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Add X448 support in TLS 1.3

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Support for X448 was recently added to the development branch of OpenSSL 1.1.1. This PR adds an X448 key pair to etc/tls_data.txt (that was generated using OpenSSL 1.1.1) and adds X448 to the supported_groups extension for TLS 1.3 ClientHello messages.
This commit is contained in:
David Cooper
2018-03-12 13:31:29 -04:00
committed by David Cooper
parent 9618ed993d
commit 714933d607
2 changed files with 34 additions and 11 deletions
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testssl.sh
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@ -10832,9 +10832,18 @@ generate_key_share_extension() {
[[ $OSSL_VER_MAJOR.$OSSL_VER_MINOR != "1.1.1"* ]] && \
continue
# Versions of OpenSSL prior to 1.1.1 cannot perform operations
# with X448 keys, so don't include the X448 key share
# if the server's response needs to be decrypted and an
# older version of OpenSSL is being used.
[[ $i -gt 12 ]] && [[ $group -eq 30 ]] && [[ "$2" == "all" ]] && \
[[ $OSSL_VER_MAJOR.$OSSL_VER_MINOR != "1.1.1"* ]] && \
continue
# NOTE: The public keys could be extracted from the private keys
# (TLS13_KEY_SHARES) using $OPENSSL, but only OpenSSL 1.1.0 can
# extract the public key from an X25519 private key.
# (TLS13_KEY_SHARES) using $OPENSSL, but only OpenSSL 1.1.0 and newer can
# extract the public key from an X25519 private key, and only
# OpenSSL 1.1.1 can extract the public key from an X448 private key.
key_share="${TLS13_PUBLIC_KEY_SHARES[group]}"
if [[ ${#key_share} -gt 4 ]]; then
key_shares+=",$key_share"
@ -10985,21 +10994,29 @@ socksend_tls_clienthello() {
elif [[ 0x$tls_low_byte -gt 0x03 ]]; then
# Supported Groups Extension
if [[ "$process_full" != "all" ]] || \
[[ $OSSL_VER_MAJOR.$OSSL_VER_MINOR == "1.1.0"* ]] || \
[[ $OSSL_VER_MAJOR.$OSSL_VER_MINOR == "1.1.1"* ]]; then
extension_supported_groups="
00,0a, # Type: Supported Groups, see draft-ietf-tls-tls13
00,0e, 00,0c, # lengths
00,1d, 00,17, 00,18, 00,19,
00,10, 00,0e, # lengths
00,1d, 00,17, 00,1e, 00,18, 00,19,
01,00, 01,01"
else
# OpenSSL prior to 1.1.0 does not support X25519, so list it as the least
# OpenSSL prior to 1.1.1 does not support X448, so list it as the least
# preferred option if the response needs to be decrypted.
elif [[ $OSSL_VER_MAJOR.$OSSL_VER_MINOR == "1.1.0"* ]]; then
extension_supported_groups="
00,0a, # Type: Supported Groups, see draft-ietf-tls-tls13
00,0e, 00,0c, # lengths
00,10, 00,0e, # lengths
00,1d, 00,17, 00,18, 00,19,
01,00, 01,01, 00,1e"
else
# OpenSSL prior to 1.1.0 does not support either X25519 or X448,
# so list them as the least referred options if the response
# needs to be decrypted.
extension_supported_groups="
00,0a, # Type: Supported Groups, see draft-ietf-tls-tls13
00,10, 00,0e, # lengths
00,17, 00,18, 00,19,
01,00, 01,01, 00,1d"
01,00, 01,01, 00,1d, 00,1e"
fi
code2network "$extension_supported_groups"