From b8300c0b6ee7767cfd7a23df266ba76e8521a394 Mon Sep 17 00:00:00 2001
From: Jussi Kuokkanen <jussi.kuokkanen@protonmail.com>
Date: Sun, 1 Dec 2019 13:53:07 +0200
Subject: [PATCH] lib: add SHA256 functions

---
 src/include/tc_common.h |  5 ++++-
 src/lib/tc_common.c     | 17 ++++++++++++++++-
 src/lib/tc_readable.c   |  3 ++-
 3 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/src/include/tc_common.h b/src/include/tc_common.h
index 504f809..806ef5f 100644
--- a/src/include/tc_common.h
+++ b/src/include/tc_common.h
@@ -59,10 +59,13 @@ typedef struct tc_bin_node_ {
 // Create a new node with key and data in the appropriate position
 tc_bin_node_t *tc_bin_node_insert(tc_bin_node_t* node, void *key, void *value);
 // Find the value associated with the key
-void *tc_bin_node_find_value(tc_bin_node_t *node, void *key);
+void *tc_bin_node_find_value(tc_bin_node_t *node, const void *key);
 // Destroy a node and its children
 void tc_bin_node_destroy(tc_bin_node_t *node);
 
+// Function for const char* -> SHA256. Don't free().
+const char *tc_sha256(const char *string, uint32_t string_length);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/lib/tc_common.c b/src/lib/tc_common.c
index 22a8b2f..8df21d3 100644
--- a/src/lib/tc_common.c
+++ b/src/lib/tc_common.c
@@ -1,8 +1,11 @@
 #include <tc_common.h>
 
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 
+#include <openssl/sha.h>
+
 char **tc_str_arr_dup(uint16_t str_count, char **const strings) {
     char **ptr_arr = calloc(str_count, sizeof(char*));
     for (uint16_t i = 0; i < str_count; i++) {
@@ -54,7 +57,7 @@ tc_bin_node_t *tc_bin_node_insert(tc_bin_node_t *node, void *key, void *value) {
     return node;
 }
 
-void *tc_bin_node_find_value(tc_bin_node_t *node, void *key) {
+void *tc_bin_node_find_value(tc_bin_node_t *node, const void *key) {
     if (node == NULL) {
         return NULL;
     }
@@ -71,3 +74,15 @@ void *tc_bin_node_find_value(tc_bin_node_t *node, void *key) {
 void tc_bin_node_destroy(tc_bin_node_t *node) {
     traverse_postorder(node, &single_destroy);
 }
+
+const char *tc_sha256(const char *string, uint32_t string_length) {
+    unsigned char *d = SHA256((unsigned char*) string, string_length, 0);
+    
+    static char out[(SHA256_DIGEST_LENGTH * 2) + 1];
+    
+    for (int i = 0; i < SHA256_DIGEST_LENGTH; i++) {
+        sprintf(out + (i * 2), "%02x", d[i]);
+    }
+    out[SHA256_DIGEST_LENGTH * 2] = '\0';
+    return out;
+}
diff --git a/src/lib/tc_readable.c b/src/lib/tc_readable.c
index ea469c0..de76c08 100644
--- a/src/lib/tc_readable.c
+++ b/src/lib/tc_readable.c
@@ -66,8 +66,9 @@ tc_readable_result_t tc_readable_result_create(enum tc_data_types type, void *da
             break;
         case TC_TYPE_INT:
             res.data.int_value = *(int64_t*) data;
+            break;
         case TC_TYPE_DOUBLE:
-            res.data.uint_value = *(double*) data;
+            res.data.double_value = *(double*) data;
             break;
         default:
             res.valid = false;