fix: responder algorithms

[leongross]

Resolves #41

The Action still fails because of #44

thread 'main' (3212) panicked at examples/spdm_requester.rs:431:13:
assertion `left == right` failed
  left: [48, 101, 2, 49, 0, 146, 81, 128, 123, 16, 239, 183, 3, 90, 219, 148, 202, 47, 16, 50, 172, 165, 186, 204, 155, 36, 224, 252, 237, 149, 251, 109, 46, 142, 239, 251, 82, 223, 240, 41, 111, 207, 70, 73, 175, 223, 83, 47, 199, 197, 93, 113, 177, 2, 48, 104, 118, 111, 126, 2, 247, 111, 191, 80, 253, 80, 174, 192, 72, 169, 214, 151, 158, 50, 105, 45, 0, 148, 164, 83, 111, 156, 36, 35, 108, 166, 152, 22, 128, 225, 230, 201, 57, 26, 83, 214, 177, 84, 116, 173, 141, 137, 222]
 right: [48, 101, 2, 48, 42, 50, 149, 44, 255, 170, 31, 51, 82, 111, 108, 253, 64, 114, 255, 23, 137, 110, 3, 95, 187, 66, 3, 196, 110, 23, 134, 170, 152, 168, 193, 32, 18, 217, 4, 124, 22, 234, 31, 174, 138, 239, 133, 17, 65, 87, 223, 252, 2, 49, 0, 168, 76, 185, 144, 75, 47, 106, 79, 194, 142, 216, 35, 173, 129, 222, 76, 81, 80, 11, 39, 23, 143, 70, 38, 137, 59, 159, 249, 206, 72, 224, 238, 40, 253, 63, 6, 225, 179, 77, 143, 108, 72, 28, 42, 148, 169, 208, 222]

See #45 for the round-trip fix.

[embediver]

Good job!