Write private key

esp32_device/main/crypto.c

@@ -1,5 +1,7 @@
 #include "crypto.h"
 #include "system.h"
+#include "constants.h"
+#include "storage.h"
 
 #include <string.h>
 #include <mbedtls/build_info.h>
@@ -10,9 +12,6 @@
 #include <mbedtls/sha256.h>
 #include <mbedtls/pk.h>
 
-/*
- * Uncomment to force use of a specific curve
- */
 #define ECPARAMS MBEDTLS_ECP_DP_SECP256R1
 
 bool crypto_gen_priv_key()
@@ -60,7 +59,23 @@ bool crypto_gen_priv_key()
         reboot();
     }
 
-    // Show private key
+    // Export private key
+    printf("Export private key\n");
+    unsigned char *key_buff = malloc(PRV_KEY_DER_MAX_BYTES);
+    if ((ret = mbedtls_pk_write_key_der(&key, key_buff, PRV_KEY_DER_MAX_BYTES)) < 1)
+    {
+        mbedtls_printf(" failed\n  !  mbedtls_pk_write_key_der returned -0x%04x",
+                       (unsigned int)-ret);
+        reboot();
+    }
+
+    storage_set_priv_key(key_buff + PRV_KEY_DER_MAX_BYTES - ret, ret);
+
+    return true;
+}
+
+/**
+ * // Show private key
     printf("Show private key\n");
     unsigned char *key_buff = malloc(16000);
     memset(key_buff, 0, 16000);
@@ -74,6 +89,4 @@ bool crypto_gen_priv_key()
     printf("%s", key_buff);
     free(key_buff);
     printf("done\n");
-
-    return true;
-}
+*/