Add support for libtomcrypt

configure

@@ -163,6 +163,7 @@ feat_readline=1
 try_readline=1
 try_editline=1
 try_nss=1
+try_tomcrypt=1
 feat_rtc=1
 try_rtc=0
 feat_linuxcaps=1
@@ -249,6 +250,9 @@ do
     --without-nss )
       try_nss=0
     ;;
+    --without-tomcrypt )
+      try_tomcrypt=0
+    ;;
     --host-system=* )
       OPERATINGSYSTEM=`echo $option | sed -e 's/^.*=//;'`
     ;;
@@ -493,6 +497,16 @@ if [ $try_nss = "1" ]; then
   fi
 fi
 
+if [ "x$HASH_LINK" = "x" ] && [ $try_tomcrypt = "1" ]; then
+  if test_code 'tomcrypt' 'tomcrypt.h' '-I/usr/include/tomcrypt' '-ltomcrypt' \
+    'hash_memory_multi(find_hash("md5"), NULL, NULL, NULL, 0, NULL, 0);'
+  then
+    HASH_OBJ="hash_tomcrypt.o"
+    HASH_COMPILE="-I/usr/include/tomcrypt"
+    HASH_LINK="-ltomcrypt"
+  fi
+fi
+
 SYSCONFDIR=/etc
 if [ "x$SETSYSCONFDIR" != "x" ]; then
   SYSCONFDIR=$SETSYSCONFDIR

hash_tomcrypt.c

@@ -0,0 +1,116 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Miroslav Lichvar  2011
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * 
+ * 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.
+ * 
+ **********************************************************************
+
+  =======================================================================
+
+  Routines implementing crypto hashing using tomcrypt library.
+
+  */
+
+#include <tomcrypt.h>
+
+#include "config.h"
+#include "hash.h"
+
+struct hash {
+  const char *name;
+  const char *int_name;
+  const struct ltc_hash_descriptor *desc;
+};
+
+static const struct hash hashes[] = {
+  { "MD5", "md5", &md5_desc },
+#ifdef LTC_RIPEMD128
+  { "RMD128", "rmd128", &rmd128_desc },
+#endif
+#ifdef LTC_RIPEMD160
+  { "RMD160", "rmd160", &rmd160_desc },
+#endif
+#ifdef LTC_RIPEMD256
+  { "RMD256", "rmd256", &rmd256_desc },
+#endif
+#ifdef LTC_RIPEMD320
+  { "RMD320", "rmd320", &rmd320_desc },
+#endif
+#ifdef LTC_SHA1
+  { "SHA1", "sha1", &sha1_desc },
+#endif
+#ifdef LTC_SHA256
+  { "SHA256", "sha256", &sha256_desc },
+#endif
+#ifdef LTC_SHA384
+  { "SHA384", "sha384", &sha384_desc },
+#endif
+#ifdef LTC_SHA512
+  { "SHA512", "sha512", &sha512_desc },
+#endif
+#ifdef LTC_TIGER
+  { "TIGER", "tiger", &tiger_desc },
+#endif
+#ifdef LTC_WHIRLPOOL
+  { "WHIRLPOOL", "whirlpool", &whirlpool_desc },
+#endif
+  { NULL, NULL, NULL }
+};
+
+int
+HSH_GetHashId(const char *name)
+{
+  int i, h;
+
+  for (i = 0; hashes[i].name; i++) {
+    if (!strcmp(name, hashes[i].name))
+      break;
+  }
+
+  if (!hashes[i].name)
+    return -1; /* not found */
+
+  h = find_hash(hashes[i].int_name);
+  if (h >= 0)
+    return h; /* already registered */
+  
+  /* register and try again */
+  register_hash(hashes[i].desc);
+
+  return find_hash(hashes[i].int_name);
+}
+
+unsigned int
+HSH_Hash(int id, const unsigned char *in1, unsigned int in1_len,
+    const unsigned char *in2, unsigned int in2_len,
+    unsigned char *out, unsigned int out_len)
+{
+  unsigned long len;
+  int r;
+
+  len = out_len;
+  if (in2)
+    r = hash_memory_multi(id, out, &len,
+        in1, (unsigned long)in1_len, in2, (unsigned long)in2_len, NULL, 0);
+  else
+    r = hash_memory(id, in1, in1_len, out, &len);
+
+  if (r != CRYPT_OK)
+    return 0;
+
+  return len;
+}