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+/**
+ * \file md4.h
+ *
+ * \brief MD4 message digest algorithm (hash function)
+ *
+ * Copyright (C) 2006-2010, Brainspark B.V.
+ *
+ * This file is part of PolarSSL (http://www.polarssl.org)
+ * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#ifndef POLARSSL_MD4_H
+#define POLARSSL_MD4_H
+
+#include <string.h>
+
+#define POLARSSL_ERR_MD4_FILE_IO_ERROR -0x0072 /**< Read/write error in file. */
+
+/**
+ * \brief MD4 context structure
+ */
+typedef struct
+{
+ unsigned long total[2]; /*!< number of bytes processed */
+ unsigned long state[4]; /*!< intermediate digest state */
+ unsigned char buffer[64]; /*!< data block being processed */
+
+ unsigned char ipad[64]; /*!< HMAC: inner padding */
+ unsigned char opad[64]; /*!< HMAC: outer padding */
+}
+md4_context;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief MD4 context setup
+ *
+ * \param ctx context to be initialized
+ */
+void md4_starts( md4_context *ctx );
+
+/**
+ * \brief MD4 process buffer
+ *
+ * \param ctx MD4 context
+ * \param input buffer holding the data
+ * \param ilen length of the input data
+ */
+void md4_update( md4_context *ctx, const unsigned char *input, size_t ilen );
+
+/**
+ * \brief MD4 final digest
+ *
+ * \param ctx MD4 context
+ * \param output MD4 checksum result
+ */
+void md4_finish( md4_context *ctx, unsigned char output[16] );
+
+/**
+ * \brief Output = MD4( input buffer )
+ *
+ * \param input buffer holding the data
+ * \param ilen length of the input data
+ * \param output MD4 checksum result
+ */
+void md4( const unsigned char *input, size_t ilen, unsigned char output[16] );
+
+/**
+ * \brief Output = MD4( file contents )
+ *
+ * \param path input file name
+ * \param output MD4 checksum result
+ *
+ * \return 0 if successful, or POLARSSL_ERR_MD4_FILE_IO_ERROR
+ */
+int md4_file( const char *path, unsigned char output[16] );
+
+/**
+ * \brief MD4 HMAC context setup
+ *
+ * \param ctx HMAC context to be initialized
+ * \param key HMAC secret key
+ * \param keylen length of the HMAC key
+ */
+void md4_hmac_starts( md4_context *ctx, const unsigned char *key, size_t keylen );
+
+/**
+ * \brief MD4 HMAC process buffer
+ *
+ * \param ctx HMAC context
+ * \param input buffer holding the data
+ * \param ilen length of the input data
+ */
+void md4_hmac_update( md4_context *ctx, const unsigned char *input, size_t ilen );
+
+/**
+ * \brief MD4 HMAC final digest
+ *
+ * \param ctx HMAC context
+ * \param output MD4 HMAC checksum result
+ */
+void md4_hmac_finish( md4_context *ctx, unsigned char output[16] );
+
+/**
+ * \brief MD4 HMAC context reset
+ *
+ * \param ctx HMAC context to be reset
+ */
+void md4_hmac_reset( md4_context *ctx );
+
+/**
+ * \brief Output = HMAC-MD4( hmac key, input buffer )
+ *
+ * \param key HMAC secret key
+ * \param keylen length of the HMAC key
+ * \param input buffer holding the data
+ * \param ilen length of the input data
+ * \param output HMAC-MD4 result
+ */
+void md4_hmac( const unsigned char *key, size_t keylen,
+ const unsigned char *input, size_t ilen,
+ unsigned char output[16] );
+
+/**
+ * \brief Checkup routine
+ *
+ * \return 0 if successful, or 1 if the test failed
+ */
+int md4_self_test( int verbose );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* md4.h */