[crypto] Add ECDSA-based TLS cipher suites

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/crypto/mishmash/ecdhe_ecdsa_aes_cbc_sha256.c

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2025 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <byteswap.h>
+#include <ipxe/ecdsa.h>
+#include <ipxe/aes.h>
+#include <ipxe/sha256.h>
+#include <ipxe/tls.h>
+
+/** TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 cipher suite */
+struct tls_cipher_suite
+tls_ecdhe_ecdsa_with_aes_128_cbc_sha256 __tls_cipher_suite ( 03 ) = {
+	.code = htons ( TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 ),
+	.key_len = ( 128 / 8 ),
+	.fixed_iv_len = 0,
+	.record_iv_len = AES_BLOCKSIZE,
+	.mac_len = SHA256_DIGEST_SIZE,
+	.exchange = &tls_ecdhe_exchange_algorithm,
+	.pubkey = &ecdsa_algorithm,
+	.cipher = &aes_cbc_algorithm,
+	.digest = &sha256_algorithm,
+	.handshake = &sha256_algorithm,
+};