{
   "title":"MAC-02: MAC message w/ two counter signature",
   "input":{
      "plaintext":"This is the content.",
      "mac":{
         "alg":"HS256",
         "protected":{
            "alg":"HS256"
         },
         "recipients":[
            {
               "unprotected":{
                  "alg":"direct",
                  "kid":"our-secret"
               },
               "key":{
                  "kty":"oct",
                  "kid":"our-secret",
                  "use":"enc",
                  "k":"hJtXIZ2uSN5kbQfbtTNWbpdmhkV8FJG-Onbc6mxCcYg"
               }
            }
         ],
         "countersign":{
             "signers":[
                 {
                     "key":{
                         "kty":"OKP",
                         "kid":"11",
                         "crv":"Ed25519",
                         "x_hex":"d75a980182b10ab7d54bfed3c964073a0ee172f3daa62325af021a68f707511a",
                         "d_hex":"9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60"
                     },
                     "unprotected":{
                         "kid":"11"
                     },
                     "protected":{
                         "alg":"EdDSA"
                     }
                 },
                 {
                     "key":{
                         "kty":"EC",
                         "kid":"11",
                         "crv":"P-256",
                         "x":"usWxHK2PmfnHKwXPS54m0kTcGJ90UiglWiGahtagnv8",
                         "y":"IBOL-C3BttVivg-lSreASjpkttcsz-1rb7btKLv8EX4",
                         "d":"V8kgd2ZBRuh2dgyVINBUqpPDr7BOMGcF22CQMIUHtNM"
                     },
                     "unprotected":{
                         "kid":"11"
                     },
                     "protected":{
                         "alg":"ES256"
                     }
                 }
             ]
         }
      }
   },
   "intermediates":{
      "ToMac_hex":"84634D414343A101054054546869732069732074686520636F6E74656E742E",
      "CEK_hex":"849B57219DAE48DE646D07DBB533566E976686457C1491BE3A76DCEA6C427188",
      "recipients":[
         {
         }
      ],
      "countersigners":[
         {
            "ToBeSign_hex":"8570436F756E7465725369676E617475726543A1010543A101274054546869732069732074686520636F6E74656E742E"
         },
         {
            "ToBeSign_hex":"8570436F756E7465725369676E617475726543A1010543A101264054546869732069732074686520636F6E74656E742E"
         }
      ]
   },
   "output":{
      "cbor_diag":"97([h'A10105', {7: [[h'A10127', {4: h'3131'}, h'B4924B18EB4E047313C707B0EDA4AB844345F2C44987D6F9EBCC777EFD4078CC0F4C108DEF959F78F1EDB2765425785FCD17D512BE31EEB66BEFF1E8FC274707'], [h'A10126', {4: h'3131'}, h'6ACD94D3CCF71D192E8528360BA7E346DAC464E9EDCA4CFEB6CEB6BDE7BAEC9FF26CA6BDF73D0BE41E36129DCFF751DD2B5AD5CE116E8A963A2738A299477A68']]}, h'546869732069732074686520636F6E74656E742E', h'2BDCC89F058216B8A208DDC6D8B54AA91F48BD63484986565105C9AD5A6682F6', [[h'', {1: -6, 4: h'6F75722D736563726574'}, h'']]])",
      "cbor":"D8618543A10105A107828343A10127A1044231315840B4924B18EB4E047313C707B0EDA4AB844345F2C44987D6F9EBCC777EFD4078CC0F4C108DEF959F78F1EDB2765425785FCD17D512BE31EEB66BEFF1E8FC2747078343A10126A10442313158406ACD94D3CCF71D192E8528360BA7E346DAC464E9EDCA4CFEB6CEB6BDE7BAEC9FF26CA6BDF73D0BE41E36129DCFF751DD2B5AD5CE116E8A963A2738A299477A6854546869732069732074686520636F6E74656E742E58202BDCC89F058216B8A208DDC6D8B54AA91F48BD63484986565105C9AD5A6682F6818340A20125044A6F75722D73656372657440"
   }
}