diff --git a/lib/util.c b/lib/util.c
index d0712e3..fef1b24 100644
--- a/lib/util.c
+++ b/lib/util.c
@@ -1245,7 +1245,7 @@ ykpiv_rc ykpiv_util_reset(ykpiv_state *state) {
   return YKPIV_GENERIC_ERROR;
 }
 
-static int _slot2object(uint8_t slot) {
+uint32_t ykpiv_util_slot_object(uint8_t slot) {
   int object_id = -1;
 
   switch (slot) {
@@ -1283,7 +1283,7 @@ static ykpiv_rc _read_certificate(ykpiv_state *state, uint8_t slot, uint8_t *buf
   // TREV TODO: should this select application?
   ykpiv_rc res = YKPIV_OK;
   uint8_t *ptr = NULL;
-  int object_id = _slot2object(slot);
+  int object_id = ykpiv_util_slot_object(slot);
   size_t len = 0;
 
   if (-1 == object_id) return YKPIV_INVALID_OBJECT;
@@ -1323,7 +1323,7 @@ static ykpiv_rc _write_certificate(ykpiv_state *state, uint8_t slot, uint8_t *da
   // TREV TODO: should this select application?
   uint8_t buf[CB_OBJ_MAX];
   size_t cbBuf = sizeof(buf);
-  int object_id = _slot2object(slot);
+  int object_id = ykpiv_util_slot_object(slot);
   size_t offset = 0;
   size_t req_len = 0;
 
diff --git a/lib/ykpiv.h b/lib/ykpiv.h
index c6d8c7f..b3f80ed 100644
--- a/lib/ykpiv.h
+++ b/lib/ykpiv.h
@@ -492,6 +492,12 @@ extern "C"
    */
   ykpiv_rc ykpiv_util_block_puk(ykpiv_state *state);
 
+  /**
+   * Object ID of given slot.
+   *
+   * @param slot key slot
+   */
+  uint32_t ykpiv_util_slot_object(uint8_t slot);
 
   ykpiv_rc ykpiv_connect_with_card(ykpiv_state *state, uint64_t context, uint64_t card);
 
diff --git a/tool/util.c b/tool/util.c
index 3ae4119..0284ef2 100644
--- a/tool/util.c
+++ b/tool/util.c
@@ -300,174 +300,6 @@ int get_slot_hex(enum enum_slot slot_enum) {
   return slot;
 }
 
