From cbcb7c1e64318a80dd72e5b09b45ab16e56e47de Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@sliepen.org>
Date: Wed, 30 Jul 2014 18:18:09 +0200
Subject: [PATCH] Add meshlink_get_fingerprint().

This function returns a (fingerprint of a) node's public key in
printable ASCII.
---
 src/meshlink.c | 21 +++++++++++++++++++++
 src/meshlink.h | 12 ++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/src/meshlink.c b/src/meshlink.c
index 84bf4e10..9fc80153 100644
--- a/src/meshlink.c
+++ b/src/meshlink.c
@@ -1013,6 +1013,27 @@ ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination)
 		return MTU;
 }
 
+char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
+	if(!mesh || !node) {
+		meshlink_errno = MESHLINK_EINVAL;
+		return NULL;
+	}
+
+	node_t *n = (node_t *)node;
+
+	if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
+		meshlink_errno = MESHLINK_EINTERNAL;
+		return false;
+	}
+
+	char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
+
+	if(!fingerprint)
+		meshlink_errno = MESHLINK_EINTERNAL;
+
+	return fingerprint;
+}
+
 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
 	if(!mesh || !name) {
 		meshlink_errno = MESHLINK_EINVAL;
diff --git a/src/meshlink.h b/src/meshlink.h
index 6672b67d..ee2c3f0a 100644
--- a/src/meshlink.h
+++ b/src/meshlink.h
@@ -277,6 +277,18 @@ extern ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *desti
  */
 extern meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name);
 
+/// Get the fingerprint of a node's public key.
+/** This function returns a fingerprint of the node's public key.
+ *  It should be treated as an opaque blob.
+ *
+ *  @param mesh         A handle which represents an instance of MeshLink.
+ *  @param node         A pointer to a meshlink_node_t describing the node.
+ *
+ *  @return		A nul-terminated C string containing the fingerprint of the node's public key in a printable ASCII format.
+ *                      The application should call free() after it is done using this string.
+ */
+extern char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node);
+
 /// Get a list of all nodes.
 /** This function returns a list with handles for all known nodes.
  *
-- 
2.39.2