Latest update.

crypto/rand/rand_vxworks.c

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+/*
+ * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <openssl/opensslconf.h>
+
+#ifndef OPENSSL_SYS_VXWORKS
+NON_EMPTY_TRANSLATION_UNIT
+#else
+# include <openssl/rand.h>
+# include "rand_lcl.h"
+# include "internal/rand_int.h"
+# include "internal/cryptlib.h"
+# include <version.h>
+# include <taskLib.h>
+
+# if defined(OPENSSL_RAND_SEED_NONE)
+/* none means none */
+#  undef OPENSSL_RAND_SEED_OS
+# endif
+
+# if defined(OPENSSL_RAND_SEED_OS)
+#  if _WRS_VXWORKS_MAJOR >= 7
+#    define RAND_SEED_VXRANDLIB
+#  else
+#    error "VxWorks <7 only support RAND_SEED_NONE"
+#  endif
+# endif
+
+# if defined(RAND_SEED_VXRANDLIB)
+#  include <randomNumGen.h>
+# endif
+
+/* Macro to convert two thirty two bit values into a sixty four bit one */
+# define TWO32TO64(a, b) ((((uint64_t)(a)) << 32) + (b))
+
+static uint64_t get_time_stamp(void)
+{
+    struct timespec ts;
+
+    if (clock_gettime(CLOCK_REALTIME, &ts) == 0)
+        return TWO32TO64(ts.tv_sec, ts.tv_nsec);
+    return time(NULL);
+}
+
+static uint64_t get_timer_bits(void)
+{
+    uint64_t res = OPENSSL_rdtsc();
+    struct timespec ts;
+
+    if (res != 0)
+        return res;
+
+    if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0)
+        return TWO32TO64(ts.tv_sec, ts.tv_nsec);
+    return time(NULL);
+}
+
+/*
+ * empty implementation
+ * vxworks does not need to init/cleanup or keep open the random lib
+ */
+int rand_pool_init(void)
+{
+    return 1;
+}
+
+void rand_pool_cleanup(void)
+{
+}
+
+void rand_pool_keep_random_devices_open(int keep)
+{
+}
+
+int rand_pool_add_additional_data(RAND_POOL *pool)
+{
+    struct {
+        CRYPTO_THREAD_ID tid;
+        uint64_t time;
+    } data;
+
+    memset(&data, 0, sizeof(data));
+
+    /*
+     * Add some noise from the thread id and a high resolution timer.
+     * The thread id adds a little randomness if the drbg is accessed
+     * concurrently (which is the case for the <master> drbg).
+     */
+    data.tid = CRYPTO_THREAD_get_current_id();
+    data.time = get_timer_bits();
+
+    return rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
+}
+
+int rand_pool_add_nonce_data(RAND_POOL *pool)
+{
+    struct {
+        pid_t pid;
+        CRYPTO_THREAD_ID tid;
+        uint64_t time;
+    } data;
+
+    memset(&data, 0, sizeof(data));
+
+    /*
+     * Add process id, thread id, and a high resolution timestamp to
+     * ensure that the nonce is unique with high probability for
+     * different process instances.
+     */
+    data.pid = getpid();
+    data.tid = CRYPTO_THREAD_get_current_id();
+    data.time = get_time_stamp();
+
+    return rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
+}
+
+size_t rand_pool_acquire_entropy(RAND_POOL *pool)
+{
+# if defined(RAND_SEED_VXRANDLIB)
+    /* vxRandLib based entropy method */
+    size_t bytes_needed;
+
+    bytes_needed = rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
+    if (bytes_needed > 0)
+    {
+        int retryCount = 0;
+        STATUS result = ERROR;
+        unsigned char *buffer;
+
+        buffer = rand_pool_add_begin(pool, bytes_needed);
+        while ((result != OK) && (retryCount < 10)) {
+            RANDOM_NUM_GEN_STATUS status = randStatus();
+
+            if ((status == RANDOM_NUM_GEN_ENOUGH_ENTROPY)
+                    || (status == RANDOM_NUM_GEN_MAX_ENTROPY) ) {
+                result = randBytes(buffer, bytes_needed);
+                if (result == OK)
+                    rand_pool_add_end(pool, bytes_needed, 8 * bytes_needed);
+                /*
+                 * no else here: randStatus said ok, if randBytes failed
+                 * it will result in another loop or no entropy
+                 */
+            } else {
+                /*
+                 * give a minimum delay here to allow OS to collect more
+                 * entropy. taskDelay duration will depend on the system tick,
+                 * this is by design as the sw-random lib uses interrupts
+                 * which will at least happen during ticks
+                 */
+                taskDelay(5);
+            }
+            retryCount++;
+        }
+    }
+    return rand_pool_entropy_available(pool);
+# else
+    /*
+     * SEED_NONE means none, without randlib we dont have entropy and
+     * rely on it being added externally
+     */
+    return rand_pool_entropy_available(pool);
+# endif /* defined(RAND_SEED_VXRANDLIB) */
+}
+
+#endif /* OPENSSL_SYS_VXWORKS */