ax_lib_crypto

Searches for the 'crypto' library with the --with... option.

If found, define HAVE_CRYPTO and macro CRYPTO_LIBS. Also defines CRYPTO_WITH_<algo> for the algorithms found available. Possible algorithms: AES BF CAMELLIA CAST DES IDEA RC2 RC5 MD2 MD4 MD5 SHA RIPEMD RSA DSA DH

The argument is used if no --with...-crypto option is set. Value "yes" requires the configuration by default. Value "no" does not require it by default. Value "auto" configures the library only if available.

See also AX_LIB_BEECRYPT and AX_LIB_GCRYPT.

# AX_CHECK_CRYPTO_LIB([algo-name],[function])
AC_DEFUN([AX_CHECK_CRYPTO_LIB],[
  AC_CHECK_LIB([crypto], $2, [
    AC_DEFINE([CRYPTO_WITH_$1],[1],[Algorithm $1 in openssl crypto library])
  ])
])

# AX_LIB_CRYPTO([yes|no|auto])
AC_DEFUN([AX_LIB_CRYPTO],[
  AC_MSG_CHECKING([whether openssl crypto is enabled])
  AC_ARG_WITH([crypto],[  --with-crypto           requite crypto library
  --without-crypto        disable crypto library],[
    AC_MSG_RESULT([$withval])
    ac_with_crypto=$withval
  ],[
    AC_MSG_RESULT([$1])
    ac_with_crypto=$1
  ])
  if test "$ac_with_crypto" = "yes" -o "$ac_with_crypto" = "auto" ; then
    AC_CHECK_HEADERS([openssl/opensslconf.h],[
      AC_CHECK_LIB([crypto], [CRYPTO_lock],[
        AC_DEFINE([HAVE_CRYPTO],[1],[Openssl crypto library is available])
        HAVE_CRYPTO=1
        AC_SUBST([CRYPTO_LIBS],[-lcrypto])
        # ciphers
        AX_CHECK_CRYPTO_LIB([AES],[AES_ecb_encrypt])
        AX_CHECK_CRYPTO_LIB([BF],[BF_ecb_encrypt])
        AX_CHECK_CRYPTO_LIB([CAST],[CAST_ecb_encrypt])
        AX_CHECK_CRYPTO_LIB([CAMELLIA],[Camellia_ecb_encrypt])
        AX_CHECK_CRYPTO_LIB([DES],[DES_ecb_encrypt])
        AX_CHECK_CRYPTO_LIB([IDEA],[idea_ecb_encrypt])
        AX_CHECK_CRYPTO_LIB([RC2],[RC2_ecb_encrypt])
        AX_CHECK_CRYPTO_LIB([RC5],[RC5_32_ecb_encrypt])
        # digests
        AX_CHECK_CRYPTO_LIB([MD2],[MD2])
        AX_CHECK_CRYPTO_LIB([MD4],[MD4])
        AX_CHECK_CRYPTO_LIB([MD5],[MD5])
        AX_CHECK_CRYPTO_LIB([RIPEMD],[RIPEMD160])
        AX_CHECK_CRYPTO_LIB([SHA],[SHA1])
        # others
        AX_CHECK_CRYPTO_LIB([RSA],[RSA_set_method])
        AX_CHECK_CRYPTO_LIB([DSA],[DSA_set_method])
        AX_CHECK_CRYPTO_LIB([DH],[DH_set_method])
      ])
    ])
    # complain only if crypto as *explicitely* required
    if test "$ac_with_crypto" = "yes" -a "x$HAVE_CRYPTO" = "x" ; then
      AC_MSG_ERROR([cannot configure required openssl crypto library])
    fi
  fi
])

Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.