Question for ES256 ... need for JWTs for DID project

Dear all, I hope today finds you well. I hope it is in scope to ask about
ES256. I'm using it for JWTs for a did type construction.

I' m a bit confused what ES256 is supposed to look like. I chose to follow:
https://www.rfc-editor.org/rfc/rfc7515.html#appendix-A.3

In summary I have this working..

{"alg":"ES256"} converted to octet Array and then converted to base54ul
gives: eyJhbGciOiJFUzI1NiJ9

{"iss":"joe","exp":1300819380,"http://example.com/is_root":true} converted
to octet Array and then converted to base54ul gives:
eyJpc3MiOiJqb2UiLCJleHAiOjEzMDA4MTkzODAsImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ

concatenating and then converting to a octetArray gives

toOctetArray(eyJhbGciOiJFUzI1NiJ9.eyJpc3MiOiJqb2UiLCJleHAiOjEzMDA4MTkzODAsImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ)

[101, 121, 74, 104, 98, 71, 99, 105, 79, 105, 74, 70, 85, 122, 73,
   49, 78, 105, 74, 57, 46, 101, 121, 74, 112, 99, 51, 77, 105, 79, 105,
   74, 113, 98, 50, 85, 105, 76, 65, 48, 75, 73, 67, 74, 108, 101, 72,
   65, 105, 79, 106, 69, 122, 77, 68, 65, 52, 77, 84, 107, 122, 79, 68,
   65, 115, 68, 81, 111, 103, 73, 109, 104, 48, 100, 72, 65, 54, 76,
   121, 57, 108, 101, 71, 70, 116, 99, 71, 120, 108, 76, 109, 78, 118,
   98, 83, 57, 112, 99, 49, 57, 121, 98, 50, 57, 48, 73, 106, 112, 48,
   99, 110, 86, 108, 102, 81]


However, I am not sure what to do from here. I think I should hash it and
then sign it with a private key. If I perform a SHA-256 hash of this I get.

Uint8Array(32) [
  180,  18, 240, 220, 249,   3,  49, 190,
  173, 106, 190, 219,  46, 253, 149, 129,
  253, 214, 109,  21,  89,  79,  24,  93,
  153, 224, 231,  84, 182,  63, 136, 232
]

The signature will then be:

Uint8Array(32) [
  225, 116, 158,  38, 197,   3,  46,  22,
   98, 176,  94, 213, 135,  30, 226,  96,
  143, 234, 247,  30, 218, 220, 201,  60,
  251,  11,  35, 250,  58,  95, 223, 208
]
Uint8Array(32) [
  209, 123, 230, 195, 18, 223, 176, 237,
   73,  77, 215,  28, 31, 166,  42,  46,
  186, 129, 172, 178,  2,  74,   1,  63,
   70, 192,  71, 142, 70,  60, 238,  34
]

However, this is not what I get. Am I missing something?

I put my code in a gist:
https://gist.github.com/bshambaugh/7caa03e042545873b5cf055b584e8157

-Brent Shambaugh

GitHub: https://github.com/bshambaugh
Website: http://bshambaugh.org/
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