-int get_object_id(enum enum_slot slot) {
-  int object;
-
-  switch(slot) {
-    case slot_arg_9a:
-      object = YKPIV_OBJ_AUTHENTICATION;
-      break;
-    case slot_arg_9c:
-      object = YKPIV_OBJ_SIGNATURE;
-      break;
-    case slot_arg_9d:
-      object = YKPIV_OBJ_KEY_MANAGEMENT;
-      break;
-    case slot_arg_9e:
-      object = YKPIV_OBJ_CARD_AUTH;
-      break;
-    case slot_arg_82:
-      object = YKPIV_OBJ_RETIRED1;
-      break;
-    case slot_arg_83:
-      object = YKPIV_OBJ_RETIRED2;
-      break;
-    case slot_arg_84:
-      object = YKPIV_OBJ_RETIRED3;
-      break;
-    case slot_arg_85:
-      object = YKPIV_OBJ_RETIRED4;
-      break;
-    case slot_arg_86:
-      object = YKPIV_OBJ_RETIRED5;
-      break;
-    case slot_arg_87:
-      object = YKPIV_OBJ_RETIRED6;
-      break;
-    case slot_arg_88:
-      object = YKPIV_OBJ_RETIRED7;
-      break;
-    case slot_arg_89:
-      object = YKPIV_OBJ_RETIRED8;
-      break;
-    case slot_arg_8a:
-      object = YKPIV_OBJ_RETIRED9;
-      break;
-    case slot_arg_8b:
-      object = YKPIV_OBJ_RETIRED10;
-      break;
-    case slot_arg_8c:
-      object = YKPIV_OBJ_RETIRED11;
-      break;
-    case slot_arg_8d:
-      object = YKPIV_OBJ_RETIRED12;
-      break;
-    case slot_arg_8e:
-      object = YKPIV_OBJ_RETIRED13;
-      break;
-    case slot_arg_8f:
-      object = YKPIV_OBJ_RETIRED14;
-      break;
-    case slot_arg_90:
-      object = YKPIV_OBJ_RETIRED15;
-      break;
-    case slot_arg_91:
-      object = YKPIV_OBJ_RETIRED16;
-      break;
-    case slot_arg_92:
-      object = YKPIV_OBJ_RETIRED17;
-      break;
-    case slot_arg_93:
-      object = YKPIV_OBJ_RETIRED18;
-      break;
-    case slot_arg_94:
-      object = YKPIV_OBJ_RETIRED19;
-      break;
-    case slot_arg_95:
-      object = YKPIV_OBJ_RETIRED20;
-      break;
-    case slot_arg_f9:
-      object = YKPIV_OBJ_ATTESTATION;
-      break;
-    case slot__NULL:
-    default:
-      object = 0;
-  }
-  return object;
-}
-
-int key_to_object_id(int key) {
-  int object;
-
-  switch(key) {
-  case YKPIV_KEY_AUTHENTICATION:
-    object = YKPIV_OBJ_AUTHENTICATION;
-    break;
-  case YKPIV_KEY_CARDMGM:
-    object = YKPIV_OBJ_SIGNATURE;
-    break;
-  case YKPIV_KEY_KEYMGM:
-    object = YKPIV_OBJ_KEY_MANAGEMENT;
-    break;
-  case YKPIV_KEY_CARDAUTH:
-    object = YKPIV_OBJ_CARD_AUTH;
-    break;
-  case YKPIV_KEY_RETIRED1:
-    object = YKPIV_OBJ_RETIRED1;
-    break;
-  case YKPIV_KEY_RETIRED2:
-    object = YKPIV_OBJ_RETIRED2;
-    break;
-  case YKPIV_KEY_RETIRED3:
-    object = YKPIV_OBJ_RETIRED3;
-    break;
-  case YKPIV_KEY_RETIRED4:
-    object = YKPIV_OBJ_RETIRED4;
-    break;
-  case YKPIV_KEY_RETIRED5:
-    object = YKPIV_OBJ_RETIRED5;
-    break;
-  case YKPIV_KEY_RETIRED6:
-    object = YKPIV_OBJ_RETIRED6;
-    break;
-  case YKPIV_KEY_RETIRED7:
-    object = YKPIV_OBJ_RETIRED7;
-    break;
-  case YKPIV_KEY_RETIRED8:
-    object = YKPIV_OBJ_RETIRED8;
-    break;
-  case YKPIV_KEY_RETIRED9:
-    object = YKPIV_OBJ_RETIRED9;
-    break;
-  case YKPIV_KEY_RETIRED10:
-    object = YKPIV_OBJ_RETIRED10;
-    break;
-  case YKPIV_KEY_RETIRED11:
-    object = YKPIV_OBJ_RETIRED11;
-    break;
-  case YKPIV_KEY_RETIRED12:
-    object = YKPIV_OBJ_RETIRED12;
-    break;
-  case YKPIV_KEY_RETIRED13:
-    object = YKPIV_OBJ_RETIRED13;
-    break;
-  case YKPIV_KEY_RETIRED14:
-    object = YKPIV_OBJ_RETIRED14;
-    break;
-  case YKPIV_KEY_RETIRED15:
-    object = YKPIV_OBJ_RETIRED15;
-    break;
-  case YKPIV_KEY_RETIRED16:
-    object = YKPIV_OBJ_RETIRED16;
-    break;
-  case YKPIV_KEY_RETIRED17:
-    object = YKPIV_OBJ_RETIRED17;
-    break;
-  case YKPIV_KEY_RETIRED18:
-    object = YKPIV_OBJ_RETIRED18;
-    break;
-  case YKPIV_KEY_RETIRED19:
-    object = YKPIV_OBJ_RETIRED19;
-    break;
-  case YKPIV_KEY_RETIRED20:
-    object = YKPIV_OBJ_RETIRED20;
-    break;
-  default:
-    object = 0;
-  }
-  return object;
-}
-
 bool set_component(unsigned char *in_ptr, const BIGNUM *bn, int element_len) {
   int real_len = BN_num_bytes(bn);
 
