Introduce platform-layer functions for reading/writing seed from NV
Introduces mbedtls_nv_seed_read() and mbedtls_nv_seed_write().
The platform-layer functions are only available when
MBEDTLS_ENTROPY_NV_SEED is enabled.
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index 407cd57..63f93ec 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -3,7 +3,7 @@
*
* \brief Consistency checks for configuration options
*
- * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -368,6 +368,38 @@
#error "MBEDTLS_PLATFORM_STD_SNPRINTF defined, but not all prerequisites"
#endif
+#if defined(MBEDTLS_ENTROPY_NV_SEED) &&\
+ ( !defined(MBEDTLS_PLATFORM_C) || !defined(MBEDTLS_ENTROPY_C) )
+#error "MBEDTLS_ENTROPY_NV_SEED defined, but not all prerequisites"
+#endif
+
+#if defined(MBEDTLS_PLATFORM_NV_SEED_ALT) &&\
+ !defined(MBEDTLS_ENTROPY_NV_SEED)
+#error "MBEDTLS_PLATFORM_NV_SEED_ALT defined, but not all prerequisites"
+#endif
+
+#if defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ) &&\
+ !defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
+#error "MBEDTLS_PLATFORM_STD_NV_SEED_READ defined, but not all prerequisites"
+#endif
+
+#if defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE) &&\
+ !defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
+#error "MBEDTLS_PLATFORM_STD_NV_SEED_WRITE defined, but not all prerequisites"
+#endif
+
+#if defined(MBEDTLS_PLATFORM_NV_SEED_READ_MACRO) &&\
+ ( defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ) ||\
+ defined(MBEDTLS_PLATFORM_NV_SEED_ALT) )
+#error "MBEDTLS_PLATFORM_NV_SEED_READ_MACRO and MBEDTLS_PLATFORM_STD_NV_SEED_READ cannot be defined simultaneously"
+#endif
+
+#if defined(MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO) &&\
+ ( defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE) ||\
+ defined(MBEDTLS_PLATFORM_NV_SEED_ALT) )
+#error "MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO and MBEDTLS_PLATFORM_STD_NV_SEED_WRITE cannot be defined simultaneously"
+#endif
+
#if defined(MBEDTLS_RSA_C) && ( !defined(MBEDTLS_BIGNUM_C) || \
!defined(MBEDTLS_OID_C) )
#error "MBEDTLS_RSA_C defined, but not all prerequisites"
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index f800f13..3e12f43 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -156,6 +156,7 @@
//#define MBEDTLS_PLATFORM_FPRINTF_ALT
//#define MBEDTLS_PLATFORM_PRINTF_ALT
//#define MBEDTLS_PLATFORM_SNPRINTF_ALT
+//#define MBEDTLS_PLATFORM_NV_SEED_ALT
/**
* \def MBEDTLS_DEPRECATED_WARNING
@@ -825,6 +826,25 @@
//#define MBEDTLS_ENTROPY_FORCE_SHA256
/**
+ * \def MBEDTLS_ENTROPY_NV_SEED
+ *
+ * Enable the non-volatile (NV) seed file-based entropy source.
+ * (Also enables the NV seed read/write functions in the platform layer)
+ *
+ * This is crucial (if not required) on systems that do not have a
+ * cryptographic entropy source (in hardware or kernel) available.
+ *
+ * Requires: MBEDTLS_ENTROPY_C, MBEDTLS_PLATFORM_C
+ *
+ * Note: If you use the default implementation functions that read a seedfile
+ * with regular fopen(), please make sure you make a seedfile with the
+ * proper name (defined in MBEDTLS_PLATFORM_STD_NV_SEED_FILE) and at
+ * least MBEDTLS_ENTROPY_BLOCK_SIZE bytes in size that can be read from
+ * and written to or you will get an entropy source error!
