add missing files

lib/pbkdf2-sha1.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void sha1(const unsigned char *input, int ilen, unsigned char output[20]);
+
+void sha1_hmac(const unsigned char *key, int keylen, const unsigned char *input, int ilen, unsigned char output[20]);
+
+void PKCS5_PBKDF2_HMAC_SHA1(const unsigned char *password, size_t plen,
+    const unsigned char *salt, size_t slen,
+    const unsigned long iteration_count, const unsigned long key_length,
+    unsigned char *output);