int* md_hex_len) {
*md_hex_len = (2*(md_len));
*md_hexdigest = new char[*md_hex_len + 1];
- for (int i = 0; i < md_len; i++) {
- snprintf((char *)(*md_hexdigest + (i*2)), 3, "%02x", md_value[i]);
+
+ char* buff = *md_hexdigest;
+ const int len = *md_hex_len;
+ for (int i = 0; i < len; i += 2) {
+ // nibble nibble
+ const int index = i / 2;
+ const char msb = (md_value[index] >> 4) & 0x0f;
+ const char lsb = md_value[index] & 0x0f;
+
+ buff[i] = (msb < 10) ? msb + '0' : (msb - 10) + 'a';
+ buff[i + 1] = (lsb < 10) ? lsb + '0' : (lsb - 10) + 'a';
}
+ // null terminator
+ buff[*md_hex_len] = '\0';
}
#define hex2i(c) ((c) <= '9' ? ((c) - '0') : (c) <= 'Z' ? ((c) - 'A' + 10) \