diff --git a/has_json.c b/has_json.c
index 1f1cba1..8c37272 100644
--- a/has_json.c
+++ b/has_json.c
@@ -228,12 +228,13 @@ int has_json_string_decode(char *input, size_t length,
             } else {
                 if(c == '"') c = '\"';
                 else if(c == '\\') c = '\\';
+                else if(c == '\'') c = '\'';
                 else if(c == 'b') c = '\b';
                 else if(c == 'f') c = '\f';
                 else if(c == 'n') c = '\n';
                 else if(c == 'r') c = '\r';
                 else if(c == 't') c = '\t';
-                else return -1;
+		else n[written++] = '\\';      /* keep backslash for the other caracters */
                 processed += 2;
                 n[written++] = c;
             }
@@ -459,8 +460,23 @@ int has_json_string_encode(has_json_serializer_t *s,
                 l = 6;
             } else if(c > 0x80) {
                 int32_t codepoint = 0;
-                if(((m = decode_utf8(input + stop, length - stop, &codepoint)) < 0) ||
-                   ((l = has_json_encode_unicode(codepoint, unicode)) < 0)) {
+
+		m = decode_utf8(input + stop, length - stop, &codepoint);
+		if (m < 0)   {
+			/* UTF8 decoding failed,
+			 * let's consider this caracter as high ASCII MSC caracter 
+			 */
+			char tmp[2] = {0xC0 | (c >> 6), 0x80 | (c & 0x3F)};
+			m = decode_utf8(tmp, 2, &codepoint);
+			if (m==2)
+				m = 1;
+			else 
+				m = -1;
+		}
+
+		if (m >= 0)
+			l = has_json_encode_unicode(codepoint, unicode);
+		if (m < 0 || l < 0)   {
                     return -1;
                 }
                 add = unicode;
diff --git a/has_x509.c b/has_x509.c
index dc8a73f..a9e1079 100644
--- a/has_x509.c
+++ b/has_x509.c
@@ -6,6 +6,7 @@
 #include <openssl/evp.h>
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
+#include <openssl/pem.h>
 
 static const char *hexdigits = "0123456789ABCDEF";
 static void hexdump(char *out, unsigned char *in, size_t l)
@@ -213,11 +214,43 @@ has_t *has_x509_extensions(STACK_OF(X509_EXTENSION) *exts)
 
     for(i = 0; i < j; i++) {
         has_t *cur = has_hash_new(4);
-		X509_EXTENSION *ex = sk_X509_EXTENSION_value(exts, i);
+	X509_EXTENSION *ex = sk_X509_EXTENSION_value(exts, i);
+	char *str, *ptr, *cp;
+	int num;
+
         ASN1_OBJECT *obj = X509_EXTENSION_get_object(ex);
         has_t *critical = has_int_new(X509_EXTENSION_get_critical(ex) ? 1 : 0);
         has_hash_set_str(cur, "critical", critical);
-        has_hash_set_str(cur, "value", has_string_new_str_o(ext_dump(ex), 1));
+	str = ext_dump(ex);
+
+	/* get number of tokens */
+	ptr = strdup(str);
+	for (num = 0, cp = strtok (ptr, "\n"); cp; num++)
+		cp = strtok (NULL, "\n");
+	free(ptr);
+
+	if (num == 1)   {
+		/* 'string' has element for the unique token */
+        	has_hash_set_str(cur, "value", has_string_new_str_o(str, 1));
+	}
+	else {
+		/* array of 'string' elements for the non-unique tokens */
+		has_t *value = has_array_new(num);
+		ptr = strdup(str);
+		for (cp = strtok (ptr, "\n"); cp; )   {
+			char *elem = strdup(cp);
+
+			while(isspace(*elem) || isblank(*elem))
+				memcpy(elem, elem+1, strlen(elem));
+			while(isspace(*(elem + strlen(elem) - 1)) || isblank(*(elem + strlen(elem) - 1)))
+				*(elem + strlen(elem) - 1) = '\0';
+			has_array_push(value, has_string_new_str_o(elem, 1));
+
+			cp = strtok (NULL, "\n");
+		}
+		free(ptr);
+	        has_hash_set_str(cur, "value", value);
+	}
         has_hash_set_str_o(r, oid2string(obj), cur, 1);
     }
     return r;
@@ -273,8 +306,12 @@ has_t *has_x509_new(X509 *x509)
     /* Serial number */
     if(r) {
         ASN1_INTEGER *sn = X509_get_serialNumber(x509);
-        char *serial = calloc(2 * sn->length + 1, 1);
-        hexdump(serial, sn->data, sn->length);
+        char *serial = calloc(2 * sn->length + 2, 1);
+
+        *serial = '-';
+        hexdump(serial + ((sn->type & V_ASN1_NEG) ? 1 : 0), sn->data, sn->length);
+        while(*serial == '0' && strlen(serial) > 0)
+            memcpy(serial, serial+1, strlen(serial));
         r = has_hash_set_str(crt, "serial", has_string_new_str_o(serial, 1));
     }
 
diff --git a/tests/test_json.c b/tests/test_json.c
index c691bc4..730e988 100644
--- a/tests/test_json.c
+++ b/tests/test_json.c
@@ -18,7 +18,9 @@ int main(int argc, char **argv)
         "\"delta\": { "
         "\"echo\": 1.0,"
         "\"foxtrot\": 3.1415,"
-        "\"golf\":\"éé\""
+        "\"golf\":\"éé\","
+	"\"cn1\":\"'\","
+	"\"cn2\":\"\'\""
         "}}";
     has_t *json1, *json2;
     char *out1 = NULL, *out2 = NULL;