diff --git a/tool/util.h b/tool/util.h
index a1f15b5..f1eb6ac 100644
--- a/tool/util.h
+++ b/tool/util.h
@@ -48,8 +48,6 @@ X509_NAME *parse_name(const char*);
 unsigned char get_algorithm(EVP_PKEY*);
 FILE *open_file(const char*, int);
 int get_slot_hex(enum enum_slot slot_enum);
-int get_object_id(enum enum_slot slot);
-int key_to_object_id(int key);
 bool set_component(unsigned char *in_ptr, const BIGNUM *bn, int element_len);
 bool prepare_rsa_signature(const unsigned char*, unsigned int, unsigned char*,
     unsigned int*, int);
diff --git a/tool/yubico-piv-tool.c b/tool/yubico-piv-tool.c
index b1bfd09..9b59d99 100644
--- a/tool/yubico-piv-tool.c
+++ b/tool/yubico-piv-tool.c
@@ -97,7 +97,7 @@ static bool sign_data(ykpiv_state *state, const unsigned char *in, size_t len, u
   return false;
 }
 
-static bool generate_key(ykpiv_state *state, const char *slot,
+static bool generate_key(ykpiv_state *state, enum enum_slot slot,
     enum enum_algorithm algorithm, const char *output_file_name,
     enum enum_key_format key_format, enum enum_pin_policy pin_policy,
     enum enum_touch_policy touch_policy) {
@@ -133,7 +133,7 @@ static bool generate_key(ykpiv_state *state, const char *slot,
     }
   }
 
-  sscanf(slot, "%2x", &key);
+  key = get_slot_hex(slot);
 
   output_file = open_file(output_file_name, OUTPUT);
   if(!output_file) {
@@ -252,7 +252,7 @@ static bool set_pin_retries(ykpiv_state *state, int pin_retries, int puk_retries
 }
 
 static bool import_key(ykpiv_state *state, enum enum_key_format key_format,
-                       const char *input_file_name, const char *slot, char *password,
+                       const char *input_file_name, enum enum_slot slot, char *password,
                        enum enum_pin_policy pin_policy, enum enum_touch_policy touch_policy) {
   int key = 0;
   FILE *input_file = NULL;
@@ -262,7 +262,7 @@ static bool import_key(ykpiv_state *state, enum enum_key_format key_format,
   bool ret = false;
   ykpiv_rc rc = YKPIV_GENERIC_ERROR;
 
-  sscanf(slot, "%2x", &key);
+  key = get_slot_hex(slot);
 
   input_file = open_file(input_file_name, INPUT);
   if(!input_file) {
@@ -537,7 +537,7 @@ static bool set_cardid(ykpiv_state *state, int verbose, int type) {
 }
 
 static bool request_certificate(ykpiv_state *state, enum enum_key_format key_format,
-    const char *input_file_name, const char *slot, char *subject, enum enum_hash hash,
+    const char *input_file_name, enum enum_slot slot, char *subject, enum enum_hash hash,
     const char *output_file_name) {
   X509_REQ *req = NULL;
   X509_NAME *name = NULL;
@@ -561,7 +561,7 @@ static bool request_certificate(ykpiv_state *state, enum enum_key_format key_for
   null_parameter.type = V_ASN1_NULL;
   null_parameter.value.ptr = NULL;
 
