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+#!/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