--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/hash/hash.cpp	Fri Nov 13 09:26:46 2015 +0100
@@ -0,0 +1,76 @@
+/*
+ * hash.cpp -- hash functions
+ *
+ * Copyright (c) 2013-2015 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "hash.h"
+
+#include <openssl/sha.h>
+#include <openssl/md5.h>
+
+namespace hash {
+
+namespace {
+
+template <typename Context>
+using Init	= int (*)(Context *);
+
+template <typename Context>
+using Update	= int (*)(Context *, const void *, size_t);
+
+template <typename Context>
+using Final	= int (*)(unsigned char *, Context *);
+
+template <typename Context, size_t Length>
+std::string convert(const std::string &input, Init<Context> init, Update<Context> update, Final<Context> finalize)
+{
+	unsigned char digest[Length];
+	char hash[Length * 2 + 1];
+	
+	Context ctx;
+	init(&ctx);
+	update(&ctx, input.c_str(), input.length());
+	finalize(digest, &ctx);
+	
+	for (unsigned long i = 0; i < Length; i++)
+		sprintf(&hash[i * 2], "%02x", (unsigned int)digest[i]);
+	
+	return std::string(hash);
+}
+
+} // !namespace
+
+std::string md5(const std::string &input)
+{
+	return convert<MD5_CTX, MD5_DIGEST_LENGTH>(input, MD5_Init, MD5_Update, MD5_Final);
+}
+
+std::string sha1(const std::string &input)
+{
+	return convert<SHA_CTX, SHA_DIGEST_LENGTH>(input, SHA1_Init, SHA1_Update, SHA1_Final);
+}
+
+std::string sha256(const std::string &input)
+{
+	return convert<SHA256_CTX, SHA256_DIGEST_LENGTH>(input, SHA256_Init, SHA256_Update, SHA256_Final);
+}
+
+std::string sha512(const std::string &input)
+{
+	return convert<SHA512_CTX, SHA512_DIGEST_LENGTH>(input, SHA512_Init, SHA512_Update, SHA512_Final);
+}
+
+} // !hash