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dnl escape "$0x" below using the m4 quadrigaph @S|@, and escape it again with a \ for the shell.
AC_DEFUN([SECP_64BIT_ASM_CHECK],[
AC_MSG_CHECKING(for x86_64 assembly availability)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <stdint.h>]],[[
uint64_t a = 11, tmp;
__asm__ __volatile__("movq \@S|@0x100000000,%1; mulq %%rsi" : "+a"(a) : "S"(tmp) : "cc", "%rdx");
]])],[has_64bit_asm=yes],[has_64bit_asm=no])
AC_MSG_RESULT([$has_64bit_asm])
])
dnl
AC_DEFUN([SECP_OPENSSL_CHECK],[
has_libcrypto=no
m4_ifdef([PKG_CHECK_MODULES],[
PKG_CHECK_MODULES([CRYPTO], [libcrypto], [has_libcrypto=yes],[has_libcrypto=no])
if test x"$has_libcrypto" = x"yes"; then
TEMP_LIBS="$LIBS"
LIBS="$LIBS $CRYPTO_LIBS"
AC_CHECK_LIB(crypto, main,[AC_DEFINE(HAVE_LIBCRYPTO,1,[Define this symbol if libcrypto is installed])],[has_libcrypto=no])
LIBS="$TEMP_LIBS"
fi
])
if test x$has_libcrypto = xno; then
AC_CHECK_HEADER(openssl/crypto.h,[
AC_CHECK_LIB(crypto, main,[
has_libcrypto=yes
CRYPTO_LIBS=-lcrypto
AC_DEFINE(HAVE_LIBCRYPTO,1,[Define this symbol if libcrypto is installed])
])
])
LIBS=
fi
if test x"$has_libcrypto" = x"yes" && test x"$has_openssl_ec" = x; then
AC_MSG_CHECKING(for EC functions in libcrypto)
CPPFLAGS_TEMP="$CPPFLAGS"
CPPFLAGS="$CRYPTO_CPPFLAGS $CPPFLAGS"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <openssl/bn.h>
#include <openssl/ec.h>
#include <openssl/ecdsa.h>
#include <openssl/obj_mac.h>]],[[
# if OPENSSL_VERSION_NUMBER < 0x10100000L
void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps) {(void)sig->r; (void)sig->s;}
# endif
unsigned int zero = 0;
const unsigned char *zero_ptr = (unsigned char*)&zero;
EC_KEY_free(EC_KEY_new_by_curve_name(NID_secp256k1));
EC_KEY *eckey = EC_KEY_new();
EC_GROUP *group = EC_GROUP_new_by_curve_name(NID_secp256k1);
EC_KEY_set_group(eckey, group);
ECDSA_sign(0, NULL, 0, NULL, &zero, eckey);
ECDSA_verify(0, NULL, 0, NULL, 0, eckey);
o2i_ECPublicKey(&eckey, &zero_ptr, 0);
d2i_ECPrivateKey(&eckey, &zero_ptr, 0);
EC_KEY_check_key(eckey);
EC_KEY_free(eckey);
EC_GROUP_free(group);
ECDSA_SIG *sig_openssl;
sig_openssl = ECDSA_SIG_new();
d2i_ECDSA_SIG(&sig_openssl, &zero_ptr, 0);
i2d_ECDSA_SIG(sig_openssl, NULL);
ECDSA_SIG_get0(sig_openssl, NULL, NULL);
ECDSA_SIG_free(sig_openssl);
const BIGNUM *bignum = BN_value_one();
BN_is_negative(bignum);
BN_num_bits(bignum);
if (sizeof(zero) >= BN_num_bytes(bignum)) {
BN_bn2bin(bignum, (unsigned char*)&zero);
}
]])],[has_openssl_ec=yes],[has_openssl_ec=no])
AC_MSG_RESULT([$has_openssl_ec])
CPPFLAGS="$CPPFLAGS_TEMP"
fi
])
AC_DEFUN([SECP_VALGRIND_CHECK],[
if test x"$has_valgrind" != x"yes"; then
CPPFLAGS_TEMP="$CPPFLAGS"
CPPFLAGS="$VALGRIND_CPPFLAGS $CPPFLAGS"
AC_CHECK_HEADER([valgrind/memcheck.h], [has_valgrind=yes; AC_DEFINE(HAVE_VALGRIND,1,[Define this symbol if valgrind is installed])])
fi
])
dnl SECP_TRY_APPEND_CFLAGS(flags, VAR)
dnl Append flags to VAR if CC accepts them.
AC_DEFUN([SECP_TRY_APPEND_CFLAGS], [
AC_MSG_CHECKING([if ${CC} supports $1])
SECP_TRY_APPEND_CFLAGS_saved_CFLAGS="$CFLAGS"
CFLAGS="$1 $CFLAGS"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[char foo;]])], [flag_works=yes], [flag_works=no])
AC_MSG_RESULT($flag_works)
CFLAGS="$SECP_TRY_APPEND_CFLAGS_saved_CFLAGS"
if test x"$flag_works" = x"yes"; then
$2="$$2 $1"
fi
unset flag_works
AC_SUBST($2)
])
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