--- /dev/null
+/*
+ * Copyright (C) 2020 Pascal Knecht
+ * Copyright (C) 2020 Méline Sieber
+ * HSR Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include <test_suite.h>
+
+#include "tls_hkdf.h"
+
+START_TEST(test_ulfheim_handshake)
+{
+ chunk_t handshake = chunk_from_chars(
+ /* Client Hello */
+ 0x01, 0x00, 0x00, 0xc6, 0x03, 0x03, 0x00, 0x01,
+ 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
+ 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
+ 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
+ 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0xe0,
+ 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8,
+ 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0,
+ 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 0x00,
+ 0x06, 0x13, 0x01, 0x13, 0x02, 0x13, 0x03, 0x01,
+ 0x00, 0x00, 0x77, 0x00, 0x00, 0x00, 0x18, 0x00,
+ 0x16, 0x00, 0x00, 0x13, 0x65, 0x78, 0x61, 0x6d,
+ 0x70, 0x6c, 0x65, 0x2e, 0x75, 0x6c, 0x66, 0x68,
+ 0x65, 0x69, 0x6d, 0x2e, 0x6e, 0x65, 0x74, 0x00,
+ 0x0a, 0x00, 0x08, 0x00, 0x06, 0x00, 0x1d, 0x00,
+ 0x17, 0x00, 0x18, 0x00, 0x0d, 0x00, 0x14, 0x00,
+ 0x12, 0x04, 0x03, 0x08, 0x04, 0x04, 0x01, 0x05,
+ 0x03, 0x08, 0x05, 0x05, 0x01, 0x08, 0x06, 0x06,
+ 0x01, 0x02, 0x01, 0x00, 0x33, 0x00, 0x26, 0x00,
+ 0x24, 0x00, 0x1d, 0x00, 0x20, 0x35, 0x80, 0x72,
+ 0xd6, 0x36, 0x58, 0x80, 0xd1, 0xae, 0xea, 0x32,
+ 0x9a, 0xdf, 0x91, 0x21, 0x38, 0x38, 0x51, 0xed,
+ 0x21, 0xa2, 0x8e, 0x3b, 0x75, 0xe9, 0x65, 0xd0,
+ 0xd2, 0xcd, 0x16, 0x62, 0x54, 0x00, 0x2d, 0x00,
+ 0x02, 0x01, 0x01, 0x00, 0x2b, 0x00, 0x03, 0x02,
+ 0x03, 0x04,
+ /* Server Hello */
+ 0x02, 0x00, 0x00, 0x76, 0x03, 0x03, 0x70, 0x71,
+ 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
+ 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81,
+ 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
+ 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x20, 0xe0,
+ 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8,
+ 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0,
+ 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 0x13,
+ 0x01, 0x00, 0x00, 0x2e, 0x00, 0x33, 0x00, 0x24,
+ 0x00, 0x1d, 0x00, 0x20, 0x9f, 0xd7, 0xad, 0x6d,
+ 0xcf, 0xf4, 0x29, 0x8d, 0xd3, 0xf9, 0x6d, 0x5b,
+ 0x1b, 0x2a, 0xf9, 0x10, 0xa0, 0x53, 0x5b, 0x14,
+ 0x88, 0xd7, 0xf8, 0xfa, 0xbb, 0x34, 0x9a, 0x98,
+ 0x28, 0x80, 0xb6, 0x15, 0x00, 0x2b, 0x00, 0x02,
+ 0x03, 0x04,
+ );
+
+ chunk_t ecdhe = chunk_from_chars(
+ 0xdf, 0x4a, 0x29, 0x1b, 0xaa, 0x1e, 0xb7, 0xcf,
+ 0xa6, 0x93, 0x4b, 0x29, 0xb4, 0x74, 0xba, 0xad,
+ 0x26, 0x97, 0xe2, 0x9f, 0x1f, 0x92, 0x0d, 0xcc,
+ 0x77, 0xc8, 0xa0, 0xa0, 0x88, 0x44, 0x76, 0x24,
+ );
+
+ chunk_t expected_client_handshake_traffic_secret = chunk_from_chars(
+ 0xff, 0x0e, 0x5b, 0x96, 0x52, 0x91, 0xc6, 0x08,
+ 0xc1, 0xe8, 0xcd, 0x26, 0x7e, 0xef, 0xc0, 0xaf,
+ 0xcc, 0x5e, 0x98, 0xa2, 0x78, 0x63, 0x73, 0xf0,
+ 0xdb, 0x47, 0xb0, 0x47, 0x86, 0xd7, 0x2a, 0xea,
+ );
+
+ chunk_t expected_server_handshake_traffic_secret = chunk_from_chars(
+ 0xa2, 0x06, 0x72, 0x65, 0xe7, 0xf0, 0x65, 0x2a,
+ 0x92, 0x3d, 0x5d, 0x72, 0xab, 0x04, 0x67, 0xc4,
+ 0x61, 0x32, 0xee, 0xb9, 0x68, 0xb6, 0xa3, 0x2d,
+ 0x31, 0x1c, 0x80, 0x58, 0x68, 0x54, 0x88, 0x14,
+ );
+
+ chunk_t expected_client_handshake_key = chunk_from_chars(
+ 0x71, 0x54, 0xf3, 0x14, 0xe6, 0xbe, 0x7d, 0xc0,
+ 0x08, 0xdf, 0x2c, 0x83, 0x2b, 0xaa, 0x1d, 0x39,
+ );
+
+ chunk_t expected_client_handshake_iv = chunk_from_chars(
+ 0x71, 0xab, 0xc2, 0xca, 0xe4, 0xc6, 0x99, 0xd4,
+ 0x7c, 0x60, 0x02, 0x68,
+ );
+
+ chunk_t expected_server_handshake_key = chunk_from_chars(
