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Implementations for scalar without data-dependent branches.

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This commit is contained in:
Pieter Wuille
2014-10-29 00:35:49 -07:00
parent 0ce80ef47e
commit 1d52a8b155
10 changed files with 1194 additions and 57 deletions
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44
configure.ac
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@@ -64,6 +64,9 @@ AC_ARG_WITH([field], [AS_HELP_STRING([--with-field=gmp|64bit|64bit_asm|32bit|aut
AC_ARG_WITH([bignum], [AS_HELP_STRING([--with-bignum=gmp|auto],
[Specify Bignum Implementation. Default is auto])],[req_bignum=$withval], [req_bignum=auto])
AC_ARG_WITH([scalar], [AS_HELP_STRING([--with-scalar=64bit|32bit|auto],
[Specify scalar implementation. Default is auto])],[req_scalar=$withval], [req_scalar=auto])
AC_CHECK_TYPES([__int128])
AC_DEFUN([SECP_INT128_CHECK],[
@@ -71,6 +74,9 @@ has_int128=$ac_cv_type___int128
if test x"$has_int128" != x"yes" && test x"$set_field" = x"64bit"; then
AC_MSG_ERROR([$set_field field support explicitly requested but is not compatible with this host])
fi
if test x"$has_int128" != x"yes" && test x"$set_scalar" = x"64bit"; then
AC_MSG_ERROR([$set_scalar scalar support explicitly requested but is not compatible with this host])
fi
])
AC_DEFUN([SECP_64BIT_ASM_CHECK],[
@@ -194,6 +200,30 @@ else
esac
fi
if test x"$req_scalar" = x"auto"; then
if test x"$set_scalar" = x; then
SECP_INT128_CHECK
if test x"$has_int128" = x"yes"; then
set_scalar=64bit
fi
fi
if test x"$set_scalar" = x; then
set_scalar=32bit
fi
else
set_scalar=$req_scalar
case $set_scalar in
64bit)
SECP_INT128_CHECK
;;
32bit)
;;
*)
AC_MSG_ERROR([invalid scalar implementation selected])
;;
esac
fi
if test x"$req_bignum" = x"auto"; then
SECP_GMP_CHECK
if test x"$has_gmp" = x"yes"; then
@@ -252,6 +282,19 @@ gmp)
;;
esac
#select scalar implementation
case $set_scalar in
64bit)
AC_DEFINE(USE_SCALAR_4X64, 1, [Define this symbol to use the 4x64 scalar implementation])
;;
32bit)
AC_DEFINE(USE_SCALAR_8X32, 1, [Define this symbol to use the 8x32 scalar implementation])
;;
*)
AC_MSG_ERROR([invalid scalar implementation])
;;
esac
if test x"$use_tests" = x"yes"; then
SECP_OPENSSL_CHECK
if test x"$has_openssl_ec" == x"yes"; then
@@ -278,6 +321,7 @@ fi
AC_MSG_NOTICE([Using field implementation: $set_field])
AC_MSG_NOTICE([Using bignum implementation: $set_bignum])
AC_MSG_NOTICE([Using scalar implementation: $set_scalar])
AC_CONFIG_HEADERS([src/libsecp256k1-config.h])
AC_CONFIG_FILES([Makefile libsecp256k1.pc])