Add generic crypto module.

[gnulib.git] / m4 / gc.m4

diff --git a/m4/gc.m4 b/m4/gc.m4
new file mode 100644 (file)
index 0000000..a36c2a9
--- /dev/null
+++ b/m4/gc.m4
@@ -0,0 +1,102 @@
+# gc.m4 serial 1
+dnl Copyright (C) 2005 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_GC],
+[
+  AC_LIBSOURCES([gc.h, gc-gnulib.c, gc-libgcrypt.c])
+  AC_ARG_WITH(libgcrypt,
+    AS_HELP_STRING([--with-libgcrypt], [use libgcrypt for low-level crypto]),
+    libgcrypt=$withval, libgcrypt=no)
+  if test "$libgcrypt" != no; then
+    AC_LIB_HAVE_LINKFLAGS([gcrypt])
+  fi
+  if test "$ac_cv_libgcrypt" = yes; then
+    AC_CHECK_HEADER(gcrypt.h)
+    AC_LIBOBJ([gc-libgcrypt])
+  else
+    AC_LIBOBJ([gc-gnulib])
+    gl_MD5
+    gl_MEMXOR
+    gl_HMAC_MD5
+
+    # Devices with randomness.
+    # FIXME: Are these the best defaults?
+
+    case "${target}" in
+      *-openbsd*)
+       NAME_OF_RANDOM_DEVICE="/dev/srandom"
+       NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/prandom"
+       NAME_OF_NONCE_DEVICE="/dev/urandom"
+          ;;
+  
+      *-netbsd*)
+       NAME_OF_RANDOM_DEVICE="/dev/srandom"
+       NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom"
+       NAME_OF_NONCE_DEVICE="/dev/urandom"
+          ;;
+  
+      *-solaris* | *-irix* | *-dec-osf* )
+       NAME_OF_RANDOM_DEVICE="/dev/random"
+       NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/random"
+       NAME_OF_NONCE_DEVICE="/dev/random"
+          ;;
+  
+      *)
+       NAME_OF_RANDOM_DEVICE="/dev/random"
+       NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom"
+       NAME_OF_NONCE_DEVICE="/dev/urandom"
+          ;;
+    esac
+  
+    AC_MSG_CHECKING([device with (strong) random data...])
+    AC_ARG_ENABLE(random-device,
+       AC_HELP_STRING([--enable-random-device],
+               [device with (strong) randomness (for Nettle)]),
+       NAME_OF_RANDOM_DEVICE=$enableval)
+    AC_MSG_RESULT($NAME_OF_RANDOM_DEVICE)
+  
+    AC_MSG_CHECKING([device with pseudo random data...])
+    AC_ARG_ENABLE(pseudo-random-device,
+       AC_HELP_STRING([--enable-pseudo-random-device],
+               [device with pseudo randomness (for Nettle)]),
+       NAME_OF_PSEUDO_RANDOM_DEVICE=$enableval)
+    AC_MSG_RESULT($NAME_OF_PSEUDO_RANDOM_DEVICE)
+  
+    AC_MSG_CHECKING([device with unpredictable data for nonces...])
+    AC_ARG_ENABLE(nonce-device,
+       AC_HELP_STRING([--enable-nonce-device],
+               [device with unpredictable nonces (for Nettle)]),
+       NAME_OF_NONCE_DEVICE=$enableval)
+    AC_MSG_RESULT($NAME_OF_NONCE_DEVICE)
+  
+    if test "$cross_compiling" != yes; then
+      AC_CHECK_FILE($NAME_OF_RANDOM_DEVICE,, AC_MSG_ERROR([[
+        *** Device for (strong) random data $NAME_OF_RANDOM_DEVICE does not exist
+      ]]))
+      AC_CHECK_FILE($NAME_OF_PSEUDO_RANDOM_DEVICE,, AC_MSG_ERROR([[
+        *** Device for pseudo-random data $NAME_OF_PSEUDO_RANDOM_DEVICE does not exist
+      ]]))
+      AC_CHECK_FILE($NAME_OF_NONCE_DEVICE,, AC_MSG_ERROR([[
+        *** Device for unpredictable nonces $NAME_OF_NONCE_DEVICE does not exist
+      ]]))
+    else
+      AC_MSG_NOTICE([[Cross compiling, assuming random devices exists...]])  
+    fi
+  
+    # FIXME: Open+read 42 bytes+close twice and compare data.  Should differ.
+  
+    AC_DEFINE_UNQUOTED(NAME_OF_RANDOM_DEVICE, "$NAME_OF_RANDOM_DEVICE",
+                     [defined to the name of the (strong) random device])
+    AC_DEFINE_UNQUOTED(NAME_OF_PSEUDO_RANDOM_DEVICE,
+                        "$NAME_OF_PSEUDO_RANDOM_DEVICE",
+                     [defined to the name of the pseudo random device])
+    AC_DEFINE_UNQUOTED(NAME_OF_NONCE_DEVICE, "$NAME_OF_NONCE_DEVICE",
+                     [defined to the name of the unpredictable nonce device])
+  fi
+])
+
+# Prerequisites of lib/gc.h
+AC_DEFUN([gl_PREREQ_GC], [:])