+ 0x84, 0x47, 0x80, 0xa7, 0xac, 0xad, 0x9f, 0x98,
+ 0x0f, 0xa2, 0x5c, 0x11, 0x4e, 0x43, 0x40, 0x2a,
+ );
+
+ chunk_t expected_server_handshake_iv = chunk_from_chars(
+ 0x4c, 0x04, 0x2d, 0xdc, 0x12, 0x0a, 0x38, 0xd1,
+ 0x41, 0x7f, 0xc8, 0x15,
+ );
+
+ chunk_t expected_client_finished_key = chunk_from_chars(
+ 0x7c, 0x60, 0xf8, 0xd6, 0x34, 0x6f, 0x4a, 0x96,
+ 0x91, 0xd2, 0xae, 0x64, 0x5a, 0x78, 0x85, 0xe0,
+ 0x10, 0x4a, 0xdf, 0xf9, 0x8e, 0xba, 0x98, 0x1c,
+ 0xa2, 0xf9, 0x9e, 0xf6, 0x2b, 0xdd, 0x8f, 0xaa,
+ );
+
+ chunk_t expected_server_finished_key = chunk_from_chars(
+ 0xea, 0x84, 0xab, 0xd2, 0xad, 0xa0, 0xb5, 0xc6,
+ 0x4c, 0x08, 0x07, 0xa3, 0x26, 0xb6, 0xfd, 0x94,
+ 0xa9, 0x59, 0x7e, 0x39, 0xca, 0x62, 0x10, 0x60,
+ 0x7c, 0x0d, 0x3c, 0x8c, 0x76, 0x68, 0x65, 0x71,
+ );
+
+ chunk_t c_secret, c_key, c_iv, s_secret, s_key, s_iv, c_finished,
+ s_finished;
+
+ tls_hkdf_t *hkdf = tls_hkdf_create(HASH_SHA256, chunk_empty);
+ hkdf->set_shared_secret(hkdf, ecdhe);
+
+ /* Generate client handshake traffic secret */
+ ck_assert(hkdf->generate_secret(hkdf, TLS_HKDF_C_HS_TRAFFIC, handshake,
+ &c_secret));
+ ck_assert_chunk_eq(expected_client_handshake_traffic_secret, c_secret);
+
+ ck_assert(hkdf->derive_key(hkdf, FALSE, 16, &c_key));
+ ck_assert_chunk_eq(expected_client_handshake_key, c_key);
+
+ ck_assert(hkdf->derive_iv(hkdf, FALSE, 12, &c_iv));
+ ck_assert_chunk_eq(expected_client_handshake_iv, c_iv);
+
+ ck_assert(hkdf->derive_finished(hkdf, TRUE, &c_finished));
+ ck_assert_chunk_eq(expected_client_finished_key, c_finished);
+
+ /* Generate server handshake traffic secret */
+ ck_assert(hkdf->generate_secret(hkdf, TLS_HKDF_S_HS_TRAFFIC, handshake,
+ &s_secret));
+ ck_assert_chunk_eq(expected_server_handshake_traffic_secret, s_secret);
+
+ ck_assert(hkdf->derive_key(hkdf, TRUE, 16, &s_key));
+ ck_assert_chunk_eq(expected_server_handshake_key, s_key);
+
+ ck_assert(hkdf->derive_iv(hkdf, TRUE, 12, &s_iv));
+ ck_assert_chunk_eq(expected_server_handshake_iv, s_iv);
+
+ ck_assert(hkdf->derive_finished(hkdf, TRUE, &s_finished));
+ ck_assert_chunk_eq(expected_server_finished_key, s_finished);
+
+ hkdf->destroy(hkdf);
+
+ chunk_free(&c_secret);
+ chunk_free(&c_key);
+ chunk_free(&c_iv);
+ chunk_free(&s_secret);
+ chunk_free(&s_key);
+ chunk_free(&s_iv);
+ chunk_free(&c_finished);
+ chunk_free(&s_finished);
+}
+END_TEST
+
+START_TEST(test_ulfheim_traffic)
+{
+ chunk_t handshake = chunk_from_chars(
+ /* Client Hello */
+ 0x01, 0x00, 0x00, 0xc6, 0x03, 0x03, 0x00, 0x01,
+ 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
+ 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
+ 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
+ 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0xe0,
+ 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8,
+ 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0,
+ 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 0x00,
+ 0x06, 0x13, 0x01, 0x13, 0x02, 0x13, 0x03, 0x01,
+ 0x00, 0x00, 0x77, 0x00, 0x00, 0x00, 0x18, 0x00,
+ 0x16, 0x00, 0x00, 0x13, 0x65, 0x78, 0x61, 0x6d,
+ 0x70, 0x6c, 0x65, 0x2e, 0x75, 0x6c, 0x66, 0x68,
+ 0x65, 0x69, 0x6d, 0x2e, 0x6e, 0x65, 0x74, 0x00,
+ 0x0a, 0x00, 0x08, 0x00, 0x06, 0x00, 0x1d, 0x00,
+ 0x17, 0x00, 0x18, 0x00, 0x0d, 0x00, 0x14, 0x00,
+ 0x12, 0x04, 0x03, 0x08, 0x04, 0x04, 0x01, 0x05,
+ 0x03, 0x08, 0x05, 0x05, 0x01, 0x08, 0x06, 0x06,
+ 0x01, 0x02, 0x01, 0x00, 0x33, 0x00, 0x26, 0x00,
+ 0x24, 0x00, 0x1d, 0x00, 0x20, 0x35, 0x80, 0x72,
+ 0xd6, 0x36, 0x58, 0x80, 0xd1, 0xae, 0xea, 0x32,
+ 0x9a, 0xdf, 0x91, 0x21, 0x38, 0x38, 0x51, 0xed,
