add ykpiv_parse_key()

lib/error.c

@@ -49,6 +49,7 @@ static const err_t errors[] = {
   ERR (YKPIV_AUTHENTICATION_ERROR, "Error during authentication"),
   ERR (YKPIV_RANDOMNESS_ERROR, "Error getting randomness"),
   ERR (YKPIV_GENERIC_ERROR, "Something went wrong."),
+  ERR (YKPIV_KEY_ERROR, "Error in key"),
 };
 
 /**

lib/ykpiv.c

@@ -383,3 +383,33 @@ ykpiv_rc ykpiv_set_mgmkey(ykpiv_state *state, const unsigned char *new_key) {
   }
   return YKPIV_GENERIC_ERROR;
 }
+
+ykpiv_rc ykpiv_parse_key(ykpiv_state *state,
+    const char *key_in, unsigned char *key_out) {
+  unsigned int i;
+  char key_part[4] = {0};
+  int key_len = strlen(key_in);
+
+  if(key_len != DES_KEY_SZ * 3 * 2) {
+    if(state->verbose) {
+      fprintf(stderr, "Wrong key size, should be %lu characters (was %d).\n", DES_KEY_SZ * 3 * 2, key_len);
+    }
+    return YKPIV_SIZE_ERROR;
+  }
+  for(i = 0; i < DES_KEY_SZ * 3; i++) {
+    key_part[0] = *key_in++;
+    key_part[1] = *key_in++;
+    if(sscanf(key_part, "%hhx", &key_out[i]) != 1) {
+      if(state->verbose) {
+	fprintf(stderr, "Failed parsing key at position %d.\n", i);
+      }
+      return YKPIV_KEY_ERROR;
+    }
+  }
+  if(state->verbose > 1) {
+    fprintf(stderr, "parsed key: ");
+    dump_hex(key_out, DES_KEY_SZ * 3);
+    fprintf(stderr, "\n");
+  }
+  return YKPIV_OK;
+}

lib/ykpiv.h

@@ -48,6 +48,7 @@ extern "C"
 		YKPIV_AUTHENTICATION_ERROR = -5,
 		YKPIV_RANDOMNESS_ERROR = -6,
 		YKPIV_GENERIC_ERROR = -7,
+		YKPIV_KEY_ERROR = -8,
 	} ykpiv_rc;
 
 	const char *ykpiv_strerror(ykpiv_rc err);
@@ -63,6 +64,8 @@ extern "C"
 			unsigned char *data, unsigned long *recv_len, int *sw);
 	ykpiv_rc ykpiv_authenticate(ykpiv_state *state, const unsigned char *key);
 	ykpiv_rc ykpiv_set_mgmkey(ykpiv_state *state, const unsigned char *new_key);
+	ykpiv_rc ykpiv_parse_key(ykpiv_state *state,
+			const char *key_in, unsigned char *key_out);
 
 #define YKPIV_ALGO_3DES 0x03;
 #define YKPIV_ALGO_RSA1024 0x06;

lib/ykpiv.map

@@ -37,6 +37,7 @@ global:
 	ykpiv_transfer_data;
 	ykpiv_authenticate;
 	ykpiv_set_mgmkey;
+	ykpiv_parse_key;
 
 local:
 	*;