First go at using cifra for SHA512

fido2/crypto.h

@@ -19,6 +19,10 @@ void crypto_sha256_final(uint8_t * hash);
 void crypto_sha256_hmac_init(uint8_t * key, uint32_t klen, uint8_t * hmac);
 void crypto_sha256_hmac_final(uint8_t * key, uint32_t klen, uint8_t * hmac);
 
+void crypto_sha512_init();
+void crypto_sha512_update(const uint8_t * data, size_t len);
+void crypto_sha512_final(uint8_t * hash);
+
 
 void crypto_ecc256_init();
 void crypto_ecc256_derive_public_key(uint8_t * data, int len, uint8_t * x, uint8_t * y);

fido2/ctaphid.c

@@ -16,6 +16,12 @@
 #include "util.h"
 #include "log.h"
 #include "extensions.h"
+
+// move custom HASH512 command out,
+// and the following headers too
+#include "sha2.h"
+#include "crypto.h"
+
 #include APP_CONFIG
 
 typedef enum
@@ -718,6 +724,27 @@ uint8_t ctaphid_handle_packet(uint8_t * pkt_raw)
             ctaphid_write(&wb, NULL, 0);
             is_busy = 0;
         break;
+#endif
+#if defined(SOLO_HACKER)
+        case CTAPHID_HASH512:
+            // some random logging
+            printf1(TAG_HID,"CTAPHID_HASH512\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.bcnt = CF_SHA512_HASHSZ;  // 64 bytes
+            // calculate hash
+            crypto_sha512_init();
+            crypto_sha512_update(ctap_buffer, buffer_len());
+            crypto_sha512_final(ctap_buffer);
+            // copy to output
+            ctaphid_write(&wb, &ctap_buffer, CF_SHA512_HASHSZ);
+            ctaphid_write(&wb, NULL, 0);
+            is_busy = 0;
+        break;
 #endif
         default:
             printf2(TAG_ERR,"error, unimplemented HID cmd: %02x\r\n", buffer_cmd());

fido2/ctaphid.h

@@ -28,6 +28,7 @@
 #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 ERR_INVALID_CMD         0x01
     #define ERR_INVALID_PAR         0x02