+ 0x21, 0xa2, 0x8e, 0x3b, 0x75, 0xe9, 0x65, 0xd0,
+ 0xd2, 0xcd, 0x16, 0x62, 0x54, 0x00, 0x2d, 0x00,
+ 0x02, 0x01, 0x01, 0x00, 0x2b, 0x00, 0x03, 0x02,
+ 0x03, 0x04,
+ /* Server Hello */
+ 0x02, 0x00, 0x00, 0x76, 0x03, 0x03, 0x70, 0x71,
+ 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
+ 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81,
+ 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
+ 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x20, 0xe0,
+ 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8,
+ 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0,
+ 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 0x13,
+ 0x01, 0x00, 0x00, 0x2e, 0x00, 0x33, 0x00, 0x24,
+ 0x00, 0x1d, 0x00, 0x20, 0x9f, 0xd7, 0xad, 0x6d,
+ 0xcf, 0xf4, 0x29, 0x8d, 0xd3, 0xf9, 0x6d, 0x5b,
+ 0x1b, 0x2a, 0xf9, 0x10, 0xa0, 0x53, 0x5b, 0x14,
+ 0x88, 0xd7, 0xf8, 0xfa, 0xbb, 0x34, 0x9a, 0x98,
+ 0x28, 0x80, 0xb6, 0x15, 0x00, 0x2b, 0x00, 0x02,
+ 0x03, 0x04,
+ /* Server Encrypted Extension */
+ 0x08, 0x00, 0x00, 0x02, 0x00, 0x00,
+ /* Server Certificate */
+ 0x0b, 0x00, 0x03, 0x2e, 0x00, 0x00, 0x03, 0x2a,
+ 0x00, 0x03, 0x25, 0x30, 0x82, 0x03, 0x21, 0x30,
+ 0x82, 0x02, 0x09, 0xa0, 0x03, 0x02, 0x01, 0x02,
+ 0x02, 0x08, 0x15, 0x5a, 0x92, 0xad, 0xc2, 0x04,
+ 0x8f, 0x90, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86,
+ 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x0b, 0x05,
+ 0x00, 0x30, 0x22, 0x31, 0x0b, 0x30, 0x09, 0x06,
+ 0x03, 0x55, 0x04, 0x06, 0x13, 0x02, 0x55, 0x53,
+ 0x31, 0x13, 0x30, 0x11, 0x06, 0x03, 0x55, 0x04,
+ 0x0a, 0x13, 0x0a, 0x45, 0x78, 0x61, 0x6d, 0x70,
+ 0x6c, 0x65, 0x20, 0x43, 0x41, 0x30, 0x1e, 0x17,
+ 0x0d, 0x31, 0x38, 0x31, 0x30, 0x30, 0x35, 0x30,
+ 0x31, 0x33, 0x38, 0x31, 0x37, 0x5a, 0x17, 0x0d,
+ 0x31, 0x39, 0x31, 0x30, 0x30, 0x35, 0x30, 0x31,
+ 0x33, 0x38, 0x31, 0x37, 0x5a, 0x30, 0x2b, 0x31,
+ 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06,
+ 0x13, 0x02, 0x55, 0x53, 0x31, 0x1c, 0x30, 0x1a,
+ 0x06, 0x03, 0x55, 0x04, 0x03, 0x13, 0x13, 0x65,
+ 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x2e, 0x75,
+ 0x6c, 0x66, 0x68, 0x65, 0x69, 0x6d, 0x2e, 0x6e,
+ 0x65, 0x74, 0x30, 0x82, 0x01, 0x22, 0x30, 0x0d,
+ 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
+ 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01,
+ 0x0f, 0x00, 0x30, 0x82, 0x01, 0x0a, 0x02, 0x82,
+ 0x01, 0x01, 0x00, 0xc4, 0x80, 0x36, 0x06, 0xba,
+ 0xe7, 0x47, 0x6b, 0x08, 0x94, 0x04, 0xec, 0xa7,
+ 0xb6, 0x91, 0x04, 0x3f, 0xf7, 0x92, 0xbc, 0x19,
+ 0xee, 0xfb, 0x7d, 0x74, 0xd7, 0xa8, 0x0d, 0x00,
+ 0x1e, 0x7b, 0x4b, 0x3a, 0x4a, 0xe6, 0x0f, 0xe8,
+ 0xc0, 0x71, 0xfc, 0x73, 0xe7, 0x02, 0x4c, 0x0d,
+ 0xbc, 0xf4, 0xbd, 0xd1, 0x1d, 0x39, 0x6b, 0xba,
+ 0x70, 0x46, 0x4a, 0x13, 0xe9, 0x4a, 0xf8, 0x3d,
+ 0xf3, 0xe1, 0x09, 0x59, 0x54, 0x7b, 0xc9, 0x55,
+ 0xfb, 0x41, 0x2d, 0xa3, 0x76, 0x52, 0x11, 0xe1,
+ 0xf3, 0xdc, 0x77, 0x6c, 0xaa, 0x53, 0x37, 0x6e,
+ 0xca, 0x3a, 0xec, 0xbe, 0xc3, 0xaa, 0xb7, 0x3b,
+ 0x31, 0xd5, 0x6c, 0xb6, 0x52, 0x9c, 0x80, 0x98,
+ 0xbc, 0xc9, 0xe0, 0x28, 0x18, 0xe2, 0x0b, 0xf7,
+ 0xf8, 0xa0, 0x3a, 0xfd, 0x17, 0x04, 0x50, 0x9e,
+ 0xce, 0x79, 0xbd, 0x9f, 0x39, 0xf1, 0xea, 0x69,
+ 0xec, 0x47, 0x97, 0x2e, 0x83, 0x0f, 0xb5, 0xca,
+ 0x95, 0xde, 0x95, 0xa1, 0xe6, 0x04, 0x22, 0xd5,
+ 0xee, 0xbe, 0x52, 0x79, 0x54, 0xa1, 0xe7, 0xbf,
+ 0x8a, 0x86, 0xf6, 0x46, 0x6d, 0x0d, 0x9f, 0x16,
+ 0x95, 0x1a, 0x4c, 0xf7, 0xa0, 0x46, 0x92, 0x59,
+ 0x5c, 0x13, 0x52, 0xf2, 0x54, 0x9e, 0x5a, 0xfb,
+ 0x4e, 0xbf, 0xd7, 0x7a, 0x37, 0x95, 0x01, 0x44,
+ 0xe4, 0xc0, 0x26, 0x87, 0x4c, 0x65, 0x3e, 0x40,