-  sscanf(slot, "%2x", &key);
+  key = get_slot_hex(slot);
 
   input_file = open_file(input_file_name, INPUT);
   output_file = open_file(output_file_name, OUTPUT);
@@ -684,7 +684,7 @@ request_out:
 }
 
 static bool selfsign_certificate(ykpiv_state *state, enum enum_key_format key_format,
-    const char *input_file_name, const char *slot, char *subject, enum enum_hash hash,
+    const char *input_file_name, enum enum_slot slot, char *subject, enum enum_hash hash,
     const int *serial, int validDays, const char *output_file_name) {
   FILE *input_file = NULL;
   FILE *output_file = NULL;
@@ -710,7 +710,7 @@ static bool selfsign_certificate(ykpiv_state *state, enum enum_key_format key_fo
   null_parameter.type = V_ASN1_NULL;
   null_parameter.value.ptr = NULL;
 
-  sscanf(slot, "%2x", &key);
+  key = get_slot_hex(slot);
 
   input_file = open_file(input_file_name, INPUT);
   output_file = open_file(output_file_name, OUTPUT);
@@ -1028,7 +1028,7 @@ read_cert_out:
 }
 
 static bool sign_file(ykpiv_state *state, const char *input, const char *output,
-    const char *slot, enum enum_algorithm algorithm, enum enum_hash hash,
+    enum enum_slot slot, enum enum_algorithm algorithm, enum enum_hash hash,
     int verbosity) {
   FILE *input_file = NULL;
   FILE *output_file = NULL;
@@ -1039,7 +1039,7 @@ static bool sign_file(ykpiv_state *state, const char *input, const char *output,
   int algo;
   const EVP_MD *md;
 
-  sscanf(slot, "%2x", &key);
+  key = get_slot_hex(slot);
 
   input_file = open_file(input, INPUT);
   if(!input_file) {
@@ -1121,7 +1121,7 @@ out:
 
 static void print_cert_info(ykpiv_state *state, enum enum_slot slot, const EVP_MD *md,
     FILE *output) {
-  int object = get_object_id(slot);
+  int object = ykpiv_util_slot_object(get_slot_hex(slot));
   int slot_name;
   unsigned char data[3072];
   const unsigned char *ptr = data;
@@ -1349,7 +1349,7 @@ static bool test_signature(ykpiv_state *state, enum enum_slot slot,
     if(algorithm == 0) {
       goto test_out;
     }
-    sscanf(cmdline_parser_slot_values[slot], "%2x", &key);
+    key = get_slot_hex(slot);
     if(YKPIV_IS_RSA(algorithm)) {
       prepare_rsa_signature(data, data_len, encoded, &enc_len, EVP_MD_type(md));
       ptr = encoded;
@@ -1454,7 +1454,7 @@ static bool test_decipher(ykpiv_state *state, enum enum_slot slot,
     if(algorithm == 0) {
       goto decipher_out;
     }
-    sscanf(cmdline_parser_slot_values[slot], "%2x", &key);
+    key = get_slot_hex(slot);
     if(YKPIV_IS_RSA(algorithm)) {
       unsigned char secret[32];
       unsigned char secret2[32];
@@ -1566,7 +1566,7 @@ static bool list_readers(ykpiv_state *state) {
   return true;
 }
 
-static bool attest(ykpiv_state *state, const char *slot,
+static bool attest(ykpiv_state *state, enum enum_slot slot,
     enum enum_key_format key_format, const char *output_file_name) {
   unsigned char data[YKPIV_OBJ_MAX_SIZE];
   unsigned long len = sizeof(data);
@@ -1583,7 +1583,7 @@ static bool attest(ykpiv_state *state, const char *slot,
     return false;
   }
 
