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Following the instructions from: https://developer.atlassian.com/cloud/jira/platform/understanding-jwt/
I think there is a very misleading error in the description on how to create the query hash.
Step 7 states:
Hash the canonical request bytes using the
This is not correct in all cases. The hash of foo in C# is a byte array, not a string. Only by applying hex encoding to the hash will the resulting UTF8 string become the string mentioned above. This step is omitted in the instructions. Also in other places Base64-encoding is used, but for the query hash, HEX encoding is used. Maybe this is some default in JAVA?
Since the query hash is a bit overworked anyway, clear instructions would help =).
For my C# aspnet core 2.2 implementation of a jwt token, I used the code below.
signingUrlString is the input in the format described in the instructions, ex:
using (SHA256 mySHA256 = SHA256.Create())
var signingBytes = Encoding.UTF8.GetBytes(signingUrlString);
var shaHashofSigning = mySHA256.ComputeHash(signingBytes);
queryHash = ToHex(shaHashofSigning, false);
private static string ToHex(byte bytes, bool upperCase)
StringBuilder result = new StringBuilder(bytes.Length * 2);
for (int i = 0; i < bytes.Length; i++)
result.Append(bytes[i].ToString(upperCase ? "X2" : "x2"));
I used a validation tool for the querystring hash during testing of the JWT implementation to check if the hash was correct: http://jwt-decoder.herokuapp.com/jwt/decode
I have no affiliation to the tool itself, so I cannot say if its safe or not, so use with caution, and do not expose any sensitive urls or queries.
I Hope this might help anyone who have issues with the querystring hash. Please comment if you have any input on this, or if you find errors in the code.