+ 0x7d, 0x7d, 0x23, 0x07, 0x44, 0x01, 0xf4, 0x84,
+ 0xff, 0xd0, 0x8f, 0x7a, 0x1f, 0xa0, 0x52, 0x10,
+ 0xd1, 0xf4, 0xf0, 0xd5, 0xce, 0x79, 0x70, 0x29,
+ 0x32, 0xe2, 0xca, 0xbe, 0x70, 0x1f, 0xdf, 0xad,
+ 0x6b, 0x4b, 0xb7, 0x11, 0x01, 0xf4, 0x4b, 0xad,
+ 0x66, 0x6a, 0x11, 0x13, 0x0f, 0xe2, 0xee, 0x82,
+ 0x9e, 0x4d, 0x02, 0x9d, 0xc9, 0x1c, 0xdd, 0x67,
+ 0x16, 0xdb, 0xb9, 0x06, 0x18, 0x86, 0xed, 0xc1,
+ 0xba, 0x94, 0x21, 0x02, 0x03, 0x01, 0x00, 0x01,
+ 0xa3, 0x52, 0x30, 0x50, 0x30, 0x0e, 0x06, 0x03,
+ 0x55, 0x1d, 0x0f, 0x01, 0x01, 0xff, 0x04, 0x04,
+ 0x03, 0x02, 0x05, 0xa0, 0x30, 0x1d, 0x06, 0x03,
+ 0x55, 0x1d, 0x25, 0x04, 0x16, 0x30, 0x14, 0x06,
+ 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x03,
+ 0x02, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05,
+ 0x07, 0x03, 0x01, 0x30, 0x1f, 0x06, 0x03, 0x55,
+ 0x1d, 0x23, 0x04, 0x18, 0x30, 0x16, 0x80, 0x14,
+ 0x89, 0x4f, 0xde, 0x5b, 0xcc, 0x69, 0xe2, 0x52,
+ 0xcf, 0x3e, 0xa3, 0x00, 0xdf, 0xb1, 0x97, 0xb8,
+ 0x1d, 0xe1, 0xc1, 0x46, 0x30, 0x0d, 0x06, 0x09,
+ 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01,
+ 0x0b, 0x05, 0x00, 0x03, 0x82, 0x01, 0x01, 0x00,
+ 0x59, 0x16, 0x45, 0xa6, 0x9a, 0x2e, 0x37, 0x79,
+ 0xe4, 0xf6, 0xdd, 0x27, 0x1a, 0xba, 0x1c, 0x0b,
+ 0xfd, 0x6c, 0xd7, 0x55, 0x99, 0xb5, 0xe7, 0xc3,
+ 0x6e, 0x53, 0x3e, 0xff, 0x36, 0x59, 0x08, 0x43,
+ 0x24, 0xc9, 0xe7, 0xa5, 0x04, 0x07, 0x9d, 0x39,
+ 0xe0, 0xd4, 0x29, 0x87, 0xff, 0xe3, 0xeb, 0xdd,
+ 0x09, 0xc1, 0xcf, 0x1d, 0x91, 0x44, 0x55, 0x87,
+ 0x0b, 0x57, 0x1d, 0xd1, 0x9b, 0xdf, 0x1d, 0x24,
+ 0xf8, 0xbb, 0x9a, 0x11, 0xfe, 0x80, 0xfd, 0x59,
+ 0x2b, 0xa0, 0x39, 0x8c, 0xde, 0x11, 0xe2, 0x65,
+ 0x1e, 0x61, 0x8c, 0xe5, 0x98, 0xfa, 0x96, 0xe5,
+ 0x37, 0x2e, 0xef, 0x3d, 0x24, 0x8a, 0xfd, 0xe1,
+ 0x74, 0x63, 0xeb, 0xbf, 0xab, 0xb8, 0xe4, 0xd1,
+ 0xab, 0x50, 0x2a, 0x54, 0xec, 0x00, 0x64, 0xe9,
+ 0x2f, 0x78, 0x19, 0x66, 0x0d, 0x3f, 0x27, 0xcf,
+ 0x20, 0x9e, 0x66, 0x7f, 0xce, 0x5a, 0xe2, 0xe4,
+ 0xac, 0x99, 0xc7, 0xc9, 0x38, 0x18, 0xf8, 0xb2,
+ 0x51, 0x07, 0x22, 0xdf, 0xed, 0x97, 0xf3, 0x2e,
+ 0x3e, 0x93, 0x49, 0xd4, 0xc6, 0x6c, 0x9e, 0xa6,
+ 0x39, 0x6d, 0x74, 0x44, 0x62, 0xa0, 0x6b, 0x42,
+ 0xc6, 0xd5, 0xba, 0x68, 0x8e, 0xac, 0x3a, 0x01,
+ 0x7b, 0xdd, 0xfc, 0x8e, 0x2c, 0xfc, 0xad, 0x27,
+ 0xcb, 0x69, 0xd3, 0xcc, 0xdc, 0xa2, 0x80, 0x41,
+ 0x44, 0x65, 0xd3, 0xae, 0x34, 0x8c, 0xe0, 0xf3,
+ 0x4a, 0xb2, 0xfb, 0x9c, 0x61, 0x83, 0x71, 0x31,
+ 0x2b, 0x19, 0x10, 0x41, 0x64, 0x1c, 0x23, 0x7f,
+ 0x11, 0xa5, 0xd6, 0x5c, 0x84, 0x4f, 0x04, 0x04,
+ 0x84, 0x99, 0x38, 0x71, 0x2b, 0x95, 0x9e, 0xd6,
+ 0x85, 0xbc, 0x5c, 0x5d, 0xd6, 0x45, 0xed, 0x19,
+ 0x90, 0x94, 0x73, 0x40, 0x29, 0x26, 0xdc, 0xb4,
+ 0x0e, 0x34, 0x69, 0xa1, 0x59, 0x41, 0xe8, 0xe2,
+ 0xcc, 0xa8, 0x4b, 0xb6, 0x08, 0x46, 0x36, 0xa0,
+ 0x00, 0x00,
+ /* Server Certificate Verify */
+ 0x0f, 0x00, 0x01, 0x04, 0x08, 0x04, 0x01, 0x00,
+ 0x17, 0xfe, 0xb5, 0x33, 0xca, 0x6d, 0x00, 0x7d,
+ 0x00, 0x58, 0x25, 0x79, 0x68, 0x42, 0x4b, 0xbc,
+ 0x3a, 0xa6, 0x90, 0x9e, 0x9d, 0x49, 0x55, 0x75,
+ 0x76, 0xa5, 0x20, 0xe0, 0x4a, 0x5e, 0xf0, 0x5f,
+ 0x0e, 0x86, 0xd2, 0x4f, 0xf4, 0x3f, 0x8e, 0xb8,
+ 0x61, 0xee, 0xf5, 0x95, 0x22, 0x8d, 0x70, 0x32,
+ 0xaa, 0x36, 0x0f, 0x71, 0x4e, 0x66, 0x74, 0x13,
+ 0x92, 0x6e, 0xf4, 0xf8, 0xb5, 0x80, 0x3b, 0x69,
+ 0xe3, 0x55, 0x19, 0xe3, 0xb2, 0x3f, 0x43, 0x73,
+ 0xdf, 0xac, 0x67, 0x87, 0x06, 0x6d, 0xcb, 0x47,
+ 0x56, 0xb5, 0x45, 0x60, 0xe0, 0x88, 0x6e, 0x9b,
+ 0x96, 0x2c, 0x4a, 0xd2, 0x8d, 0xab, 0x26, 0xba,
+ 0xd1, 0xab, 0xc2, 0x59, 0x16, 0xb0, 0x9a, 0xf2,
+ 0x86, 0x53, 0x7f, 0x68, 0x4f, 0x80, 0x8a, 0xef,