+ */
+//#define MBEDTLS_ENTROPY_NV_SEED
+
+/**
* \def MBEDTLS_MEMORY_DEBUG
*
* Enable debugging of buffer allocator memory issues. Automatically prints
@@ -2498,6 +2518,9 @@
//#define MBEDTLS_PLATFORM_STD_SNPRINTF snprintf /**< Default snprintf to use, can be undefined */
//#define MBEDTLS_PLATFORM_STD_EXIT_SUCCESS 0 /**< Default exit value to use, can be undefined */
//#define MBEDTLS_PLATFORM_STD_EXIT_FAILURE 1 /**< Default exit value to use, can be undefined */
+//#define MBEDTLS_PLATFORM_STD_NV_SEED_READ mbedtls_platform_std_nv_seed_read /**< Default nv_seed_read function to use, can be undefined */
+//#define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE mbedtls_platform_std_nv_seed_write /**< Default nv_seed_write function to use, can be undefined */
+//#define MBEDTLS_PLATFORM_STD_NV_SEED_FILE "seedfile" /**< Seed file to read/write with default implementation */
/* To Use Function Macros MBEDTLS_PLATFORM_C must be enabled */
/* MBEDTLS_PLATFORM_XXX_MACRO and MBEDTLS_PLATFORM_XXX_ALT cannot both be defined */
@@ -2510,6 +2533,8 @@
//#define MBEDTLS_PLATFORM_PRINTF_MACRO printf /**< Default printf macro to use, can be undefined */
/* Note: your snprintf must correclty zero-terminate the buffer! */
//#define MBEDTLS_PLATFORM_SNPRINTF_MACRO snprintf /**< Default snprintf macro to use, can be undefined */
+//#define MBEDTLS_PLATFORM_NV_SEED_READ_MACRO mbedtls_platform_std_nv_seed_read /**< Default nv_seed_read function to use, can be undefined */
+//#define MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO mbedtls_platform_std_nv_seed_write /**< Default nv_seed_write function to use, can be undefined */
/* SSL Cache options */
//#define MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT 86400 /**< 1 day */
diff --git a/include/mbedtls/platform.h b/include/mbedtls/platform.h
index 039cb58..10137d7 100644
--- a/include/mbedtls/platform.h
+++ b/include/mbedtls/platform.h
@@ -3,7 +3,7 @@
*
* \brief mbed TLS Platform abstraction layer
*
- * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -76,12 +76,22 @@
#if !defined(MBEDTLS_PLATFORM_STD_EXIT_FAILURE)
#define MBEDTLS_PLATFORM_STD_EXIT_FAILURE EXIT_FAILURE /**< Default exit value to use */
#endif
+#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
+#define MBEDTLS_PLATFORM_STD_NV_SEED_READ mbedtls_platform_std_nv_seed_read
+#endif
+#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
+#define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE mbedtls_platform_std_nv_seed_write
+#endif
+#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_FILE)
+#define MBEDTLS_PLATFORM_STD_NV_SEED_FILE "seedfile"
+#endif
#else /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
#if defined(MBEDTLS_PLATFORM_STD_MEM_HDR)
#include MBEDTLS_PLATFORM_STD_MEM_HDR
#endif
#endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
+
/* \} name SECTION: Module settings */
/*
@@ -262,6 +272,47 @@
#endif /* MBEDTLS_PLATFORM_TIME_MACRO */
#endif /* MBEDTLS_PLATFORM_TIME_ALT */
+/*
+ * The function pointers for reading from and writing a seed file to
+ * Non-Volatile storage (NV) in a platform-independent way
+ *
+ * Only enabled when the NV seed entropy source is enabled
+ */
+#if defined(MBEDTLS_ENTROPY_NV_SEED)
+#if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
+/* Internal standard platform definitions */
+int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len );
+int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len );
+#endif
+
+#if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
+extern int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len );
+extern int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len );
+
+/**
+ * \brief Set your own seed file writing/reading functions
+ *
+ * \param nv_seed_read_func the seed reading function implementation
+ * \param nv_seed_write_func the seed writing function implementation
+ *
+ * \return 0
+ */
+int mbedtls_platform_set_nv_seed(
+ int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ),
+ int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len )
+ );
+#else
+#if defined(MBEDTLS_PLATFORM_NV_SEED_READ_MACRO) && \
+ defined(MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO)
+#define mbedtls_nv_seed_read MBEDTLS_PLATFORM_NV_SEED_READ_MACRO
+#define mbedtls_nv_seed_write MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO
+#else
+#define mbedtls_nv_seed_read mbedtls_platform_std_nv_seed_read
+#define mbedtls_nv_seed_write mbedtls_platform_std_nv_seed_write
+#endif
+#endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
+#endif /* MBEDTLS_ENTROPY_NV_SEED */
+
#ifdef __cplusplus
}
#endif