diff --git a/schema/cryptography-defs.json b/schema/cryptography-defs.json
index 761c6672..67742512 100644
--- a/schema/cryptography-defs.json
+++ b/schema/cryptography-defs.json
@@ -1519,6 +1519,51 @@
           "primitive": "drbg"
         }
       ]
+    },
+    {
+      "family": "CTR_DRBG",
+      "standard": [
+        {
+          "name": "SP800-90Ar1",
+          "url": "https://doi.org/10.6028/NIST.SP.800-90Ar1"
+        }
+      ],
+      "variant": [
+        {
+          "pattern": "CTR_DRBG[-{cipherAlgorithm}][-{keyLength}]",
+          "primitive": "drbg"
+        }
+      ]
+    },
+    {
+      "family": "Hash_DRBG",
+      "standard": [
+        {
+          "name": "SP800-90Ar1",
+          "url": "https://doi.org/10.6028/NIST.SP.800-90Ar1"
+        }
+      ],
+      "variant": [
+        {
+          "pattern": "Hash_DRBG[-{hashFunction}]",
+          "primitive": "drbg"
+        }
+      ]
+    },
+    {
+      "family": "HMAC_DRBG",
+      "standard": [
+        {
+          "name": "SP800-90Ar1",
+          "url": "https://doi.org/10.6028/NIST.SP.800-90Ar1"
+        }
+      ],
+      "variant": [
+        {
+          "pattern": "HMAC_DRBG[-{hashFunction}]",
+          "primitive": "drbg"
+        }
+      ]
     }
   ],
   "ellipticCurves": [