/* General MD5 support.
   Copyright (C) 2001 Free Software Foundation, Inc.

This file is part of GNU Wget.

GNU Wget 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.

GNU Wget 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 Wget; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <config.h>
#include "wget.h"

#include "gen-md5.h"

#ifdef HAVE_BUILTIN_MD5
# include <gnu-md5.h>
typedef struct md5_ctx gen_md5_context_imp;
#endif

#ifdef HAVE_SOLARIS_MD5
# include <md5.h>
typedef MD5_CTX gen_md5_context_imp;
#endif

#ifdef HAVE_OPENSSL_MD5
# include <openssl/md5.h>
typedef MD5_CTX gen_md5_context_imp;
#endif

struct gen_md5_context {
  gen_md5_context_imp imp;
};

/* Originally I planned for these to be macros, but that's very hard
   because some of these MD5 implementations use the same names for
   their types.  For example, it is impossible to include <md5.h> and
   <openssl/ssl.h> on Solaris, because the latter includes its own MD5
   implementation, which clashes with <md5.h>.  */

int
gen_md5_context_size (void)
{
  return sizeof (struct gen_md5_context);
}

void
gen_md5_init (gen_md5_context *ctx)
{
  gen_md5_context_imp *ctx_imp = &ctx->imp;

#ifdef HAVE_BUILTIN_MD5
  md5_init_ctx (ctx_imp);
#endif

#ifdef HAVE_SOLARIS_MD5
  MD5Init (ctx_imp);
#endif

#ifdef HAVE_OPENSSL_MD5
  MD5_Init (ctx_imp);
#endif
}

void
gen_md5_update (unsigned const char *buffer, int len, gen_md5_context *ctx)
{
  gen_md5_context_imp *ctx_imp = &ctx->imp;

#ifdef HAVE_BUILTIN_MD5
  md5_process_bytes (buffer, len, ctx_imp);
#endif

#ifdef HAVE_SOLARIS_MD5
  MD5Update (ctx_imp, (unsigned char *)buffer, len);
#endif

#ifdef HAVE_OPENSSL_MD5
  MD5_Update (ctx_imp, buffer, len);
#endif
}

void
gen_md5_finish (gen_md5_context *ctx, unsigned char *result)
{
  gen_md5_context_imp *ctx_imp = &ctx->imp;

#ifdef HAVE_BUILTIN_MD5
  md5_finish_ctx (ctx_imp, result);
#endif

#ifdef HAVE_SOLARIS_MD5
  MD5Final (result, ctx_imp);
#endif

#ifdef HAVE_OPENSSL_MD5
  MD5_Final (result, ctx_imp);
#endif
}