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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
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1 # gc-random.m4 serial 6
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2 dnl Copyright (C) 2005-2019 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_GC_RANDOM],
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8 [
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9 # Devices with randomness.
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10 # FIXME: Are these the best defaults?
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11
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12 AC_REQUIRE([AC_CANONICAL_HOST])dnl
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13
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14 case "$host_os" in
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15 *openbsd* | *mirbsd*)
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16 NAME_OF_RANDOM_DEVICE="/dev/srandom"
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17 NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/prandom"
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18 NAME_OF_NONCE_DEVICE="/dev/urandom"
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19 ;;
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20
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21 *netbsd*)
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22 NAME_OF_RANDOM_DEVICE="/dev/srandom"
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23 NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom"
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24 NAME_OF_NONCE_DEVICE="/dev/urandom"
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25 ;;
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26
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27 *solaris* | *irix* | *dec-osf* )
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28 NAME_OF_RANDOM_DEVICE="/dev/random"
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29 NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/random"
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30 NAME_OF_NONCE_DEVICE="/dev/random"
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31 ;;
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32
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33 *)
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34 NAME_OF_RANDOM_DEVICE="/dev/random"
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35 NAME_OF_PSEUDO_RANDOM_DEVICE="/dev/urandom"
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36 NAME_OF_NONCE_DEVICE="/dev/urandom"
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37 ;;
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38 esac
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39
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40 AC_MSG_CHECKING([device with (strong) random data...])
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41 AC_ARG_ENABLE([random-device],
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42 AS_HELP_STRING([--enable-random-device],
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43 [device with (strong) randomness (for Nettle)]),
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44 NAME_OF_RANDOM_DEVICE=$enableval)
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45 AC_MSG_RESULT([$NAME_OF_RANDOM_DEVICE])
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47 AC_MSG_CHECKING([device with pseudo random data...])
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48 AC_ARG_ENABLE([pseudo-random-device],
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49 AS_HELP_STRING([--enable-pseudo-random-device],
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50 [device with pseudo randomness (for Nettle)]),
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51 NAME_OF_PSEUDO_RANDOM_DEVICE=$enableval)
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52 AC_MSG_RESULT([$NAME_OF_PSEUDO_RANDOM_DEVICE])
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53
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54 AC_MSG_CHECKING([device with unpredictable data for nonces...])
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55 AC_ARG_ENABLE([nonce-device],
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56 AS_HELP_STRING([--enable-nonce-device],
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57 [device with unpredictable nonces (for Nettle)]),
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58 NAME_OF_NONCE_DEVICE=$enableval)
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59 AC_MSG_RESULT([$NAME_OF_NONCE_DEVICE])
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60
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61 if test "$cross_compiling" != yes; then
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62 if test "$NAME_OF_RANDOM_DEVICE" != "no"; then
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63 AC_CHECK_FILE([$NAME_OF_RANDOM_DEVICE],,
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64 AC_MSG_WARN([[Device '$NAME_OF_RANDOM_DEVICE' does not exist, consider to use --enable-random-device]]))
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65 fi
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66 if test "$NAME_OF_PSEUDO_RANDOM_DEVICE" != "no"; then
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67 AC_CHECK_FILE([$NAME_OF_PSEUDO_RANDOM_DEVICE],,
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68 AC_MSG_WARN([[Device '$NAME_OF_PSEUDO_RANDOM_DEVICE' does not exist, consider to use --enable-pseudo-random-device]]))
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69 fi
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70 if test "$NAME_OF_NONCE_DEVICE" != "no"; then
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71 AC_CHECK_FILE([$NAME_OF_NONCE_DEVICE],,
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72 AC_MSG_WARN([[Device '$NAME_OF_NONCE_DEVICE' does not exist, consider to use --enable-nonce-device]]))
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73 fi
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74 else
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75 AC_MSG_NOTICE([[Cross compiling, assuming random devices exists on the target host...]])
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76 fi
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77
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78 # FIXME?: Open+read 42 bytes+close twice and compare data. Should differ.
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79
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80 AC_DEFINE_UNQUOTED([NAME_OF_RANDOM_DEVICE], ["$NAME_OF_RANDOM_DEVICE"],
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81 [defined to the name of the (strong) random device])
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82 AC_DEFINE_UNQUOTED([NAME_OF_PSEUDO_RANDOM_DEVICE],
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83 "$NAME_OF_PSEUDO_RANDOM_DEVICE",
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84 [defined to the name of the pseudo random device])
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85 AC_DEFINE_UNQUOTED([NAME_OF_NONCE_DEVICE], ["$NAME_OF_NONCE_DEVICE"],
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86 [defined to the name of the unpredictable nonce device])
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87 ])