Posts: 1
Registered: ‎01-30-2019

SHA512 - Signature Key to Byte Array Java

Authorize.NET provides C# code to convert the Signature Key to a Byte Array and calculate the HMAC-SHA512 value.  Their example code is using lambda coding in C#.  Can someone provide a Java equivalent example of this?  I have  non-lambda Java version working, but I would like to know how to do a Java lambda version.


I came up with the following, but it won't work because the .toArray() method returns an int array, not a byte array:


byte[] k =, binSigKey.length)

                            .filter(i -> i % 2 == 0)

                            .map(i -> Byte.parseByte(signatureKey.substring(i, i + 2), 16))



Original C# version provided by Authorize.NET as an example:


byte[] k = Enumerable.Range(0, key.Length)
                             .Where(x => x % 2 == 0)
                             .Select(x => Convert.ToByte(key.Substring(x, 2), 16))