Template for wolfSSH minimal build using user_settings.h

examples/configs/README.md

@@ -15,6 +15,7 @@ Example wolfSSL configuration file templates for use when autoconf is not availa
 * `user_settings_stm32.h`: Example configuration file generated from the wolfSSL STM32 Cube pack.
 * `user_settings_tls12`: Example for TLS v1.2 client only, ECC only, AES GCM only, SHA2-256 only.
 * `user_settings_wolfboot_keytools.h`: This from wolfBoot tools/keytools and is ECC, RSA, ED25519 and ChaCha20.
+* `user_settings_wolfssh.h`: Minimum options for building wolfSSH. See comment at top for ./configure used to generate.
 * `user_settings_wolftpm.h`: Minimum options for building wolfTPM. See comment at top for ./configure used to generate.
 
 ## Usage

examples/configs/include.am

@@ -13,4 +13,5 @@ EXTRA_DIST += examples/configs/user_settings_stm32.h
 EXTRA_DIST += examples/configs/user_settings_template.h
 EXTRA_DIST += examples/configs/user_settings_tls12.h
 EXTRA_DIST += examples/configs/user_settings_wolfboot_keytools.h
+EXTRA_DIST += examples/configs/user_settings_wolfssh.h
 EXTRA_DIST += examples/configs/user_settings_wolftpm.h

