diff --git a/.gitmodules b/.gitmodules
index 8f2ea4e..35886ad 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -15,4 +15,4 @@
     url = https://github.com/solokeys/dfuse-tool
 [submodule "crypto/cifra"]
 	path = crypto/cifra
-	url = https://github.com/ctz/cifra.git
+	url = https://github.com/solokeys/cifra.git
diff --git a/fido2/ctaphid.c b/fido2/ctaphid.c
index 0885ed9..6452cde 100644
--- a/fido2/ctaphid.c
+++ b/fido2/ctaphid.c
@@ -17,7 +17,7 @@
 #include "log.h"
 #include "extensions.h"
 
-// move custom HASH512 command out,
+// move custom SHA512 command out,
 // and the following headers too
 #include "sha2.h"
 #include "crypto.h"
@@ -726,15 +726,15 @@ uint8_t ctaphid_handle_packet(uint8_t * pkt_raw)
         break;
 #endif
 #if defined(SOLO_HACKER)
-        case CTAPHID_HASH512:
+        case CTAPHID_SHA512:
             // some random logging
-            printf1(TAG_HID,"CTAPHID_HASH512\n");
+            printf1(TAG_HID,"CTAPHID_SHA512\n");
             // initialise CTAP response object
             ctap_response_init(&ctap_resp);
             // initialise write buffer
             ctaphid_write_buffer_init(&wb);
             wb.cid = cid;
-            wb.cmd = CTAPHID_HASH512;
+            wb.cmd = CTAPHID_SHA512;
             wb.bcnt = CF_SHA512_HASHSZ;  // 64 bytes
             // calculate hash
             crypto_sha512_init();
diff --git a/fido2/ctaphid.h b/fido2/ctaphid.h
index b728b0f..7224ca5 100644
--- a/fido2/ctaphid.h
+++ b/fido2/ctaphid.h
@@ -28,7 +28,8 @@
 #define CTAPHID_ENTERBOOT       (TYPE_INIT | 0x51)
 #define CTAPHID_ENTERSTBOOT     (TYPE_INIT | 0x52)
 #define CTAPHID_GETRNG          (TYPE_INIT | 0x60)
-#define CTAPHID_HASH512         (TYPE_INIT | 0x70)
+#define CTAPHID_SHA256          (TYPE_INIT | 0x70)  // not implemented
+#define CTAPHID_SHA512          (TYPE_INIT | 0x71)
 
     #define ERR_INVALID_CMD         0x01
     #define ERR_INVALID_PAR         0x02