-  sscanf(slot, "%2x", &key);
+  key = get_slot_hex(slot);
   if (ykpiv_attest(state, key, data, &len) != YKPIV_OK) {
     fprintf(stderr, "Failed to attest data.\n");
     goto attest_out;
@@ -1866,7 +1866,7 @@ int main(int argc, char *argv[]) {
         print_version(state, args_info.output_arg);
         break;
       case action_arg_generate:
-        if(generate_key(state, args_info.slot_orig, args_info.algorithm_arg, args_info.output_arg, args_info.key_format_arg,
+        if(generate_key(state, args_info.slot_arg, args_info.algorithm_arg, args_info.output_arg, args_info.key_format_arg,
               args_info.pin_policy_arg, args_info.touch_policy_arg) == false) {
           ret = EXIT_FAILURE;
         } else {
@@ -1921,7 +1921,7 @@ int main(int argc, char *argv[]) {
         }
         break;
       case action_arg_importMINUS_key:
-        if(import_key(state, args_info.key_format_arg, args_info.input_arg, args_info.slot_orig, password,
+        if(import_key(state, args_info.key_format_arg, args_info.input_arg, args_info.slot_arg, password,
               args_info.pin_policy_arg, args_info.touch_policy_arg) == false) {
           fprintf(stderr, "Unable to import private key\n");
           ret = EXIT_FAILURE;
@@ -1946,7 +1946,7 @@ int main(int argc, char *argv[]) {
         break;
       case action_arg_requestMINUS_certificate:
         if(request_certificate(state, args_info.key_format_arg, args_info.input_arg,
-              args_info.slot_orig, args_info.subject_arg, args_info.hash_arg,
+              args_info.slot_arg, args_info.subject_arg, args_info.hash_arg,
               args_info.output_arg) == false) {
           ret = EXIT_FAILURE;
         } else {
@@ -2006,7 +2006,7 @@ int main(int argc, char *argv[]) {
       }
       case action_arg_selfsignMINUS_certificate:
         if(selfsign_certificate(state, args_info.key_format_arg, args_info.input_arg,
-              args_info.slot_orig, args_info.subject_arg, args_info.hash_arg,
+              args_info.slot_arg, args_info.subject_arg, args_info.hash_arg,
               args_info.serial_given ? &args_info.serial_arg : NULL, args_info.valid_days_arg,
               args_info.output_arg) == false) {
           ret = EXIT_FAILURE;
@@ -2060,7 +2060,7 @@ int main(int argc, char *argv[]) {
         }
         break;
       case action_arg_attest:
-        if(attest(state, args_info.slot_orig, args_info.key_format_arg,
+        if(attest(state, args_info.slot_arg, args_info.key_format_arg,
               args_info.output_arg) == false) {
           ret = EXIT_FAILURE;
         }
@@ -2081,7 +2081,7 @@ int main(int argc, char *argv[]) {
       ret = EXIT_FAILURE;
     }
     else if(sign_file(state, args_info.input_arg, args_info.output_arg,
-        args_info.slot_orig, args_info.algorithm_arg, args_info.hash_arg,
+        args_info.slot_arg, args_info.algorithm_arg, args_info.hash_arg,
         verbosity)) {
       fprintf(stderr, "Signature successful!\n");
     } else {
diff --git a/ykcs11/token_vendors.c b/ykcs11/token_vendors.c
index 596d31c..395b7fe 100644
--- a/ykcs11/token_vendors.c
+++ b/ykcs11/token_vendors.c
@@ -196,7 +196,7 @@ static CK_RV COMMON_token_generate_key(ykpiv_state *state, CK_BBOOL rsa,
   *certptr++ = 0;
 
   // Store the certificate into the token
-  if (ykpiv_save_object(state, key_to_object_id(key), data, (size_t)(certptr - data)) != YKPIV_OK)
+  if (ykpiv_save_object(state, ykpiv_util_slot_object(key), data, (size_t)(certptr - data)) != YKPIV_OK)
     return CKR_DEVICE_ERROR;
 
   return CKR_OK;