's the reason I've posted the sample. I've suspected we weren't the only ones :)

I'm using Newtonsoft.Json.JsonConvert.SerializeObject to serialize the payload before using regex... do you think it could end up in an error ?

No, I do the same:

        private string GetSignature(VaccinationCertificateCreateDto certificateCreateDto)
        {
            var jsonString = JsonConvert.SerializeObject(certificateCreateDto);
            var cleanJsonString = _cleanJsonStringReplaceRegex.Replace(jsonString, string.Empty);

            var signedBytes = _rsaSignature.Value.SignData(Encoding.UTF8.GetBytes(cleanJsonString), HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);

            return Convert.ToBase64String(signedBytes);
        }

Where VaccinationCertificateCreateDto is generated using Nswag.

[golayp]

Exact same process on my side, we investigate. Thank you for your help.

[golayp]

Hi @taconaut do you have a version of your generated nswag client to provide to me ? since my issue is almost incomprehensible... I still have issue with givenname or familyname with space in them.... it could be very useful to me.

[taconaut]

Hi @golayp, I''ve added the generatedc client along with the nswag spec, used to generat it, here https://gist.github.com/taconaut/b1c0c88cdaa54c0e2d32288e1a32c5f1

[golayp]

Thanks. Finally it was an issue somewhat diffcult to spot on my side... Thank for you help.