examples/configs/user_settings_wolfssh.h

@@ -0,0 +1,214 @@
+/* user_settings_wolfssh.h
+ *
+ * Copyright (C) 2006-2024 wolfSSL Inc.
+ *
+ * This file is part of wolfSSL.
+ *
+ * wolfSSL 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.
+ *
+ * wolfSSL 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 02110-1335, USA
+ */
+
+
+/* To use the rename file to user_settings.h and define WOLFSSL_USER_SETTINGS */
+
+/* Started from the following configure and hand tuned, organized and commented:
+./configure --enable-wolfssh --enable-sp=small --enable-sp-math \
+--disable-sp-asm --disable-asm --disable-sys-ca-certs --enable-aesgcm=small \
+--enable-cryptonly --disable-sha3 --disable-chacha --disable-poly1305 \
+--disable-md5 --disable-error-queue-per-thread --disable-pkcs12 \
+--disable-errorstrings --disable-sni --disable-sha224
+make
+*/
+
+/* Tested using:
+cp ./examples/configs/user_settings_wolfssh.h user_settings.h
+cp ./examples/configs/user_settings_wolfssh.h ../wolfSSH/user_settings.h
+
+wolfSSL:
+./configure --enable-usersettings --disable-examples CFLAGS="-Os"
+make
+sudo make install
+
+wolfSSH:
+./configure --enable-scp --disable-shared --disable-term \
+    CFLAGS="-DWOLFSSL_USER_SETTINGS -Os"
+make
+*/
+
+#ifndef WOLFSSL_USER_SETTINGS_SSH_H
+#define WOLFSSL_USER_SETTINGS_SSH_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* #define USE_LOW_RESOURCE */
+
+/* Platform */
+#ifdef USE_LOW_RESOURCE
+    /* Threading and filesystem required for wolfSSH tests \
+     * Can be set for wolfSSH library only use */
+    #define SINGLE_THREADED
+    #define NO_FILESYSTEM
+    #define BENCH_EMBEDDED
+#endif
+
+/* Features */
+#define WOLFSSL_WOLFSSH
+#if 1
+    #define WOLFCRYPT_ONLY /* no TLS */
+#endif
+#define HAVE_HASHDRBG
+#define WOLFSSL_ASN_TEMPLATE
+#define WOLFSSL_PUBLIC_MP
+#ifndef USE_LOW_RESOURCE
+    #define WOLFSSL_BASE64_ENCODE
+#endif
+
+#ifndef WOLFCRYPT_ONLY
+    #define HAVE_TLS_EXTENSIONS
+    #define HAVE_SUPPORTED_CURVES
+    #define HAVE_ENCRYPT_THEN_MAC
+#endif
+
+/* Timing Resistance */
+#define TFM_TIMING_RESISTANT
+#define ECC_TIMING_RESISTANT
+#define WC_RSA_BLINDING
+
+/* Asymmetric */
+#if 1 /* RSA - PKCS1v1.5 */
+    #undef NO_RSA
+    #define WC_NO_RSA_OAEP /* SSH does not use OAEP */
+
+    #ifdef USE_LOW_RESOURCE
+        #define RSA_LOW_MEM
+    #endif
+#else
+    #define NO_RSA
+#endif
+
+#if 1 /* DH */
+    /* RFC 4253 requires "DH w/SHA-1"
+     * RFC 9142 requires "diffie-hellman-group14-sha256"
+     */
+    #undef NO_DH
+    #ifndef WOLFCRYPT_ONLY
+        #define HAVE_DH_DEFAULT_PARAMS
+        #define HAVE_FFDHE_2048
+    #endif
+#else
+    #define NO_DH
+#endif
+#if 1 /* ECC */
+    #define HAVE_ECC
+    #ifndef USE_LOW_RESOURCE /* optional ECC SHAMIR speedup */
+        #define ECC_SHAMIR
+    #endif
+    #define ECC_USER_CURVES
+    #ifndef USE_LOW_RESOURCE
+        #define HAVE_ECC384
+        #define HAVE_ECC521
+    #endif
+#endif
+
+/* Symmetric AES CBC/GCM */
+#undef NO_AES_CBC
+#if 1 /* GCM */
+    #define HAVE_AESGCM
+    #define GCM_SMALL
+#endif
+#ifdef USE_LOW_RESOURCE
+    #define WOLFSSL_AES_SMALL_TABLES
+#endif
+
+/* Hashing SHA-1/SHA2-256 */
+#undef NO_SHA
+#undef NO_SHA256
+#ifdef USE_LOW_RESOURCE
+    #define USE_SLOW_SHA
+    #define USE_SLOW_SHA256
+#endif
+#if 0
+    #define WOLFSSL_SHA384
+    #define WOLFSSL_SHA512
+    #ifdef USE_LOW_RESOURCE
+        #define USE_SLOW_SHA512
+    #endif
+#endif
+
+
+/* Math */
+/* Multi Precision (MP): Enable support for uncommon key sizes / curves */
+#if 0
+    #define WOLFSSL_SP_MATH_ALL
+#endif
+
+/* Single Precision (SP) Math */
+#define WOLFSSL_SP_MATH
+#define WOLFSSL_SP_SMALL
+
+#if !defined(NO_RSA) || !defined(NO_DH)
+    #undef WOLFSSL_SP_NO_2048 /* 2048-bit */
+    #ifdef USE_LOW_RESOURCE
+        #define WOLFSSL_SP_NO_3072 /* 3072-bit */
+    #else
+        #undef WOLFSSL_SP_NO_3072 /* 3072-bit */
+        #define WOLFSSL_SP_4096   /* 4096-bit */
+    #endif
+
+    #ifndef NO_RSA
+        #define WOLFSSL_HAVE_SP_RSA
+    #endif
+    #ifndef NO_DH
+        #define WOLFSSL_HAVE_SP_DH
+    #endif
+#endif
+#ifdef HAVE_ECC
+    #define WOLFSSL_HAVE_SP_ECC
+
+    #undef WOLFSSL_SP_NO_256 /* 256-bit */
+    #ifdef HAVE_ECC384
+        #define WOLFSSL_SP_384 /* 384-bit */
+    #endif
+    #ifdef HAVE_ECC521
+        #define WOLFSSL_SP_521 /* 521-bit */
+    #endif
+#endif
+
+/* Disable Algorithms */
+#define NO_DSA
+#define NO_DES3
+#define NO_MD4
+#define NO_MD5
+#define NO_RC4
+#define NO_PSK
+#define NO_PKCS12
+#define NO_PWDBASED
+#define WOLFSSL_NO_SHAKE128
+#define WOLFSSL_NO_SHAKE256
+
+/* Disable Features */
+#define NO_ERROR_STRINGS
+#define WC_NO_ASYNC_THREADING
+#define NO_DES3_TLS_SUITES
+#define NO_OLD_TLS
+#define WOLFSSL_NO_TLS12
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* WOLFSSL_USER_SETTINGS_SSH_H */