[svn] Make the MD5 references even more generic.

Use OpenSSL's MD5 where available.
Published in <sxsg06x4f41.fsf@florida.arsdigita.de>.

src/gen-md5.c

@@ -0,0 +1,108 @@
+/* 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, 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
+}