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ed25519.sh
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#!/bin/sh
# $OpenBSD: ed25519.sh,v 1.2 2024/05/17 02:39:11 jsg Exp $
# Placed in the Public Domain.
#
AUTHOR="supercop-20221122/crypto_sign/ed25519/ref/implementors"
FILES="
supercop-20221122/crypto_verify/32/ref/verify.c
supercop-20221122/crypto_sign/ed25519/ref/fe25519.h
supercop-20221122/crypto_sign/ed25519/ref/fe25519.c
supercop-20221122/crypto_sign/ed25519/ref/sc25519.h
supercop-20221122/crypto_sign/ed25519/ref/sc25519.c
supercop-20221122/crypto_sign/ed25519/ref/ge25519.h
supercop-20221122/crypto_sign/ed25519/ref/ge25519.c
supercop-20221122/crypto_sign/ed25519/ref/keypair.c
supercop-20221122/crypto_sign/ed25519/ref/sign.c
supercop-20221122/crypto_sign/ed25519/ref/open.c
"
###
DATA="supercop-20221122/crypto_sign/ed25519/ref/ge25519_base.data"
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
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:
# - inline ge25519_base.data where it is included
# - expand CRYPTO_NAMESPACE() namespacing define
# - remove all includes, we inline everything required.
# - make functions not required elsewhere static.
# - rename the functions we do use.
sed \
-e "/#include \"ge25519_base.data\"/r $DATA" \
-e "/#include/d" \
-e "s/^void /static void /g" \
-e 's/CRYPTO_NAMESPACE[(]\([a-zA-Z0-9_]*\)[)]/crypto_sign_ed25519_ref_\1/g' \
$i | \
case "$i" in
*/crypto_verify/32/ref/verify.c)
# rename crypto_verify() to the name that the ed25519 code expects.
sed -e "/^#include.*/d" \
-e "s/crypto_verify/crypto_verify_32/g" \
-e "s/^int /static int /g"
;;
*/crypto_sign/ed25519/ref/sign.c)
# rename signing function to the name OpenSSH expects
sed -e "s/crypto_sign/crypto_sign_ed25519/g"
;;
*/crypto_sign/ed25519/ref/keypair.c)
# rename key generation function to the name OpenSSH expects
sed -e "s/crypto_sign_keypair/crypto_sign_ed25519_keypair/g"
;;
*/crypto_sign/ed25519/ref/open.c)
# rename verification function to the name OpenSSH expects
sed -e "s/crypto_sign_open/crypto_sign_ed25519_open/g"
;;
*/crypto_sign/ed25519/ref/fe25519.*)
# avoid a couple of name collisions with other files
sed -e "s/reduce_add_sub/fe25519_reduce_add_sub/g" \
-e "s/ equal[(]/ fe25519_equal(/g" \
-e "s/^int /static int /g"
;;
*/crypto_sign/ed25519/ref/sc25519.h)
# Lots of unused prototypes to remove
sed -e "s/^int /static int /g" \
-e '/shortsc25519_from16bytes/d' \
-e '/sc25519_iszero_vartime/d' \
-e '/sc25519_isshort_vartime/d' \
-e '/sc25519_lt_vartime/d' \
-e '/sc25519_sub_nored/d' \
-e '/sc25519_mul_shortsc/d' \
-e '/sc25519_from_shortsc/d' \
-e '/sc25519_window5/d'
;;
*/crypto_sign/ed25519/ref/sc25519.c)
# Lots of unused code to remove, some name collisions to avoid
sed -e "s/reduce_add_sub/sc25519_reduce_add_sub/g" \
-e "s/ equal[(]/ sc25519_equal(/g" \
-e "s/^int /static int /g" \
-e "s/m[[]/sc25519_m[/g" \
-e "s/mu[[]/sc25519_mu[/g" \
-e '/shortsc25519_from16bytes/,/^}$/d' \
-e '/sc25519_iszero_vartime/,/^}$/d' \
-e '/sc25519_isshort_vartime/,/^}$/d' \
-e '/sc25519_lt_vartime/,/^}$/d' \
-e '/sc25519_sub_nored/,/^}$/d' \
-e '/sc25519_mul_shortsc/,/^}$/d' \
-e '/sc25519_from_shortsc/,/^}$/d' \
-e '/sc25519_window5/,/^}$/d'
;;
*/crypto_sign/ed25519/ref//ge25519.*)
sed -e "s/^int /static int /g"
;;
# Default: pass through.
*)
cat
;;
esac | \
sed -e 's/[ ]*$//'
done