1 files changed, 86 insertions, 0 deletions
diff --git a/sntrup761.sh b/sntrup761.sh
new file mode 100644
index 0000000..db4e9ae
--- /dev/null
+++ b/sntrup761.sh
@@ -0,0 +1,86 @@
+#!/bin/sh
+#       $OpenBSD: sntrup761.sh,v 1.7 2023/01/11 02:13:52 djm Exp $
+#       Placed in the Public Domain.
+#
+AUTHOR="supercop-20201130/crypto_kem/sntrup761/ref/implementors"
+FILES="
+	supercop-20201130/crypto_sort/int32/portable4/int32_minmax.inc
+	supercop-20201130/crypto_sort/int32/portable4/sort.c
+	supercop-20201130/crypto_sort/uint32/useint32/sort.c
+	supercop-20201130/crypto_kem/sntrup761/ref/uint32.c
+	supercop-20201130/crypto_kem/sntrup761/ref/int32.c
+	supercop-20201130/crypto_kem/sntrup761/ref/paramsmenu.h
+	supercop-20201130/crypto_kem/sntrup761/ref/params.h
+	supercop-20201130/crypto_kem/sntrup761/ref/Decode.h
+	supercop-20201130/crypto_kem/sntrup761/ref/Decode.c
+	supercop-20201130/crypto_kem/sntrup761/ref/Encode.h
+	supercop-20201130/crypto_kem/sntrup761/ref/Encode.c
+	supercop-20201130/crypto_kem/sntrup761/ref/kem.c
+"
+###
+
+set -e
+cd $1
+echo -n '/*  $'
+echo 'OpenBSD: $ */'
+echo
+echo '/*'
+echo ' * Public Domain, Authors:'
+sed -e '/Alphabetical order:/d' -e 's/^/ * - /' < $AUTHOR
+echo ' */'
+echo
+echo '#include <string.h>'
+echo '#include "crypto_api.h"'
+echo
+# Map the types used in this code to the ones in crypto_api.h.  We use #define
+# instead of typedef since some systems have existing intXX types and do not
+# permit multiple typedefs even if they do not conflict.
+for t in int8 uint8 int16 uint16 int32 uint32 int64 uint64; do
+	echo "#define $t crypto_${t}"
+done
+echo
+for i in $FILES; do
+	echo "/* from $i */"
+	# Changes to all files:
+	#  - remove all includes, we inline everything required.
+	#  - make functions not required elsewhere static.
+	#  - rename the functions we do use.
+	#  - remove unnecessary defines and externs.
+	sed -e "/#include/d" \
+	    -e "s/crypto_kem_/crypto_kem_sntrup761_/g" \
+	    -e "s/^void /static void /g" \
+	    -e "s/^int16 /static int16 /g" \
+	    -e "s/^uint16 /static uint16 /g" \
+	    -e "/^extern /d" \
+	    -e '/CRYPTO_NAMESPACE/d' \
+	    -e "/^#define int32 crypto_int32/d" \
+	    -e 's/[	 ]*$//' \
+	    $i | \
+	case "$i" in
+	# Use int64_t for intermediate values in int32_MINMAX to prevent signed
+	# 32-bit integer overflow when called by crypto_sort_uint32.
+	*/int32_minmax.inc)
+	    sed -e "s/int32 ab = b ^ a/int64_t ab = (int64_t)b ^ (int64_t)a/" \
+	        -e "s/int32 c = b - a/int64_t c = (int64_t)b - (int64_t)a/"
+	    ;;
+	*/int32/portable4/sort.c)
+	    sed -e "s/void crypto_sort/void crypto_sort_int32/g"
+	    ;;
+	*/uint32/useint32/sort.c)
+	    sed -e "s/void crypto_sort/void crypto_sort_uint32/g"
+	    ;;
+	# Remove unused function to prevent warning.
+	*/crypto_kem/sntrup761/ref/int32.c)
+	    sed -e '/ int32_div_uint14/,/^}$/d'
+	    ;;
+	# Remove unused function to prevent warning.
+	*/crypto_kem/sntrup761/ref/uint32.c)
+	    sed -e '/ uint32_div_uint14/,/^}$/d'
+	    ;;
+	# Default: pass through.
+	*)
+	    cat
+	    ;;
+	esac
+	echo
+done