diff --git a/include/crypto_config_structs.h b/include/crypto_config_structs.h
index d175bfa5..3ad48826 100644
--- a/include/crypto_config_structs.h
+++ b/include/crypto_config_structs.h
@@ -58,7 +58,8 @@ typedef enum
     CRYPTOGRAPHY_TYPE_UNITIALIZED = 0,
     CRYPTOGRAPHY_TYPE_LIBGCRYPT,
     CRYPTOGRAPHY_TYPE_KMCCRYPTO,
-    CRYPTOGRAPHY_TYPE_WOLFSSL
+    CRYPTOGRAPHY_TYPE_WOLFSSL,
+    CRYPTOGRAPHY_TYPE_CUSTOM
 } CryptographyType;
 /***************************************
 ** GVCID Managed Parameter enums
diff --git a/include/cryptography_interface.h b/include/cryptography_interface.h
index 75457782..93df7ac5 100644
--- a/include/cryptography_interface.h
+++ b/include/cryptography_interface.h
@@ -87,5 +87,6 @@ typedef struct
 CryptographyInterface get_cryptography_interface_libgcrypt(void);
 CryptographyInterface get_cryptography_interface_kmc_crypto_service(void);
 CryptographyInterface get_cryptography_interface_wolfssl(void);
+CryptographyInterface get_cryptography_interface_custom(void);
 
 #endif //CRYPTOLIB_CRYPTOGRAPHY_INTERFACE_H
diff --git a/src/core/crypto_config.c b/src/core/crypto_config.c
index 7dec1c93..4efb6bcc 100644
--- a/src/core/crypto_config.c
+++ b/src/core/crypto_config.c
@@ -241,6 +241,10 @@ int32_t Crypto_Init(void)
         cryptography_if = get_cryptography_interface_wolfssl();
     }
     if (cryptography_if == NULL)
+    {
+        cryptography_if = get_cryptography_interface_custom();
+    }
+    if (cryptography_if == NULL)
     {   // Note this needs to be the last option in the chain due to addition configuration required
         if (cryptography_kmc_crypto_config != NULL)
         {
diff --git a/src/crypto/custom_stub/cryptography_interface_custom_stub.template.c b/src/crypto/custom_stub/cryptography_interface_custom_stub.template.c
new file mode 100644
index 00000000..681df754
--- /dev/null
+++ b/src/crypto/custom_stub/cryptography_interface_custom_stub.template.c
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2021, by the California Institute of Technology.
+ * ALL RIGHTS RESERVED. United States Government Sponsorship acknowledged.
+ * Any commercial use must be negotiated with the Office of Technology
+ * Transfer at the California Institute of Technology.
+ *
+ * This software may be subject to U.S. export control laws. By accepting
+ * this software, the user agrees to comply with all applicable U.S.
+ * export laws and regulations. User has the responsibility to obtain
+ * export licenses, or other export authority as may be required before
+ * exporting such information to foreign countries or providing access to
+ * foreign persons.
+ */
+
+#include "cryptography_interface.h"
+
+CryptographyInterface get_cryptography_interface_custom(void)
+{
+    return NULL;
+}
\ No newline at end of file