mbedtls: add mbedtls into the build system
Port mbedtls with adapted libc header files.
Add mbedtls default config header file.
Optimize mbedtls default config by disabling unused features to
reduce the target size.
Add mbedtls kbuild makefile.
Add Kconfig skeleton and config submenu entry for selecting
crypto libraries between mbedtls and legacy ones.
Add the mbedtls include directories into the build system.
Port u-boot hash functions as MbedTLS crypto alternatives and set
it as default.
Subsequent patches will separate those Kconfigs into pairs of
_LEGACY and _MBEDTLS for controlling the implementations of legacy
crypto libraries and MbedTLS ones respectively.
The motivation of moving and adapting *INT* macros from kernel.h
to limits.h is to fulfill the MbedTLS building requirement.
The conditional compilation statements in MbedTLS expects the
*INT* macros as constant expressions, thus expressions like
`((int)(~0U >> 1))` will not work.
Prerequisite
------------
This patch series requires mbedtls git repo to be added as a
subtree to the main U-Boot repo via:
$ git subtree add --prefix lib/mbedtls/external/mbedtls \
https://github.com/Mbed-TLS/mbedtls.git \
v3.6.0 --squash
Moreover, due to the Windows-style files from mbedtls git repo,
we need to convert the CRLF endings to LF and do a commit manually:
$ git add --renormalize .
$ git commit
Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
diff --git a/lib/mbedtls/mbedtls_def_config.h b/lib/mbedtls/mbedtls_def_config.h
new file mode 100644
index 0000000..6fba053
--- /dev/null
+++ b/lib/mbedtls/mbedtls_def_config.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * MbedTLS config file
+ *
+ * Derived from the MbedTLS internal config file,
+ * for more information about each build option,
+ * please refer to:
+ * external/mbedtls/include/mbedtls/mbedtls_config.h
+ *
+ * Copyright (c) 2024 Linaro Limited
+ * Author: Raymond Mao <raymond.mao@linaro.org>
+ */
+
+#if defined CONFIG_MBEDTLS_LIB
+
+#if CONFIG_IS_ENABLED(MD5)
+#define MBEDTLS_MD_C
+#define MBEDTLS_MD5_C
+#if defined CONFIG_MBEDTLS_LIB_CRYPTO_ALT
+#define MBEDTLS_MD5_ALT
+#endif
+#endif
+
+#if CONFIG_IS_ENABLED(SHA1)
+#define MBEDTLS_MD_C
+#define MBEDTLS_SHA1_C
+#if defined CONFIG_MBEDTLS_LIB_CRYPTO_ALT
+#define MBEDTLS_SHA1_ALT
+#endif
+#endif
+
+#if CONFIG_IS_ENABLED(SHA256)
+#define MBEDTLS_MD_C
+#define MBEDTLS_SHA256_C
+#if defined CONFIG_MBEDTLS_LIB_CRYPTO_ALT
+#define MBEDTLS_SHA256_ALT
+#endif
+#endif
+
+#if CONFIG_IS_ENABLED(SHA384)
+#define MBEDTLS_MD_C
+#define MBEDTLS_SHA384_C
+#endif
+
+#if CONFIG_IS_ENABLED(SHA512)
+#define MBEDTLS_MD_C
+#define MBEDTLS_SHA512_C
+#if defined CONFIG_MBEDTLS_LIB_CRYPTO_ALT
+#define MBEDTLS_SHA512_ALT
+#endif
+#endif
+
+#if defined CONFIG_MBEDTLS_LIB_X509
+
+#if CONFIG_IS_ENABLED(X509_CERTIFICATE_PARSER)
+#define MBEDTLS_X509_USE_C
+#define MBEDTLS_X509_CRT_PARSE_C
+#define MBEDTLS_X509_CRL_PARSE_C
+#endif
+
+#if CONFIG_IS_ENABLED(ASYMMETRIC_PUBLIC_KEY_SUBTYPE)
+#define MBEDTLS_PK_C
+#define MBEDTLS_PK_PARSE_C
+#endif
+
+#if CONFIG_IS_ENABLED(RSA_PUBLIC_KEY_PARSER)
+#define MBEDTLS_BIGNUM_C
+#define MBEDTLS_RSA_C
+#define MBEDTLS_PKCS1_V15
+#endif
+
+#if CONFIG_IS_ENABLED(PKCS7_MESSAGE_PARSER)
+#define MBEDTLS_PKCS7_C
+#endif
+
+#if CONFIG_IS_ENABLED(ASN1_DECODER)
+#define MBEDTLS_OID_C
+#define MBEDTLS_ASN1_PARSE_C
+#define MBEDTLS_ASN1_WRITE_C
+#endif
+
+#endif /* #if defined CONFIG_MBEDTLS_LIB_X509 */
+
+#endif /* #if defined CONFIG_MBEDTLS_LIB */