+ 0xee, 0x73, 0x04, 0x6c, 0xb7, 0xdf, 0x0a, 0x84,
+ 0xfb, 0xb5, 0x96, 0x7a, 0xca, 0x13, 0x1f, 0x4b,
+ 0x1c, 0xf3, 0x89, 0x79, 0x94, 0x03, 0xa3, 0x0c,
+ 0x02, 0xd2, 0x9c, 0xbd, 0xad, 0xb7, 0x25, 0x12,
+ 0xdb, 0x9c, 0xec, 0x2e, 0x5e, 0x1d, 0x00, 0xe5,
+ 0x0c, 0xaf, 0xcf, 0x6f, 0x21, 0x09, 0x1e, 0xbc,
+ 0x4f, 0x25, 0x3c, 0x5e, 0xab, 0x01, 0xa6, 0x79,
+ 0xba, 0xea, 0xbe, 0xed, 0xb9, 0xc9, 0x61, 0x8f,
+ 0x66, 0x00, 0x6b, 0x82, 0x44, 0xd6, 0x62, 0x2a,
+ 0xaa, 0x56, 0x88, 0x7c, 0xcf, 0xc6, 0x6a, 0x0f,
+ 0x38, 0x51, 0xdf, 0xa1, 0x3a, 0x78, 0xcf, 0xf7,
+ 0x99, 0x1e, 0x03, 0xcb, 0x2c, 0x3a, 0x0e, 0xd8,
+ 0x7d, 0x73, 0x67, 0x36, 0x2e, 0xb7, 0x80, 0x5b,
+ 0x00, 0xb2, 0x52, 0x4f, 0xf2, 0x98, 0xa4, 0xda,
+ 0x48, 0x7c, 0xac, 0xde, 0xaf, 0x8a, 0x23, 0x36,
+ 0xc5, 0x63, 0x1b, 0x3e, 0xfa, 0x93, 0x5b, 0xb4,
+ 0x11, 0xe7, 0x53, 0xca, 0x13, 0xb0, 0x15, 0xfe,
+ 0xc7, 0xe4, 0xa7, 0x30, 0xf1, 0x36, 0x9f, 0x9e,
+ /* Server Handshake Finish */
+ 0x14, 0x00, 0x00, 0x20, 0xea, 0x6e, 0xe1, 0x76,
+ 0xdc, 0xcc, 0x4a, 0xf1, 0x85, 0x9e, 0x9e, 0x4e,
+ 0x93, 0xf7, 0x97, 0xea, 0xc9, 0xa7, 0x8c, 0xe4,
+ 0x39, 0x30, 0x1e, 0x35, 0x27, 0x5a, 0xd4, 0x3f,
+ 0x3c, 0xdd, 0xbd, 0xe3,
+ );
+
+ chunk_t ecdhe = chunk_from_chars(
+ 0xdf, 0x4a, 0x29, 0x1b, 0xaa, 0x1e, 0xb7, 0xcf,
+ 0xa6, 0x93, 0x4b, 0x29, 0xb4, 0x74, 0xba, 0xad,
+ 0x26, 0x97, 0xe2, 0x9f, 0x1f, 0x92, 0x0d, 0xcc,
+ 0x77, 0xc8, 0xa0, 0xa0, 0x88, 0x44, 0x76, 0x24,
+ );
+
+ chunk_t expected_client_application_key = chunk_from_chars(
+ 0x49, 0x13, 0x4b, 0x95, 0x32, 0x8f, 0x27, 0x9f,
+ 0x01, 0x83, 0x86, 0x05, 0x89, 0xac, 0x67, 0x07,
+ );
+
+ chunk_t expected_client_application_iv = chunk_from_chars(
+ 0xbc, 0x4d, 0xd5, 0xf7, 0xb9, 0x8a, 0xcf, 0xf8,
+ 0x54, 0x66, 0x26, 0x1d,
+ );
+
+ chunk_t expected_server_application_key = chunk_from_chars(
+ 0x0b, 0x6d, 0x22, 0xc8, 0xff, 0x68, 0x09, 0x7e,
+ 0xa8, 0x71, 0xc6, 0x72, 0x07, 0x37, 0x73, 0xbf,
+ );
+
+ chunk_t expected_server_application_iv = chunk_from_chars(
+ 0x1b, 0x13, 0xdd, 0x9f, 0x8d, 0x8f, 0x17, 0x09,
+ 0x1d, 0x34, 0xb3, 0x49,
+ );
+
+ chunk_t c_key, c_iv, s_key, s_iv;
+
+ tls_hkdf_t *hkdf = tls_hkdf_create(HASH_SHA256, chunk_empty);
+ hkdf->set_shared_secret(hkdf, ecdhe);
+
+ /* Generate client application traffic secret */
+ ck_assert(hkdf->generate_secret(hkdf, TLS_HKDF_C_AP_TRAFFIC, handshake, NULL));
+
+ ck_assert(hkdf->derive_key(hkdf, FALSE, 16, &c_key));
+ ck_assert_chunk_eq(expected_client_application_key, c_key);
+
+ ck_assert(hkdf->derive_iv(hkdf, FALSE, 12, &c_iv));
+ ck_assert_chunk_eq(expected_client_application_iv, c_iv);
+
+ /* Generate server application traffic secret */
+ ck_assert(hkdf->generate_secret(hkdf, TLS_HKDF_S_AP_TRAFFIC, handshake, NULL));
+
+ ck_assert(hkdf->derive_key(hkdf, TRUE, 16, &s_key));
+ ck_assert_chunk_eq(expected_server_application_key, s_key);
+
+ ck_assert(hkdf->derive_iv(hkdf, TRUE, 12, &s_iv));
+ ck_assert_chunk_eq(expected_server_application_iv, s_iv);
+
+ hkdf->destroy(hkdf);
+
+ chunk_free(&c_key);
+ chunk_free(&c_iv);
+ chunk_free(&s_key);
+ chunk_free(&s_iv);
+}
+END_TEST
+
+Suite *hkdf_suite_create()
+{
+ Suite *s;
+ TCase *tc;
+
+ s = suite_create("HKDF TLS 1.3");
+
+ tc = tcase_create("Ulfheim Keys");
+ tcase_add_test(tc, test_ulfheim_handshake);
+ tcase_add_test(tc, test_ulfheim_traffic);
+ suite_add_tcase(s, tc);
+
+ return s;
+}
--- /dev/null
+/*
+ * Copyright (C) 2020 Pascal Knecht
+ * Copyright (C) 2020 Méline Sieber
+ * HSR Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include "tls_hkdf.h"
+
+#include <bio/bio_writer.h>
+#include <crypto/prf_plus.h>
