Add a syscall to get the master public key identifier

Author: srasoamiaramanana-ledger

include/os_seed.h

@@ -298,3 +298,6 @@ WARN_UNUSED_RESULT static inline cx_err_t os_derive_eip2333_no_throw(
 // return BOLOS_TRUE if the seed has been generated, return BOLOS_FALSE otherwise.
 SYSCALL bolos_bool_t os_perso_seed_cookie(unsigned char *seed_cookie PLENGTH(CX_SHA512_SIZE));
 #endif  // HAVE_SEED_COOKIE
+
+SYSCALL bolos_err_t os_perso_get_master_key_identifier(uint8_t *identifier,
+                                                       size_t   identifier_length);

include/syscalls.h

@@ -139,6 +139,8 @@
 #define SYSCALL_os_perso_seed_cookie_ID 0x010000a8
 #endif  // HAVE_SEED_COOKIE
 
+#define SYSCALL_os_perso_get_master_key_identifier_ID 0x02000055
+
 #define SYSCALL_ENDORSEMENT_get_code_hash_ID               0x01000055
 #define SYSCALL_ENDORSEMENT_get_public_key_ID              0x03000056
 #define SYSCALL_ENDORSEMENT_get_public_key_certificate_ID  0x03000057

src/syscalls.c

@@ -1370,6 +1370,14 @@ bolos_bool_t os_perso_seed_cookie(unsigned char *seed_cookie)
 }
 #endif  // HAVE_SEED_COOKIE
 
+bolos_err_t os_perso_get_master_key_identifier(uint8_t *identifier, size_t identifier_length)
+{
+    unsigned int parameters[2];
+    parameters[0] = (unsigned int) identifier;
+    parameters[1] = (unsigned int) identifier_length;
+    return (bolos_err_t) SVC_Call(SYSCALL_os_perso_get_master_key_identifier_ID, parameters);
+}
+
 #if defined(HAVE_LEDGER_PKI)
 bolos_err_t os_pki_load_certificate(uint8_t                   expected_key_usage,
                                     uint8_t                  *certificate,