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siv: set key directly with gnutls

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A new function is provided by the latest gnutls (should be in 3.7.5) to
set the key of an AEAD cipher. If available, use it to avoid destroying
and creating a new SIV instance with each key change.

This improves the server NTS-NTP performance if using gnutls for SIV.
This commit is contained in:
Miroslav Lichvar
2022-05-11 08:57:22 +02:00
parent 5b04f3ca90
commit 35220aac9d
2 changed files with 21 additions and 3 deletions
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6
configure vendored
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@@ -988,6 +988,12 @@ if [ $feat_ntp = "1" ] && [ $feat_nts = "1" ] && [ $try_gnutls = "1" ]; then
then
EXTRA_OBJECTS="$EXTRA_OBJECTS siv_gnutls.o"
add_def HAVE_SIV
if test_code 'gnutls_aead_cipher_set_key()' 'gnutls/crypto.h' \
"$test_cflags" "$test_link $LIBS" '
return gnutls_aead_cipher_set_key(NULL, NULL);'
then
add_def HAVE_GNUTLS_AEAD_CIPHER_SET_KEY
fi
else
if test_code 'AES128 in nettle' 'nettle/aes.h' '' "$LIBS" \
'aes128_set_encrypt_key(NULL, NULL);'