+
+typedef struct private_tls_hkdf_t private_tls_hkdf_t;
+
+typedef enum hkdf_phase {
+ HKDF_PHASE_0,
+ HKDF_PHASE_1,
+ HKDF_PHASE_2,
+ HKDF_PHASE_3,
+} hkdf_phase;
+
+struct private_tls_hkdf_t {
+
+ /**
+ * Public tls_hkdf_t interface.
+ */
+ struct tls_hkdf_t public;
+
+ /**
+ * Phase we are in.
+ */
+ hkdf_phase phase;
+
+ /**
+ * Hash algorithm used.
+ */
+ hash_algorithm_t hash_algorithm;
+
+ /**
+ * Pseudorandom function used.
+ */
+ prf_t *prf;
+
+ /**
+ * Hasher used.
+ */
+ hasher_t *hasher;
+
+ /**
+ * (EC)DHE as IKM to switch from phase 1 to phase 2
+ */
+ chunk_t shared_secret;
+
+ /**
+ * IKM used.
+ */
+ chunk_t ikm;
+
+ /**
+ * PRK used.
+ */
+ chunk_t prk;
+
+ /**
+ * OKM used.
+ */
+ chunk_t okm;
+
+ /**
+ * Current implementation needs a copy of derived secrets to calculate the
+ * proper finished key.
+ */
+ chunk_t client_traffic_secret;
+ chunk_t server_traffic_secret;
+};
+
+static char *hkdf_labels[] = {
+ "tls13 ext binder",
+ "tls13 res binder",
+ "tls13 c e traffic",
+ "tls13 e exp master",
+ "tls13 c hs traffic",
+ "tls13 s hs traffic",
+ "tls13 c ap traffic",
+ "tls13 s ap traffic",
+ "tls13 exp master",
+ "tls13 res master",
+};
+
+/**
+ * Step 1: Extract, as defined in RFC 5869, section 2.2:
+ * HKDF-Extract(salt, IKM) -> PRK
+ */
+static bool extract(private_tls_hkdf_t *this, chunk_t salt, chunk_t ikm,
+ chunk_t *prk)
+{
+ if (!this->prf->set_key(this->prf, salt))
+ {
+ DBG1(DBG_TLS, "unable to set PRF salt");
+ return FALSE;
+ }
+ chunk_clear(prk);
+ if(!this->prf->allocate_bytes(this->prf, ikm, prk))
+ {
+ DBG1(DBG_TLS, "unable to allocate PRF space");
+ return FALSE;
+ }
+
+ DBG4(DBG_TLS, "PRK: %B", prk);
+
+ return TRUE;
+}
+
+/**
+ * Step 2: Expand as defined in RFC 5869, section 2.3:
+ * HKDF-Expand(PRK, info, L) -> OKM
+ */
+static bool expand(private_tls_hkdf_t *this, chunk_t prk, chunk_t info,
+ size_t length, chunk_t *okm)
+{
+ if (!this->prf->set_key(this->prf, prk))
+ {
+ DBG1(DBG_TLS, "unable to set PRF PRK");
+ return FALSE;
+ }
+ prf_plus_t *prf_plus = prf_plus_create(this->prf, TRUE, info);
+ chunk_clear(&this->okm);
+ if (!prf_plus || !prf_plus->allocate_bytes(prf_plus, length, okm))
+ {
+ DBG1(DBG_TLS, "unable to allocate PRF plus space");
+ DESTROY_IF(prf_plus);
+ chunk_clear(okm);
+ return FALSE;
+ }
+ DESTROY_IF(prf_plus);
+
+ DBG4(DBG_TLS, "OKM: %B", okm);
+
+ return TRUE;
+}
+
+/**
+ * Expand-Label as defined in RFC 8446, section 7.1:
+ * HKDF-Expand-Label(Secret, Label, Context, Length) -> OKM
+ */
+static bool expand_label(private_tls_hkdf_t *this, chunk_t secret,
+ chunk_t label, chunk_t context, uint16_t length,
+ chunk_t *key)
+{
+ bool success;
+
+ if (label.len < 7 || label.len > 255 || context.len > 255)
+ {
+ return FALSE;
+ }
+
+ /* HKDFLabel as defined in RFC 8446, section 7.1 */
+ bio_writer_t *writer = bio_writer_create(0);
+ writer->write_uint16(writer, length);
+ writer->write_data8(writer, label);
+ writer->write_data8(writer, context);
+
+ success = expand(this, secret, writer->get_buf(writer), length, key);
+ writer->destroy(writer);
+ return success;
+}
+
+/**
+ * Derive-Secret as defined in RFC 8446, section 7.1:
+ * Derive-Secret(Secret, Label, Message) -> OKM
+ */
+static bool derive_secret(private_tls_hkdf_t *this, chunk_t label,
+ chunk_t messages)
+{
+ bool success;
+ chunk_t context;
+
+ if (!this->hasher ||
+ !this->hasher->allocate_hash(this->hasher, messages, &context))
+ {
+ DBG1(DBG_TLS, "%N not supported", hash_algorithm_names,
+ this->hash_algorithm);
+ return FALSE;
+ }
+
