rp2/mbedtls: Add support for ssl module with MICROPY_SSL_MBEDTLS.

Signed-off-by: Andrew Leech <andrew@alelec.net>

ports/rp2/CMakeLists.txt

@@ -66,6 +66,7 @@ set(MICROPY_SOURCE_LIB
     ${MICROPY_DIR}/lib/littlefs/lfs1_util.c
     ${MICROPY_DIR}/lib/littlefs/lfs2.c
     ${MICROPY_DIR}/lib/littlefs/lfs2_util.c
+    ${MICROPY_DIR}/lib/mbedtls_errors/mp_mbedtls_errors.c
     ${MICROPY_DIR}/lib/oofatfs/ff.c
     ${MICROPY_DIR}/lib/oofatfs/ffunicode.c
     ${MICROPY_DIR}/shared/netutils/netutils.c
@@ -108,6 +109,7 @@ set(MICROPY_SOURCE_PORT
     tusb_port.c
     uart.c
     msc_disk.c
+    mbedtls/mbedtls_port.c
 )
 
 set(MICROPY_SOURCE_QSTR
@@ -238,6 +240,13 @@ target_sources(${MICROPY_TARGET} PRIVATE
 )
 
 target_link_libraries(${MICROPY_TARGET} micropy_lib_mbedtls)
+
+# Filter out library/error.c as we're using mp_mbedtls_errors.c instead.
+set_source_files_properties(${MICROPY_LIB_MBEDTLS_DIR}/library/error.c
+    TARGET_DIRECTORY micropy_lib_mbedtls
+    PROPERTIES HEADER_FILE_ONLY ON
+)
+
 target_link_libraries(${MICROPY_TARGET} usermod)
 
 target_include_directories(${MICROPY_TARGET} PRIVATE

ports/rp2/mbedtls/mbedtls_config.h

@@ -0,0 +1,99 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018-2019 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_MBEDTLS_CONFIG_H
+#define MICROPY_INCLUDED_MBEDTLS_CONFIG_H
+
+// Set mbedtls configuration
+#define MBEDTLS_PLATFORM_MEMORY
+#define MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
+#define MBEDTLS_DEPRECATED_REMOVED
+#define MBEDTLS_ENTROPY_HARDWARE_ALT
+#define MBEDTLS_AES_ROM_TABLES
+#define MBEDTLS_CIPHER_MODE_CBC
+#define MBEDTLS_ECP_DP_SECP192R1_ENABLED
+#define MBEDTLS_ECP_DP_SECP224R1_ENABLED
+#define MBEDTLS_ECP_DP_SECP256R1_ENABLED
+#define MBEDTLS_ECP_DP_SECP384R1_ENABLED
+#define MBEDTLS_ECP_DP_SECP521R1_ENABLED
+#define MBEDTLS_ECP_DP_SECP192K1_ENABLED
+#define MBEDTLS_ECP_DP_SECP224K1_ENABLED
+#define MBEDTLS_ECP_DP_SECP256K1_ENABLED
+#define MBEDTLS_ECP_DP_BP256R1_ENABLED
+#define MBEDTLS_ECP_DP_BP384R1_ENABLED
+#define MBEDTLS_ECP_DP_BP512R1_ENABLED
+#define MBEDTLS_ECP_DP_CURVE25519_ENABLED
+#define MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
+#define MBEDTLS_NO_PLATFORM_ENTROPY
+#define MBEDTLS_PKCS1_V15
+#define MBEDTLS_SHA256_SMALLER
+#define MBEDTLS_SSL_PROTO_TLS1
+#define MBEDTLS_SSL_PROTO_TLS1_1
+#define MBEDTLS_SSL_PROTO_TLS1_2
+#define MBEDTLS_SSL_SERVER_NAME_INDICATION
+
+// Use a smaller output buffer to reduce size of SSL context
+#define MBEDTLS_SSL_MAX_CONTENT_LEN (16384)
+#define MBEDTLS_SSL_IN_CONTENT_LEN  (MBEDTLS_SSL_MAX_CONTENT_LEN)
+#define MBEDTLS_SSL_OUT_CONTENT_LEN (4096)
+
+// Enable mbedtls modules
+#define MBEDTLS_AES_C
+#define MBEDTLS_ASN1_PARSE_C
+#define MBEDTLS_BIGNUM_C
+#define MBEDTLS_CIPHER_C
+#define MBEDTLS_CTR_DRBG_C
+// #define MBEDTLS_ECP_C
+#define MBEDTLS_ENTROPY_C
+#define MBEDTLS_ERROR_C
+#define MBEDTLS_MD_C
+#define MBEDTLS_MD5_C
+#define MBEDTLS_OID_C
+#define MBEDTLS_PKCS5_C
+#define MBEDTLS_PK_C
+#define MBEDTLS_PK_PARSE_C
+#define MBEDTLS_PLATFORM_C
+#define MBEDTLS_RSA_C
+#define MBEDTLS_SHA1_C
+#define MBEDTLS_SHA256_C
+#define MBEDTLS_SHA512_C
+#define MBEDTLS_SSL_CLI_C
+#define MBEDTLS_SSL_SRV_C
+#define MBEDTLS_SSL_TLS_C
+#define MBEDTLS_X509_CRT_PARSE_C
+#define MBEDTLS_X509_USE_C
+
+// Memory allocation hooks
+#include <stdlib.h>
+#include <stdio.h>
+void *m_tracked_calloc(size_t nmemb, size_t size);
+void m_tracked_free(void *ptr);
+#define MBEDTLS_PLATFORM_STD_CALLOC m_tracked_calloc
+#define MBEDTLS_PLATFORM_STD_FREE m_tracked_free
+#define MBEDTLS_PLATFORM_SNPRINTF_MACRO snprintf
+
+#include "mbedtls/check_config.h"
+
+#endif /* MICROPY_INCLUDED_MBEDTLS_CONFIG_H */

ports/rp2/mbedtls/mbedtls_port.c

@@ -0,0 +1,42 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include <py/mpconfig.h>
+
+#ifdef MICROPY_SSL_MBEDTLS
+
+#include "mbedtls_config.h"
+
+extern uint8_t rosc_random_u8(size_t cycles);
+
+int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen) {
+    *olen = len;
+    for (size_t i = 0; i < len; i++) {
+        output[i] = rosc_random_u8(8);
+    }
+    return 0;
+}
+
+#endif

ports/rp2/mpconfigport.h

@@ -60,6 +60,7 @@
 #define MICROPY_OPT_COMPUTED_GOTO               (1)
 
 // Python internal features
+#define MICROPY_TRACKED_ALLOC                   (MICROPY_SSL_MBEDTLS)
 #define MICROPY_READER_VFS                      (1)
 #define MICROPY_ENABLE_GC                       (1)
 #define MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF  (1)