How to use HMACSHA256 in F&O

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Posted on by Pooja Karki

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Hi,

I have a requirement where I need to generate the authentication signature using .Net class HMACSHA256. Does any one know how we can use this in x++. I have key and data using these values we have to generate hexa signature.

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Hana Xue Microsoft Employee on at

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Hi,
Before the developer offers professional advice, hopefully the following link will be helpful.
GitHub - hadmacker/HmacSignature: HMAC SHA256 Signature implementation using .NET Core and xUnit
Best Regards,
Hana

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Martin Dráb 238,143 Most Valuable Professional on at

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You can use System.Security.Cryptography.HMACSHA256 class via .NET Interop. It's included in the .NET Framework.

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Pooja Karki 3,045 on at

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Hi,

Thanks for response I have refered both link and written below code and getting below output in X++. I am not sure what wrong I was doing.

Code output: "System.Byte[]"

str key, data;
System.Text.StringBuilder sBuilder;
ClrObject obj;
str signature;

key='67be6c44----a34fa4f1abb6';
data='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';

System.Security.Cryptography.HMACSHA256 hmac=new System.Security.Cryptography.HMACSHA256();
hmac.Key=System.Text.Encoding::UTF8.GetBytes(key);
hmac.ComputeHash(System.Text.Encoding::UTF8.GetBytes(data));
obj=hmac.Hash;
sBuilder = new System.Text.StringBuilder();
sBuilder.Append(obj);
signature=sBuilder.ToString();
info(strFmt("%1",signature));

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Martin Dráb 238,143 Most Valuable Professional on at

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You seem to implicitly convert a byte array to string, which calls ToString() method of the array and it gives you this result.

First of all, ask yourself whether you need to convert the hash to a string at all. If so, think about how you want to convert it. Then write code doing that.

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Pooja Karki 3,045 on at

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Thanks for suggestion , I am able to generate signature using below code.

str key, data;
System.Text.StringBuilder sBuilder;
System.Array resultByteArray;
int arrayLength ;
ClrObject clrStrObject;
ClrObject clrStr;
int i;
str signature;

key='67be6c44----a34fa4f1abb6';
data='xxxxxxxxxxxxxxxxxxxx';

System.Security.Cryptography.HMACSHA256 hmac=new System.Security.Cryptography.HMACSHA256();
hmac.Key=System.Text.Encoding::UTF8.GetBytes(key);
resultByteArray=hmac.ComputeHash(System.Text.Encoding::UTF8.GetBytes(data));
sBuilder = new System.Text.StringBuilder();
arrayLength = resultByteArray.get_Length() ;
for (i = 0; i <arrayLength; i++)
{
clrStrObject = resultByteArray.GetValue(i);
clrStr = clrStrObject.ToString('x2');
sBuilder.Append(clrStr);
}
signature = sBuilder.ToString();
info(strFmt("%1",signature));
}

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