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      1 #!/bin/sh
      2 #       $OpenBSD: sntrup761.sh,v 1.9 2024/09/16 05:37:05 djm Exp $
      3 #       Placed in the Public Domain.
      4 #
      5 AUTHOR="supercop-20240808/crypto_kem/sntrup761/ref/implementors"
      6 FILES=" supercop-20240808/cryptoint/crypto_int16.h
      7 	supercop-20240808/cryptoint/crypto_int32.h
      8 	supercop-20240808/cryptoint/crypto_int64.h
      9 	supercop-20240808/crypto_sort/int32/portable4/sort.c
     10 	supercop-20240808/crypto_sort/uint32/useint32/sort.c
     11 	supercop-20240808/crypto_kem/sntrup761/compact/kem.c
     12 "
     13 ###
     14 
     15 set -euo pipefail
     16 cd $1
     17 echo -n '/*  $'
     18 echo 'OpenBSD: $ */'
     19 echo
     20 echo '/*'
     21 echo ' * Public Domain, Authors:'
     22 sed -e '/Alphabetical order:/d' -e 's/^/ * - /' < $AUTHOR
     23 echo ' */'
     24 echo
     25 echo '#include <string.h>'
     26 echo '#include "crypto_api.h"'
     27 echo
     28 echo '#define crypto_declassify(x, y) do {} while (0)'
     29 echo
     30 # Map the types used in this code to the ones in crypto_api.h.  We use #define
     31 # instead of typedef since some systems have existing intXX types and do not
     32 # permit multiple typedefs even if they do not conflict.
     33 for t in int8 uint8 int16 uint16 int32 uint32 int64 uint64; do
     34 	echo "#define $t crypto_${t}"
     35 done
     36 
     37 for x in 16 32 64 ; do
     38 	echo "extern volatile crypto_int$x crypto_int${x}_optblocker;"
     39 done
     40 
     41 echo
     42 for i in $FILES; do
     43 	echo "/* from $i */"
     44 	# Changes to all files:
     45 	#  - remove all includes, we inline everything required.
     46 	#  - make functions not required elsewhere static.
     47 	#  - rename the functions we do use.
     48 	#  - remove unnecessary defines and externs.
     49 	sed -e "/#include/d" \
     50 	    -e "s/crypto_kem_/crypto_kem_sntrup761_/g" \
     51 	    -e "s/^void /static void /g" \
     52 	    -e "s/^int16 /static int16 /g" \
     53 	    -e "s/^uint16 /static uint16 /g" \
     54 	    -e "/^extern /d" \
     55 	    -e '/CRYPTO_NAMESPACE/d' \
     56 	    -e "/^#define int32 crypto_int32/d" \
     57 	    -e 's/[	 ]*$//' \
     58 	    $i | \
     59 	case "$i" in
     60 	*/cryptoint/crypto_int16.h)
     61 	    sed -e "s/static void crypto_int16_store/void crypto_int16_store/" \
     62 		-e "s/^[#]define crypto_int16_optblocker.*//" \
     63 	        -e "s/static void crypto_int16_minmax/void crypto_int16_minmax/"
     64 	    ;;
     65 	*/cryptoint/crypto_int32.h)
     66 	# Use int64_t for intermediate values in crypto_int32_minmax to
     67 	# prevent signed 32-bit integer overflow when called by
     68 	# crypto_sort_int32. Original code depends on -fwrapv (we set -ftrapv)
     69 	    sed -e "s/static void crypto_int32_store/void crypto_int32_store/" \
     70 		-e "s/^[#]define crypto_int32_optblocker.*//" \
     71 		-e "s/crypto_int32 crypto_int32_r = crypto_int32_y ^ crypto_int32_x;/crypto_int64 crypto_int32_r = (crypto_int64)crypto_int32_y ^ (crypto_int64)crypto_int32_x;/" \
     72 		-e "s/crypto_int32 crypto_int32_z = crypto_int32_y - crypto_int32_x;/crypto_int64 crypto_int32_z = (crypto_int64)crypto_int32_y - (crypto_int64)crypto_int32_x;/" \
     73 	        -e "s/static void crypto_int32_minmax/void crypto_int32_minmax/"
     74 	    ;;
     75 	*/cryptoint/crypto_int64.h)
     76 	    sed -e "s/static void crypto_int64_store/void crypto_int64_store/" \
     77 		-e "s/^[#]define crypto_int64_optblocker.*//" \
     78 	        -e "s/static void crypto_int64_minmax/void crypto_int64_minmax/"
     79 	    ;;
     80 	*/int32/portable4/sort.c)
     81 	    sed -e "s/void crypto_sort[(]/void crypto_sort_int32(/g"
     82 	    ;;
     83 	*/int32/portable5/sort.c)
     84 	    sed -e "s/crypto_sort_smallindices/crypto_sort_int32_smallindices/"\
     85 	        -e "s/void crypto_sort[(]/void crypto_sort_int32(/g"
     86 	    ;;
     87 	*/uint32/useint32/sort.c)
     88 	    sed -e "s/void crypto_sort/void crypto_sort_uint32/g"
     89 	    ;;
     90 	# Remove unused function to prevent warning.
     91 	*/crypto_kem/sntrup761/ref/int32.c)
     92 	    sed -e '/ int32_div_uint14/,/^}$/d'
     93 	    ;;
     94 	# Remove unused function to prevent warning.
     95 	*/crypto_kem/sntrup761/ref/uint32.c)
     96 	    sed -e '/ uint32_div_uint14/,/^}$/d'
     97 	    ;;
     98 	# Default: pass through.
     99 	*)
    100 	    cat
    101 	    ;;
    102 	esac
    103 	echo
    104 done
    105