+ success = expand_label(this, this->prk, label, context,
+ this->hasher->get_hash_size(this->hasher),
+ &this->okm);
+ chunk_free(&context);
+ return success;
+}
+
+static bool move_to_phase_1(private_tls_hkdf_t *this)
+{
+ chunk_t salt_zero;
+
+ switch (this->phase)
+ {
+ case HKDF_PHASE_0:
+ salt_zero = chunk_alloca(this->hasher->get_hash_size(this->hasher));
+ chunk_copy_pad(salt_zero, chunk_empty, 0);
+ if (!extract(this, salt_zero, this->ikm, &this->prk))
+ {
+ DBG1(DBG_TLS, "unable to extract PRK");
+ return FALSE;
+ }
+ this->phase = HKDF_PHASE_1;
+ return TRUE;
+ case HKDF_PHASE_1:
+ return TRUE;
+ default:
+ DBG1(DBG_TLS, "invalid HKDF phase");
+ return FALSE;
+ }
+}
+
+static bool move_to_phase_2(private_tls_hkdf_t *this)
+{
+ chunk_t derived;
+
+ switch (this->phase)
+ {
+ case HKDF_PHASE_0:
+ if (!move_to_phase_1(this))
+ {
+ DBG1(DBG_TLS, "unable to move to phase 1");
+ return FALSE;
+ }
+ /* fall-through */
+ case HKDF_PHASE_1:
+ derived = chunk_from_str("tls13 derived");
+ if (!derive_secret(this, derived, chunk_empty))
+ {
+ DBG1(DBG_TLS, "unable to derive secret");
+ return FALSE;
+ }
+
+ if (!this->shared_secret.ptr)
+ {
+ DBG1(DBG_TLS, "no shared secret set");
+ return FALSE;
+ }
+ else
+ {
+ chunk_clear(&this->ikm);
+ this->ikm = chunk_clone(this->shared_secret);
+ }
+
+ if (!extract(this, this->okm, this->ikm, &this->prk))
+ {
+ DBG1(DBG_TLS, "unable extract PRK");
+ return FALSE;
+ }
+ this->phase = HKDF_PHASE_2;
+ return TRUE;
+ case HKDF_PHASE_2:
+ return TRUE;
+ default:
+ DBG1(DBG_TLS, "invalid HKDF phase");
+ return FALSE;
+ }
+}
+
+static bool move_to_phase_3(private_tls_hkdf_t *this)
+{
+ chunk_t derived, ikm_zero;
+
+ switch (this->phase)
+ {
+ case HKDF_PHASE_0:
+ case HKDF_PHASE_1:
+ if (!move_to_phase_2(this))
+ {
+ DBG1(DBG_TLS, "unable to move to phase 2");
+ return FALSE;
+ }
+ /* fall-through */
+ case HKDF_PHASE_2:
+ /* prepare okm for next extract */
+ derived = chunk_from_str("tls13 derived");
+ if (!derive_secret(this, derived, chunk_empty))
+ {
+ DBG1(DBG_TLS, "unable to derive secret");
+ return FALSE;
+ }
+
+ ikm_zero = chunk_alloca(this->hasher->get_hash_size(this->hasher));
+ chunk_copy_pad(ikm_zero, chunk_empty, 0);
+ if (!extract(this, this->okm, ikm_zero, &this->prk))
+ {
+ DBG1(DBG_TLS, "unable extract PRK");
+ return FALSE;
+ }
+ this->phase = HKDF_PHASE_3;
+ return TRUE;
+ case HKDF_PHASE_3:
+ return TRUE;
+ default:
+ DBG1(DBG_TLS, "invalid HKDF phase");
+ return FALSE;
+ }
+}
+
+static void return_secret(private_tls_hkdf_t *this, chunk_t key,
+ chunk_t *secret)
+{
+ *secret = chunk_alloc(key.len);
+ chunk_copy_pad(*secret, key, 0);
+}
+
+static bool get_shared_label_keys(private_tls_hkdf_t *this, chunk_t label,
+ bool is_server, size_t length, chunk_t *key)
+{
+ chunk_t result, secret;
+
+ if (is_server)
+ {
+ secret = chunk_clone(this->server_traffic_secret);
+ }
+ else
+ {
+ secret = chunk_clone(this->client_traffic_secret);
+ }
+
+ if (!expand_label(this, secret, label, chunk_empty, length, &result))
+ {
+ DBG1(DBG_TLS, "unable to derive secret");
+ chunk_clear(&secret);
+ chunk_clear(&result);
+ return FALSE;
+ }
+
+ if (key)
+ {
+ return_secret(this, result, key);
+ }
+
+ chunk_clear(&secret);
+ chunk_clear(&result);
+ return TRUE;
+}
+
+METHOD(tls_hkdf_t, set_shared_secret, void,
+ private_tls_hkdf_t *this, chunk_t shared_secret)
+{
+ this->shared_secret = chunk_clone(shared_secret);
+}
+
+METHOD(tls_hkdf_t, generate_secret, bool,
+ private_tls_hkdf_t *this, enum tls_hkdf_labels_t label, chunk_t messages,
+ chunk_t *secret)
+{
