rand: remove the ossl_rand_pool_add_additional_data() function.

This function isn't called from anywhere and cannot easily be used
by the current RNG infrastructure.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from #19493)

(cherry picked from commit da7db83)

providers/implementations/include/prov/seeding.h

@@ -14,17 +14,6 @@
 size_t ossl_prov_acquire_entropy_from_tsc(RAND_POOL *pool);
 size_t ossl_prov_acquire_entropy_from_cpu(RAND_POOL *pool);
 
-/*
- * Add some platform specific additional data
- *
- * This function is platform specific and adds some random noise to the
- * additional data used for generating random bytes and for reseeding
- * the drbg.
- *
- * Returns 1 on success and 0 on failure.
- */
-int ossl_rand_pool_add_additional_data(RAND_POOL *pool);
-
 /*
  * External seeding functions from the core dispatch table.
  */

providers/implementations/rands/seeding/rand_unix.c

@@ -50,7 +50,6 @@
 # include <sys/time.h>
 
 static uint64_t get_time_stamp(void);
-static uint64_t get_timer_bits(void);
 
 /* Macro to convert two thirty two bit values into a sixty four bit one */
 # define TWO32TO64(a, b) ((((uint64_t)(a)) << 32) + (b))
@@ -774,31 +773,6 @@ int ossl_pool_add_nonce_data(RAND_POOL *pool)
     return ossl_rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
 }
 
-int ossl_rand_pool_add_additional_data(RAND_POOL *pool)
-{
-    struct {
-        int fork_id;
-        CRYPTO_THREAD_ID tid;
-        uint64_t time;
-    } data;
-
-    /* Erase the entire structure including any padding */
-    memset(&data, 0, sizeof(data));
-
-    /*
-     * Add some noise from the thread id and a high resolution timer.
-     * The fork_id adds some extra fork-safety.
-     * The thread id adds a little randomness if the drbg is accessed
-     * concurrently (which is the case for the <master> drbg).
-     */
-    data.fork_id = openssl_get_fork_id();
-    data.tid = CRYPTO_THREAD_get_current_id();
-    data.time = get_timer_bits();
-
-    return ossl_rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
-}
-
-
 /*
  * Get the current time with the highest possible resolution
  *
@@ -828,55 +802,5 @@ static uint64_t get_time_stamp(void)
     return time(NULL);
 }
 
-/*
- * Get an arbitrary timer value of the highest possible resolution
- *
- * The timer value is added as random noise to the additional data,
- * which is not considered a trusted entropy sourec, so any result
- * is acceptable.
- */
-static uint64_t get_timer_bits(void)
-{
-    uint64_t res = OPENSSL_rdtsc();
-
-    if (res != 0)
-        return res;
-
-# if defined(__sun) || defined(__hpux)
-    return gethrtime();
-# elif defined(_AIX)
-    {
-        timebasestruct_t t;
-
-        read_wall_time(&t, TIMEBASE_SZ);
-        return TWO32TO64(t.tb_high, t.tb_low);
-    }
-# elif defined(OSSL_POSIX_TIMER_OKAY)
-    {
-        struct timespec ts;
-
-#  ifdef CLOCK_BOOTTIME
-#   define CLOCK_TYPE CLOCK_BOOTTIME
-#  elif defined(_POSIX_MONOTONIC_CLOCK)
-#   define CLOCK_TYPE CLOCK_MONOTONIC
-#  else
-#   define CLOCK_TYPE CLOCK_REALTIME
-#  endif
-
-        if (clock_gettime(CLOCK_TYPE, &ts) == 0)
-            return TWO32TO64(ts.tv_sec, ts.tv_nsec);
-    }
-# endif
-# if defined(__unix__) \
-     || (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L)
-    {
-        struct timeval tv;
-
-        if (gettimeofday(&tv, NULL) == 0)
-            return TWO32TO64(tv.tv_sec, tv.tv_usec);
-    }
-# endif
-    return time(NULL);
-}
 #endif /* (defined(OPENSSL_SYS_UNIX) && !defined(OPENSSL_SYS_VXWORKS))
           || defined(__DJGPP__) */

providers/implementations/rands/seeding/rand_vms.c

@@ -575,32 +575,6 @@ size_t ossl_pool_acquire_entropy(RAND_POOL *pool)
     return data_collect_method(pool);
 }
 
-
-int ossl_rand_pool_add_additional_data(RAND_POOL *pool)
-{
-    struct {
-        CRYPTO_THREAD_ID tid;
-        unsigned __int64 time;
-    } data;
-
-    /* Erase the entire structure including any padding */
-    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();
-#if __CRTL_VER >= 80400000
-    sys$gettim_prec(&data.time);
-#else
-    sys$gettim((void*)&data.time);
-#endif
-
-    return ossl_rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
-}
-
 int ossl_rand_pool_init(void)
 {
     return 1;

providers/implementations/rands/seeding/rand_vxworks.c

@@ -76,26 +76,6 @@ void ossl_rand_pool_keep_random_devices_open(int keep)
 {
 }
 
-int ossl_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 ossl_rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
-}
-
 int ossl_pool_add_nonce_data(RAND_POOL *pool)
 {
     struct {

providers/implementations/rands/seeding/rand_win.c

@@ -147,26 +147,6 @@ int ossl_pool_add_nonce_data(RAND_POOL *pool)
     return ossl_rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
 }
 
-int ossl_rand_pool_add_additional_data(RAND_POOL *pool)
-{
-    struct {
-        DWORD tid;
-        LARGE_INTEGER time;
-    } data;
-
-    /* Erase the entire structure including any padding */
-    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 = GetCurrentThreadId();
-    QueryPerformanceCounter(&data.time);
-    return ossl_rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
-}
-
 int ossl_rand_pool_init(void)
 {
     return 1;