add ykpiv_get_version() function

lib/ykpiv.c

@@ -535,3 +535,25 @@ ykpiv_rc ykpiv_sign_data(ykpiv_state *state,
   memcpy(sign_out, dataptr, len);
   return YKPIV_OK;
 }
+
+ykpiv_rc ykpiv_get_version(ykpiv_state *state, char *version, size_t len) {
+  APDU apdu;
+  unsigned char data[0xff];
+  unsigned long recv_len = sizeof(data);
+  int sw;
+  ykpiv_rc res;
+
+  memset(apdu.raw, 0, sizeof(apdu));
+  apdu.st.ins = YKPIV_INS_GET_VERSION;
+  if((res = ykpiv_send_data(state, apdu.raw, data, &recv_len, &sw)) != YKPIV_OK) {
+    return res;
+  } else if(sw == 0x9000) {
+    int result = snprintf(version, len, "%d.%d.%d", data[0], data[1], data[2]);
+    if(result < 0) {
+      return YKPIV_SIZE_ERROR;
+    }
+    return YKPIV_OK;
+  } else {
+    return YKPIV_GENERIC_ERROR;
+  }
+}

lib/ykpiv.h

@@ -31,6 +31,8 @@
 #define YKPIV_H
 
 #include <stdint.h>
+#include <stddef.h>
+
 #include <ykpiv-version.h>
 
 #ifdef __cplusplus
@@ -72,6 +74,7 @@ extern "C"
 	ykpiv_rc ykpiv_sign_data(ykpiv_state *state, const unsigned char *sign_in,
 			int in_len,unsigned char *sign_out, int *out_len,
 			unsigned char algorithm, unsigned char key);
+	ykpiv_rc ykpiv_get_version(ykpiv_state *state, char *version, size_t len);
 
 #define YKPIV_ALGO_3DES 0x03
 #define YKPIV_ALGO_RSA1024 0x06
@@ -88,6 +91,7 @@ extern "C"
 
 	/* Yubico vendor specific instructions */
 #define YKPIV_INS_SET_MGMKEY 0xff
+#define YKPIV_INS_GET_VERSION 0xfd
 
 #ifdef __cplusplus
 }

lib/ykpiv.map

@@ -40,6 +40,7 @@ global:
 	ykpiv_set_mgmkey;
 	ykpiv_parse_key;
 	ykpiv_sign_data;
+	ykpiv_get_version;
 
 local:
 	*;

tool/yubico-piv-tool.c

@@ -93,19 +93,11 @@ static FILE *open_file(const char*, int);
 static int get_object_id(enum enum_slot slot);
 
 static void print_version(ykpiv_state *state) {
-  APDU apdu;
-  unsigned char data[0xff];
-  unsigned long recv_len = sizeof(data);
-  int sw;
-
-  memset(apdu.raw, 0, sizeof(apdu));
-  apdu.st.ins = 0xfd;
-  if(ykpiv_send_data(state, apdu.raw, data, &recv_len, &sw) != YKPIV_OK) {
-    printf("Failed to retreive apple version.\n");
-  } else if(sw == 0x9000) {
-    printf("Applet version %d.%d.%d found.\n", data[0], data[1], data[2]);
+  char version[7];
+  if(ykpiv_get_version(state, version, sizeof(version)) == YKPIV_OK) {
+    printf("Applet version %s found.\n", version);
   } else {
-    printf("Applet version not found. Status code: %x\n", sw);
+    printf("Failed to retreive apple version.\n");
   }
 }