+ switch (label)
+ {
+ case TLS_HKDF_EXT_BINDER:
+ case TLS_HKDF_RES_BINDER:
+ case TLS_HKDF_C_E_TRAFFIC:
+ case TLS_HKDF_E_EXP_MASTER:
+ if (!move_to_phase_1(this))
+ {
+ DBG1(DBG_TLS, "unable to move to phase 1");
+ return FALSE;
+ }
+ break;
+ case TLS_HKDF_C_HS_TRAFFIC:
+ case TLS_HKDF_S_HS_TRAFFIC:
+ if (!move_to_phase_2(this))
+ {
+ DBG1(DBG_TLS, "unable to move to phase 2");
+ return FALSE;
+ }
+ break;
+ case TLS_HKDF_C_AP_TRAFFIC:
+ case TLS_HKDF_S_AP_TRAFFIC:
+ case TLS_HKDF_EXP_MASTER:
+ case TLS_HKDF_RES_MASTER:
+ if (!move_to_phase_3(this))
+ {
+ DBG1(DBG_TLS, "unable to move to phase 3");
+ return FALSE;
+ }
+ break;
+ default:
+ DBG1(DBG_TLS, "invalid HKDF label");
+ return FALSE;
+ }
+
+ if (!derive_secret(this, chunk_from_str(hkdf_labels[label]), messages))
+ {
+ DBG1(DBG_TLS, "unable to derive secret");
+ return FALSE;
+ }
+
+ if (label == TLS_HKDF_C_HS_TRAFFIC || label == TLS_HKDF_C_AP_TRAFFIC)
+ {
+ chunk_clear(&this->client_traffic_secret);
+ this->client_traffic_secret = chunk_clone(this->okm);
+ }
+
+ if (label == TLS_HKDF_S_HS_TRAFFIC || label == TLS_HKDF_S_AP_TRAFFIC)
+ {
+ chunk_clear(&this->server_traffic_secret);
+ this->server_traffic_secret = chunk_clone(this->okm);
+ }
+
+ if (secret)
+ {
+ return_secret(this, this->okm, secret);
+ }
+
+ return TRUE;
+}
+
+METHOD(tls_hkdf_t, derive_key, bool,
+ private_tls_hkdf_t *this, bool is_server, size_t length, chunk_t *key)
+{
+ return get_shared_label_keys(this, chunk_from_str("tls13 key"), is_server,
+ length, key);
+}
+
+METHOD(tls_hkdf_t, derive_iv, bool,
+ private_tls_hkdf_t *this, bool is_server, size_t length, chunk_t *iv)
+{
+ return get_shared_label_keys(this, chunk_from_str("tls13 iv"), is_server,
+ length, iv);
+}
+
+METHOD(tls_hkdf_t, derive_finished, bool,
+ private_tls_hkdf_t *this, bool is_server, chunk_t *finished)
+{
+ return get_shared_label_keys(this, chunk_from_str("tls13 finished"),
+ is_server,
+ this->hasher->get_hash_size(this->hasher),
+ finished);
+}
+
+METHOD(tls_hkdf_t, destroy, void,
+ private_tls_hkdf_t *this)
+{
+ chunk_free(&this->ikm);
+ chunk_clear(&this->prk);
+ chunk_clear(&this->shared_secret);
+ chunk_clear(&this->okm);
+ chunk_clear(&this->client_traffic_secret);
+ chunk_clear(&this->server_traffic_secret);
+ DESTROY_IF(this->prf);
+ DESTROY_IF(this->hasher);
+ free(this);
+}
+
+tls_hkdf_t *tls_hkdf_create(hash_algorithm_t hash_algorithm, chunk_t psk)
+{
+ private_tls_hkdf_t *this;
+ pseudo_random_function_t prf_algorithm;
+
+ switch (hash_algorithm)
+ {
+ case HASH_SHA256:
+ prf_algorithm = PRF_HMAC_SHA2_256;
+ break;
+ case HASH_SHA384:
+ prf_algorithm = PRF_HMAC_SHA2_384;
+ break;
+ default:
+ DBG1(DBG_TLS, "not supported hash algorithm");
+ return NULL;
+ }
+
+ INIT(this,
+ .public = {
+ .set_shared_secret = _set_shared_secret,
+ .generate_secret = _generate_secret,
+ .derive_key = _derive_key,
+ .derive_iv = _derive_iv,
+ .derive_finished = _derive_finished,
+ .destroy = _destroy,
+ },
+ .phase = HKDF_PHASE_0,
+ .hash_algorithm = hash_algorithm,
+ .prf = lib->crypto->create_prf(lib->crypto, prf_algorithm),
+ .hasher = lib->crypto->create_hasher(lib->crypto, hash_algorithm),
+ );
+
+ if (!psk.ptr)
+ {
+ this->ikm = chunk_alloc(this->hasher->get_hash_size(this->hasher));
+ chunk_copy_pad(this->ikm, chunk_empty, 0);
+ }
+ else
+ {
+ this->ikm = chunk_clone(psk);
+ }
+
+ if (!this->prf || !this->hasher)
+ {
+ DBG1(DBG_TLS, "unable to initialise HKDF");
+ destroy(this);
+ return NULL;
+ }
+
+ return &this->public;
+}
projects / thirdparty / strongswan.git / commitdiff
