Add SP800-56C family (#877)

Fixes #876

Author: stevespringett

schema/cryptography-defs.json

@@ -1097,7 +1097,26 @@
       "variant": [
         {
           "pattern": "SP800_108_(CounterKDF|FeedbackKDF|DoublePipelineKDF|KMAC)[-{prfFunction}][-{dkmLength}]",
-          "primitive": "key-derive"
+          "primitive": "kdf"
+        }
+      ]
+    },
+    {
+      "family": "SP800-56C",
+      "standard": [
+        {
+          "name": "SP800-56C",
+          "url": "https://doi.org/10.6028/NIST.SP.800-56Cr2"
+        }
+      ],
+      "variant": [
+        {
+          "pattern": "SP800_56C_OneStep[-{auxFunction}][-{dkmLength}]",
+          "primitive": "kdf"
+        }
+        {
+          "pattern": "SP800_56C_TwoStep_(CounterKDF|FeedbackKDF|DoublePipelineKDF)[-{auxFunction}][-{dkmLength}]",
+          "primitive": "kdf"
         }
       ]
     },